XEL


Line plots across dimensions of each concept
Line plots across concepts
Tables

Table of contents



us-gaap:CommonStockValue

us-gaap:CommonStockSharesOutstanding
us-gaap:StatementEquityComponents

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:CostsAndExpenses

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeTaxExpenseBenefit
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:IncomeTaxesPaidNet

us-gaap:InterestAndDebtExpense

us-gaap:InterestExpense

us-gaap:InterestPaidNet

us-gaap:NetIncomeLoss
us-gaap:StatementBusinessSegments
us-gaap:StatementEquityComponents

us-gaap:OperatingIncomeLoss
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:RegulatedAndUnregulatedOperatingRevenue
us-gaap:ConsolidationItems
us-gaap:MajorCustomers, us-gaap:ProductOrService
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:MajorCustomers, us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems
us-gaap:Revenues
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:UnregulatedOperatingRevenue
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:Assets
us-gaap:ConsolidatedEntities

us-gaap:LiabilitiesAndStockholdersEquity
us-gaap:ConsolidatedEntities

us-gaap:StockholdersEquity
us-gaap:ConsolidatedEntities
us-gaap:StatementEquityComponents

us-gaap:AssetsCurrent
us-gaap:ConsolidatedEntities

us-gaap:CashAndCashEquivalentsAtCarryingValue
us-gaap:ConsolidatedEntities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
us-gaap:ConsolidatedEntities

us-gaap:AccountsReceivableNetCurrent

us-gaap:InventoryNet
us-gaap:ConsolidatedEntities
us-gaap:OtherAssetsCurrent

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OtherAssetsNoncurrent
us-gaap:ConsolidatedEntities

us-gaap:AccountsPayableCurrent

us-gaap:DividendsPayableCurrent
us-gaap:ConsolidatedEntities

us-gaap:LiabilitiesCurrent
us-gaap:ConsolidatedEntities
dei:LegalEntity
us-gaap:LongTermDebtCurrent
us-gaap:ConsolidatedEntities

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OtherLiabilitiesCurrent
us-gaap:ConsolidatedEntities

us-gaap:TaxesPayableCurrent

us-gaap:LongTermDebt
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:LongTermDebtNoncurrent

us-gaap:DeferredFinanceCostsNoncurrentNet

us-gaap:LongTermDebtAndCapitalLeaseObligations

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
us-gaap:RetirementPlanType

us-gaap:OtherLiabilitiesNoncurrent
us-gaap:ConsolidatedEntities

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:OperatingLeaseLiability
us-gaap:IncomeTaxAuthority
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:StockholdersEquity
us-gaap:ConsolidatedEntities
us-gaap:StatementEquityComponents

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:StockIssuedDuringPeriodValueNewIssues
us-gaap:StatementEquityComponents

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:IncreaseDecreaseInAccountsPayable

us-gaap:IncreaseDecreaseInInventories

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:StatementBusinessSegments
us-gaap:StatementEquityComponents

us-gaap:ShareBasedCompensation

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquireProductiveAssets

us-gaap:PaymentsToAcquireInvestments

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:ProceedsFromIssuanceOfLongTermDebt

us-gaap:RepaymentsOfLongTermDebt

us-gaap:PaymentsOfDividends

us-gaap:EffectiveIncomeTaxRateContinuingOperations
us-gaap:IncomeTaxAuthority
us-gaap:DeferredTaxLiabilities

us-gaap:UnrecognizedTaxBenefits

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:ProceedsFromRepaymentsOfShortTermDebt

us-gaap:AllowanceForFundsUsedDuringConstructionInvestingActivities

us-gaap:CapitalExpendituresIncurredButNotYetPaid

us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:DebtRelatedCommitmentFeesAndDebtIssuanceCosts
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanInterestCost
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanServiceCost

us-gaap:DepreciationAmortizationAndAccretionNet
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeGainLossOnDerivativeNet
us-gaap:HedgingDesignation
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation
us-gaap:DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation

us-gaap:DividendsCommonStock
us-gaap:StatementEquityComponents

us-gaap:EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate

us-gaap:EffectiveIncomeTaxRateReconciliationOtherAdjustments

us-gaap:EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent

us-gaap:EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes

us-gaap:EffectiveIncomeTaxRateReconciliationTaxCredits

us-gaap:EquityMethodInvestmentDividendsOrDistributions
us-gaap:DerivativeInstrumentRisk
us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings
us-gaap:DerivativeInstrumentRisk
us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchases
us-gaap:DerivativeInstrumentRisk
us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements

us-gaap:FinanceLeaseInterestExpense

us-gaap:FinanceLeaseRightOfUseAssetAmortization

us-gaap:GainLossRelatedToLitigationSettlement
dei:LegalEntity

us-gaap:IncomeLossFromEquityMethodInvestments

us-gaap:IncreaseDecreaseInAccountsAndOtherReceivables

us-gaap:IncreaseDecreaseInEmployeeRelatedLiabilities

us-gaap:IncreaseDecreaseInOtherCurrentAssets

us-gaap:IncreaseDecreaseInOtherCurrentLiabilities

us-gaap:IncreaseDecreaseInRegulatoryAssetsAndLiabilities

us-gaap:IncrementalCommonSharesAttributableToContingentlyIssuableShares
us-gaap:ConsolidatedEntities
us-gaap:LineOfCreditFacilityInterestRateDuringPeriod
us-gaap:ShortTermDebtType

us-gaap:OperatingLeaseCost
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation
us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:OtherCostOfOperatingRevenue

us-gaap:OtherOperatingActivitiesCashFlowStatement

us-gaap:PaymentsForProceedsFromOtherInvestingActivities
dei:LegalEntity, us-gaap:RetirementPlanType, us-gaap:SubsequentEventType
us-gaap:PensionContributions
us-gaap:ConsolidatedEntities, us-gaap:RetirementPlanType

us-gaap:ProceedsFromIssuanceOfCommonStock
xel:ShareIssuanceProgram

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

us-gaap:ProceedsFromSaleAndMaturityOfOtherInvestments
dei:LegalEntity, us-gaap:CounterpartyName, us-gaap:PublicUtilityRegulatedOrUnregulatedStatus
us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment

us-gaap:ProceedsFromSalesOfBusinessAffiliateAndProductiveAssets

us-gaap:PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity
us-gaap:DerivativeInstrumentRisk, us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
us-gaap:StatementEquityComponents
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAociCurrentPeriodTax

us-gaap:RegulatedOperatingRevenueGas
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ProductOrService
us-gaap:RevenueNotFromContractWithCustomer
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability

us-gaap:ShortTermLeaseCost
us-gaap:ShortTermDebtType
us-gaap:ShorttermDebtAverageOutstandingAmount
us-gaap:ShortTermDebtType
us-gaap:ShorttermDebtMaximumAmountOutstandingDuringPeriod

us-gaap:StockIssued1
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesNewIssues
us-gaap:StatementEquityComponents
us-gaap:StockRepurchasedDuringPeriodShares

us-gaap:StockRepurchasedDuringPeriodValue
us-gaap:StatementEquityComponents

us-gaap:TaxesOther

us-gaap:UnrealizedGainOnSecurities

us-gaap:UnrealizedLossOnSecurities

us-gaap:UtilitiesOperatingExpenseDepreciationAndAmortization

us-gaap:UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses
dei:LegalEntity, us-gaap:PublicUtilitiesRegulatoryProceeding, us-gaap:RegulatoryAgency
xel:BasisPointReduction

xel:ConservationandDemandSideManagementProgramExpenses

xel:CostofnaturalGasSoldandTransported

xel:CreditLossesTopic326ASCTopic326
us-gaap:StatementEquityComponents
dei:LegalEntity
xel:Customerrefundofpreviouslyrecoveredpurchasedpowercosts
dei:LegalEntity, us-gaap:SubsequentEventType
us-gaap:RetirementPlanType
xel:DefinedBenefitPlanCreditsNotRecognizedDueToEffectsofRegulation
us-gaap:RetirementPlanType
xel:DefinedBenefitPlanNetBenefitCostCreditRecognizedBeforeRegulatoryAdjustments
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
xel:DerivativeInstrumentsGainLossReclassifiedToRegulatoryAssetsAndLiabilitiesNet
us-gaap:HedgingDesignation

xel:EffectiveIncomeTaxRateReconciliationNetOperatingLossCarrybackPercent

xel:EffectiveIncomeTaxRateReconciliationOtherRegulatoryItemsPercent

xel:ElectricFuelandPurchasedPower
us-gaap:DerivativeInstrumentRisk
xel:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityNetLossesGainsRecognizedAsRegulatoryAssetsAndLiabilities

xel:FinanceLeaseCost

xel:IncreaseDecreaseinAccruedUnbilledRevenues

xel:Inventorytransferstoplantpropertyandequipment
dei:LegalEntity, us-gaap:PublicUtilityRegulatedOrUnregulatedStatus
xel:NaturalGasCombineCycleFacilityOutput

xel:NuclearFuelAmortization
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
xel:Pretaxgainslossesreclassifiedintoincomeduringtheperiodfromregulatoryassetsandliabilities
us-gaap:HedgingDesignation

xel:ProvisionForBadDebts

xel:PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfDebt
dei:LegalEntity, us-gaap:PublicUtilitiesRegulatoryProceeding, us-gaap:RegulatoryAgency
xel:PublicUtilitiesROENewBaseComplaintNumber1
dei:LegalEntity, us-gaap:PublicUtilitiesRegulatoryProceeding, us-gaap:RegulatoryAgency
xel:PublicUtilitiesROEdevelopedwithnewapproach

xel:RegulatedOperatingRevenueElectric
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments
xel:RevenuesIncludingIntersegmentRevenues
us-gaap:ConsolidatedEntities
xel:UtilityMoneyPoolArrangementAverageLoanOutstanding
us-gaap:ConsolidatedEntities
xel:UtilityMoneyPoolArrangementMaximumLoanOutstanding

dei:EntityCommonStockSharesOutstanding

us-gaap:AccountsReceivableGrossCurrent
dei:LegalEntity, us-gaap:EnvironmentalRemediationSite
us-gaap:AccrualForEnvironmentalLossContingenciesGross

us-gaap:AccumulatedDeferredInvestmentTaxCredit

us-gaap:AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:AlternativeInvestment
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType

us-gaap:AssetRetirementObligation
dei:LegalEntity, xel:AssetRetirementObligationsByClassOfProperty
xel:AssetRetirementObligationsByClassOfProperty

us-gaap:AssetRetirementObligationsNoncurrent
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType
us-gaap:AssetsFairValueDisclosure
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:AvailableForSaleSecurities

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesDebtSecurities
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:AvailableForSaleSecuritiesEquitySecurities
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:ConsolidatedEntities
us-gaap:CapitalizationLongtermDebtAndEquity
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:CashAndCashEquivalentsFairValueDisclosure
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:ContractWithCustomerLiabilityNoncurrent

us-gaap:DebtInstrumentCarryingAmount
dei:LegalEntity
us-gaap:DebtInstrumentUnamortizedDiscountPremiumNet
dei:LegalEntity, us-gaap:CreditFacility
us-gaap:DebtLongtermAndShorttermCombinedAmount
us-gaap:ConsolidatedEntities, us-gaap:CreditFacility
us-gaap:CreditFacility
dei:LegalEntity, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType
us-gaap:DecommissioningTrustAssetsAmount
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType

us-gaap:DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
us-gaap:IncomeTaxAuthority
us-gaap:DeferredTaxAssetsOther
us-gaap:IncomeTaxAuthority
us-gaap:DeferredTaxAssetsTaxDeferredExpense
us-gaap:IncomeTaxAuthority
us-gaap:DeferredTaxAssetsTaxDeferredExpenseOther
us-gaap:IncomeTaxAuthority
us-gaap:DeferredTaxLiabilitiesTaxDeferredIncome
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmountsRecognizedInBalanceSheet
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanBenefitObligation
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanFundedStatusOfPlan
us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanPlanAssetsTargetAllocationPercentage
us-gaap:RetirementPlanType
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanUltimateHealthCareCostTrendRate1

us-gaap:DerivativeAssetCollateralObligationToReturnCashOffset
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency, us-gaap:HedgingDesignation
us-gaap:DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset
us-gaap:BalanceSheetLocation, us-gaap:FairValueByMeasurementFrequency
us-gaap:BalanceSheetLocation
us-gaap:DerivativeAssets
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency, us-gaap:HedgingDesignation
us-gaap:BalanceSheetLocation, us-gaap:FairValueByMeasurementFrequency

us-gaap:DerivativeInstrumentsAndHedges

us-gaap:DerivativeInstrumentsAndHedgesLiabilities

us-gaap:DerivativeInstrumentsAndHedgesLiabilitiesNoncurrent

us-gaap:DerivativeInstrumentsAndHedgesNoncurrent
us-gaap:BalanceSheetLocation
us-gaap:DerivativeLiabilities
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency, us-gaap:HedgingDesignation
us-gaap:BalanceSheetLocation, us-gaap:FairValueByMeasurementFrequency

us-gaap:DerivativeLiabilityCollateralRightToReclaimCashOffset
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency, us-gaap:HedgingDesignation
us-gaap:DerivativeLiabilityFairValueGrossAssetAndRightToReclaimCashOffset
us-gaap:BalanceSheetLocation, us-gaap:FairValueByMeasurementFrequency
us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeNonmonetaryNotionalAmount
us-gaap:ConsolidatedEntities
us-gaap:DueFromRelatedPartiesCurrent
us-gaap:ConsolidatedEntities, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
dei:LegalEntity
us-gaap:EquityMethodInvestmentOwnershipPercentage

us-gaap:EquityMethodInvestments
us-gaap:ConsolidatedEntities
us-gaap:StatementBusinessSegments
us-gaap:DerivativeInstrumentRisk
us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs

us-gaap:FinanceLeaseLiability

us-gaap:FinanceLeaseLiabilityCurrent

us-gaap:FinanceLeaseLiabilityNoncurrent

us-gaap:FinanceLeaseLiabilityPaymentsDue

us-gaap:FinanceLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:FinanceLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFive

us-gaap:FinanceLeaseLiabilityPaymentsDueYearFour

us-gaap:FinanceLeaseLiabilityPaymentsDueYearThree

us-gaap:FinanceLeaseLiabilityPaymentsDueYearTwo

us-gaap:FinanceLeaseLiabilityUndiscountedExcessAmount

us-gaap:FinanceLeaseRightOfUseAsset

us-gaap:GuaranteeObligationsMaximumExposure
us-gaap:GuaranteeObligationsByNature, us-gaap:UnderlyingAssetClass

us-gaap:InterestPayableCurrent
us-gaap:DerivativeInstrumentRisk
us-gaap:InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet

us-gaap:InvestmentsAndOtherNoncurrentAssets
dei:LegalEntity
us-gaap:JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInService
dei:LegalEntity, us-gaap:JointlyOwnedUtilityPlant, xel:JointlyOwnedUtilityPlantName
dei:LegalEntity
us-gaap:JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress
dei:LegalEntity, us-gaap:JointlyOwnedUtilityPlant, xel:JointlyOwnedUtilityPlantName
dei:LegalEntity
us-gaap:JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciation
dei:LegalEntity, us-gaap:JointlyOwnedUtilityPlant, xel:JointlyOwnedUtilityPlantName
dei:LegalEntity, us-gaap:JointlyOwnedUtilityPlant, xel:JointlyOwnedUtilityPlantName
us-gaap:JointlyOwnedUtilityPlantProportionateOwnershipShare

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:LiabilitiesOtherThanLongtermDebtNoncurrent
us-gaap:ConsolidatedEntities

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity
dei:LegalEntity, us-gaap:CreditFacility
us-gaap:ConsolidatedEntities, us-gaap:CreditFacility
us-gaap:ConsolidatedEntities, us-gaap:DebtInstrument, us-gaap:ShortTermDebtType
us-gaap:CreditFacility
us-gaap:ShortTermDebtType
dei:LegalEntity, us-gaap:CreditFacility
us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity
dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:ShortTermDebtType
us-gaap:ConsolidatedEntities, us-gaap:CreditFacility
us-gaap:CreditFacility

us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent

us-gaap:LongTermDebtFairValue
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
dei:LegalEntity, us-gaap:Range, us-gaap:LossContingenciesByNatureOfContingency
us-gaap:LossContingencyEstimateOfPossibleLoss
us-gaap:LossContingenciesByNatureOfContingency
us-gaap:LossContingencyPendingClaimsNumber

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent
us-gaap:IncomeTaxAuthority
us-gaap:OperatingLossCarryforwards

us-gaap:OtherLongTermInvestments
us-gaap:RetirementPlanType
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities

us-gaap:PrepaidTaxes
us-gaap:RetirementPlanType
us-gaap:PrescriptionDrugSubsidyReceiptsAfterYearFive
us-gaap:RetirementPlanType
us-gaap:PrescriptionDrugSubsidyReceiptsNextTwelveMonths
us-gaap:RetirementPlanType
us-gaap:PrescriptionDrugSubsidyReceiptsYearFive1
us-gaap:RetirementPlanType
us-gaap:PrescriptionDrugSubsidyReceiptsYearFour1
us-gaap:RetirementPlanType
us-gaap:PrescriptionDrugSubsidyReceiptsYearThree1
us-gaap:RetirementPlanType
us-gaap:PrescriptionDrugSubsidyReceiptsYearTwo1

us-gaap:PublicUtilitiesInventory
us-gaap:PublicUtilitiesInventory
us-gaap:IncomeTaxAuthority
us-gaap:RegulatoryAssets

us-gaap:RegulatoryAssetsCurrent
us-gaap:RegulatoryAsset

us-gaap:RegulatoryAssetsNoncurrent
us-gaap:RegulatoryAsset
us-gaap:IncomeTaxAuthority
us-gaap:RegulatoryLiabilities

us-gaap:RegulatoryLiabilityCurrent
us-gaap:RegulatoryAsset
us-gaap:RegulatoryLiability

us-gaap:RegulatoryLiabilityNoncurrent
us-gaap:RegulatoryAsset
us-gaap:RegulatoryLiability
us-gaap:ConsolidatedEntities
us-gaap:RelatedPartyTransactionDueFromToRelatedPartyCurrent

us-gaap:RemainingAmountsOfRegulatoryAssetsForWhichNoReturnOnInvestmentDuringRecoveryPeriodIsProvided

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
us-gaap:AwardType

us-gaap:ShortTermBorrowings
dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:ShortTermDebtType
us-gaap:ConsolidatedEntities, us-gaap:DebtInstrument, us-gaap:ShortTermDebtType
us-gaap:ShortTermDebtType
us-gaap:ConsolidatedEntities
us-gaap:ShortTermDebtWeightedAverageInterestRate
us-gaap:ShortTermDebtType

us-gaap:TaxCreditCarryforwardAmount
us-gaap:IncomeTaxAuthority
us-gaap:IncomeTaxAuthority
us-gaap:TaxCreditCarryforwardValuationAllowance
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:InvestmentType
us-gaap:TradingSecurities
us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:InvestmentType
dei:LegalEntity
us-gaap:UnamortizedDebtIssuanceExpense

us-gaap:UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
us-gaap:LongTermContractForPurchaseOfElectricPower
us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary
us-gaap:UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchased
us-gaap:LongTermContractForPurchaseOfElectricPower
us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary
us-gaap:UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchased
us-gaap:LongTermContractForPurchaseOfElectricPower
us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary
us-gaap:UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchased
us-gaap:LongTermContractForPurchaseOfElectricPower
us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary
us-gaap:UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchased
us-gaap:LongTermContractForPurchaseOfElectricPower
us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary
us-gaap:UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchased
us-gaap:LongTermContractForPurchaseOfElectricPower
us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
us-gaap:UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchased
us-gaap:LongTermContractForPurchaseOfElectricPower
us-gaap:UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears
us-gaap:UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchased
us-gaap:ValuationAllowancesAndReservesType
us-gaap:ValuationAllowancesAndReservesBalance
dei:LegalEntity, xel:AssetRetirementObligationsByClassOfProperty
xel:ARODifferencesBetween2020And2014CostStudies

xel:AccruedUnbilledRevenues
dei:LegalEntity
xel:AmountMPUCPreviouslyDisallowedRelatedToShercoOutage
us-gaap:SubsequentEventType
us-gaap:RetirementPlanType
xel:AmountsNotYetRecognizedAsComponentsOfNetPeriodicBenefitCostRecordedAsCurrentRegulatoryAssets
us-gaap:RetirementPlanType
xel:AmountsNotYetRecognizedAsComponentsOfNetPeriodicBenefitCostRecordedAsDeferredIncomeTaxes
us-gaap:RetirementPlanType
xel:AmountsNotYetRecognizedAsComponentsOfNetPeriodicBenefitCostRecordedAsNetOfTaxAccumulatedOtherComprehensiveIncome
us-gaap:RetirementPlanType
xel:AmountsNotYetRecognizedAsComponentsOfNetPeriodicBenefitCostRecordedAsNoncurrentRegulatoryAssets
us-gaap:RetirementPlanType
xel:AmountsNotYetRecognizedAsComponentsOfNetPeriodicBenefitCostRecordedAsNoncurrentRegulatoryLiabilities
us-gaap:RetirementPlanType
xel:AmountsNotYetRecognizedAsComponentsOfNetPeriodicBenefitCostTotal
dei:LegalEntity, us-gaap:Range, us-gaap:LossContingenciesByNatureOfContingency
xel:BusinessInterruptionInsuranceCoverageProvidedByNEIL
dei:LegalEntity
xel:CapitalizationShortTermDebtLongTermDebtAndEquity
dei:LegalEntity, xel:EnvironmentalRegulation
xel:CostOfConstructionOfANewImpoundment
dei:LegalEntity, us-gaap:EnvironmentalRemediationSite
xel:CurrentCostEstimateforSiteRemediation
us-gaap:IncomeTaxAuthority
xel:DeferredTaxAssetsRateRefund

xel:DeferredTaxAssetsTaxDeferredBenefit
us-gaap:IncomeTaxAuthority
xel:DeferredTaxLiabilityPensionExpense
us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:RetirementPlanType
xel:DefinedBenefitPlanAlternativeInvestmentsFairValueOfPlanAssets
us-gaap:RetirementPlanType
us-gaap:RetirementPlanType
xel:DefinedBenefitPlanNetProjectedBenefitPaymentsInFiveFiscalYearsThereafter
us-gaap:RetirementPlanType
xel:DefinedBenefitPlanNetProjectedBenefitPaymentsInYearFive
us-gaap:RetirementPlanType
xel:DefinedBenefitPlanNetProjectedBenefitPaymentsInYearFour
us-gaap:RetirementPlanType
xel:DefinedBenefitPlanNetProjectedBenefitPaymentsInYearOne
us-gaap:RetirementPlanType
xel:DefinedBenefitPlanNetProjectedBenefitPaymentsInYearThree
us-gaap:RetirementPlanType
xel:DefinedBenefitPlanNetProjectedBenefitPaymentsInYearTwo

xel:DerivativeGrossLiabilityPositionAggregateFairValue

xel:DerivativeGrossLiabilityWithCrossDefaultPositionAggregateFairValue
dei:LegalEntity, xel:AssetRetirementObligationsByClassOfProperty
xel:DifferencesinDiscountRateandMarketRiskPremium
dei:LegalEntity, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType
xel:DiscountedDecommissioningCostObligation
dei:LegalEntity, xel:AssetRetirementObligationsByClassOfProperty
dei:LegalEntity, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType
xel:DiscountedDecommissioningObligationComparedToAssetsCurrentlyHeldInTrust
dei:LegalEntity, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType
xel:EffectOfDiscountingObligationUsingRiskFreeInterestRate
dei:LegalEntity, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType
xel:EffectOfEscalatingCostsToCurrentYearDollars
dei:LegalEntity, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType
xel:EffectOfEscalatingCostsToPaymentDate
us-gaap:BalanceSheetLocation
xel:EntitysRecordedProvisionforRevenueSubjectToRefund
dei:LegalEntity
xel:EquityToTotalCapitalizationRatioExcludingShort-TermDebt
dei:LegalEntity
xel:EquityToTotalCapitalizationRatioExcludingShort-TermDebtHighEndOfRange
dei:LegalEntity
xel:EquityToTotalCapitalizationRatioExcludingShort-TermDebtLowEndOfRange
dei:LegalEntity
xel:EquityToTotalCapitalizationRatioHighEndOfRange
dei:LegalEntity
xel:EquityToTotalCapitalizationRatioLowEndOfRange
dei:LegalEntity
xel:Equitytototalcapitalizationratio
dei:LegalEntity, xel:EnvironmentalRegulation
xel:EstimatedCostOfConstructionOfAnAlternativeCollectionAndTreatmentSystem
dei:LegalEntity, xel:EnvironmentalRegulation
xel:EstimatedCostToCloseComancheStationBottomAshPond
dei:LegalEntity, xel:EnvironmentalRegulation
xel:EstimatedCostToRemediateGroundwaterSamplingResults
dei:LegalEntity, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType
xel:EstimatedDecommissioningCostObligationInCurrentDollars
dei:LegalEntity, xel:EnvironmentalRegulation
xel:Estimatedcostofconstructionofanewimpoundment
us-gaap:Range, xel:ShareIssuanceProgram
xel:Expectedsettlementprice
us-gaap:IncomeTaxAuthority
xel:FederalBenefit
us-gaap:IncomeTaxAuthority
xel:FederalDetriment

xel:FinanceLeaseRightofUseAssetAccumulatedDepreciation

xel:GainOnSale
dei:LegalEntity, us-gaap:PublicUtilityRegulatedOrUnregulatedStatus
us-gaap:ConsolidatedEntities
xel:GeneratingCapacityUnderLongTermPurchasedPowerAgreements
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
dei:LegalEntity, us-gaap:Range, us-gaap:LossContingenciesByNatureOfContingency
xel:InterruptionInsuranceCoverageLimitsForNuclearPlantSites
us-gaap:ConsolidatedEntities
xel:InvestmentsReceivableInUtilityMoneyPoolArrangement
us-gaap:UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchased, xel:EnvironmentalRegulation
xel:LiabilityForEstimatedCostToComplyWithRegulation
us-gaap:UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchased, xel:EnvironmentalRegulation
xel:Liabilityforestimatedcosttocomplywithentrainmentregulation
dei:LegalEntity, us-gaap:CreditFacility
xel:LineOfCreditFacilityDebtToTotalCapitalizationRatio
us-gaap:Range
xel:LongTermPurchaseCommitmentTechnologyAgreementFutureMinimumPaymentsDueCurrent
us-gaap:Range
xel:LongTermPurchaseCommitmentTechnologyAgreementFutureMinimumPaymentsDueInTwoYears
dei:LegalEntity
xel:MaximumAdditionalLongTermDebtAuthorizedForIssuance
dei:LegalEntity
xel:MaximumAdditionalShortTermDebtAuthorizedForIssuance
dei:LegalEntity, us-gaap:LossContingenciesByNatureOfContingency
xel:MaximumAssessmentForBusinessInterruptionInsurance
dei:LegalEntity, us-gaap:LossContingenciesByNatureOfContingency
xel:MaximumAssessmentForPropertyDamageInsurance
dei:LegalEntity, us-gaap:LossContingenciesByNatureOfContingency
xel:MaximumAssessmentsPerReactorPerAccident
dei:LegalEntity
xel:MaximumTotalCapitalization
dei:LegalEntity
xel:MinimumCalendarYearAverageEquityToTotalCapitalizationRatioAuthorizedByStateCommission

xel:NetDeferredTaxLiabilityassociatedwiththeUnrecognizedTaxBenefitAmountsandRelatedNOLsandTaxCreditCarryforwards
dei:LegalEntity, us-gaap:LossContingenciesByNatureOfContingency
xel:NuclearInsuranceCoverageExposureFundedBySecondaryFinancialProtectionProgram
dei:LegalEntity, us-gaap:LossContingenciesByNatureOfContingency
xel:NuclearInsuranceCoverageSecuredForPublicLiabilityExposure
dei:LegalEntity, xel:EnvironmentalRegulation
xel:Numberofimpoundmentswhereclosureplanswillbeexpedited
us-gaap:IncomeTaxAuthority
xel:OperatingLeaseAssets

xel:OperatingLeaseRightofUseAssetAccumulatedDepreciation

xel:OperatingLeaseRightofUseAssetGross
us-gaap:PropertyPlantAndEquipmentByType
xel:GeneratingFacility
dei:LegalEntity, xel:AssetRetirementObligationsByClassOfProperty
xel:OperatingandMaintenanceCostsNotIncludedforGAAP

xel:OtherAssetsExcludingPropertyPlantAndEquipment
us-gaap:ConsolidatedEntities
us-gaap:IncomeTaxAuthority
xel:OtherEmployeeBenefits

xel:PayableForInterestRelatedToUnrecognizedTaxBenefits
us-gaap:ConcentrationRiskByType, xel:CreditQualityIndicator
xel:PercentageOfWholesaleTradingAndNonTradingCommodityCreditExposureForMostSignificantCounterparties

xel:RecoverabilityOfCostsInExcessOfForecastedAmountHighEnd

xel:RecoverabilityOfCostsInExcessOfForecastedAmountLowEnd

xel:TaxBenefitsAssociatedWithNolAndTaxCreditCarryforwards

xel:UnrecognizedTaxBenefitsThatWouldNotImpactEffectiveTaxRate
dei:LegalEntity
xel:UnrestrictedRetainedEarningsPerStateRegulatoryCommissionsDividendRestrictions

xel:ValuationAllowancesForStateCreditCarryforwardsNetOfFederalBenefit
us-gaap:ConsolidatedEntities
xel:VariableInterestEntityConsolidatedCarryingAmountMortgagesOtherLongTermDebtPayable
us-gaap:ConsolidatedEntities
xel:VariableInterestEntityConsolidatedCarryingAmountOtherNoncurrentLiabilities
us-gaap:ConsolidatedEntities
xel:VariableInterestEntityConsolidatedCarryingAmountPropertyPlantEquipmentNet
us-gaap:ConcentrationRiskByType, xel:CreditQualityIndicator
xel:WholesaleTradingAndNonTradingCommodityCreditExposureForMostSignificantCounterparties
dei:LegalEntity
xel:WindOperatingCommitmentsMinimumNetCapacityFactor

Plots across concepts


Expenses
Income Tax Expense Benefit
Balance Sheet
Cash And Cash Equivalents At Carrying Value
Assets
Inventory Net
Current Assets
Prepaid Expense And Other Assets Current
NonCurrent Assets
Other Assets Noncurrent
PropertyPlantAndEquipmentNet
Accumulated Depreciation Depletion And Amortization Property Plant And Equipment
Liabilities
Operating Lease Liability
Current Liabilities
Operating Lease Liability Current
Noncurrent Liabilities
Other Liabilities Noncurrent
Stockholders Equity
Accumulated Other Comprehensive Income Loss Net Of Tax
Per Share
Common Stock Dividends Per Share Declared
CashFlow
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInOperatingActivities
Increase Decrease In Accounts Payable
NetCashProvidedByUsedInInvestingActivities
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInFinancingActivities
Repayments Of Long Term Debt
Shares
Common Stock Shares Outstanding
OperatingLeaseLiability
Operating Lease Liability Current
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Payments Due Year Four
AccountsReceivable
Allowance For Doubtful Accounts Receivable Current

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:CommonStockValue ███▆▆▆▆▆▅▅▅▅▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▃▃▃▃▃▂▂▂▂▂▁▁▁▁1346.01345.01344.01314.01313.01313.01311.01311.01287.01287.01285.01283.01272.01272.01269.01269.4071269.4071269.4071268.0571269.8821269.8821269.8821268.8391268.1681267.3981266.6591264.3331263.561262.7641252.8791244.9291244.0641243.2391236.8881219.8991219.0321218.2141217.3391216.2341212.3691211.3561210.4111205.834NANANA1143.773NANANA
us-gaap:CommonStockSharesOutstanding ███▄▄▄▄▁▁▁▁▁538.305927538.076662537.438394525.452824525.204978525.033594524.539514.865476514.865476514.667625514.036787513.298952NA508.661859507.762881507.762881507.762881507.762881507.222795507.952795507.952795507.952795507.535523507.267264506.959395506.66377505.733267505.424067505.105562501.151619497.971508497.625709497.295719494.755061487.959516487.612881487.285506486.935997486.493933NANANA482.33375NANANA457.509263NANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding ▄▄539.0539.0NA528.0527.0527.0NA521.0518.0516.0NA511.0510.0509.0NA509.242509.135508.774NA509.566509.49509.15NA508.427508.074507.393NA506.365503.456499.746NA498.641498.036490.531NA488.578488.017487.995NA485.894485.241484.301NA462.019460.432459.697NANANANA
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic █▁539.0538.0NA526.0527.0526.0NA519.0516.0515.0NA510.0510.0509.0NA508.581508.542508.278NA508.941508.93508.667NA508.031507.707506.983NA506.082503.272499.523NA498.149497.747489.781NA488.084487.717487.36NA485.344484.918483.641NA460.471460.041458.918NANANANA
us-gaap:EarningsPerShareBasic ▄▄▃█▃▃▃▇▃▄▂▇▃▃▂▇▃▃▃▆▂▃▂▆▂▁▂▅▂▃▁▅▂▃▁▅▂▂▁▄▂▂▁▄▁▂▂▃▁▂0.580.670.541.150.540.560.561.020.460.610.420.960.520.570.370.970.450.470.450.90.390.470.410.840.390.30.390.730.390.520.30.730.40.480.290.820.380.380.290.690.330.420.290.680.30.360.370.480.250.38
us-gaap:EarningsPerShareDiluted ▄▄▃█▃▃▃▇▃▄▂▇▃▄▂▇▃▃▃▆▂▃▂▆▂▁▂▅▂▃▁▅▂▃▁▅▂▂▁▄▂▂▁▄▁▂▂▃▁▂0.580.670.541.140.540.560.561.010.460.610.420.960.520.570.370.970.450.470.450.90.390.470.410.840.390.30.390.730.390.520.30.730.40.480.290.810.380.380.290.690.330.420.290.670.30.360.370.480.250.38
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
 TTM Greenblatt ROC _ _▃▄▃█▂▃▃▇▂▃▁▆▃▃▃█▃▃▃█▃▃▃▇▂▁▂▆▂▃▁▆▂▃▁▇▂▂▁▆▂▃▁▄▁▂▂438.0507.0426.0813.0422.0455.0450.0758.0410.0486.0339.0696.0450.0480.0426.0818.359459.692486.219465.35827.054431.581489.87441.01785.812422.845350.845391.25665.68397.208493.992325.582665.113402.236454.624316.397720.434405.69380.162344.001651.496359.442426.663322.37568.63325.304403.665353.259NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:ComprehensiveIncomeNetOfTax ▄▄▃█▃▃▃▇▃▄▂▆▃▃▂▆▂▃▂▆▂▃▂▅▂▁▂▅▂▃▁▅▂▃▁▅▁▂▁▄▁▂▁▄▁▂314.0365.0290.0605.0290.0288.0293.0520.0230.0312.0209.0494.0267.0292.0190.781494.127229.042241.05222.084459.629198.608242.457202.911428.01198.433153.517190.201369.947196.618262.676153.76366.607198.642235.603137.117390.512148.569210.413127.443308.346159.626204.815134.278313.654136.318168.2NANANANA
us-gaap:CostsAndExpenses ▆█▅▄▃▄▄▃▃▆▅▄▃▅▄▃▃▅▄▃▂▃▃▂▂▅▅▃▄▆▄▃▃▄▃▂▁▃▃▃▂▄▃▂▂▄2630.03034.02521.02369.02164.02356.02348.02255.02167.02655.02541.02352.02208.02471.02370.0232198.5382185.2362460.2032329.3012213.0932068.2682282.4032204.8112115.52092.2892611.3742537.3782204.1272287.8882708.6122405.242157.2252176.6772328.2252234.7382003.9071868.9782197.9172224.4092180.1022078.782389.8772244.5642060.1571982.462403.797NANANANA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest ▂▃▂▇▂▂▂▇▂▃▁▆▃▃▂█▃▃▃█▂▃▃█▂▁▂▆▂▄▁▆▂▃▁▇▂▂▁▆▂▃▁▅▁273.0340.0258.0646.0274.0289.0299.0599.0262.0340.0208.0564.0319.0350.0307.482696.932329.645355.941337.235696.207301.192369.962319.254665.492306.812235.646284.156564.551299.422396.992223.528557.885295.775355.022210.25600.992284.876259.284219.419531.599243.204315.468208.174478.688212.491NANANANANA
us-gaap:IncomeTaxExpenseBenefit ▁▁▁▃▂▂▂▄▃▃▂▄▃▃▅▇▅▅▅█▅▅▅█▅▄▄▇▅▅▄▇▄▅▄▇▅▄▄▇▄▅▄▆▄▅-38.0-22.0-30.043.0-13.0-6.07.072.024.025.0-6.073.054.059.0118.156204.791102.389116.664109.758238.412104.397128.65110.229239.029109.88183.5887.817195.969104.258135.77173.3193.34998.893118.43470.042202.845101.80175.51578.478193.30484.533112.00171.671166.276.866121.898NANANANA
 us-gaap:IncomeTaxExpenseBenefit us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome,us-gaap:StatementEquityComponents us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome,us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges▁▄▄▁▄▁▁▁▁▁█▁▁0.01.01.00.01.00.00.00.00.00.02.00.00.0NA-0.368-0.587-0.511-0.534-0.556-0.588-0.594-0.604-0.6-0.446-0.382-0.382-0.378-0.393-0.365-0.358-0.396-0.266-0.451-1.429NANANANANANANANANANANANANANANANA
us-gaap:IncomeTaxesPaidNet ▆▆▆▅▅▆▁▆█▆▄▆-2.0-3.05.0-7.0-10.00.0-106.0-1.054.00.0-31.01.0NANA-1.949-45.9043.8530.0-0.6880.1-53.931-7.414-0.6550.9664.099-62.697-0.4080.2464.540.164-0.337-3.174.258-17.9393.3130.3824.7021.173-2.1971.4264.058-59.051-34.0459.5797.4380.393NANANANA
us-gaap:InterestAndDebtExpense █▇▇█▇▆▆▆▅▅▄▄▄▄▃▃▃▄▃▄▃▃▃▂▂▂▂▁▁▁▁▂▂▁▁▂▂▂▂▂▂▂▂▂▁▂206.0200.0203.0210.0196.0189.0185.0192.0179.0179.0164.0164.0164.0160.0155.427157.079156.582158.912154.805158.325156.296150.453146.646145.535138.057138.796136.102133.271129.287129.546133.272135.381136.512130.855133.526143.28144.238145.223145.789141.71138.5136.918139.122138.526134.88136.093NANANANA
us-gaap:InterestExpense ▇▇▇█▇▆▆▆▅▅▄▄▄▄▃▃▃▃▃▃▃▂▂▂▁▁▁▁▁▁▁▁▂▁▁▂▂▂▂▂▂▁▂▁▁▁212.0205.0212.0221.0208.0199.0195.0199.0189.0189.0177.0177.0175.0171.0165.068167.803164.195165.934161.627165.857162.98156.443153.554152.566144.222144.94144.895143.219139.4139.094144.0144.758146.828139.613144.112153.719151.921151.83152.395148.011146.338144.354147.157144.849141.455143.83NANANANA
us-gaap:InterestPaidNet ████████████▇█▇█▇█▇█▇█▇█▇█▇█▇█▇█▇█▇█▇█▇█▇█▁▇▇▇184.0206.0176.0218.0157.0207.0154.0200.0154.0190.0142.0178.0132.0181.0127.426187.224126.969174.381130.694167.348129.443164.511117.982158.038105.123161.717105.416155.72598.939152.522103.781153.006104.626153.498127.221155.03124.991156.275126.037138.552116.086150.473-919.791135.606121.535132.578NANANANA
us-gaap:NetIncomeLoss ▄▄▃█▃▃▃▇▃▄▂▆▃▃▂▆▂▃▂▆▂▃▂▅▂▁▂▄▂▃▁▄▂▃▁▅▂▂▁▄▁▂▁▄▁▁311.0362.0288.0603.0287.0295.0292.0527.0238.0315.0214.0491.0265.0291.0189.0492.141227.256239.277227.477457.795196.795241.312209.025426.463196.931152.066196.339368.582195.164261.221150.055364.752196.857236.57140.17398.106183.06183.893140.509338.332158.762203.569136.634312.306139.776167.118NANANANA
us-gaap:OperatingIncomeLoss ▃▄▃█▃▃▃▇▃▄▂▆▃▄▃█▃▄▃█▃▄▃▇▃▂▂▆▃▄▂▆▃▃▁▇▃▂▂▆▂▃▂▅▂▃▂▃▁▂438.0507.0426.0813.0422.0455.0450.0758.0410.0486.0339.0696.0450.0480.0426.0818.359459.692486.219465.35827.054431.581489.87441.01785.812422.845350.845391.25665.68397.208493.992325.582665.113402.236454.624316.397720.434405.69380.162344.001651.496359.442426.663322.37568.63325.304403.665353.259465.148279.368370.797
 us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents us-gaap:AccumulatedDefinedBenefitPlansAdjustment1.0NA1.01.02.01.0-2.01.01.03.0-1.02.01.00.0011.1140.9820.9560.948-6.2660.8780.8650.211-7.0230.8840.8830.876-6.5970.8470.8640.8643.0391.1791.135-0.639NANANANANANANANANANANANANANANANA
 us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges▇█▇▇▇▂█▂▁▃▄▇▇▆▆▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▆2.03.01.01.01.0-8.03.0-8.0-9.0-6.0-4.01.01.00.00.3421.0040.8290.8250.8730.9560.9480.9340.910.6640.6180.5740.4660.5160.590.5530.5690.5610.65-0.292NANANANANANANANANANANANANANANANA
 us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents us-gaap:AccumulatedOtherComprehensiveIncome▄▄3.03.0NA2.03.0-7.01.0-7.0-8.0-3.0-5.03.02.00.0011.4551.9861.7861.773-5.3931.8341.8131.145-6.1141.5471.502NANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherNonoperatingIncomeExpense ▄▄▃▃▄▁▃▄▃▄▂▂▃▃▅▄▃▄▃▃▃▄▃▃▃▄▃▃▃▄▃▃▃▄▃▃▃▄▃▃▃▄▃█▃▃3.05.00.01.05.0-11.02.08.02.04.0-6.0-7.0-2.01.08.8575.0892.6086.4461.5620.5781.564.25-0.3481.6260.9613.1610.6091.4040.0823.201-0.959-0.4040.4133.9221.2220.4880.7283.7370.962.550.9794.7661.00927.451.7090.975NANANANA
us-gaap:RegulatedAndUnregulatedOperatingRevenue ▆█▅▆▄▅▅▆▄▆▅▆▄▅▅▆▃▅▅▆▃▄▄▅▃▅▅▅▄▆▄▅▄▅▃▄▂▄▄▅▃▅▄▄▂▅▄▂▁▄3068.03541.02947.03182.02586.02811.02798.03013.02577.03141.02880.03048.02658.02951.02796.03016.8972540.02804.02794.6513040.1472499.8492772.2732645.8212901.3122515.1342962.2192928.6282869.8072685.0963202.6042730.8222822.3382578.9132782.8492551.1352724.3412274.6682578.0792568.412831.5982438.2222816.542566.9342628.7872307.7642807.4622618.1162314.5622016.0832695.542
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:MajorCustomers,us-gaap:ProductOrService xel:CommercialandIndustrialCustomers,xel:RetailDistribution▇▃▄▆▁▃▄▇▄▇▅█▄▅1414.01229.01276.01401.01154.01255.01292.01447.01297.01404.01333.01471.01293.01326.0NA1510.01332.01352.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:MajorCustomers,us-gaap:ProductOrService xel:OtherCustomers,xel:RetailDistribution▆▃▄█▃▁▄█▃▄▆█▇▆34.032.033.036.032.030.033.036.032.033.034.036.035.034.0NA37.034.033.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:MajorCustomers,us-gaap:ProductOrService xel:ResidentialCustomers,xel:RetailDistribution▅▆▅▆▂▅▄▄▁█▄▄▁▆1024.01127.01048.01097.0895.01042.0999.0999.0816.01231.0999.01016.0844.01086.0NA959.0826.01067.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:MajorCustomers,us-gaap:ProductOrService,us-gaap:StatementBusinessSegments xel:CommercialandIndustrialCustomers,xel:RetailDistribution,us-gaap:AllOtherSegments▃█▄▁▃█▆▃▃█▆▁▁▄6.09.07.05.06.09.08.06.06.09.08.05.05.07.0NA6.04.09.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:MajorCustomers,us-gaap:ProductOrService,us-gaap:StatementBusinessSegments xel:CommercialandIndustrialCustomers,xel:RetailDistribution,xel:RegulatedElectric▆▁▃▇▂▂▃█▄▃▃█▄▂1282.01033.01115.01340.01075.01066.01120.01383.01201.01140.01148.01408.01206.01112.0NA1445.01243.01148.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:MajorCustomers,us-gaap:ProductOrService,us-gaap:StatementBusinessSegments xel:CommercialandIndustrialCustomers,xel:RetailDistribution,xel:RegulatedNaturalGas▃▆▄▁▂▅▅▁▂█▅▁▂▆126.0187.0154.056.073.0180.0164.058.090.0255.0177.058.082.0207.0NA59.085.0195.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:MajorCustomers,us-gaap:ProductOrService,us-gaap:StatementBusinessSegments xel:OtherCustomers,xel:RetailDistribution,us-gaap:AllOtherSegments████▁▁▁▁▁▁▁▁█▁2.02.02.02.01.01.01.01.01.01.01.01.02.01.0NA1.01.01.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:MajorCustomers,us-gaap:ProductOrService,us-gaap:StatementBusinessSegments xel:OtherCustomers,xel:RetailDistribution,xel:RegulatedElectric▄▂▃▇▃▁▄█▃▄▆█▆▆32.030.031.034.031.029.032.035.031.032.033.035.033.033.0NA36.033.032.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:MajorCustomers,us-gaap:ProductOrService,us-gaap:StatementBusinessSegments xel:ResidentialCustomers,xel:RetailDistribution,us-gaap:AllOtherSegments▆▃▃▆▃▆█▃▃▁▃▃▁▁11.010.010.011.010.011.012.010.010.09.010.010.09.09.0NA10.09.08.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:MajorCustomers,us-gaap:ProductOrService,us-gaap:StatementBusinessSegments xel:ResidentialCustomers,xel:RetailDistribution,xel:RegulatedElectric▄▃▃█▃▂▂▆▁▃▂▇▂▂756.0733.0710.0962.0718.0676.0661.0865.0624.0727.0664.0890.0678.0687.0NA835.0654.0685.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:MajorCustomers,us-gaap:ProductOrService,us-gaap:StatementBusinessSegments xel:ResidentialCustomers,xel:RetailDistribution,xel:RegulatedNaturalGas▄▆▅▁▂▅▅▁▂█▅▁▂▆257.0384.0328.0124.0167.0355.0326.0124.0182.0495.0325.0116.0157.0390.0NA114.0163.0374.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService us-gaap:Product▅█▄▅▁▃▃▄▁▆▃▅▂▄2916.03309.02769.02963.02441.02674.02654.02875.02463.03040.02735.02915.02545.02824.0NA2887.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService xel:OtherServices▇▁█▃▄▄▃▂▂▅▃▃▄█62.032.069.045.047.049.043.037.037.052.042.042.047.067.0NA51.050.050.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService xel:RetailDistribution▆▅▄▆▁▄▄▆▂█▄▆▂▅2472.02388.02357.02534.02081.02327.02324.02482.02145.02668.02366.02523.02172.02446.0NA2506.02192.02452.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService xel:TransmissionServices▇▇▆██▅▁▇▄▅▄▆▅▄148.0146.0137.0157.0153.0132.098.0151.0127.0131.0125.0143.0132.0123.0NA136.0126.0121.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService xel:WholesaleDistribution▂█▂▂▁▁▁▂▁▁▂▂▁▁234.0743.0206.0227.0160.0166.0189.0205.0154.0189.0202.0207.0194.0188.0NA194.0172.0181.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService,us-gaap:StatementBusinessSegments us-gaap:Product,us-gaap:AllOtherSegments▅█▅▄▂██▂▂▅▅▁▁▂19.021.019.018.017.021.021.017.017.019.019.016.016.017.0NA17.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService,us-gaap:StatementBusinessSegments us-gaap:Product,xel:RegulatedElectric▅█▂█▂▁▁▇▂▃▂█▃▂2472.02698.02217.02737.02158.02086.02107.02652.02148.02237.02190.02700.02267.02182.0NA2677.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService,us-gaap:StatementBusinessSegments us-gaap:Product,xel:RegulatedNaturalGas▄▆▅▁▂▅▅▁▂█▅▁▂▆425.0590.0533.0208.0266.0567.0526.0206.0298.0784.0526.0199.0262.0625.0NA193.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService,us-gaap:StatementBusinessSegments xel:OtherServices,xel:RegulatedElectric▄▂▃▃▄▃▁▂▂▃▃▃▅█20.013.018.017.021.017.07.013.011.018.018.017.024.039.0NA31.027.025.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService,us-gaap:StatementBusinessSegments xel:OtherServices,xel:RegulatedNaturalGas▆▁█▃▃▄▅▂▃▄▂▂▂▃42.019.051.028.026.032.036.024.026.034.024.025.023.028.0NA20.023.025.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService,us-gaap:StatementBusinessSegments xel:RetailDistribution,us-gaap:AllOtherSegments▅█▅▄▂██▂▂▅▅▁▁▂19.021.019.018.017.021.021.017.017.019.019.016.016.017.0NA17.014.018.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService,us-gaap:StatementBusinessSegments xel:RetailDistribution,xel:RegulatedElectric▅▁▂█▂▁▂▇▂▃▂█▃▂2070.01796.01856.02336.01824.01771.01813.02283.01856.01899.01845.02333.01917.01832.0NA2316.01930.01865.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService,us-gaap:StatementBusinessSegments xel:RetailDistribution,xel:RegulatedNaturalGas▄▆▅▁▂▅▅▁▂█▅▁▂▆383.0571.0482.0180.0240.0535.0490.0182.0272.0750.0502.0174.0239.0597.0NA173.0248.0569.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService,us-gaap:StatementBusinessSegments xel:TransmissionServices,xel:RegulatedElectric▇▇▆██▅▁▇▄▅▄▆▅▄148.0146.0137.0157.0153.0132.098.0151.0127.0131.0125.0143.0132.0123.0NA136.0126.0121.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService,us-gaap:StatementBusinessSegments xel:WholesaleDistribution,xel:RegulatedElectric▂█▂▂▁▁▁▂▁▁▂▂▁▁234.0743.0206.0227.0160.0166.0189.0205.0154.0189.0202.0207.0194.0188.0NA194.0172.0181.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues us-gaap:ConsolidationItems us-gaap:OperatingSegments▅█▅▆▃▄▄▅▃▆▄▅▃▅▄▅▃▅▄▅▂▄▃▄▂▅▅▄▃▆▄▄▃▄▃▃▁3068.03541.02947.03182.02586.02811.02798.03013.02577.03141.02880.03048.02658.02951.02795.7533016.8972644.9282946.4222794.6513040.1472499.8492772.2732645.8212901.3122515.1342962.2192928.6282869.8072685.0963202.6042730.8222822.3382578.9132782.8492551.1352724.3412274.668NANANANANANANANANANANANANA
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 us-gaap:Revenues us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,xel:RegulatedElectric▅▇▄█▃▂▃▇▃▃▃▇▄▃▃▇▃▃▃▇▃▂▂▆▃▃▃▆▃▃▂▅▃▂▁▅▁2597.02870.02372.02941.02286.02203.02230.02771.02249.02325.02300.02802.02348.02270.02255.3542783.5692338.0172299.062290.5562799.9642224.1422185.1192170.1832667.482213.462224.8632250.1912616.3512297.6382301.712122.0472599.9252220.1852092.1962010.9762532.7092037.126NANANANANANANANANANANANANA
 us-gaap:Revenues us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,xel:RegulatedNaturalGas▄▆▅▁▂▅▅▁▂▇▅▂▂▆▄▁▂▅▄▁▂▅▄▁▂▆▆▂▃█▅▁▃▆▄▁▁449.0647.0554.0219.0280.0583.0544.0222.0308.0794.0558.0227.0292.0662.0520.205214.253289.839625.703484.868221.956258.899565.689455.935216.019284.131715.996657.274236.649369.127879.688588.404205.358341.878669.596520.513174.513221.532NANANANANANANANANANANANANA
us-gaap:UnregulatedOperatingRevenue ▄▇▃▄▂█▇▂▂▄▄▁22.024.021.022.020.025.024.020.020.022.022.019.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:Assets ██▇▇▇▇▆▆▆▆▅▅▅▅▅▅▄▄▄▄▄▄▄▄▃▃▃▃▃▃▃▂▂▂▂▂▂▁▂▁▁▁▁56779.056511.053957.053708.053456.051133.050448.050240.048584.047850.045987.044835.044240.043159.043030.042468.79441860.98941285.34141155.27740324.7539490.16439069.84439053.53538029.69637268.80936878.65136957.88435363.44134717.64434198.75233907.4933126.65232266.26231587.67531140.68631057.49829820.14329453.25329497.26728537.85428003.22427466.64927387.69NANANA25305.961NANANA
us-gaap:LiabilitiesAndStockholdersEquity ██▇▇▇▇▆▆▆▆▅▅▅▅▅▅▄▄▄▄▄▄▄▄▃▃▃▃▃▃▃▂▂▂▂▂▂▁▂▁▁▁▁56779.056511.053957.053708.053456.051133.050448.050240.048584.047850.045987.044835.044240.043159.043030.042468.79441860.98941285.34141155.27740324.7539490.16439069.84439053.53538029.69637268.80936878.65136957.88435363.44134717.64434198.75233907.4933126.65232266.26231587.67531140.68631057.49829820.14329453.25329497.26728537.85428003.22427466.64927387.69NANANA25305.961NANANA
us-gaap:StockholdersEquity ███▇▆▆▆▆▅▅▅▅▄▄▄▄▄▄▄▄▃▃▃▃▃▃▃▃▂▂▂▂▂▁▁14792.014700.014575.013777.013385.013302.013239.013141.012366.012329.012222.012165.011650.011561.011455.011439.37711123.15511070.11111020.84910987.94210703.13410671.63410600.9210544.8310269.06610214.8710214.48210154.669920.7729747.4249565.959547.2869300.2459155.1138874.077NANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:AssetsCurrent ▇█▄▆█▃▃▅▃▃▃▃▃▂▃▃▂▂▂▃▂▂▃▄▃▃▄▄▃▃▄▃▂▂▂▄▁▁▃▂▁▁▂4147.04315.03275.03837.04390.02983.03113.03600.02939.02909.03094.03003.03056.02782.02973.02898.8742756.552633.1542842.0813076.1632704.0992732.6172910.4453344.4223048.9223057.4463364.383196.5943123.823129.3463218.043120.7412818.22704.6712625.1393370.8442560.4082542.8342982.5642861.4732478.9632514.1292732.643NANANA2976.635NANANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▃▅▁▅█▂▂▅▂▁▁▂▂▁▁▁▁▁▁▂▁▁▁▃▁▁▁▁▁▁▁▁▁▁▁▄▁▁▁▂▁▁▁▂▁▁▁538.01039.0129.0885.01625.0244.0248.0864.0353.094.0147.0213.0332.0116.083.0167.84161.38273.98584.476353.38576.711101.49184.94404.409135.597133.04479.608137.86899.54132.313107.144101.83458.821112.9682.323747.27363.5399.74260.684194.155101.60394.338108.437223.61174.68985.382115.648NANANA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents ▃▅▁▅█▂▂▄▂▁▁538.01039.0129.0885.01634.0244.0248.0864.0353.094.0147.0NANANA83.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:AccountsReceivableNetCurrent ▇█▇▆▄▅▅▅▃█▆▅▄▆▄▄▃▄▄▃▂▃▃▃▂▅▅▃▃▆▃▄▃▄▃▂▁▃▃▃▂948.0959.0916.0899.0799.0839.0837.0821.0737.0974.0860.0856.0808.0868.0797.0807.621759.378781.248776.289754.248689.564729.386724.606741.23676.223826.797826.506760.213742.73885.098744.16786.874719.069789.209718.046704.58645.264718.145753.12752.123679.56NA718.474NANANANANANANA
us-gaap:InventoryNet ▃▂▄▄▃▃▅▅▃▁▅▄▄▃▇▇▅▄▇▇▄▄▇█▄▃▆█▃▁▆▇▃▁▄▅▂▂▇▇▃▁▅500.0469.0535.0512.0487.0488.0544.0544.0483.0445.0548.0528.0511.0492.0610.0616.675542.044519.081604.226614.908526.785520.054608.584644.963532.703505.213597.183634.262501.27436.237576.538604.628494.89447.709535.574562.721473.137474.359618.232608.007484.772442.205560.8NANANA566.205NANANA
 us-gaap:OtherAssetsCurrent us-gaap:ConsolidatedEntities srt:ParentCompanyNANA6.0NANANA12.0NANANA1.0NANANA1.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PrepaidExpenseAndOtherAssetsCurrent ▅▆▆▅▄▅▄▄▃▄▂▂▃▄▃▂▂▂▂▁▁▂▂▂▂▂▃▇▇█▆▆▇▆▃▃▄▄▁▄▄221.0244.0250.0232.0208.0230.0185.0193.0175.0191.0154.0157.0164.0188.0183.0143.12135.493145.203138.682122.786126.146154.143155.734142.797141.774155.435171.112270.529270.717295.479252.258236.764264.253246.079171.315174.715195.357192.746121.48191.852186.884NA193.621NANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:PropertyPlantAndEquipmentGross ████▇▇▇▇▆▆▆▆▅▅▅▅▅▅▅▄▄▄▄▄▄▃▃▃▃▃▃▂▂▂▂▂▂▂▂▁▁▁▁61181.060284.059296.059383.057897.057161.055844.054871.053545.052671.052249.051032.050413.049580.048927.048532.36547824.26747294.16646832.21946108.73645519.78644862.93644413.51343177.81342494.57641928.6441535.14240343.40739627.9138960.66438386.35337468.436810.34536098.72835511.84335070.5734504.46534009.18533714.36732901.52632508.99631804.59531435.251NANANA28983.171NANANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment ██▇██▇▇▇▇▆▆▆▆▆▅▅▅▅▅▄▄▄▄▄▄▄▃▃▃▃▃▃▂▂▂▂▂▂▂▁▁▁▁17382.017060.016657.017456.017097.016730.016735.016549.016278.015961.015659.015483.015479.015276.015000.014982.70914703.39114576.3214381.60314218.68314035.59113790.48913591.25913724.33313543.35113373.00813168.41813028.21812854.91312741.17612608.30512462.71612344.99512216.16412048.69712023.29611852.56111731.34111658.35111484.61211378.69611223.24111068.82NANANA10776.667NANANA
us-gaap:PropertyPlantAndEquipmentNet ███▇▇▇▇▆▆▆▆▆▅▅▅▅▅▅▅▄▄▄▄▄▄▃▃▃▃▃▃▂▂▂▂▂▂▂▂▁▁▁▁44141.043582.042950.042227.041124.040776.039483.038703.037651.037114.036944.035879.035289.034679.034329.033949.95233543.84333158.38432841.7532206.69631823.28231433.40631205.85129828.60929350.36428966.91128756.91627630.36327070.37726541.48226122.15925342.57824813.41124219.23123809.34823401.59723047.85422672.68622353.36721729.48821513.53920908.33320663.082NANANA18508.296NANANA
us-gaap:OperatingLeaseRightOfUseAsset ▇▇▇▇▆▆███▇▁1390.01440.01490.01534.01229.01260.01672.01718.01763.01619.00.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAssetsNoncurrent ▄▄▃▃█▄▄▄▄▄▃▃▃▃▃▃▃▃▃▁▁▁▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂395.0409.0379.0348.01019.0516.0492.0478.0490.0499.0272.0272.0273.0280.0278.0259.117255.47247.351248.53267.71638.41532.998124.42182.058176.172174.608175.957177.365173.509170.064217.241178.169184.15177.076200.008203.506193.566192.157155.926164.495163.817168.473180.044NANANA162.296NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:AccountsPayableCurrent ▅▅▅█▄▃▅▅▃▄▅▄▄▃▅▃▃▂▃▂▂▁▂▂▁▂▄▃▃▃▅▃▃▂▂▂▂▁▂▁▂▂▃1273.01213.01237.01602.01188.0996.01294.01258.01057.01154.01237.01189.01092.01027.01243.0992.498973.642861.5061044.959916.534921.973809.656960.982924.26830.278898.0031173.0061061.385967.2511061.8741261.238965.572998.607932.547959.093885.099871.069786.187902.078837.259957.521848.568979.75NANANA1083.572NANANA
us-gaap:DividendsPayableCurrent ██▇▇▇▇▆▆▆▆▅▅▅▅▄▄▄▄▄▄▄▄▃▃▃▃▃▃▃▃▂▂▂▂▂▂▁▁▁▁▁▁▁246.0246.0231.0226.0226.0226.0212.0212.0209.0208.0195.0194.0193.0193.0183.0182.795182.795182.795172.456172.704172.704172.704162.41162.324162.224162.13151.72151.623151.097150.25139.432139.333139.24133.238131.748131.653131.565126.601126.487127.497127.04123.31122.847NANANA113.147NANANA
us-gaap:LiabilitiesCurrent ▆▆▅▅▇█▅▆▆▅▅▄▅▄▄▃▄▄▃▃▃▂▄▂▃▄▄▃▂▃▃▂▁▁▂▂▄▄▃▁▁▁▁4950.04877.04239.04393.05473.05839.04568.05021.05060.04424.04460.03838.04178.04122.04088.03340.4063690.7043707.9763247.0433453.9723506.3813188.5684058.2973085.023537.2513774.5284064.5833470.8693059.9293467.7483654.4982839.0612696.812526.5172937.0733160.5343831.2223708.0423588.6392653.1832638.7592484.7562536.533NANANA3089.999NANANA
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 us-gaap:LongTermDebtCurrent dei:LegalEntity xel:OtherSubsidiariesDomainNANA2.0NANANA2.0NANANA1.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
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us-gaap:OperatingLeaseLiabilityCurrent ██▇▇▂▁▆220.0221.0214.0208.0149.0143.0194.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherLiabilitiesCurrent ▄▃▄▄▃▃█▇▇▆▅▄▄▄▅▅▄▃▅▅▄▃▅▆▅▅▅▄▃▂▃▄▂▁▂▂▃▃▃▂▂▁▁409.0370.0407.0416.0396.0379.0662.0614.0614.0549.0463.0435.0441.0429.0501.0486.713439.917393.489503.953457.803448.549392.446490.197561.579499.946463.437475.119396.564341.123333.078377.776445.488288.822253.77287.802302.317338.635348.921381.819328.958278.749248.408276.111NANANA227.333NANANA
us-gaap:TaxesPayableCurrent ▄█▆▅▃▆▅▅▃▆▅▄▃▆▅▄▃▆▅▄▃▆▅▄▂▅▄▄▂▅▄▃▂▄▃▂▁▃▂▂▁▃▂428.0684.0578.0504.0343.0553.0466.0443.0342.0555.0450.0428.0316.0544.0448.0427.275339.966544.177457.392422.437330.398525.934438.189379.103280.838480.311396.615371.959269.02461.52378.766335.846242.339415.081334.441264.792215.159359.064289.713250.135189.564312.669254.32NANANA257.739NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:LongTermDebt ██▅▆▆▂▂▁21497.021491.020066.020361.020564.018112.018109.017672.0NANA16209.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LongTermDebtNoncurrent us-gaap:ConsolidatedEntities srt:ParentCompanyNANA4342.0NANANA3948.0NANANA3373.0NANANA2878.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:DeferredFinanceCostsNoncurrentNet NANA167.0NANANA148.0NANANA126.0NANANA119.0NANANA109.0NANANA92.0NANANA85.0NANANA83.0NANANA85.0NANANA75.0NANANA74.0NANANA69.0NANANA
us-gaap:LongTermDebtAndCapitalLeaseObligations ██▇▇▇▆▆▅▅▅▅▅▅▄▄▄▄▄▄▄▃▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▁▁▁▁▁▁▁21476.021470.019645.019960.019463.017010.017407.016819.015996.016118.015803.015508.015311.014522.014520.014572.96714091.83313696.46114194.71813402.58313104.7713148.39512490.71912690.75111896.12611499.4711499.63411501.7211752.77811205.31910910.75410914.27310816.47710642.00910143.90510105.9478706.4038598.3638848.5139450.1579263.5569264.1239263.144NANANA7888.628NANANA
us-gaap:DeferredIncomeTaxLiabilitiesNet █▇▇▆▃▁▁4807.04765.04746.04696.04569.04492.04509.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent ▁▁▃▂▂▂▄▅▅▄▆▅▅▅▇▆▆▆▇▅▄▄▆▅▅▅▆▂▂▂▄▆▆▆█▄▄▄▆▄▄▄▆521.0516.0666.0651.0636.0622.0785.0856.0850.0838.0994.0909.0884.0884.01042.0984.794975.606964.3981112.366843.739825.614812.998941.002863.645858.45850.826936.907653.599650.596642.126769.222998.212988.773979.521163.265810.057826.413813.7921001.906829.364828.5824.5962.767NANANA839.051NANANA
us-gaap:OtherLiabilitiesNoncurrent ▄▅▃▃▃▄▃▃▃▄▄▄▅▁▁▁▅▆▅███▇▇██▇▆▆▆▆▆▆▆▅▅▅▅▄▅▅▅▆208.0225.0183.0178.0185.0196.0186.0186.0190.0212.0206.0202.0226.0143.0145.0144.528225.215235.333223.965277.561280.647285.743261.756263.452279.766286.487264.653243.917237.241244.543237.217239.519245.443250.679229.207224.4217.053219.273203.313221.616225.757226.783249.635NANANA211.666NANANA
us-gaap:OperatingLeaseLiabilityNoncurrent ▆▆▇▇▆▆███▇▁1236.01287.01344.01395.01125.01163.01549.01598.01647.01529.00.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo NANA258.0NANANA267.0262.0262.0234.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo us-gaap:PropertyPlantAndEquipmentByType us-gaap:PropertyPlantAndEquipmentOtherTypesNANA30.0NANANA29.026.025.026.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo us-gaap:PropertyPlantAndEquipmentByType xel:PurchasedPowerAgreementsNANA228.0NANANA238.0236.0237.0208.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree NANA239.0NANANA253.0267.0267.0239.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree us-gaap:PropertyPlantAndEquipmentByType us-gaap:PropertyPlantAndEquipmentOtherTypesNANA21.0NANANA28.029.024.029.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree us-gaap:PropertyPlantAndEquipmentByType xel:PurchasedPowerAgreementsNANA218.0NANANA225.0238.0243.0210.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour NANA230.0NANANA239.0253.0253.0225.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour us-gaap:PropertyPlantAndEquipmentByType us-gaap:PropertyPlantAndEquipmentOtherTypesNANA21.0NANANA25.028.027.028.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour us-gaap:PropertyPlantAndEquipmentByType xel:PurchasedPowerAgreementsNANA209.0NANANA214.0225.0226.0197.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive NANA204.0NANANA230.0239.0239.0210.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive us-gaap:PropertyPlantAndEquipmentByType us-gaap:PropertyPlantAndEquipmentOtherTypesNANA15.0NANANA22.025.021.025.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive us-gaap:PropertyPlantAndEquipmentByType xel:PurchasedPowerAgreementsNANA189.0NANANA208.0214.0218.0185.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive NANA655.0NANANA865.01095.01095.01019.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive us-gaap:PropertyPlantAndEquipmentByType us-gaap:PropertyPlantAndEquipmentOtherTypesNANA94.0NANANA115.0136.0136.0136.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive us-gaap:PropertyPlantAndEquipmentByType xel:PurchasedPowerAgreementsNANA561.0NANANA750.0959.0959.0883.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:StockholdersEquity ███▇▆▆▆▆▅▅▅▅▄▄▄▄▄▄▄▄▃▃▃▃▃▃▃▃▂▂▂▂▂▁▁14792.014700.014575.013777.013385.013302.013239.013141.012366.012329.012222.012165.011650.011561.011455.011439.37711123.15511070.11111020.84910987.94210703.13410671.63410600.9210544.8310269.06610214.8710214.48210154.669920.7729747.4249565.959547.2869300.2459155.1138874.077NANANANANANANANANANANANANANANA
us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest ███▇▇▇▇▆▆▆▆▆▅▅▅▅▅▅▄▄▄▄▄▄▄▄▄▄▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▁▁▁▁14792.014700.014575.013777.013385.013302.013239.013141.012366.012329.012222.012165.011650.011561.011455.011439.37711123.15511070.11111020.84910987.94210703.13410671.63410600.9210544.8310269.06610214.8710214.48210154.669920.7729747.4249565.959547.2869300.2459155.1138874.0778850.1638573.5058537.6718482.1988431.3038234.5658181.4838083.5197605.6777391.8227355.8717283.245NANANA
us-gaap:CommonStockValue ███▆▆▆▆▆▅▅▅▅▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▃▃▃▃▃▂▂▂▂▂▁▁▁▁1346.01345.01344.01314.01313.01313.01311.01311.01287.01287.01285.01283.01272.01272.01269.01269.4071269.4071269.4071268.0571269.8821269.8821269.8821268.8391268.1681267.3981266.6591264.3331263.561262.7641252.8791244.9291244.0641243.2391236.8881219.8991219.0321218.2141217.3391216.2341212.3691211.3561210.4111205.834NANANA1143.773NANANA
us-gaap:AdditionalPaidInCapitalCommonStock ███▆▆▆▅▅▄▄▄▄▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▂▂▂▂▂▁▁▁▁▁▁▁7435.07411.07404.06694.06679.06659.06656.06636.06190.06173.06168.06125.05920.05903.05898.05888.7295881.4755872.9335881.4945898.8965896.3945889.9395889.1065873.445863.2095844.9955837.335815.7145799.9685681.155619.3135615.7165595.9065515.5135353.0155334.7155316.6585298.5725327.4435280.4635261.687NA5229.075NANANANANANANA
us-gaap:RetainedEarningsAccumulatedDeficit ████▇▇▇▇▆▆▆▆▆▅▅▅▅▅▅▅▄▄▄▄▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▁▁▁6146.06082.05968.05912.05538.05478.05413.05336.05024.04996.04893.04876.04580.04510.04413.04386.054079.0684036.3523981.6523924.1253643.6533620.4213552.7283506.8613243.6453209.9043220.9583177.3872961.4062918.2152807.9832797.4862572.9352516.3322413.8162406.0162140.6392089.2752032.5562019.441812.5051781.3861701.703NANANA1419.201NANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▂▂▂▁▁▁▂▁▂▃▃▃▃▃▃▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▃▄▄▄▇▅▆███-135.0-138.0-141.0-143.0-145.0-148.0-141.0-142.0-135.0-127.0-124.0-119.0-122.0-124.0-125.0-104.809-106.795-108.581-110.354-104.961-106.795-108.608-109.753-103.639-105.186-106.688-108.139-102.001-103.366-104.82-106.275-109.98-111.835-113.62-112.653-109.6-102.006-67.515-94.035-80.969-50.983-51.847-53.093NANANA-49.709NANANA
us-gaap:StockIssuedDuringPeriodValueNewIssues ▁▁█▁▁▁▁▅▁▁▁▃▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▂▂▁▁▂▃▁▁▁▁▁▁▁▁▅▁▁▁15.015.0731.010.011.012.010.0462.010.012.035.0208.010.017.0-0.0370.00.05.0370.00.12-0.187-2.7129.8149.43510.0553.2199.9589.931120.93863.7229.7859.79174.291168.8349.6379.4979.3575.14339.9179.7519.0176.229458.8538.9978.64312.644NANANANA
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue ▇▁▆▆▆▂▆▆▆▂▇▆▆▂▇▆▆▁█▄▆▅▆▄▇▆█▆▆▆▂▇█▇▇▇▇▇▇▇▇▇▆▇▇▆9.0-9.07.07.08.0-8.08.07.06.0-7.09.08.07.0-8.08.9946.1567.74-9.8913.9670.9866.6425.3776.5231.5668.8986.77212.4316.6117.7656.065-5.32310.84412.45310.6539.539.3789.6048.92710.92810.03812.08210.8068.1319.0189.0775.793NANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▅▁▅▇▄▅▅█▄▆▅▇▅▆▆▇▅▅▅▇▅▆▄▇▄▇▅▇▄▅▅▆▄▅▄▅▄▄▄▆▄▅▄▅▄▅625.0-136.0674.01026.0479.0669.0706.01223.0541.0793.0629.01056.0550.0887.0758.821075.361573.664718.155639.4451000.315622.476790.063535.917980.877523.651985.394643.851964.83446.862592.649581.128928.683431.897642.328432.835706.625387.813477.483481.404801.002463.673659.443367.619613.108361.638551.577NANANANA
us-gaap:NetCashProvidedByUsedInInvestingActivities ▄▅▁█▅▂▄▃▆▆▃▆▅▅▅▆▆▆▅▆▆▆▂▆▆▆▅▆▆▆▅▆▆▆▆▇▇█▇▇█▇▃▇██-1167.0-1035.0-1719.0-441.0-974.0-1606.0-1214.0-1421.0-856.0-852.0-1280.0-841.0-993.0-872.0-1057.4-764.522-726.339-747.739-1055.156-762.937-749.213-694.107-1483.526-708.225-692.634-738.389-882.495-703.531-730.455-800.77-902.59-798.817-798.713-713.264-723.346-653.234-557.35-399.012-586.846-571.072-465.535-624.348-1285.766-586.532-474.314-460.112NANANANA
us-gaap:NetCashProvidedByUsedInFinancingActivities ▄█▄▁█▆▄▅▅▄▅▃▅▄▄▃▄▄▄▄▄▄▅▄▄▃▄▃▄▄▄▄▄▄▃▅▄▄▄▃▄▄▅▄▄▃41.02081.0289.0-1334.01885.0933.0-108.0709.0574.06.0585.0-334.0659.018.0213.215-204.38140.07219.093146.80239.296101.957-79.405628.14-3.84171.536-193.569180.384-222.971250.82233.29326.772-86.853312.677101.573-374.439630.352133.325-39.413-28.029-137.3789.127-49.194802.973122.346101.983-121.731NANANANA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect ▂▆▁▁█▃▁▅▄▃-501.0910.0-756.0-749.01390.0-4.0-616.0511.0259.0-53.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:DeferredIncomeTaxExpenseBenefit ▁▂▁▃▁▃▃▄▃▃▃▄▄▄▆▇▅▇▅█▅▆▅█▅▄▆▇▄▆▅▆▅▅▄▆▅▆▄▇▄▅▄▆▄▅-44.0-23.0-53.045.0-34.034.013.083.021.026.034.074.051.059.0138.987191.774115.499193.74107.55226.21192.51160.379106.777237.927108.39182.773136.154196.74586.015150.464105.4173.978105.022130.66267.681162.055110.932167.42677.212191.71882.785114.85288.93154.2776.70994.551NANANANA
us-gaap:IncreaseDecreaseInAccountsPayable ▅▅▇▆▆▁▆▇▂▅▆▆▆▄▇▅▇▃▇▆▆▅▅▆▅▃▇▅▃▄█▅▅▅▆▆▆▁▇▃▇▄▇▄▅▁6.0-21.064.063.041.0-201.044.0101.0-161.04.053.038.041.0-42.0110.759-15.4169.041-121.3967.21822.72149.868-22.063-3.86515.895-33.003-99.029102.546-8.054-110.004-37.73135.738-4.922-3.6865.31117.94958.825.573-202.64996.429-114.797104.54-72.42494.268-56.687-27.052-199.384NANANANA
us-gaap:IncreaseDecreaseInInventories ▅▄▆▆▅▄▅▇▆▃▇▆▅▂▄▇▅▂▄▇▅▂▄▇▅▂▄█▆▁▄▇▆▂▄▇▅▁▅▄▄█▄▃▄█32.0-39.043.052.018.0-33.024.085.059.0-84.0102.064.017.0-118.0-6.15874.59122.922-88.355-7.55288.0836.69-88.57-36.419112.2227.449-92.01-37.119132.94565.033-140.301-26.33110.60247.181-87.865-27.14789.584-1.222-143.87310.225-28.821-42.567118.595-34.759-76.302-11.962113.784NANANANA
us-gaap:NetCashProvidedByUsedInOperatingActivities ▅▁▅▇▄▅▅█▄▆▅▇▅▆▆▇▅▅▅▇▅▆▄▇▄▇▅▇▄▅▅▆▄▅▄▅▄▄▄▆▄▅▄▅▄▅625.0-136.0674.01026.0479.0669.0706.01223.0541.0793.0629.01056.0550.0887.0758.821075.361573.664718.155639.4451000.315622.476790.063535.917980.877523.651985.394643.851964.83446.862592.649581.128928.683431.897642.328432.835706.625387.813477.483481.404801.002463.673659.443367.619613.108361.638551.577NANANANA
us-gaap:NetIncomeLoss ▄▄▃█▃▃▃▇▃▄▂▆▃▃▂▆▂▃▂▆▂▃▂▅▂▁▂▄▂▃▁▄▂▃▁▅▂▂▁▄▁▂▁▄▁▁311.0362.0288.0603.0287.0295.0292.0527.0238.0315.0214.0491.0265.0291.0189.0492.141227.256239.277227.477457.795196.795241.312209.025426.463196.931152.066196.339368.582195.164261.221150.055364.752196.857236.57140.17398.106183.06183.893140.509338.332158.762203.569136.634312.306139.776167.118NANANANA
us-gaap:ShareBasedCompensation ▅▄▅▆▅█▄▅▆▆▇▅▃▃▅▅▅▆▅▃▅▅▅▄▅▄▆▃▃▃▁▄▄▄▃▃▅▃▅▅▄▄▄▄▄▄12.09.013.019.015.026.011.012.016.019.020.015.04.06.012.76112.34713.93917.95311.2985.41811.35513.09915.1638.34511.19510.22515.6535.5465.625.37-3.7499.61510.588.1676.0843.63713.3663.88313.06311.64410.4049.8958.53510.8029.3417.129NANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▄▅▁█▅▂▄▃▆▆▃▆▅▅▅▆▆▆▅▆▆▆▂▆▆▆▅▆▆▆▅▆▆▆▆▇▇█▇▇█▇▃▇██-1167.0-1035.0-1719.0-441.0-974.0-1606.0-1214.0-1421.0-856.0-852.0-1280.0-841.0-993.0-872.0-1057.4-764.522-726.339-747.739-1055.156-762.937-749.213-694.107-1483.526-708.225-692.634-738.389-882.495-703.531-730.455-800.77-902.59-798.817-798.713-713.264-723.346-653.234-557.35-399.012-586.846-571.072-465.535-624.348-1285.766-586.532-474.314-460.112NANANANA
us-gaap:PaymentsToAcquireProductiveAssets ▄▄█▅▄█▅▆▃▃▅▃▄▃▄▃▂▃▄▃▂▂▇▂▂▃▃▂▃▃▄▃▃▃▃▂▂▁▂▁▂▁▂▂▁▁943.01024.01688.01112.0962.01607.01207.01329.0845.0844.01197.0857.01020.0883.01062.548782.659724.72749.0731069.067773.354712.81700.3191496.99708.41707.35770.609898.452725.591753.12822.628941.127857.42844.527752.251764.366702.281606.344497.218601.361481.937581.93540.339655.34594.656486.089481.242NANANANA
us-gaap:PaymentsToAcquireInvestments ▅▃▂▂▄█▅▁▃▄▄▂▃▃▇▆▃▃▂▂▃▂▅▂429.0199.0123.0115.0325.0835.0523.0-16.0183.0305.0359.0127.0182.0185.0725.531603.203195.528172.738156.58170.151210.507109.373484.664133.16NANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▄█▄▁█▆▄▅▅▄▅▃▅▄▄▃▄▄▄▄▄▄▅▄▄▃▄▃▄▄▄▄▄▄▃▅▄▄▄▃▄▄▅▄▄▃41.02081.0289.0-1334.01885.0933.0-108.0709.0574.06.0585.0-334.0659.018.0213.215-204.38140.07219.093146.80239.296101.957-79.405628.14-3.84171.536-193.569180.384-222.971250.82233.29326.772-86.853312.677101.573-374.439630.352133.325-39.413-28.029-137.3789.127-49.194802.973122.346101.983-121.731NANANANA
us-gaap:ProceedsFromIssuanceOfLongTermDebt ▁▆▁▂█▁▄▄▂▂▂▂▄▁▁▄▂▁▃▂▃▃▁▃▃▁▁▁▃▂▁▁▃▂▁▆▁▁▁▃▁▁▂▂0.01821.00.0493.02447.00.0983.01118.0427.0392.0294.0195.01186.00.095.8371028.117394.0460.0791.126295.212590.303747.127-0.978785.656841.5340.0-0.21-0.788542.583295.999-3.09497.944842.763494.28298.8091580.307110.270.745-0.088688.6860.00.0395.038494.163NANANANANANA
us-gaap:RepaymentsOfLongTermDebt ▁▅▄▇▁▁▆▁▁▅▂▄▁▁▁█▃▁▅▁▆▁▁▃▁▁▁▁▃▁▁▁▅▃▇▇▁▁▁▂▁▁▄▃▁▁-1.0400.0300.0701.00.00.0550.0-1.00.0400.0151.0300.01.00.0-0.099779.702250.180.217455.7340.191579.6430.3330.238250.19-0.0010.4550.240.224275.260.224-2.4133.348400.149251.367649.231651.0771.6970.7581.098102.7841.190.551359.931174.5920.50525.355NANANANA
us-gaap:PaymentsOfDividends █▇▇▇▇▆▆▆▆▅▅▅▅▅▅▅▅▅▅▅▅▄▄▄▄▃▃▃▃▂▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁237.0223.0218.0217.0217.0204.0204.0200.0200.0187.0186.0185.0184.0175.0182.955182.795182.794172.456172.704172.704172.703162.41154.357154.195153.997144.025143.825143.225142.328132.033131.894131.756125.966124.426124.189124.058119.348119.162123.39119.655116.094115.621109.923109.8106.422105.965NANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value13461345134413141313131313111311128712871285128312721272126912691269126912681269126912691268126812671266126412631262125212441244124312361219121912181217121612121211121012051143
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.42.42.52.42.52.62.62.62.62.72.82.92.92.92.93.03.03.13.13.13.23.33.23.33.43.43.43.63.63.73.73.83.93.93.93.94.14.14.14.24.34.44.44.5

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding

us-gaap:CommonStockSharesOutstanding


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-292018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-312009-12-31
Value538538537525525525524514514514514513508508507507507507507507507507507507506506505505505501497497497494487487487486486482457
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonStockSharesOutstanding us-gaap:StatementEquityComponents

us-gaap:CommonStock


Common
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-312008-12-31
Value537525525525524524514514514513508508507507507507507507507507507507506506505505505501497497497494487487487486486484484484482460459457453
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0101.8100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0100.00.00.0100.00.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value539539528527527521518516511510509509509508509509509508508507506503499498498490488488487485485484462460459
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value539538526527526519516515510510509508508508508508508508507506506503499498497489488487487485484483460460458
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value0.580.670.541.150.540.560.561.020.460.610.420.960.520.570.370.970.450.470.450.90.390.470.410.840.390.30.390.730.390.520.30.730.40.480.290.820.380.380.290.690.330.420.290.680.30.360.370.480.250.38
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value0.580.670.541.140.540.560.561.010.460.610.420.960.520.570.370.970.450.470.450.90.390.470.410.840.390.30.390.730.390.520.30.730.40.480.290.810.380.380.290.690.330.420.290.670.30.360.370.480.250.38
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value314365290605290288293520230312209494267292190494229241222459198242202428198153190369196262153366198235137390148210127308159204134313136168
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue10.210.39.819.011.210.210.517.38.99.97.316.210.09.96.816.49.08.67.915.17.98.77.714.87.95.26.512.97.38.25.613.07.78.55.414.36.58.25.010.96.57.35.211.95.96.0

Costs And Expenses

us-gaap:CostsAndExpenses

us-gaap:CostsAndExpenses


Costs
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2630303425212369216423562348225521672655254123522208247123702198218524602329221320682282220421152092261125372204228727082405215721762328223420031868219722242180207823892244206019822403
Percentage of CostsAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue85.785.785.574.583.783.883.974.884.184.588.277.283.183.784.872.986.087.783.372.882.782.383.372.983.288.286.676.885.284.688.176.484.483.787.673.682.285.386.677.085.384.987.478.485.985.6

Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value273340258646274289299599262340208564319350307696329355337696301369319665306235284564299396223557295355210600284259219531243315208478212
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue8.99.68.820.310.610.310.719.910.210.87.218.512.011.911.023.113.012.712.122.912.013.312.122.912.28.09.719.711.212.48.219.811.512.88.222.112.510.18.518.810.011.28.118.29.2

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-38.0-22.0-30.043-13.0-6.07.0722425-6.073545911820410211610923810412811023910983871951041357319398118702021017578193841127116676121
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue-1.2-0.6-1.01.4-0.5-0.20.32.40.90.8-0.22.42.02.04.26.84.04.23.97.84.24.64.28.24.42.83.06.83.94.22.76.93.84.32.77.44.52.93.16.83.54.02.86.33.34.3

us-gaap:IncomeTaxExpenseBenefit us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value0.01.01.00.01.00.00.00.00.00.02.00.00.0-0.368-0.587-0.511-0.534-0.556-0.588-0.594-0.604-0.6-0.446-0.382-0.382-0.378-0.393-0.365-0.358-0.396-0.266-0.451-1.429
Percentage of IncomeTaxExpenseBenefit-0.0-4.5-3.30.0-7.7-0.00.00.00.00.0-33.30.00.0-0.3-0.3-0.5-0.5-0.5-0.2-0.6-0.5-0.5-0.2-0.3-0.5-0.4-0.2-0.4-0.3-0.5-0.1-0.5-1.2
Percentage of RegulatedAndUnregulatedOperatingRevenue0.00.00.00.00.00.00.00.00.00.00.10.00.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.1
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Income Taxes Paid Net

us-gaap:IncomeTaxesPaidNet

us-gaap:IncomeTaxesPaidNet


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-2.0-3.05.0-7.0-10.00.0-106.0-1.0540.0-31.01.0-1.949-45.9043.8530.0-0.6880.1-53.931-7.414-0.6550.9664.099-62.697-0.4080.2464.540.164-0.337-3.174.258-17.9393.3130.3824.7021.173-2.1971.4264.058-59.051-34.0459.5797.4380.393
Percentage of IncomeTaxesPaidNet100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue-0.1-0.10.2-0.2-0.40.0-3.8-0.02.10.0-1.10.0-0.1-1.50.20.0-0.00.0-2.2-0.3-0.00.00.2-2.1-0.00.00.20.0-0.0-0.10.2-0.60.10.00.20.0-0.10.10.2-2.1-1.30.40.30.0

Interest And Debt Expense

us-gaap:InterestAndDebtExpense

us-gaap:InterestAndDebtExpense


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value206200203210196189185192179179164164164160155157156158154158156150146145138138136133129129133135136130133143144145145141138136139138134136
Percentage of InterestAndDebtExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue6.75.66.96.67.66.76.66.46.95.75.75.46.25.45.65.26.25.75.55.26.35.45.55.05.54.74.64.64.84.04.94.85.34.75.25.36.35.65.75.05.74.95.45.35.84.8

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-05-312013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value2122052122212081991951991891891771771751711651671641651611651621561531521441441441431391391441446.3146139144153151151152148146144147144141143
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue6.95.87.26.98.07.17.06.67.36.06.15.86.65.85.95.66.55.95.85.56.55.65.85.35.74.94.95.05.24.35.35.10.05.75.05.65.66.75.95.95.26.05.15.75.56.15.1

Interest Paid Net

us-gaap:InterestPaidNet

us-gaap:InterestPaidNet


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value18420617621815720715420015419014217813218112718712617413016712916411715810516110515598152103153104153127155124156126138116150-919.791135121132
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue6.05.86.06.96.17.45.56.66.06.04.95.85.06.14.66.25.06.24.75.55.25.94.55.44.25.53.65.43.74.83.85.44.15.55.05.75.56.14.94.94.85.3-35.85.25.34.7

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value311362288603287295292527238315214491265291189492227239227457196241209426196152196368195261150364196236140398183183140338158203136312139167
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue10.110.29.819.011.110.510.417.59.210.07.416.110.09.96.816.38.98.58.115.17.98.77.914.77.85.16.712.87.38.25.512.97.68.55.514.68.07.15.511.96.57.25.311.96.16.0

us-gaap:NetIncomeLoss us-gaap:StatementBusinessSegments

us-gaap:AllOtherSegments


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-26.0-25.0-50.0-29.0-22.0-23.0-32.0-22.0-34.0-24.0-23.0-32.0-26.0-22.0-55.955-12.77-13.472-17.803-15.481-16.307-20.578-15.263-11.83-7.339-11.141-12.6315.643.93-5.81-1.548-3.174-0.23-20.187-2.446
Percentage of NetIncomeLoss-8.4-6.9-17.4-4.8-7.7-7.8-11.0-4.2-14.3-7.6-10.7-6.5-9.8-7.6-29.6-2.6-5.9-7.4-6.8-3.6-10.5-6.3-5.7-1.7-5.7-8.32.91.1-3.0-0.6-2.1-0.1-10.3-1.0
Percentage of RegulatedAndUnregulatedOperatingRevenue-0.8-0.7-1.7-0.9-0.9-0.8-1.1-0.7-1.3-0.8-0.8-1.0-1.0-0.7-2.0-0.4-0.5-0.6-0.6-0.5-0.8-0.6-0.4-0.3-0.4-0.40.20.1-0.2-0.0-0.1-0.0-0.8-0.1
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:AllOtherSegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ElectricityUsRegulated


Net
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value632289227256550249234180514
Percentage of NetIncomeLoss104.8100.776.987.7104.4104.674.384.1104.7
Percentage of RegulatedAndUnregulatedOperatingRevenue19.911.28.19.118.39.77.46.216.9
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:ElectricityUsRegulated0.00.00.00.00.00.00.00.00.0

us-gaap:NaturalGasUsRegulated


Net
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value0.0209168-1.023105579.0
Percentage of NetIncomeLoss0.07.030.823.3-0.29.733.326.61.8
Percentage of RegulatedAndUnregulatedOperatingRevenue0.00.83.22.4-0.00.93.32.00.3
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:NaturalGasUsRegulated0.00.00.00.00.00.00.00.00.0

xel:RegulatedElectric


Net
Period End2021-06-302021-03-312020-06-302020-03-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value30426928922724923418051426421914150322719420347920517818743721481158360185185110365201174
Percentage of NetIncomeLoss97.774.3100.776.9104.674.384.1104.799.675.374.7102.2100.181.189.5104.7104.473.989.7102.7109.253.380.997.895.171.073.5100.1102.173.6
Percentage of RegulatedAndUnregulatedOperatingRevenue9.97.611.28.19.77.46.216.99.97.45.116.79.06.97.315.88.26.47.115.18.52.75.412.66.95.84.012.97.86.3
Percentage of RegulatedAndUnregulatedOperatingRevenue xel:RegulatedElectric0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

xel:RegulatedNaturalGas


Net
Period End2021-06-302021-03-312020-06-302020-03-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value33118209123105579.027951041.853136239-5.297117833-4.176-6.88383313.996157743-0.1741564
Percentage of NetIncomeLoss10.632.67.030.89.733.326.61.810.232.655.10.45.826.317.3-1.26.132.516.0-1.0-3.555.016.31.17.829.628.7-0.08.127.4
Percentage of RegulatedAndUnregulatedOperatingRevenue1.13.30.83.20.93.32.00.31.03.23.70.10.52.21.4-0.20.52.81.3-0.1-0.32.81.10.10.62.41.6-0.00.62.3
Percentage of RegulatedAndUnregulatedOperatingRevenue xel:RegulatedNaturalGas0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value311362603287295292527238315214491265291189492227239227457196241209426196152196368195261150364196236140398183183140338158203136312139
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.2100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue10.110.219.011.110.510.417.59.210.07.416.110.09.96.816.38.98.58.115.17.98.77.914.77.85.16.712.87.38.25.512.97.68.55.514.68.07.15.511.96.57.25.311.96.1
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value438507426813422455450758410486339696450480426818459486465827431489441785422350391665397493325665402454316720405380344651359426322568325403353465279370
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue14.314.314.525.516.316.216.125.215.915.511.822.816.916.315.227.118.117.316.727.217.317.716.727.116.811.813.423.214.815.411.923.615.616.312.426.417.814.713.423.014.715.112.621.614.114.413.520.113.913.8

Other Comprehensive Income Loss Net Of Tax

us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Other
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value1000000.01000000.01000000.02000000.01000000.0-2000000.01000000.01000000.03000000.0-1000000.02000000.01000000.01000.01114000.0982000.0956000.0948000.0-6266000.0878000.0865000.0211000.0-7023000.0884000.0883000.0876000.0-6597000.0847000.0864000.0864000.03039000.01179000.01135000.0-639000.0
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue0.00.00.00.10.0-0.10.00.00.1-0.00.10.00.00.00.00.00.0-0.20.00.00.0-0.30.00.00.0-0.20.00.00.00.10.00.0-0.0
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value2000000.03000000.01000000.01000000.01000000.0-8000000.03000000.0-8000000.0-9000000.0-6000000.0-4000000.01000000.01000000.00342000.01004000.0829000.0825000.0873000.0956000.0948000.0934000.0910000.0664000.0618000.0574000.0466000.0516000.0590000.0553000.0569000.0561000.0650000.0-292000.0
Percentage of OtherComprehensiveIncomeLossNetOfTax200.00.0100.0100.050.0-800.0-150.0-800.0-900.0-200.0400.050.0100.00.030.7102.286.787.0-13.9108.9109.6442.7-13.075.170.065.5-7.160.968.364.018.747.657.345.7
Percentage of RegulatedAndUnregulatedOperatingRevenue0.10.10.00.00.0-0.30.1-0.3-0.3-0.2-0.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0-0.0
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value3000000.03000000.02000000.03000000.0-7000000.01000000.0-7000000.0-8000000.0-3000000.0-5000000.03000000.02000000.01000.01455000.01986000.01786000.01773000.0-5393000.01834000.01813000.01145000.0-6114000.01547000.01502000.0
Percentage of OtherComprehensiveIncomeLossNetOfTax300.00.0200.0150.0-700.0-50.0-700.0-800.0-100.0500.0150.0200.0100.0130.6202.2186.8187.086.1208.9209.6542.787.1175.0170.1
Percentage of RegulatedAndUnregulatedOperatingRevenue0.10.10.10.1-0.20.0-0.2-0.3-0.1-0.20.10.10.00.10.10.10.1-0.20.10.10.0-0.20.10.1
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:OtherNonoperatingIncomeExpense


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3.05.00.01.05.0-11.02.08.02.04.0-6.0-7.0-2.01.08.8575.0892.6086.4461.5620.5781.564.25-0.3481.6260.9613.1610.6091.4040.0823.201-0.959-0.4040.4133.9221.2220.4880.7283.7370.962.550.9794.7661.009271.7090.975
Percentage of OtherNonoperatingIncomeExpense100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue0.10.10.00.00.2-0.40.10.30.10.1-0.2-0.2-0.10.00.30.20.10.20.10.00.10.2-0.00.10.00.10.00.00.00.1-0.0-0.00.00.10.00.00.00.10.00.10.00.20.01.00.10.0

Regulated And Unregulated Operating Revenue

us-gaap:RegulatedAndUnregulatedOperatingRevenue

us-gaap:RegulatedAndUnregulatedOperatingRevenue


Regulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value30683541294731822586281127983013257731412880304826582951279630162540280427943040249927722645290125152962292828692685320227302822257827822551272422742578256828312438281625662628230728072618231420162695
Percentage of RegulatedAndUnregulatedOperatingRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RegulatedAndUnregulatedOperatingRevenue us-gaap:ConsolidationItems

us-gaap:IntersegmentElimination


Regulated
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value-1.0-1.0-1.0-1.00.0-1.00.0-1.0-1.0-1.00.00.00.0-0.992-0.729-0.718-0.561-0.142-0.574-0.662-0.622-0.479-0.685-0.592-1.006-1.438-1.069-1.555-3.605-0.931-1.452-0.865-0.801-0.529-0.748-0.516
Percentage of RegulatedAndUnregulatedOperatingRevenue-0.0-0.0-0.0-0.00.0-0.00.0-0.0-0.0-0.00.00.00.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.1-0.1-0.0-0.1-0.0-0.0-0.0-0.0-0.0
Percentage of RegulatedAndUnregulatedOperatingRevenue-0.0-0.0-0.0-0.00.0-0.00.0-0.0-0.0-0.00.00.00.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.1-0.1-0.0-0.1-0.0-0.0-0.0-0.0-0.0
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:IntersegmentElimination100.0100.0100.0100.00.0100.00.0100.0100.0100.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments


Regulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value3069354129483183258728112799301325783142288130482658295127983016264429462796304024992772264529012515296229282869268532022730282225782782255127242274
Percentage of RegulatedAndUnregulatedOperatingRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.1100.0104.1105.1100.1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.1100.0104.1105.1100.1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:OperatingSegments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:MajorCustomers, us-gaap:ProductOrService

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

xel:CommercialandIndustrialCustomers, xel:RetailDistribution


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value14141229127614011154125512921447129714041333147112931326151013321352
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue46.134.743.344.044.644.646.248.050.344.746.348.348.644.950.152.448.2
Percentage of RegulatedAndUnregulatedOperatingRevenue xel:CommercialandIndustrialCustomers xel:RetailDistribution0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

xel:OtherCustomers, xel:RetailDistribution


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value3432333632303336323334363534373433
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.42.62.62.62.82.42.62.52.52.42.62.42.72.62.52.62.4
Percentage of RegulatedAndUnregulatedOperatingRevenue1.10.91.11.11.21.11.21.21.21.11.21.21.31.21.21.31.2
Percentage of RegulatedAndUnregulatedOperatingRevenue xel:OtherCustomers xel:RetailDistribution0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

xel:ResidentialCustomers, xel:RetailDistribution


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value102411271048109789510429999998161231999101684410869598261067
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax72.491.782.178.377.683.077.369.062.987.774.969.165.381.963.562.078.9
Percentage of RegulatedAndUnregulatedOperatingRevenue33.431.835.634.534.637.135.733.231.739.234.733.331.836.831.832.538.1
Percentage of RegulatedAndUnregulatedOperatingRevenue xel:ResidentialCustomers xel:RetailDistribution0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:MajorCustomers, us-gaap:ProductOrService, us-gaap:StatementBusinessSegments

xel:CommercialandIndustrialCustomers, xel:RetailDistribution, us-gaap:AllOtherSegments


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value6.09.07.05.06.09.08.06.06.09.08.05.05.07.06.04.09.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.40.70.50.40.50.70.60.40.50.60.60.30.40.50.40.30.7
Percentage of RegulatedAndUnregulatedOperatingRevenue0.20.30.20.20.20.30.30.20.20.30.30.20.20.20.20.20.3
Percentage of RegulatedAndUnregulatedOperatingRevenue xel:CommercialandIndustrialCustomers xel:RetailDistribution us-gaap:AllOtherSegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

xel:CommercialandIndustrialCustomers, xel:RetailDistribution, xel:RegulatedElectric


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value12821033111513401075106611201383120111401148140812061112144512431148
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax90.784.187.495.693.284.986.795.692.681.286.195.793.383.995.793.384.9
Percentage of RegulatedAndUnregulatedOperatingRevenue41.829.237.842.141.637.940.045.946.636.339.946.245.437.747.948.940.9
Percentage of RegulatedAndUnregulatedOperatingRevenue xel:CommercialandIndustrialCustomers xel:RetailDistribution xel:RegulatedElectric0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

xel:CommercialandIndustrialCustomers, xel:RetailDistribution, xel:RegulatedNaturalGas


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value1261871545673180164589025517758822075985195
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.915.212.14.06.314.312.74.06.918.213.33.96.315.63.96.414.4
Percentage of RegulatedAndUnregulatedOperatingRevenue4.15.35.21.82.86.45.91.93.58.16.11.93.17.02.03.37.0
Percentage of RegulatedAndUnregulatedOperatingRevenue xel:CommercialandIndustrialCustomers xel:RetailDistribution xel:RegulatedNaturalGas0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

xel:OtherCustomers, xel:RetailDistribution, us-gaap:AllOtherSegments


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value2.02.02.02.01.01.01.01.01.01.01.01.02.01.01.01.01.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.20.20.10.10.10.10.10.10.10.10.10.20.10.10.10.1
Percentage of RegulatedAndUnregulatedOperatingRevenue0.10.10.10.10.00.00.00.00.00.00.00.00.10.00.00.00.0
Percentage of RegulatedAndUnregulatedOperatingRevenue xel:OtherCustomers xel:RetailDistribution us-gaap:AllOtherSegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

xel:OtherCustomers, xel:RetailDistribution, xel:RegulatedElectric


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value3230313431293235313233353333363332
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.32.42.42.42.72.32.52.42.42.32.52.42.62.52.42.52.4
Percentage of RegulatedAndUnregulatedOperatingRevenue1.00.81.11.11.21.01.11.21.21.01.11.11.21.11.21.31.1
Percentage of RegulatedAndUnregulatedOperatingRevenue xel:OtherCustomers xel:RetailDistribution xel:RegulatedElectric0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

xel:ResidentialCustomers, xel:RetailDistribution, us-gaap:AllOtherSegments


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value1110.010.01110.0111210.010.09.010.010.09.09.010.09.08.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.80.80.80.80.90.90.90.70.80.60.80.70.70.70.70.70.6
Percentage of RegulatedAndUnregulatedOperatingRevenue0.40.30.30.30.40.40.40.30.40.30.30.30.30.30.30.40.3
Percentage of RegulatedAndUnregulatedOperatingRevenue xel:ResidentialCustomers xel:RetailDistribution us-gaap:AllOtherSegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

xel:ResidentialCustomers, xel:RetailDistribution, xel:RegulatedElectric


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value756733710962718676661865624727664890678687835654685
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax53.559.655.668.762.253.951.259.848.151.849.860.552.451.855.349.150.7
Percentage of RegulatedAndUnregulatedOperatingRevenue24.620.724.130.227.824.023.628.724.223.123.129.225.523.327.725.724.4
Percentage of RegulatedAndUnregulatedOperatingRevenue xel:ResidentialCustomers xel:RetailDistribution xel:RegulatedElectric0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

xel:ResidentialCustomers, xel:RetailDistribution, xel:RegulatedNaturalGas


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value257384328124167355326124182495325116157390114163374
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax18.231.225.78.914.528.325.28.614.035.324.47.912.129.47.512.227.7
Percentage of RegulatedAndUnregulatedOperatingRevenue8.410.811.13.96.512.611.74.17.115.811.33.85.913.23.86.413.3
Percentage of RegulatedAndUnregulatedOperatingRevenue xel:ResidentialCustomers xel:RetailDistribution xel:RegulatedNaturalGas0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService

us-gaap:Product


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-30
Value291633092769296324412674265428752463304027352915254528242887
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax206.2269.2217.0211.5211.5213.1205.4198.7189.9216.5205.2198.2196.8213.0191.2
Percentage of RegulatedAndUnregulatedOperatingRevenue95.093.494.093.194.495.194.995.495.696.895.095.695.795.795.7
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:Product0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

xel:OtherServices


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value6232694547494337375242424767515050
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.42.65.43.24.13.93.32.62.93.73.22.93.65.13.43.83.7
Percentage of RegulatedAndUnregulatedOperatingRevenue2.00.92.31.41.81.71.51.21.41.71.51.41.82.31.72.01.8
Percentage of RegulatedAndUnregulatedOperatingRevenue xel:OtherServices0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

xel:RetailDistribution


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value24722388235725342081232723242482214526682366252321722446250621922452
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax174.8194.3184.7180.9180.3185.4179.9171.5165.4190.0177.5171.5168.0184.5166.0164.6181.4
Percentage of RegulatedAndUnregulatedOperatingRevenue80.667.480.079.680.582.883.182.483.284.982.282.881.782.983.186.387.4
Percentage of RegulatedAndUnregulatedOperatingRevenue xel:RetailDistribution0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

xel:TransmissionServices


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value14814613715715313298151127131125143132123136126121
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.511.910.711.213.310.57.610.49.89.39.49.710.29.39.09.58.9
Percentage of RegulatedAndUnregulatedOperatingRevenue4.84.14.64.95.94.73.55.04.94.24.34.75.04.24.55.04.3
Percentage of RegulatedAndUnregulatedOperatingRevenue xel:TransmissionServices0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

xel:WholesaleDistribution


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value234743206227160166189205154189202207194188194172181
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.560.516.116.213.913.214.614.211.913.515.214.115.014.212.812.913.4
Percentage of RegulatedAndUnregulatedOperatingRevenue7.621.07.07.16.25.96.86.86.06.07.06.87.36.46.46.86.5
Percentage of RegulatedAndUnregulatedOperatingRevenue xel:WholesaleDistribution0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService, us-gaap:StatementBusinessSegments

us-gaap:Product, us-gaap:AllOtherSegments


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-30
Value192119181721211717191916161717
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.31.71.51.31.51.71.61.21.31.41.41.11.21.31.1
Percentage of RegulatedAndUnregulatedOperatingRevenue0.60.60.60.60.70.70.80.60.70.60.70.50.60.60.6
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:Product us-gaap:AllOtherSegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Product, xel:RegulatedElectric


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-30
Value247226982217273721582086210726522148223721902700226721822677
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax174.8219.5173.7195.4187.0166.2163.1183.3165.6159.3164.3183.5175.3164.6177.3
Percentage of RegulatedAndUnregulatedOperatingRevenue80.676.275.286.083.474.275.388.083.471.276.088.685.373.988.7
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:Product xel:RegulatedElectric0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Product, xel:RegulatedNaturalGas


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-30
Value425590533208266567526206298784526199262625193
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax30.148.041.814.823.145.240.714.223.055.839.513.520.347.112.8
Percentage of RegulatedAndUnregulatedOperatingRevenue13.916.718.16.510.320.218.86.811.625.018.36.59.921.26.4
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:Product xel:RegulatedNaturalGas0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

xel:OtherServices, xel:RegulatedElectric


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value2013181721177.013111818172439312725
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.41.11.41.21.81.40.50.90.81.31.41.21.92.92.12.01.8
Percentage of RegulatedAndUnregulatedOperatingRevenue0.70.40.60.50.80.60.30.40.40.60.60.60.91.31.01.10.9
Percentage of RegulatedAndUnregulatedOperatingRevenue xel:OtherServices xel:RegulatedElectric0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

xel:OtherServices, xel:RegulatedNaturalGas


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value4219512826323624263424252328202325
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.01.54.02.02.32.52.81.72.02.41.81.71.82.11.31.71.8
Percentage of RegulatedAndUnregulatedOperatingRevenue1.40.51.70.91.01.11.30.81.01.10.80.80.90.90.70.90.9
Percentage of RegulatedAndUnregulatedOperatingRevenue xel:OtherServices xel:RegulatedNaturalGas0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

xel:RetailDistribution, us-gaap:AllOtherSegments


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value1921191817212117171919161617171418
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.31.71.51.31.51.71.61.21.31.41.41.11.21.31.11.11.3
Percentage of RegulatedAndUnregulatedOperatingRevenue0.60.60.60.60.70.70.80.60.70.60.70.50.60.60.60.60.6
Percentage of RegulatedAndUnregulatedOperatingRevenue xel:RetailDistribution us-gaap:AllOtherSegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

xel:RetailDistribution, xel:RegulatedElectric


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value20701796185623361824177118132283185618991845233319171832231619301865
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax146.4146.1145.5166.7158.1141.1140.3157.8143.1135.3138.4158.6148.3138.2153.4144.9137.9
Percentage of RegulatedAndUnregulatedOperatingRevenue67.550.763.073.470.563.064.875.872.060.564.176.572.162.176.876.066.5
Percentage of RegulatedAndUnregulatedOperatingRevenue xel:RetailDistribution xel:RegulatedElectric0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

xel:RetailDistribution, xel:RegulatedNaturalGas


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value383571482180240535490182272750502174239597173248569
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax27.146.537.812.820.842.637.912.621.053.437.711.818.545.011.518.642.1
Percentage of RegulatedAndUnregulatedOperatingRevenue12.516.116.45.79.319.017.56.010.623.917.45.79.020.25.79.820.3
Percentage of RegulatedAndUnregulatedOperatingRevenue xel:RetailDistribution xel:RegulatedNaturalGas0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

xel:TransmissionServices, xel:RegulatedElectric


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value14814613715715313298151127131125143132123136126121
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.511.910.711.213.310.57.610.49.89.39.49.710.29.39.09.58.9
Percentage of RegulatedAndUnregulatedOperatingRevenue4.84.14.64.95.94.73.55.04.94.24.34.75.04.24.55.04.3
Percentage of RegulatedAndUnregulatedOperatingRevenue xel:TransmissionServices xel:RegulatedElectric0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

xel:WholesaleDistribution, xel:RegulatedElectric


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value234743206227160166189205154189202207194188194172181
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.560.516.116.213.913.214.614.211.913.515.214.115.014.212.812.913.4
Percentage of RegulatedAndUnregulatedOperatingRevenue7.621.07.07.16.25.96.86.86.06.07.06.87.36.46.46.86.5
Percentage of RegulatedAndUnregulatedOperatingRevenue xel:WholesaleDistribution xel:RegulatedElectric0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Revenues

us-gaap:Revenues us-gaap:ConsolidationItems

us-gaap:Revenues

us-gaap:OperatingSegments


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value3068354129473182258628112798301325773141288030482658295127953016264429462794304024992772264529012515296229282869268532022730282225782782255127242274
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0104.1105.1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:OperatingSegments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.099.9100.0100.0100.099.9100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Revenues us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, us-gaap:AllOtherSegments


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value22242122202524202022221918192019172119181621191717212116182120171721191716
Percentage of Revenues0.70.70.70.70.80.90.90.70.80.70.80.60.70.60.70.60.60.70.70.60.70.80.70.60.70.70.70.60.70.70.70.60.70.80.80.60.7
Percentage of RegulatedAndUnregulatedOperatingRevenue0.70.70.70.70.80.90.90.70.80.70.80.60.70.60.70.60.70.80.70.60.70.80.70.60.70.70.70.60.70.70.70.60.70.80.80.60.7
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:OperatingSegments us-gaap:AllOtherSegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, xel:RegulatedElectric


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value2597287023722941228622032230277122492325230028022348227022552783233822992290279922242185217026672213222422502616229723012122259922202092201025322037
Percentage of Revenues84.681.180.592.488.478.479.792.087.374.079.991.988.376.980.792.388.478.082.092.189.078.882.091.988.075.176.891.285.671.977.792.186.175.278.893.089.6
Percentage of RegulatedAndUnregulatedOperatingRevenue84.681.180.592.488.478.479.792.087.374.079.991.988.376.980.792.392.082.082.092.189.078.882.091.988.075.176.891.285.671.977.792.186.175.278.893.089.6
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:OperatingSegments xel:RegulatedElectric0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, xel:RegulatedNaturalGas


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value449647554219280583544222308794558227292662520214289625484221258565455216284715657236369879588205341669520174221
Percentage of Revenues14.618.318.86.910.820.719.47.412.025.319.47.411.022.418.67.111.021.217.37.310.420.417.27.411.324.222.48.213.727.521.57.313.324.120.46.49.7
Percentage of RegulatedAndUnregulatedOperatingRevenue14.618.318.86.910.820.719.47.412.025.319.47.411.022.418.67.111.422.317.37.310.420.417.27.411.324.222.48.213.727.521.57.313.324.120.46.49.7
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:OperatingSegments xel:RegulatedNaturalGas0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Unregulated Operating Revenue

us-gaap:UnregulatedOperatingRevenue

us-gaap:UnregulatedOperatingRevenue


Unregulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value222421222025242020222219
Percentage of UnregulatedOperatingRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue0.70.70.70.70.80.90.90.70.80.70.80.6

us-gaap:UnregulatedOperatingRevenue us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, us-gaap:AllOtherSegments


Unregulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value222421222025242020222219
Percentage of UnregulatedOperatingRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue0.70.70.70.70.80.90.90.70.80.70.80.6
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:OperatingSegments us-gaap:AllOtherSegments0.00.00.00.00.00.00.00.00.00.00.00.0

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value5677956511539575370853456511335044850240485844785045987448354424043159430304246841860412854115540324394903906939053380293726836878369573536334717341983390733126322663158731140310572982029453294972853728003274662738725305
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidatedEntities

srt:ParentCompany


Assetsus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-31
Value19586179551632015339
Percentage of Assets36.335.635.535.6
Percentage of Assets36.335.635.535.6
Percentage of Assets srt:ParentCompany100.0100.0100.0100.0

us-gaap:VariableInterestEntityPrimaryBeneficiary


Assetsus-gaap:
Period End2020-12-312019-12-31
Value4649
Percentage of Assets0.10.1
Percentage of Assets0.10.1
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary100.0100.0

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value5677956511539575370853456511335044850240485844785045987448354424043159430304246841860412854115540324394903906939053380293726836878369573536334717341983390733126322663158731140310572982029453294972853728003274662738725305
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilitiesAndStockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Liabilities
Period End2020-12-312019-12-312018-12-312017-12-31
Value19586179551632015339
Percentage of LiabilitiesAndStockholdersEquity36.335.635.535.6
Percentage of Assets36.335.635.535.6
Percentage of Assets srt:ParentCompany100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value147921470014575137771338513302132391314112366123291222212165116501156111455114391112311070110201098710703106711060010544102691021410214101549920974795659547930091558874
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets26.126.027.025.725.026.026.226.225.525.826.627.126.326.826.626.926.626.826.827.227.127.327.127.727.627.727.628.728.628.528.228.828.829.028.5

us-gaap:StockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Stockholders
Period End2020-12-312019-12-312018-12-312017-12-31
Value14575132391222211455
Percentage of StockholdersEquity100.0100.0100.0100.0
Percentage of Assets27.026.226.626.6
Percentage of Assets srt:ParentCompany74.473.774.974.7

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value-55.0-56.0-56.0-57.0-58.0-60.0-61.0-59.0-60.0-61.0-64.0-63.0-65.0-0.066-67.0-56.427-57.409-58.365-59.313-53.047-53.925-54.79-55.001-47.978-48.862-49.745-50.621
Percentage of StockholdersEquity-0.4-0.4-0.4-0.4-0.4-0.5-0.5-0.4-0.5-0.5-0.5-0.5-0.6-0.0-0.6-0.5-0.5-0.5-0.5-0.5-0.5-0.5-0.5-0.5-0.5-0.5-0.5
Percentage of Assets-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.0-0.2-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value-80.0-82.0-85.0-86.0-87.0-88.0-80.0-83.0-75.0-66.0-60.0-56.0-57.0-0.058-58.0-48.493-49.497-50.326-51.151-52.024-52.98-53.928-54.862-55.772-56.436-57.054-57.628
Percentage of StockholdersEquity-0.5-0.6-0.6-0.6-0.6-0.7-0.6-0.6-0.6-0.5-0.5-0.5-0.5-0.0-0.5-0.4-0.4-0.5-0.5-0.5-0.5-0.5-0.5-0.5-0.5-0.6-0.6
Percentage of Assets-0.1-0.1-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.1-0.1-0.1-0.1-0.0-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.2-0.2-0.2
Percentage of Assets us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value-135.0-138.0-141.0-143.0-145.0-148.0-141.0-142.0-135.0-127.0-124.0-119.0-122.0-0.124-125.0-104.809-106.795-108.581-110.354-104.961-106.795-108.608-109.753-103.639-105.186-106.688-108.139
Percentage of StockholdersEquity-0.9-0.9-1.0-1.0-1.1-1.1-1.1-1.1-1.1-1.0-1.0-1.0-1.0-0.0-1.1-0.9-1.0-1.0-1.0-1.0-1.0-1.0-1.0-1.0-1.0-1.0-1.1
Percentage of Assets-0.2-0.2-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.0-0.3-0.2-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets Current

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value41474315327538374390298331133600293929093094300330562782297328982756263328423076270427322910334430483057336431963123312932183120281827042625337025602542298228612478251427322976
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets7.37.66.17.18.25.86.27.26.06.16.76.76.96.46.96.86.66.46.97.66.87.07.58.88.28.39.19.09.09.29.59.48.78.68.410.98.68.610.110.08.99.210.011.8

us-gaap:AssetsCurrent us-gaap:ConsolidatedEntities

srt:ParentCompany


Assets
Period End2020-12-312019-12-312018-12-312017-12-31
Value444452311304
Percentage of AssetsCurrent13.614.510.110.2
Percentage of Assets0.80.90.70.7
Percentage of Assets srt:ParentCompany2.32.51.92.0

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value53810391298851625244248864353941472133321168316761738435376101844041351337913799132107101581128274763996019410194108223748511525957
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.91.80.21.63.00.50.51.70.70.20.30.50.80.30.20.40.10.20.20.90.20.30.21.10.40.40.20.40.30.40.30.30.20.40.32.40.20.30.20.70.40.30.40.00.00.00.50.00.0

us-gaap:CashAndCashEquivalentsAtCarryingValue us-gaap:ConsolidatedEntities

srt:ParentCompany


Cash
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value14701.01.00.00.00.0
Percentage of CashAndCashEquivalentsAtCarryingValue10.928.20.71.20.00.00.0
Percentage of Assets0.00.10.00.00.00.00.0
Percentage of Assets srt:ParentCompany0.10.40.00.00.00.00.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value538103912988516342442488643539414783
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.91.80.21.63.10.50.51.70.70.20.30.2

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents us-gaap:ConsolidatedEntities

srt:ParentCompany


Cash
Period End2020-12-312019-12-312018-12-312017-12-31
Value14701.01.0
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents10.928.20.71.2
Percentage of Assets0.00.10.00.0
Percentage of Assets srt:ParentCompany0.10.40.00.0

Accounts Receivable Net Current

us-gaap:AccountsReceivableNetCurrent

us-gaap:AccountsReceivableNetCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value948959916899799839837821737974860856808868797807759781776754689729724741676826826760742885744786719789718704645718753752679718
Percentage of AccountsReceivableNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.71.71.71.71.51.61.71.61.52.01.91.91.82.01.91.91.81.91.91.91.71.91.91.91.82.22.22.12.12.62.22.42.22.52.32.32.22.42.62.62.42.6

Inventory Net

us-gaap:InventoryNet

us-gaap:InventoryNet


Inventory
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value500469535512487488544544483445548528511492610616542519604614526520608644532505597634501436576604494447535562473474618608484442560566
Percentage of InventoryNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.90.81.01.00.91.01.11.11.00.91.21.21.21.11.41.51.31.31.51.51.31.31.61.71.41.41.61.81.41.31.71.81.51.41.71.81.61.62.12.11.71.62.02.2

Other Assets Current

us-gaap:OtherAssetsCurrent us-gaap:ConsolidatedEntities

us-gaap:OtherAssetsCurrent

srt:ParentCompany


Other
Period End2020-12-312019-12-312018-12-312017-12-31
Value6.0121.01.0
Percentage of OtherAssetsCurrent100.0100.0100.0100.0
Percentage of Assets0.00.00.00.0
Percentage of Assets srt:ParentCompany0.00.10.00.0

Prepaid Expense And Other Assets Current

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:PrepaidExpenseAndOtherAssetsCurrent


Prepaid
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value221244250232208230185193175191154157164188183143135145138122126154155142141155171270270295252236264246171174195192121191186193
Percentage of PrepaidExpenseAndOtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.40.50.40.40.40.40.40.40.40.30.40.40.40.40.30.30.40.30.30.30.40.40.40.40.40.50.80.80.90.70.70.80.80.60.60.70.70.40.70.70.7

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:PropertyPlantAndEquipmentGross


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value6118160284592965938357897571615584454871535455267152249510325041349580489274853247824472944683246108455194486244413431774249441928415354034339627389603838637468368103609835511350703450434009337143290132508318043143528983
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets107.8106.7109.9110.6108.3111.8110.7109.2110.2110.1113.6113.8114.0114.9113.7114.3114.2114.6113.8114.3115.3114.8113.7113.5114.0113.7112.4114.1114.1113.9113.2113.1114.1114.3114.0112.9115.7115.5114.3115.3116.1115.8114.8114.5

us-gaap:PropertyPlantAndEquipmentGross us-gaap:PropertyPlantAndEquipmentByType

us-gaap:ConstructionInProgress


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value185118771877326530602756232926291745228720913029265823392087186115711596137318441687148612561679209220102005236425022672237123912298213617571681148413151085116911431186
Percentage of PropertyPlantAndEquipmentGross3.03.13.25.55.34.84.24.83.34.34.05.95.34.74.33.83.33.42.94.03.73.32.83.94.94.84.85.96.36.96.26.46.25.94.94.84.33.93.23.63.53.8
Percentage of Assets3.33.33.56.15.75.44.65.23.64.84.56.86.05.44.94.43.83.93.34.64.33.83.24.45.65.55.46.77.27.87.07.27.16.85.65.45.04.53.74.14.14.3
Percentage of Assets us-gaap:ConstructionInProgress0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ElectricGenerationEquipment


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value488614800847104465314541344544443554330143006417484147239530397453934839016390673881038412382203733536990366043646435022339963354133203321223136030562303412955029017284712828528032277172739327254264372605924993
Percentage of PropertyPlantAndEquipmentGross79.979.679.478.478.477.979.478.980.379.379.477.578.879.479.780.581.281.281.681.081.381.682.181.180.080.079.979.679.178.479.078.978.878.979.679.980.380.580.880.480.279.5
Percentage of Assets86.185.087.386.685.087.187.986.288.587.290.288.289.891.290.792.092.793.092.992.693.793.793.492.191.291.089.890.890.389.489.589.289.990.190.890.392.993.092.492.693.191.3
Percentage of Assets us-gaap:ElectricGenerationEquipment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:GasTransmissionEquipment


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value731572187135689967476653656064146289614862106036595558555800556354655365531751495065501749444818472646924643429442114156408639423903387138363774373537003676357435203463
Percentage of PropertyPlantAndEquipmentGross12.012.012.011.611.711.611.711.711.711.711.911.811.811.811.911.511.411.311.411.211.111.211.111.211.111.211.210.610.610.710.610.510.610.710.810.810.810.910.910.910.811.0
Percentage of Assets12.912.813.212.812.613.013.012.812.912.813.513.513.513.613.513.113.113.012.912.812.812.812.712.712.712.712.612.112.112.212.111.912.112.312.312.212.512.612.512.512.612.6
Percentage of Assets us-gaap:GasTransmissionEquipment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NuclearFuel


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value305730472970293029252913290928872859285127712717271227012697266826602652257124692461245024472414240523962347225022002193218621572142210820902075208720621939192819681837
Percentage of PropertyPlantAndEquipmentGross5.05.15.04.95.15.15.25.35.35.45.35.35.45.45.55.55.65.65.55.45.45.55.55.65.75.75.75.65.65.65.75.85.85.85.95.96.16.15.85.96.15.8
Percentage of Assets5.45.45.55.55.55.75.85.75.96.06.06.16.16.36.36.36.46.46.26.16.26.36.36.46.56.56.46.46.36.46.46.56.66.76.76.77.07.06.66.87.06.7
Percentage of Assets us-gaap:NuclearFuel0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OtherCapitalizedPropertyPlantAndEquipment


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value252425272503240123852991234122512215218221542100204520272013202819591897188817411746172017091615162316191611148314671477148514671475147814801476145414841546153615861555
Percentage of PropertyPlantAndEquipmentGross4.14.24.24.04.15.24.24.14.14.14.14.14.14.14.14.24.14.04.03.83.83.83.83.73.83.93.93.73.73.83.93.94.04.14.24.24.24.44.64.74.94.9
Percentage of Assets4.44.54.64.54.55.84.64.54.64.64.74.74.64.74.74.84.74.64.64.34.44.44.44.24.44.44.44.24.24.34.44.44.64.74.84.84.95.05.25.45.75.7
Percentage of Assets us-gaap:OtherCapitalizedPropertyPlantAndEquipment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

xel:PlantToBeRetired


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value63065467728729221725927629030632233710.01111111722313629343842556471778592101115115141152105112115151182199236
Percentage of PropertyPlantAndEquipmentGross1.01.11.10.50.50.40.50.50.50.60.60.70.00.00.00.00.00.00.10.10.10.10.10.10.10.20.20.20.20.20.30.30.30.40.40.30.30.30.40.60.60.8
Percentage of Assets1.11.21.30.50.50.40.50.50.60.60.70.80.00.00.00.00.00.10.10.10.10.10.10.10.10.20.20.20.20.30.30.30.40.40.50.30.40.40.50.60.70.9
Percentage of Assets xel:PlantToBeRetired0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1738217060166571745617097167301673516549162781596115659154831547915276150001498214703145761438114218140351379013591137241354313373131681302812854127411260812462123441221612048120231185211731116581148411378112231106810776
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets30.630.230.932.532.032.733.232.933.533.434.134.535.035.434.935.335.135.334.935.335.535.334.836.136.336.335.636.837.037.337.237.638.338.738.738.739.739.839.540.240.640.940.442.6

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment us-gaap:PropertyPlantAndEquipmentByType

us-gaap:NuclearFuel


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value271526892659263026012568253525062475244724172387235723262295226822372211218021532121208920632039200619851957193419031871184218211794177217441721169116671641161615841541
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment15.615.816.015.115.215.315.115.115.215.315.415.415.215.215.315.115.215.215.215.115.115.215.214.914.814.814.914.914.814.714.614.614.514.514.514.314.314.214.114.113.913.9
Percentage of Assets4.84.84.94.94.95.05.05.05.15.15.35.35.35.45.35.35.35.45.35.35.45.35.35.45.45.45.35.55.55.55.45.55.65.65.65.55.75.75.65.75.75.6
Percentage of Assets us-gaap:NuclearFuel0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value4414143582429504222741124407763948338703376513711436944358793528934679343293394933543331583284132206318233143331205298282935028966287562763027070265412612225342248132421923809234012304722672223532172921513209082066318508
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets77.777.179.678.676.979.778.377.077.577.680.380.079.880.479.879.980.180.379.879.980.680.579.978.478.878.577.878.178.077.677.076.576.976.776.575.377.377.075.876.176.876.175.473.1

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value13901440149015341229126016721718176316190.0
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets2.42.52.82.92.32.53.33.43.63.40.0

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

us-gaap:OtherAssetsNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value3954093793481019516492478490499272272273280278259255247248673832124182176174175177173170217178184177200203193192155164163168180162
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.70.70.70.61.91.01.01.01.01.00.60.60.60.60.60.60.60.60.60.20.10.10.30.50.50.50.50.50.50.50.60.50.60.60.60.70.60.70.50.60.60.60.70.6

us-gaap:OtherAssetsNoncurrent us-gaap:ConsolidatedEntities

srt:ParentCompany


Other
Period End2020-12-312019-12-312018-12-312017-12-31
Value406044103
Percentage of OtherAssetsNoncurrent10.612.216.237.1
Percentage of Assets0.10.10.10.2
Percentage of Assets srt:ParentCompany0.20.30.30.7

Accounts Payable Current

us-gaap:AccountsPayableCurrent

us-gaap:AccountsPayableCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value12731213123716021188996129412581057115412371189109210271243992973861104491692180996092483089811731061967106112619659989329598858717869028379578489791083
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.22.12.33.02.21.92.62.52.22.42.72.72.52.42.92.32.32.12.52.32.32.12.52.42.22.43.23.02.83.13.72.93.13.03.12.82.92.73.12.93.43.13.64.3

Dividends Payable Current

us-gaap:DividendsPayableCurrent

us-gaap:DividendsPayableCurrent


Dividends
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value246246231226226226212212209208195194193193183182182182172172172172162162162162151151151150139139139133131131131126126127127123122113
Percentage of DividendsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.50.40.40.4

us-gaap:DividendsPayableCurrent us-gaap:ConsolidatedEntities

srt:ParentCompany


Dividends
Period End2020-12-312019-12-312018-12-312017-12-31
Value231212195183
Percentage of DividendsPayableCurrent100.0100.0100.0100.0
Percentage of Assets0.40.40.40.4
Percentage of Assets srt:ParentCompany1.21.21.21.2

Liabilities Current

us-gaap:LiabilitiesCurrent

us-gaap:LiabilitiesCurrent


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value49504877423943935473583945685021506044244460383841784122408833403690370732473453350631884058308535373774406434703059346736542839269625262937316038313708358826532638248425363089
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets8.78.67.98.210.211.49.110.010.49.29.78.69.49.69.57.98.89.07.98.68.98.210.48.19.510.211.09.88.810.110.88.68.48.09.410.212.812.612.29.39.49.09.312.2

us-gaap:LiabilitiesCurrent us-gaap:ConsolidatedEntities

srt:ParentCompany


Liabilities
Period End2020-12-312019-12-312018-12-312017-12-31
Value652745693977
Percentage of LiabilitiesCurrent15.416.315.523.9
Percentage of Assets1.21.51.52.3
Percentage of Assets srt:ParentCompany3.34.14.26.4

Long Term Debt Current

us-gaap:LongTermDebtCurrent dei:LegalEntity

us-gaap:LongTermDebtCurrent

xel:NSPWisconsin


Long
Period End2020-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value191511.1231.1311.2350.1071.246
Percentage of LongTermDebtCurrent100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.40.00.00.00.00.0
Percentage of Assets xel:NSPWisconsin0.00.00.00.00.00.00.0

xel:OtherSubsidiariesDomain


Long
Period End2020-12-312019-12-312018-12-31
Value2.02.01.0
Percentage of LongTermDebtCurrent10.50.00.0
Percentage of Assets0.00.00.0
Percentage of Assets xel:OtherSubsidiariesDomain0.00.00.0

xel:XCELENERGYINC


Long
Period End2020-12-31
Value400
Percentage of LongTermDebtCurrent2105.3
Percentage of Assets0.7
Percentage of Assets xel:XCELENERGYINC0.0

us-gaap:LongTermDebtCurrent us-gaap:ConsolidatedEntities

srt:ParentCompany


Long
Period End2020-12-312018-12-312017-12-31
Value4000.00.0
Percentage of LongTermDebtCurrent2105.30.00.0
Percentage of Assets0.70.00.0
Percentage of Assets srt:ParentCompany2.00.00.0

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OperatingLeaseLiabilityCurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value220221214208149143194
Percentage of OperatingLeaseLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.40.40.40.30.30.4

Other Liabilities Current

us-gaap:OtherLiabilitiesCurrent

us-gaap:OtherLiabilitiesCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value409370407416396379662614614549463435441429501486439393503457448392490561499463475396341333377445288253287302338348381328278248276227
Percentage of OtherLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.70.70.80.80.70.71.31.21.31.11.01.01.01.01.21.11.11.01.21.11.11.01.31.51.31.31.31.11.01.01.11.30.90.80.91.01.11.21.31.21.00.91.00.9

us-gaap:OtherLiabilitiesCurrent us-gaap:ConsolidatedEntities

srt:ParentCompany


Other
Period End2020-12-312019-12-312018-12-312017-12-31
Value213310.011
Percentage of OtherLiabilitiesCurrent5.25.02.22.2
Percentage of Assets0.00.10.00.0
Percentage of Assets srt:ParentCompany0.10.20.10.1

Taxes Payable Current

us-gaap:TaxesPayableCurrent

us-gaap:TaxesPayableCurrent


Taxes
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value428684578504343553466443342555450428316544448427339544457422330525438379280480396371269461378335242415334264215359289250189312254257
Percentage of TaxesPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.81.21.10.90.61.10.90.90.71.21.01.00.71.31.01.00.81.31.11.00.81.31.11.00.81.31.11.10.81.31.11.00.81.31.10.90.71.21.00.90.71.10.91.0

Long Term Debt

us-gaap:LongTermDebt

us-gaap:LongTermDebt


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value214972149120066203612056418112181091767216209
Percentage of LongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets37.938.037.237.938.535.435.935.235.2

us-gaap:LongTermDebt dei:LegalEntity

xel:NSPWisconsin


Long
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value887808807761663667568468468
Percentage of LongTermDebt4.44.55.00.00.00.00.00.00.0
Percentage of Assets1.61.61.81.81.61.71.51.41.5
Percentage of Assets xel:NSPWisconsin0.00.00.00.00.00.00.00.00.0

xel:NspMinnesota


Long
Period End2020-12-312019-12-312018-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value59045221493748434534418838883488333833373013
Percentage of LongTermDebt29.428.830.50.00.00.00.00.00.00.00.0
Percentage of Assets10.910.310.711.811.611.311.511.211.312.211.9
Percentage of Assets xel:NspMinnesota0.00.00.00.00.00.00.00.00.00.00.0

xel:OtherSubsidiariesDomain


Long
Period End2020-12-312019-12-31
Value2526
Percentage of LongTermDebt0.10.1
Percentage of Assets0.00.1
Percentage of Assets xel:OtherSubsidiariesDomain0.00.0

xel:Psco


Long
Period End2020-12-312019-12-312010-12-312009-12-31
Value5724498532352828
Percentage of LongTermDebt28.527.50.00.0
Percentage of Assets10.69.911.811.2
Percentage of Assets xel:Psco0.00.00.00.0

xel:Sps


Long
Period End2020-12-312019-12-312018-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value27642420212616351550134911991103993897922
Percentage of LongTermDebt13.813.413.10.00.00.00.00.00.00.00.0
Percentage of Assets5.14.84.64.04.03.73.53.53.43.33.6
Percentage of Assets xel:Sps0.00.00.00.00.00.00.00.00.00.00.0

xel:XcelEnergy


Long
Period End2020-12-312019-12-31
Value43413947
Percentage of LongTermDebt21.621.8
Percentage of Assets8.07.8
Percentage of Assets xel:XcelEnergy0.00.0

Long Term Debt Noncurrent

us-gaap:LongTermDebtNoncurrent us-gaap:ConsolidatedEntities

us-gaap:LongTermDebtNoncurrent

srt:ParentCompany


Long
Period End2020-12-312019-12-312018-12-312017-12-31
Value4342394833732878
Percentage of LongTermDebtNoncurrent100.0100.0100.0100.0
Percentage of Assets8.07.87.36.7
Percentage of Assets srt:ParentCompany22.222.020.718.8

Deferred Finance Costs Noncurrent Net

us-gaap:DeferredFinanceCostsNoncurrentNet

us-gaap:DeferredFinanceCostsNoncurrentNet


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value16714812611910992858385757469
Percentage of DeferredFinanceCostsNoncurrentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.30.30.30.30.30.20.20.20.30.30.30.3

Long Term Debt And Capital Lease Obligations

us-gaap:LongTermDebtAndCapitalLeaseObligations

us-gaap:LongTermDebtAndCapitalLeaseObligations


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value21476214701964519960194631701017407168191599616118158031550815311145221452014572140911369614194134021310413148124901269011896114991149911501117521120510910109141081610642101431010587068598884894509263926492637888
Percentage of LongTermDebtAndCapitalLeaseObligations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets37.838.036.437.236.433.334.533.532.933.734.434.634.633.633.734.333.733.234.533.233.233.732.033.431.931.231.132.533.932.832.232.933.533.732.632.529.229.230.033.133.133.733.831.2

Deferred Income Tax Liabilities Net

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredIncomeTaxLiabilitiesNet


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value4807476547464696456944924509
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets8.58.48.88.78.58.88.9

Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent


Pension
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value5215166666516366227858568508389949098848841042984975964111284382581294186385885093665365064276999898897911638108268131001829828824962839
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.90.91.21.21.21.21.61.71.71.82.22.02.02.02.42.32.32.32.72.12.12.12.42.32.32.32.51.81.91.92.33.03.13.13.72.62.82.83.42.93.03.03.53.3

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Pension
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value121113118157155
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent18.214.411.915.113.9
Percentage of Assets0.20.20.30.40.4
Percentage of Assets us-gaap:OtherPostretirementBenefitPlansDefinedBenefit0.00.00.00.00.0

us-gaap:PensionPlansDefinedBenefit


Pension
Period End2020-12-312019-12-312018-12-312017-12-31
Value365517735740
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent54.865.973.971.0
Percentage of Assets0.71.01.61.7
Percentage of Assets us-gaap:PensionPlansDefinedBenefit0.00.00.00.0

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value208225183178185196186186190212206202226143145144225235223277280285261263279286264243237244237239245250229224217219203221225226249211
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.40.30.30.30.40.40.40.40.40.40.50.50.30.30.30.50.60.50.70.70.70.70.70.80.80.70.70.70.70.70.70.80.80.70.70.70.70.70.80.80.80.90.8

us-gaap:OtherLiabilitiesNoncurrent us-gaap:ConsolidatedEntities

srt:ParentCompany


Other
Period End2020-12-312019-12-312018-12-312017-12-31
Value17233229
Percentage of OtherLiabilitiesNoncurrent9.312.415.520.0
Percentage of Assets0.00.00.10.1
Percentage of Assets srt:ParentCompany0.10.10.20.2

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value12361287134413951125116315491598164715290.0
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0
Percentage of Assets2.22.32.52.62.12.33.13.23.43.20.0

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value258267262262234
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0100.0100.0100.0100.0
Percentage of Assets0.50.50.50.50.5

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo us-gaap:PropertyPlantAndEquipmentByType

us-gaap:PropertyPlantAndEquipmentOtherTypes


Lessee
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value3029262526
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo11.610.99.99.511.1
Percentage of Assets0.10.10.10.10.1
Percentage of Assets us-gaap:PropertyPlantAndEquipmentOtherTypes0.00.00.00.00.0

xel:PurchasedPowerAgreements


Lessee
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value228238236237208
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo88.489.190.190.588.9
Percentage of Assets0.40.50.50.50.4
Percentage of Assets xel:PurchasedPowerAgreements0.00.00.00.00.0

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value239253267267239
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0100.0100.0100.0100.0
Percentage of Assets0.40.50.50.50.5

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree us-gaap:PropertyPlantAndEquipmentByType

us-gaap:PropertyPlantAndEquipmentOtherTypes


Lessee
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value2128292429
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree8.811.110.99.012.1
Percentage of Assets0.00.10.10.00.1
Percentage of Assets us-gaap:PropertyPlantAndEquipmentOtherTypes0.00.00.00.00.0

xel:PurchasedPowerAgreements


Lessee
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value218225238243210
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree91.288.989.191.087.9
Percentage of Assets0.40.40.50.50.4
Percentage of Assets xel:PurchasedPowerAgreements0.00.00.00.00.0

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour


Lessee
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value230239253253225
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0100.0100.0100.0100.0
Percentage of Assets0.40.50.50.50.5

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour us-gaap:PropertyPlantAndEquipmentByType

us-gaap:PropertyPlantAndEquipmentOtherTypes


Lessee
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value2125282728
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour9.110.511.110.712.4
Percentage of Assets0.00.00.10.10.1
Percentage of Assets us-gaap:PropertyPlantAndEquipmentOtherTypes0.00.00.00.00.0

xel:PurchasedPowerAgreements


Lessee
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value209214225226197
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour90.989.588.989.387.6
Percentage of Assets0.40.40.40.50.4
Percentage of Assets xel:PurchasedPowerAgreements0.00.00.00.00.0

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value204230239239210
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0100.0100.0100.0100.0
Percentage of Assets0.40.50.50.50.4

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive us-gaap:PropertyPlantAndEquipmentByType

us-gaap:PropertyPlantAndEquipmentOtherTypes


Lessee
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value1522252125
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive7.49.610.58.811.9
Percentage of Assets0.00.00.00.00.1
Percentage of Assets us-gaap:PropertyPlantAndEquipmentOtherTypes0.00.00.00.00.0

xel:PurchasedPowerAgreements


Lessee
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value189208214218185
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive92.690.489.591.288.1
Percentage of Assets0.40.40.40.40.4
Percentage of Assets xel:PurchasedPowerAgreements0.00.00.00.00.0

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive


Lessee
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value655865109510951019
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0100.0100.0100.0100.0
Percentage of Assets1.21.72.22.32.1

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive us-gaap:PropertyPlantAndEquipmentByType

us-gaap:PropertyPlantAndEquipmentOtherTypes


Lessee
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value94115136136136
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive14.413.312.412.413.3
Percentage of Assets0.20.20.30.30.3
Percentage of Assets us-gaap:PropertyPlantAndEquipmentOtherTypes0.00.00.00.00.0

xel:PurchasedPowerAgreements


Lessee
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value561750959959883
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive85.686.787.687.686.7
Percentage of Assets1.01.51.92.01.8
Percentage of Assets xel:PurchasedPowerAgreements0.00.00.00.00.0

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2021-06-302021-03-312020-12-312019-12-312019-09-302019-06-302019-03-31
Value1456150815581743179018361693
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.62.72.93.53.63.83.5

us-gaap:OperatingLeaseLiability us-gaap:IncomeTaxAuthority

xel:NetDeferredTaxLiablility


Operating
Period End2020-12-312019-12-31
Value400449
Percentage of OperatingLeaseLiability25.725.8
Percentage of Assets0.70.9
Percentage of Assets xel:NetDeferredTaxLiablility0.00.0

us-gaap:OperatingLeaseLiability us-gaap:PropertyPlantAndEquipmentByType

us-gaap:PropertyPlantAndEquipmentOtherTypes


Operating
Period End2021-06-302021-03-312020-12-312019-12-312019-09-302019-06-302019-03-31
Value159164168193196190205
Percentage of OperatingLeaseLiability10.910.910.811.110.910.312.1
Percentage of Assets0.30.30.30.40.40.40.4
Percentage of Assets us-gaap:PropertyPlantAndEquipmentOtherTypes0.00.00.00.00.00.00.0

xel:PurchasedPowerAgreements


Operating
Period End2021-06-302021-03-312020-12-312019-12-312019-09-302019-06-302019-03-31
Value1297134413901550159416461488
Percentage of OperatingLeaseLiability89.189.189.288.989.189.787.9
Percentage of Assets2.32.42.63.13.23.43.1
Percentage of Assets xel:PurchasedPowerAgreements0.00.00.00.00.00.00.0

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2021-06-302021-03-312020-12-312019-12-312019-09-302019-06-302019-03-31
Value1728179318592116218122462101
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets3.03.23.44.24.34.64.4

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue us-gaap:PropertyPlantAndEquipmentByType

us-gaap:PropertyPlantAndEquipmentOtherTypes


Lessee
Period End2021-06-302021-03-312020-12-312019-12-312019-09-302019-06-302019-03-31
Value196201207245250245263
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue11.311.211.111.611.510.912.5
Percentage of Assets0.30.40.40.50.50.50.5
Percentage of Assets us-gaap:PropertyPlantAndEquipmentOtherTypes0.00.00.00.00.00.00.0

xel:PurchasedPowerAgreements


Lessee
Period End2021-06-302021-03-312020-12-312019-12-312019-09-302019-06-302019-03-31
Value1532159216521871193120011838
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue88.788.888.988.488.589.187.5
Percentage of Assets2.72.83.13.73.84.13.8
Percentage of Assets xel:PurchasedPowerAgreements0.00.00.00.00.00.00.0

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2021-06-302021-03-312020-12-312019-12-312019-09-302019-06-302019-03-31
Value272285301373391410408
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.50.50.60.70.80.80.9

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount us-gaap:PropertyPlantAndEquipmentByType

us-gaap:PropertyPlantAndEquipmentOtherTypes


Lessee
Period End2021-06-302021-03-312020-12-312019-12-312019-09-302019-06-302019-03-31
Value37373952545558
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount13.613.013.013.913.813.414.2
Percentage of Assets0.10.10.10.10.10.10.1
Percentage of Assets us-gaap:PropertyPlantAndEquipmentOtherTypes0.00.00.00.00.00.00.0

xel:PurchasedPowerAgreements


Lessee
Period End2021-06-302021-03-312020-12-312019-12-312019-09-302019-06-302019-03-31
Value235248262321337355350
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount86.487.087.086.186.286.685.8
Percentage of Assets0.40.40.50.60.70.70.7
Percentage of Assets xel:PurchasedPowerAgreements0.00.00.00.00.00.00.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value147921470014575137771338513302132391314112366123291222212165116501156111455114391112311070110201098710703106711060010544102691021410214101549920974795659547930091558874
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets26.126.027.025.725.026.026.226.225.525.826.627.126.326.826.626.926.626.826.827.227.127.327.127.727.627.727.628.728.628.528.228.828.829.028.5

us-gaap:StockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Stockholders
Period End2020-12-312019-12-312018-12-312017-12-31
Value14575132391222211455
Percentage of StockholdersEquity100.0100.0100.0100.0
Percentage of Assets27.026.226.626.6
Percentage of Assets srt:ParentCompany74.473.774.974.7

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value-55.0-56.0-56.0-57.0-58.0-60.0-61.0-59.0-60.0-61.0-64.0-63.0-65.0-0.066-67.0-56.427-57.409-58.365-59.313-53.047-53.925-54.79-55.001-47.978-48.862-49.745-50.621
Percentage of StockholdersEquity-0.4-0.4-0.4-0.4-0.4-0.5-0.5-0.4-0.5-0.5-0.5-0.5-0.6-0.0-0.6-0.5-0.5-0.5-0.5-0.5-0.5-0.5-0.5-0.5-0.5-0.5-0.5
Percentage of Assets-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.0-0.2-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value-80.0-82.0-85.0-86.0-87.0-88.0-80.0-83.0-75.0-66.0-60.0-56.0-57.0-0.058-58.0-48.493-49.497-50.326-51.151-52.024-52.98-53.928-54.862-55.772-56.436-57.054-57.628
Percentage of StockholdersEquity-0.5-0.6-0.6-0.6-0.6-0.7-0.6-0.6-0.6-0.5-0.5-0.5-0.5-0.0-0.5-0.4-0.4-0.5-0.5-0.5-0.5-0.5-0.5-0.5-0.5-0.6-0.6
Percentage of Assets-0.1-0.1-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.1-0.1-0.1-0.1-0.0-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.2-0.2-0.2
Percentage of Assets us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-31
Value-135.0-138.0-141.0-143.0-145.0-148.0-141.0-142.0-135.0-127.0-124.0-119.0-122.0-0.124-125.0-104.809-106.795-108.581-110.354-104.961-106.795-108.608-109.753-103.639-105.186-106.688-108.139
Percentage of StockholdersEquity-0.9-0.9-1.0-1.0-1.1-1.1-1.1-1.1-1.1-1.0-1.0-1.0-1.0-0.0-1.1-0.9-1.0-1.0-1.0-1.0-1.0-1.0-1.0-1.0-1.0-1.0-1.1
Percentage of Assets-0.2-0.2-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.0-0.3-0.2-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Stockholders Equity Including Portion Attributable To Noncontrolling Interest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value1479214700145751377713385133021323913141123661232912222121651165011561114551143911123110701102010987107031067110600105441026910214102141015499209747956595479300915588748850857385378482843182348181808376057391735572836963
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets26.126.027.025.725.026.026.226.225.525.826.627.126.326.826.626.926.626.826.827.227.127.327.127.727.627.727.628.728.628.528.228.828.829.028.528.528.829.028.829.529.429.829.50.00.00.028.80.0

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value-135.0-138.0-141.0-143.0-145.0-148.0-141.0-142.0-135.0-127.0-124.0-119.0-122.0-124.0-125.0-104.809-106.795-108.581-110.354-104.961-106.795-108.608-109.753-103.639-105.186-106.688-108.139-102.001-103.366-104.82-106.275-109.98-111.835-113.62-112.653-109.6-102.006-67.515-94.035-80.969-50.983-51.847-53.093-50.737-52.085-48.627-49.709-53.669
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-0.9-0.9-1.0-1.0-1.1-1.1-1.1-1.1-1.1-1.0-1.0-1.0-1.0-1.1-1.1-0.9-1.0-1.0-1.0-1.0-1.0-1.0-1.0-1.0-1.0-1.0-1.1-1.0-1.0-1.1-1.1-1.2-1.2-1.2-1.3-1.2-1.2-0.8-1.1-1.0-0.6-0.6-0.7-0.7-0.7-0.7-0.7-0.8
Percentage of Assets-0.2-0.2-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.2-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.4-0.4-0.4-0.3-0.2-0.3-0.3-0.2-0.2-0.20.00.00.0-0.20.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value743574117404669466796659665666366190617361686125592059035898588858815872588158985896588958895873586358445837581557995681561956155595551553535334531652985327528052615241522948174800478447694695
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest50.350.450.848.649.950.150.350.550.150.150.550.350.851.151.551.552.953.153.453.755.155.255.655.757.157.257.157.358.558.358.758.860.260.260.360.362.062.162.862.663.964.164.763.364.965.065.567.4
Percentage of Assets13.113.113.712.512.513.013.213.212.712.913.413.713.413.713.713.914.114.214.314.614.915.115.115.415.715.815.816.416.716.616.617.017.317.517.217.217.818.018.118.518.819.119.10.00.00.018.80.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value134613451344131413131313131113111287128712851283127212721269126912691269126812691269126912681268126712661264126312621252124412441243123612191219121812171216121212111210120511501149114811431134
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest9.19.19.29.59.89.99.910.010.410.410.510.510.911.011.111.111.411.511.511.611.911.912.012.012.312.412.412.412.712.913.013.013.413.513.713.814.214.314.314.414.714.814.915.115.515.615.716.3
Percentage of Assets2.42.42.52.42.52.62.62.62.62.72.82.92.92.92.93.03.03.13.13.13.23.33.23.33.43.43.43.63.63.73.73.83.93.93.93.94.14.14.14.24.34.44.40.00.00.04.50.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value614660825968591255385478541353365024499648934876458045104413438640794036398139243643362035523506324332093220317729612918280727972572251624132406214020892032201918121781170116881493147214191187
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest41.541.440.942.941.441.240.940.640.640.540.040.139.339.038.538.336.736.536.135.734.033.933.533.331.631.431.531.329.929.929.429.327.727.527.227.225.024.524.024.022.021.821.122.220.220.019.517.1
Percentage of Assets10.810.811.111.010.410.710.710.610.310.410.610.910.410.410.310.39.79.89.79.79.29.39.19.28.78.78.79.08.58.58.38.48.08.07.87.77.27.16.97.16.56.56.20.00.00.05.60.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value13461345134413141313131313111311128712871285128312721272126912691269126912681269126912691268126812671266126412631262125212441244124312361219121912181217121612121211121012051143
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.42.42.52.42.52.62.62.62.62.72.82.92.92.92.93.03.03.13.13.13.23.33.23.33.43.43.43.63.63.73.73.83.93.93.93.94.14.14.14.24.34.44.44.5

Additional Paid In Capital Common Stock

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:AdditionalPaidInCapitalCommonStock


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value743574117404669466796659665666366190617361686125592059035898588858815872588158985896588958895873586358445837581557995681561956155595551553535334531652985327528052615229
Percentage of AdditionalPaidInCapitalCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets13.113.113.712.512.513.013.213.212.712.913.413.713.413.713.713.914.114.214.314.614.915.115.115.415.715.815.816.416.716.616.617.017.317.517.217.217.818.018.118.518.819.1

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value61466082596859125538547854135336502449964893487645804510441343864079403639813924364336203552350632433209322031772961291828072797257225162413240621402089203220191812178117011419
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.810.811.111.010.410.710.710.610.310.410.610.910.410.410.310.39.79.89.79.79.29.39.19.28.78.78.79.08.58.58.38.48.08.07.87.77.27.16.97.16.56.56.25.6

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value-135000000.0-138000000.0-141000000.0-143000000.0-145000000.0-148000000.0-141000000.0-142000000.0-135000000.0-127000000.0-124000000.0-119000000.0-122000000.0-124000000.0-125000000.0-104810000.0-106800000.0-108580000.0-110350000.0-104960000.0-106800000.0-108610000.0-109750000.0-103640000.0-105190000.0-106690000.0-108140000.0-102000000.0-103370000.0-104820000.0-106280000.0-109980000.0-111840000.0-113620000.0-112650000.0-109600000.0-102010000.0-67515000.0-94035000.0-80969000.0-50983000.0-51847000.0-53093000.0-49709000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-0.2-0.2-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.2-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.4-0.4-0.4-0.3-0.2-0.3-0.3-0.2-0.2-0.2-0.2

Stock Issued During Period Value New Issues

us-gaap:StockIssuedDuringPeriodValueNewIssues

us-gaap:StockIssuedDuringPeriodValueNewIssues


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value151573110.0111210.046210.0123520810.017-0.0370.00.05.0370.00.12-0.187-2.7129.8149.435103.2199.9589.931120639.7859.791741689.6379.4979.3575.143399.7519.0176.2294588.9978.64312
Percentage of StockIssuedDuringPeriodValueNewIssues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value14147019.01110.010.043810.010.03319710.0140.490.00.03.510.00.0-0.187-3.7559.1438.6659.3160.8939.1859.135111558.928.966671518.778.6798.4822.288368.7388.0721.6524037.8057.6128.379
Percentage of StockIssuedDuringPeriodValueNewIssues93.393.395.990.0100.083.3100.094.8100.083.394.394.7100.082.4-1324.30.00.069.70.00.0100.0138.593.291.892.727.792.292.091.887.591.291.691.589.991.091.490.644.590.389.689.526.587.986.888.166.3
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1.01.0301.00.02.00.0240.02.02.0110.03.0-0.5270.00.01.5270.00.120.01.0430.6710.770.7392.3260.7730.7969.8857.950.8650.8256.351160.8670.8180.8752.8553.8651.0130.9454.577551.1921.0314.265
Percentage of StockIssuedDuringPeriodValueNewIssues6.76.74.110.00.016.70.05.20.016.75.75.30.017.61424.30.00.030.30.0100.0-0.0-38.56.88.27.372.37.88.08.212.58.88.48.510.19.08.69.455.59.710.410.573.512.113.211.933.7
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue


Adjustments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value9.0-9.07.07.08.0-8.08.07.06.0-7.09.08.07.0-8.08.9946.1567.74-9.89130.9866.6425.3776.5231.5668.8986.772126.6117.7656.065-5.3231012109.539.3789.6048.927101012108.1319.0189.0775.793
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value10.0-7.09.010.09.0-7.010.08.07.0-5.010.08.07.0-8.09.3327.2548.542-9.1289.9994.5236.6425.3776.5231.5668.8986.772126.6117.7656.065-5.3231012109.539.3789.6048.927101012108.1319.0189.0775.793
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue111.177.8128.6142.9112.587.5125.0114.3116.771.4111.1100.0100.0100.0103.8117.8110.492.371.6458.7100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Adjustments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value-1.0-2.0-2.0-3.0-1.0-1.0-2.0-1.0-1.0-2.0-1.00.00.00.0-0.338-1.098-0.802-0.7623.968-3.537
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue-11.122.2-28.6-42.9-12.512.5-25.0-14.3-16.728.6-11.10.00.0-0.0-3.8-17.8-10.47.728.4-358.7
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value625-136.067410264796697061223541793629105655088775810755737186391000622790535980523985643964446592581928431642432706387477481801463659367613361551
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue20.4-3.822.932.218.523.825.240.621.025.221.834.620.730.127.135.622.625.622.932.924.928.520.333.820.833.322.033.616.618.521.332.916.723.117.025.917.018.518.728.319.023.414.323.315.719.6

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-1167000000.0-1035000000.0-1719000000.0-441000000.0-974000000.0-1606000000.0-1214000000.0-1421000000.0-856000000.0-852000000.0-1280000000.0-841000000.0-993000000.0-872000000.0-1057400000.0-764520000.0-726340000.0-747740000.0-1055200000.0-762940000.0-749210000.0-694110000.0-1483500000.0-708220000.0-692630000.0-738390000.0-882500000.0-703530000.0-730460000.0-800770000.0-902590000.0-798820000.0-798710000.0-713260000.0-723350000.0-653230000.0-557350000.0-399010000.0-586850000.0-571070000.0-465540000.0-624350000.0-1285800000.0-586530000.0-474310000.0-460110000.0
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue-38.0-29.2-58.3-13.9-37.7-57.1-43.4-47.2-33.2-27.1-44.4-27.6-37.4-29.5-37.8-25.3-28.6-26.7-37.8-25.1-30.0-25.0-56.1-24.4-27.5-24.9-30.1-24.5-27.2-25.0-33.1-28.3-31.0-25.6-28.4-24.0-24.5-15.5-22.8-20.2-19.1-22.2-50.1-22.3-20.6-16.4

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value412081289-1334.01885933-108.07095746.0585-334.065918213-204.381401914639101-79.405628-3.84171-193.569180-222.971250233326-86.853312101-374.439630133-39.413-28.029-137.3789.127-49.194802122101-121.731
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue1.358.89.8-41.972.933.2-3.923.522.30.220.3-11.024.80.67.6-6.85.50.75.31.34.1-2.923.7-0.16.8-6.56.2-7.89.37.312.0-3.112.13.6-14.723.15.9-1.5-1.1-4.90.4-1.731.34.74.4-4.3

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-501.0910-756.0-749.01390-4.0-616.0511259-53.0
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue-16.325.7-25.7-23.553.8-0.1-22.017.010.1-1.7

Deferred Income Tax Expense Benefit

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:DeferredIncomeTaxExpenseBenefit


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-44.0-23.0-53.045-34.0341383212634745159138191115193107226921601062371088213619686150105173105130671621101677719182114881547694
Percentage of DeferredIncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Accounts Payable

us-gaap:IncreaseDecreaseInAccountsPayable

us-gaap:IncreaseDecreaseInAccountsPayable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value6.0-21.0646341-201.044101-161.04.0533841-42.0110-15.4169-121.39672249-22.063-3.86515-33.003-99.029102-8.054-110.004-37.73135-4.922-3.6865.311175825-202.64996-114.797104-72.42494-56.687-27.052-199.384
Percentage of IncreaseDecreaseInAccountsPayable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Inventories

us-gaap:IncreaseDecreaseInInventories

us-gaap:IncreaseDecreaseInInventories


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value32-39.0435218-33.0248559-84.01026417-118.0-6.1587422-88.355-7.552886.69-88.57-36.41911227-92.01-37.11913265-140.301-26.3311047-87.865-27.14789-1.222-143.87310-28.821-42.567118-34.759-76.302-11.962113
Percentage of IncreaseDecreaseInInventories100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value625-136.067410264796697061223541793629105655088775810755737186391000622790535980523985643964446592581928431642432706387477481801463659367613361551
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue20.4-3.822.932.218.523.825.240.621.025.221.834.620.730.127.135.622.625.622.932.924.928.520.333.820.833.322.033.616.618.521.332.916.723.117.025.917.018.518.728.319.023.414.323.315.719.6

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value311362288603287295292527238315214491265291189492227239227457196241209426196152196368195261150364196236140398183183140338158203136312139167
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue10.110.29.819.011.110.510.417.59.210.07.416.110.09.96.816.38.98.58.115.17.98.77.914.77.85.16.712.87.38.25.512.97.68.55.514.68.07.15.511.96.57.25.311.96.16.0

us-gaap:NetIncomeLoss us-gaap:StatementBusinessSegments

us-gaap:AllOtherSegments


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-26.0-25.0-50.0-29.0-22.0-23.0-32.0-22.0-34.0-24.0-23.0-32.0-26.0-22.0-55.955-12.77-13.472-17.803-15.481-16.307-20.578-15.263-11.83-7.339-11.141-12.6315.643.93-5.81-1.548-3.174-0.23-20.187-2.446
Percentage of NetIncomeLoss-8.4-6.9-17.4-4.8-7.7-7.8-11.0-4.2-14.3-7.6-10.7-6.5-9.8-7.6-29.6-2.6-5.9-7.4-6.8-3.6-10.5-6.3-5.7-1.7-5.7-8.32.91.1-3.0-0.6-2.1-0.1-10.3-1.0
Percentage of RegulatedAndUnregulatedOperatingRevenue-0.8-0.7-1.7-0.9-0.9-0.8-1.1-0.7-1.3-0.8-0.8-1.0-1.0-0.7-2.0-0.4-0.5-0.6-0.6-0.5-0.8-0.6-0.4-0.3-0.4-0.40.20.1-0.2-0.0-0.1-0.0-0.8-0.1
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:AllOtherSegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ElectricityUsRegulated


Net
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value632289227256550249234180514
Percentage of NetIncomeLoss104.8100.776.987.7104.4104.674.384.1104.7
Percentage of RegulatedAndUnregulatedOperatingRevenue19.911.28.19.118.39.77.46.216.9
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:ElectricityUsRegulated0.00.00.00.00.00.00.00.00.0

us-gaap:NaturalGasUsRegulated


Net
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value0.0209168-1.023105579.0
Percentage of NetIncomeLoss0.07.030.823.3-0.29.733.326.61.8
Percentage of RegulatedAndUnregulatedOperatingRevenue0.00.83.22.4-0.00.93.32.00.3
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:NaturalGasUsRegulated0.00.00.00.00.00.00.00.00.0

xel:RegulatedElectric


Net
Period End2021-06-302021-03-312020-06-302020-03-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value30426928922724923418051426421914150322719420347920517818743721481158360185185110365201174
Percentage of NetIncomeLoss97.774.3100.776.9104.674.384.1104.799.675.374.7102.2100.181.189.5104.7104.473.989.7102.7109.253.380.997.895.171.073.5100.1102.173.6
Percentage of RegulatedAndUnregulatedOperatingRevenue9.97.611.28.19.77.46.216.99.97.45.116.79.06.97.315.88.26.47.115.18.52.75.412.66.95.84.012.97.86.3
Percentage of RegulatedAndUnregulatedOperatingRevenue xel:RegulatedElectric0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

xel:RegulatedNaturalGas


Net
Period End2021-06-302021-03-312020-06-302020-03-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value33118209123105579.027951041.853136239-5.297117833-4.176-6.88383313.996157743-0.1741564
Percentage of NetIncomeLoss10.632.67.030.89.733.326.61.810.232.655.10.45.826.317.3-1.26.132.516.0-1.0-3.555.016.31.17.829.628.7-0.08.127.4
Percentage of RegulatedAndUnregulatedOperatingRevenue1.13.30.83.20.93.32.00.31.03.23.70.10.52.21.4-0.20.52.81.3-0.1-0.32.81.10.10.62.41.6-0.00.62.3
Percentage of RegulatedAndUnregulatedOperatingRevenue xel:RegulatedNaturalGas0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value311362603287295292527238315214491265291189492227239227457196241209426196152196368195261150364196236140398183183140338158203136312139
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.2100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue10.110.219.011.110.510.417.59.210.07.416.110.09.96.816.38.98.58.115.17.98.77.914.77.85.16.712.87.38.25.512.97.68.55.514.68.07.15.511.96.57.25.311.96.1
Percentage of RegulatedAndUnregulatedOperatingRevenue us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Share Based Compensation

us-gaap:ShareBasedCompensation

us-gaap:ShareBasedCompensation


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value129.0131915261112161920154.06.012121317115.4181113158.3451110155.5465.625.37-3.7499.615108.1676.0843.637133.8831311109.8958.535109.3417.129
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-1167000000.0-1035000000.0-1719000000.0-441000000.0-974000000.0-1606000000.0-1214000000.0-1421000000.0-856000000.0-852000000.0-1280000000.0-841000000.0-993000000.0-872000000.0-1057400000.0-764520000.0-726340000.0-747740000.0-1055200000.0-762940000.0-749210000.0-694110000.0-1483500000.0-708220000.0-692630000.0-738390000.0-882500000.0-703530000.0-730460000.0-800770000.0-902590000.0-798820000.0-798710000.0-713260000.0-723350000.0-653230000.0-557350000.0-399010000.0-586850000.0-571070000.0-465540000.0-624350000.0-1285800000.0-586530000.0-474310000.0-460110000.0
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue-38.0-29.2-58.3-13.9-37.7-57.1-43.4-47.2-33.2-27.1-44.4-27.6-37.4-29.5-37.8-25.3-28.6-26.7-37.8-25.1-30.0-25.0-56.1-24.4-27.5-24.9-30.1-24.5-27.2-25.0-33.1-28.3-31.0-25.6-28.4-24.0-24.5-15.5-22.8-20.2-19.1-22.2-50.1-22.3-20.6-16.4

Payments To Acquire Productive Assets

us-gaap:PaymentsToAcquireProductiveAssets

us-gaap:PaymentsToAcquireProductiveAssets


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value94310241688111296216071207132984584411978571020883106278272474910697737127001496708707770898725753822941857844752764702606497601481581540655594486481
Percentage of PaymentsToAcquireProductiveAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments To Acquire Investments

us-gaap:PaymentsToAcquireInvestments

us-gaap:PaymentsToAcquireInvestments


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value429199123115325835523-16.018330535912718218572560319517215670210109484133
Percentage of PaymentsToAcquireInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value412081289-1334.01885933-108.07095746.0585-334.065918213-204.381401914639101-79.405628-3.84171-193.569180-222.971250233326-86.853312101-374.439630133-39.413-28.029-137.3789.127-49.194802122101-121.731
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RegulatedAndUnregulatedOperatingRevenue1.358.89.8-41.972.933.2-3.923.522.30.220.3-11.024.80.67.6-6.85.50.75.31.34.1-2.923.7-0.16.8-6.56.2-7.89.37.312.0-3.112.13.6-14.723.15.9-1.5-1.1-4.90.4-1.731.34.74.4-4.3

Proceeds From Issuance Of Long Term Debt

us-gaap:ProceedsFromIssuanceOfLongTermDebt

us-gaap:ProceedsFromIssuanceOfLongTermDebt


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value0.018210.049324470.0983111842739229419511860.09510283940.0791295590747-0.9787858410.0-0.21-0.788542295-3.094978424949815801100.745-0.0886880.00.0395494
Percentage of ProceedsFromIssuanceOfLongTermDebt0.0100.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt

us-gaap:RepaymentsOfLongTermDebt


Repayments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-1.04003007010.00.0550-1.00.04001513001.00.0-0.0997792500.2174550.1915790.3330.238250-0.0010.4550.240.2242750.224-2.4133.3484002516496511.6970.7581.0981021.190.5513591740.50525
Percentage of RepaymentsOfLongTermDebt100.0100.0100.0100.00.00.0100.0100.00.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments Of Dividends

us-gaap:PaymentsOfDividends

us-gaap:PaymentsOfDividends


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value237223218217217204204200200187186185184175182182182172172172172162154154153144143143142132131131125124124124119119123119116115109109106105
Percentage of PaymentsOfDividends100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:EffectiveIncomeTaxRateContinuingOperations


Effective
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-13.9-6.5-2.46.7-0.047-0.021-0.0160.120.0920.074-0.0260.1290.1690.1690.0140.2940.310.329
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities us-gaap:IncomeTaxAuthority

us-gaap:DeferredTaxLiabilities

xel:NetDeferredTaxLiablility


Deferred
Period End2020-12-312019-12-31
Value47464509
Percentage of DeferredTaxLiabilities100.0100.0

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits

us-gaap:UnrecognizedTaxBenefits


Unrecognized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value545352414646444340383738344039421371351331301241221207673706640373541413937343732333435404040304230
Percentage of UnrecognizedTaxBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:DeferredTaxAssetsValuationAllowance


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value4.067797757273.4023.2633.3145.6831.927
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Proceeds From Repayments Of Short Term Debt

us-gaap:ProceedsFromRepaymentsOfShortTermDebt

us-gaap:ProceedsFromRepaymentsOfShortTermDebt


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value26889384-910.0-355.01170-338.0-664.0345214601-244.0-343.0211300-270.017921326-81.0264-663.0782-387.0-518.0-50.5322-80.8126.0457-52.0-71.0-177.0298-177.0142120169-606.012465426-89.0-337.07.0
Percentage of ProceedsFromRepaymentsOfShortTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForFundsUsedDuringConstructionInvestingActivities

us-gaap:AllowanceForFundsUsedDuringConstructionInvestingActivities


Allowance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value18142430382322152020293026232023161415171413151512122023232124212219181515131211131316131213
Percentage of AllowanceForFundsUsedDuringConstructionInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalExpendituresIncurredButNotYetPaid

us-gaap:CapitalExpendituresIncurredButNotYetPaid


Capital
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value97412-533.04971522841.011666238606621241146354718532-31.215591923778-33.3652399.76710215290153-3.2254525659-44.503502241.322154.4131161128.7922627
Percentage of CapitalExpendituresIncurredButNotYetPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:CommonStockDividendsPerShareDeclared


Common
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-312008-12-312008-09-302008-06-302008-03-31
Value0.430.430.430.430.4050.4050.410.410.380.380.380.380.360.360.360.360.340.340.340.340.320.320.320.320.30.30.30.30.280.280.280.270.270.270.270.260.260.260.260.250.25250.25250.25250.2450.2450.2450.2450.23750.23750.23750.23750.23
Percentage of CommonStockDividendsPerShareDeclared100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtRelatedCommitmentFeesAndDebtIssuanceCosts

us-gaap:DebtRelatedCommitmentFeesAndDebtIssuanceCosts


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value7.07.07.07.07.07.07.06.06.06.07.06.06.06.06.3435.9235.8765.8586.1446.066.636.3366.3566.265.8615.6985.8425.7375.6145.7926.0776.02125.8095.9616.016.0366.086.2956.2796.1855.265.2525.2295.1465.011
Percentage of DebtRelatedCommitmentFeesAndDebtIssuanceCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value-2000000.0-1000000.0-1000000.0-1000000.0-1000000.0-1000000.0-1000000.0-1000000.0-1000000.0-1000000.0-2000000.0-2000000.0-2000000.0-2000000.0-1984000.0-1672000.0-1000000.0-1000000.0-969000.0-1011000.0
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value-27000000.0-27000000.0-26000000.0-25000000.0-25000000.0-25000000.0-21000000.0-22000000.0-22000000.0-22000000.0-28000000.0-27000000.0-27000000.0-27000000.0-26988000.0-26671000.0-26000000.0-26000000.0-23846000.0-24384000.0
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses1350.02700.02600.02500.02500.02500.02100.02200.02200.02200.01400.01350.01350.01350.01360.31595.22600.02600.02460.92411.9

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value-2.0-2.0-2.0-2.0-2.0-2.0-2.0-3.0-3.0-3.0-3.0-3.0-3.0-3.0-2.985-2.672-3.0-3.0-2.985-2.672
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value-1.0-1.0-1.0-1.0-1.0-2.0-1.0-1.0-1.0-2.0-1.0-1.0-1.0-0.674-0.4420.00.0-0.561-0.478
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit50.050.050.050.050.0100.033.333.333.366.733.333.333.322.616.5-0.0-0.018.817.9

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value5.04.04.05.05.05.05.05.05.05.07.06.06.06.06.5346.1556.06.06.2546.249
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value5152525252525151515152525252525252525252
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets1020.01300.01300.01040.01040.01040.01020.01020.01020.01020.0742.9866.7866.7866.7796.6850.0866.7866.7835.9841.3

us-gaap:DefinedBenefitPlanInterestCost us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanInterestCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value3.04.04.05.05.05.05.06.06.06.06.05.05.05.06.0485.9846.06.06.426.527
Percentage of DefinedBenefitPlanInterestCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value2626313131313736363633333333363636363940
Percentage of DefinedBenefitPlanInterestCost866.7650.0775.0620.0620.0620.0740.0600.0600.0600.0550.0660.0660.0660.0610.0613.3600.0600.0621.8613.3

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value-1.00.00.00.00.00.0-1.0-1.0-1.00.00.0-1.0-1.0-0.882-0.706-1.0-1.0-1.145-0.951
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.00.00.00.00.00.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value2726293128293028292938403031483030303130
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost-2700.00.00.00.00.00.00.0-2800.0-2900.0-2900.00.00.0-3000.0-3100.0-5447.1-4327.2-3000.0-3000.0-2769.8-3188.4

us-gaap:DefinedBenefitPlanServiceCost us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanServiceCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value1.00.00.00.00.01.00.00.00.01.01.01.01.00.6050.4651.01.00.7050.432
Percentage of DefinedBenefitPlanServiceCost100.00.00.00.00.0100.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value2626232424242222222223242424232324242322
Percentage of DefinedBenefitPlanServiceCost2600.00.00.00.00.00.02200.00.00.00.02300.02400.02400.02400.03861.05063.92400.02400.03290.15310.2

us-gaap:DepreciationAmortizationAndAccretionNet

us-gaap:DepreciationAmortizationAndAccretionNet


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value526517500517476466453451443438446444382387381375369368336332326323301284279277266259259250261232254253236243231233198246238224210226215206
Percentage of DepreciationAmortizationAndAccretionNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeGainLossOnDerivativeNet us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:DerivativeGainLossOnDerivativeNet

xel:CommodityTradingContract, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value12320.02.0-3.01.0-3.01.05.01.00.05.02.03.01.9311.2825.7851.001-0.7011.7790.4811.009-1.39-3.464.4013.88-0.385-1.6565.176-2.253
Percentage of DerivativeGainLossOnDerivativeNet100.0100.00.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

xel:NaturalGasCommodity, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value0.0-10.00.00.0-6.00.0-1.0-3.0
Percentage of DerivativeGainLossOnDerivativeNet0.0-31.20.0-0.0-600.00.0-20.0-300.0

us-gaap:DerivativeGainLossOnDerivativeNet us-gaap:HedgingDesignation

us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value1222-7.02.0-3.0-5.0-6.01.05.0-2.0-2.05.02.01.00.0011.2825.785-3.069-3.9481.7730.506-4.015-3.775-3.8654.40112-8.03-1.8655.754-7.555
Percentage of DerivativeGainLossOnDerivativeNet100.068.80.0100.0100.0-500.0200.0100.0100.0-200.00.0100.0100.033.30.1100.0100.0-306.6563.299.7105.2-397.9271.6111.7100.0331.72085.7112.6111.2335.3

us-gaap:DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation

us-gaap:DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet

us-gaap:InterestRateContract, us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-30
Value-2000000.0-2000000.0-2000000.0-1000000.0-2000000.0-2000000.0-1000000.0-1000000.0-1000000.0-1000000.0-1000000.0-1000000.0-1000000.0-743000.0-1579000.0-1319000.0-1359000.0-1389000.0-1502000.0-1483000.0-1485000.0-1502000.0-1118000.0-954000.0-941000.0-967000.0-967000.0-956000.0
Percentage of DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation

us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-30
Value-2000000.0-2000000.0-2000000.0-1000000.0-2000000.0-2000000.0-1000000.0-1000000.0-1000000.0-1000000.0-1000000.0-1000000.0-1000000.0-759000.0-1568000.0-1314000.0-1359000.0-1430000.0-1548000.0-1530000.0-1542000.0-1545000.0-1152000.0-982000.0-967000.0-973000.0-951000.0-939000.0
Percentage of DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0102.299.399.6100.0103.0103.1103.2103.8102.9103.0102.9102.8100.698.398.2

us-gaap:DividendsCommonStock

us-gaap:DividendsCommonStock


Dividends
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value246246230226226227213214209210196195195194184184183183173173173173163163163163152152151150139140140134132132131127127126126122-815.823116117112
Percentage of DividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStock us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Dividends
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value246246230226226227213214209210196195195194184184183183173173173173163163163163152152151150139140140134132132131127127126126122-815.823116117112
Percentage of DividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate

us-gaap:EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate


Effective
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value21.021.0021.00.210.2100.210.210.2100.210.210.2100.350.350.35
Percentage of EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationOtherAdjustments

us-gaap:EffectiveIncomeTaxRateReconciliationOtherAdjustments


Effective
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-0.1-1.7-0.1-1.2-0.007-0.015-0.995-0.0060.012-0.0160.009-0.011-0.014-0.0160.02-0.04-0.026-0.015
Percentage of EffectiveIncomeTaxRateReconciliationOtherAdjustments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent

us-gaap:EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent


Effective
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value0-1.0-0.019-0.0090.028-0.017-0.006-0.0270.033-0.07-0.011-0.0140.0140
Percentage of EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes

us-gaap:EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes


Effective
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value4.94.9-0.25.00.0510.049-0.0010.050.050.0500.050.0510.049-0.0020.0410.0410.04
Percentage of EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationTaxCredits

us-gaap:EffectiveIncomeTaxRateReconciliationTaxCredits


Effective
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value33.124.62.58.00.2110.1720.0130.0610.1190.0860.0090.0260.0540.060.0020.0480.0450.04
Percentage of EffectiveIncomeTaxRateReconciliationTaxCredits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquityMethodInvestmentDividendsOrDistributions

us-gaap:EquityMethodInvestmentDividendsOrDistributions


Equity
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value10.01110.01110.01110.010.010.010.010.09.09.09.08.6848.809111111111111109.689.8789.8769.5779.0169.2648.858.9138.829.1449.5398.548160.08.0288.5538.558.4778.4548.7178.037.9367.855
Percentage of EquityMethodInvestmentDividendsOrDistributions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings us-gaap:DerivativeInstrumentRisk

us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings

us-gaap:CommodityContract


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value9.038-28.0-25.09.06.01.01.07.0-18.0-1.00.0-2.02.0-0.7690.5486.016-0.794-0.0210.009-0.018-0.0240.1320.1211.220.061.7751.486.4380.9990.2184.008-0.217-0.062
Percentage of FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchases us-gaap:DerivativeInstrumentRisk

us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchases

us-gaap:CommodityContract


Fair
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value632.00.037122.05.0344.010.03.0451.01.9270.0763.7922.2970.274291.843-0.0120.486575.7928.2565.5881201.0569.9330.155510.0
Percentage of FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchases100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements us-gaap:DerivativeInstrumentRisk

us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements

us-gaap:CommodityContract


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value321614172518162116118.019201221332219283314181220171938203353149.3428.50312
Percentage of FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseInterestExpense

us-gaap:FinanceLeaseInterestExpense


Finance
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-30
Value4.04.04.05.05.05.05.0
Percentage of FinanceLeaseInterestExpense100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseRightOfUseAssetAmortization

us-gaap:FinanceLeaseRightOfUseAssetAmortization


Finance
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-30
Value2000000.02000000.02000000.03000000.01000000.01000000.02000000.0
Percentage of FinanceLeaseRightOfUseAssetAmortization100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainLossRelatedToLitigationSettlement

us-gaap:GainLossRelatedToLitigationSettlement


Gain
Period End2020-12-31
Value0.0
Percentage of GainLossRelatedToLitigationSettlement0.0

us-gaap:GainLossRelatedToLitigationSettlement dei:LegalEntity

xel:NspMinnesota


Gain
Period End2021-06-302021-03-31
Value0.036
Percentage of GainLossRelatedToLitigationSettlement0.00.0

us-gaap:IncomeLossFromEquityMethodInvestments

us-gaap:IncomeLossFromEquityMethodInvestments


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value201411126.01110.010.09.09.010.09.09.06.07.5047.087.5417.8759.6239.7019.61713108.1628.4227.7767.5017.4017.8117.4387.6417.2737.5297.5777.8217.497.5027.1587.7147.4237.6777.7137.5157.677.3627.401
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccountsAndOtherReceivables

us-gaap:IncreaseDecreaseInAccountsAndOtherReceivables


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value6.05746127-12.0-7.05983-236.01145737-60.0712848-21.8654.9595364-39.8224.781965-150.5740.29110917-142.3681400.423296.7357271124-51.7155246-5.26585-46.94761-104.99480-7.179
Percentage of IncreaseDecreaseInAccountsAndOtherReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInEmployeeRelatedLiabilities

us-gaap:IncreaseDecreaseInEmployeeRelatedLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value4000000.0-132000000.013000000.08000000.011000000.0-157000000.03000000.01000000.06000000.0-145000000.0-45000000.08000000.04000000.0-146000000.01455000.06024000.08086000.0-148560000.05643000.012212000.010212000.0-118770000.012757000.0-3332000.06788000.0-85469000.010006000.03992000.010325000.0-125780000.03223000.010570000.010929000.0-181090000.0-2641000.0-12383000.011132000.0-180030000.0-14179000.0-4646000.02112000.0-134000000.0-53144000.0-2312000.0-4936000.0-2233000.0
Percentage of IncreaseDecreaseInEmployeeRelatedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherCurrentAssets

us-gaap:IncreaseDecreaseInOtherCurrentAssets


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-16.0-8.0-23.075-38.031-22.016-52.03334-13.0-38.0-1.055-148.2327.2667619-11.073-86.1281663-3.365-12.395-56.68585-6.256-34.163662423-80.903510.418-31.002-10.25671-2.242-112.61395-43.55121-61.904
Percentage of IncreaseDecreaseInOtherCurrentAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherCurrentLiabilities

us-gaap:IncreaseDecreaseInOtherCurrentLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-278.01383187-164.0-77.08595-159.0-36.09789-230.0-17.07378-147.914-42.279688-119.147-44.9295.841152-126.7534122144-130.9891.008-3.429213-103.654207882-135.3641710684-83.6015.4915993
Percentage of IncreaseDecreaseInOtherCurrentLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInRegulatoryAssetsAndLiabilities

us-gaap:IncreaseDecreaseInRegulatoryAssetsAndLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-167.09615.015189-101.06031128-153.0-59.0-21.04.0-147.0-10.5562816-17.86323300.14-34.404131316-146.097-33.689-98.459-63.9280.253-40.677-23.95511-88.572-4.0181148-61.872-14.944-92.45-59.7411749-112.7711.61426
Percentage of IncreaseDecreaseInRegulatoryAssetsAndLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncrementalCommonSharesAttributableToContingentlyIssuableShares

us-gaap:IncrementalCommonSharesAttributableToContingentlyIssuableShares


Incremental
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value300000.0200000.0100000.01600000.0500000.0800000.0-300000.01800000.01800000.01200000.0100000.0400000.0400000.0500000.0-52000.0492000.0289000.0750000.059000.0494000.0300000.0635000.064000.0550000.0323000.0660000.056000.0581000.0391000.0779000.0
Percentage of IncrementalCommonSharesAttributableToContingentlyIssuableShares100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LineOfCreditFacilityInterestRateDuringPeriod us-gaap:ConsolidatedEntities

us-gaap:LineOfCreditFacilityInterestRateDuringPeriod

srt:ParentCompany


Line
Period End2020-12-312019-12-312018-12-31
Value0.080.01670.0222
Percentage of LineOfCreditFacilityInterestRateDuringPeriod100.0100.0100.0

us-gaap:LineOfCreditFacilityInterestRateDuringPeriod us-gaap:ShortTermDebtType

us-gaap:CommercialPaper


Line
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value0.660.530.60.810.01650.02050.02620.02830.02680.02450.02420.01930.01630.0150.01280.00970.00750.00770.00720.00730.00560.00460.00480.00460.00360.0033
Percentage of LineOfCreditFacilityInterestRateDuringPeriod0.00.0750.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingLeaseCost

us-gaap:OperatingLeaseCost


Operating
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value6566525466676161
Percentage of OperatingLeaseCost100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeaseCost us-gaap:PropertyPlantAndEquipmentByType

us-gaap:PropertyPlantAndEquipmentOtherTypes


Operating
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value9.08.09.08.08.09.08.09.0
Percentage of OperatingLeaseCost13.812.117.314.812.113.413.114.8

xel:PurchasedPowerAgreements


Operating
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value5658434658585352
Percentage of OperatingLeaseCost86.287.982.785.287.986.686.985.2

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax


Other
Period End2021-06-302020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value1000000.01000000.02000000.01000000.01000000.001000000.03000000.04000000.01000000.01000000.04114000.0982000.0956000.0948000.01517000.0878000.0865000.0211000.0883000.0884000.0883000.0876000.0920000.0847000.0864000.0864000.01631000.01179000.01135000.0-639000.0956000.0911000.0932000.0
Percentage of OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax


Other
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value01000000.000001000000.01000000.01000000.003195000.0582000.0608000.0615000.0958000.0536000.0550000.0142000.0560000.0559000.0561000.0569000.0493000.0567000.0550000.0550000.0233000.0686000.0729000.02503000.0662000.0636000.0647000.0
Percentage of OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax0.0100.00.00.00.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax

us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value000-10000000.02000000.0-9000000.0-10000000.0-7000000.0-5000000.000-49000.023000.026000.0-1000.0-4000.012000.0-4000.0-35000.0-42000.018000.0-11000.0-129000.0-42000.016000.0-7000.021000.022000.0-44000.013000.0
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax0.00.00.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value-5000000.000-10000000.00-9000000.0-9000000.0-5000000.0-9000000.0-2000000.0-3050000.023000.027000.0-7131000.0-4000.012000.0-657000.0-7942000.0-43000.019000.0
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax0.00.00.0100.00.0100.090.071.4180.00.06224.5100.0103.8713100.0100.0100.016425.022691.4102.4105.6

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value3.03.02.03.0-7.01.0-7.0-8.0-3.0-5.03.02.01.01.4551.9861.7861.773-5.3931.8341.8131.145-6.1141.5471.5021.451-6.1381.3651.4541.4553.7051.8551.785-0.967-3.053-7.594-34.49126-13.066-29.9860.8641.246
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value3.03.02.03.0-7.01.0-7.0-8.0-3.0-5.03.02.01.01.4551.9861.7861.773-5.3931.8341.8131.145-6.1141.5471.5021.451-6.1381.3651.4541.4553.7051.8551.785-0.967-3.053-7.594-34.49126-13.066-29.9860.8641.246
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value-2000000.0-3000000.09000000.0-1000000.0-1000000.0-2000000.0-1000000.0-1000000.0-1000000.0-1000000.0-1000000.0-1000000.0-1000000.00-391000.0-981000.0-803000.0-825000.0-874000.0-960000.0-936000.0-938000.0-945000.0-706000.0-600000.0-585000.0-595000.0-558000.0-574000.0-560000.0-548000.0-539000.0-694000.0305000.0-2941000.0-393000.0-182000.0
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-30
Value01000000.01000000.001000000.01000000.000000000-368000.0-587000.0-511000.0-534000.0-556000.0-588000.0-594000.0-604000.0-600000.0-446000.0-382000.0-382000.0-378000.0-393000.0-365000.0-358000.0-396000.0-266000.0-451000.0-1429000.0-2077000.0-296000.0-158000.0
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax0.0100.0100.00.0100.0100.00.00.00.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax

us-gaap:InterestRateContract, us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-09-30
Value000-13000000.03000000.0-12000000.0-13000000.0-9000000.0-7000000.000
Percentage of OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax0.00.00.0100.0100.0100.0100.0100.0100.00.00.0

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation

us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-09-30
Value000-13000000.03000000.0-12000000.0-13000000.0-9000000.0-7000000.000
Percentage of OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax0.00.00.0100.0100.0100.0100.0100.0100.00.00.0

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.00.00.0-10.02.0-9.0-10.0-7.0-5.00.00.00.0-0.0490.0230.0260.0-0.001-0.0040.012-0.004-0.035-0.0420.018-0.011-0.129-0.0420.016-0.0070.0210.022-0.0440.013-0.012-8.853-35.72725-7.552-30.947-0.0380.2440.0610.035-4.4130.023
Percentage of OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax0.00.00.0100.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value0.00.00.0-3.00.0-3.0-3.0-2.0-2.00.00.00.0-0.0320.0150.0170.0-0.001-0.0020.007-0.002-0.022-0.0280.011-0.007-0.081-0.0270.009-0.0050.0190.014-0.0290.012-0.007-5.913-23.16416-4.898-20.292-0.040.145
Percentage of OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax0.00.00.0100.00.0100.0100.0100.0100.00.00.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value0.00.00.0-3.01.0-3.0-3.0-2.0-2.00.0
Percentage of OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax0.00.00.0100.00.0100.0100.0100.0100.00.0

us-gaap:OtherCostOfOperatingRevenue

us-gaap:OtherCostOfOperatingRevenue


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value9.08.09.0118.09.0129.010.010.09.09.08.08.08.7848.4518.1788.587108.6488.3328.2459.88.2038.164109.5698.0127.6429.1299.4917.547.8818.4118.5687.2515.9447.3048.2917.1546.8918.0558.2968.8484.7047.692
Percentage of OtherCostOfOperatingRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherOperatingActivitiesCashFlowStatement

us-gaap:OtherOperatingActivitiesCashFlowStatement


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value41-40.0-34.0-49.0-68.014-79.01356.0-22.0-55.0-10.0-5.0-1.0-0.423-0.136-2.4410.0-0.6230.1220.0-0.388-1.3260.00.00.0
Percentage of OtherOperatingActivitiesCashFlowStatement100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.0100.00.00.00.0

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsForProceedsFromOtherInvestingActivities


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value116.0268.07.0-6.0-3.0926.03.0-1.09.0-2.03.01.1970.320.1685.315-0.585-0.104-1.6481.548-0.531-0.731-1.2382.6452.585-0.4580.0671.5013.242-0.172-1.0492.7453.109-0.367-1.281.3042.0230.165-1.5815.545
Percentage of PaymentsForProceedsFromOtherInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionContributions dei:LegalEntity, us-gaap:RetirementPlanType, us-gaap:SubsequentEventType

us-gaap:PensionContributions

xel:XcelEnergy, us-gaap:OverfundedPlan, us-gaap:SubsequentEvent


Pension
Period End2021-01-31
Value10.0
Percentage of PensionContributions100.0

xel:XcelEnergy, us-gaap:PensionPlansDefinedBenefit, us-gaap:SubsequentEvent


Pension
Period End2021-01-31
Value125
Percentage of PensionContributions1250.0

us-gaap:PensionContributions us-gaap:ConsolidatedEntities, us-gaap:RetirementPlanType

srt:ParentCompany, us-gaap:PensionPlansDefinedBenefit


Pension
Period End2021-01-312020-01-312019-07-012019-01-31
Value1251504.0150
Percentage of PensionContributions1250.00.00.00.0

us-gaap:ProceedsFromIssuanceOfCommonStock

us-gaap:ProceedsFromIssuanceOfCommonStock


Proceeds
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value7221.0270.00.00.00.00.01.7131.8891.9981.4112.1592.066113632.3472.307671602.1722.182.11.598322.3751.9111.8784511.5751.7052.589
Percentage of ProceedsFromIssuanceOfCommonStock100.0100.0100.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromIssuanceOfCommonStock xel:ShareIssuanceProgram

xel:DividendReinvestmentProgram


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value151310.010.010.010.0109.59.410.0
Percentage of ProceedsFromIssuanceOfCommonStock0.00.01.40.00.00.01010.00.00.00.0

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value9000000.0-10000000.01000000.0-4000000.010000000.0-33000000.00-3000000.02000000.0-13000000.01000000.0-3000000.01000000.0-18000000.0291000.000-18291000.0000-12487000.0
Percentage of ProceedsFromPaymentsForOtherFinancingActivities100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.00.00.00.0100.0

us-gaap:ProceedsFromSaleAndMaturityOfOtherInvestments

us-gaap:ProceedsFromSaleAndMaturityOfOtherInvestments


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value216194118110320830513-16.017830035412217817972059818216715165158104482117
Percentage of ProceedsFromSaleAndMaturityOfOtherInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment dei:LegalEntity, us-gaap:CounterpartyName, us-gaap:PublicUtilityRegulatedOrUnregulatedStatus

us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment

xel:MECHoldingsLLC, xel:SouthwestGenerationDomain, us-gaap:UnregulatedOperation


Proceeds
Period End2020-12-31
Value0.0
Percentage of ProceedsFromSaleOfPropertyPlantAndEquipment0.0

us-gaap:ProceedsFromSalesOfBusinessAffiliateAndProductiveAssets

us-gaap:ProceedsFromSalesOfBusinessAffiliateAndProductiveAssets


Proceeds
Period End2020-12-31
Value0.0
Percentage of ProceedsFromSalesOfBusinessAffiliateAndProductiveAssets0.0

us-gaap:PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity

us-gaap:PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity


Public
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value18142430372322152020293026232023161415171413151512122023232124212219181515131211131316131213
Percentage of PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax us-gaap:DerivativeInstrumentRisk, us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax

us-gaap:InterestRateSwap, us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value2000000.03000000.01000000.01000000.01000000.02000000.01000000.01000000.01000000.0-1000000.0-5000000.01000000.01000000.0
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestRateSwap, us-gaap:AccumulatedOtherComprehensiveIncome


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value2000000.03000000.01000000.01000000.01000000.02000000.01000000.01000000.01000000.01000000.01000000.01000000.0
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0-100.0-20.0100.0

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Reclassification
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value1000000.06000000.01000000.02000000.01000000.001000000.00-1000000.0-3000000.0-4000000.0-1000000.0-1000.0-4114000.0-982000.0-956000.0-948000.0-864000.0-878000.0-865000.0-864000.0-883000.0-884000.0-883000.0-876000.0-920000.0-847000.0-864000.0-864000.0-1631000.0-1179000.0-1135000.0639000.0
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax50.0600.0100.0200.050.00.0100.00.0100.060.0-400.0-100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Reclassification
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value1000000.06000000.01000000.02000000.01000000.001000000.001000000.017000000.0-5000000.0-2000000.0-1000.0-4505000.0-1963000.0-1759000.0-1773000.0-1738000.0-1838000.0-1801000.0-1802000.0-1828000.0-1590000.0-1483000.0
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax50.0600.0100.0200.050.00.0100.00.0-100.0-340.0-500.0-200.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ReclassificationFromAociCurrentPeriodTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAociCurrentPeriodTax

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Reclassification
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value2000000.001000000.0000005000000.0-2000000.0-1000000.006805000.0-582000.0-608000.0-615000.03820000.0-536000.0-549000.0-550000.03938000.0-559000.0-561000.0
Percentage of ReclassificationFromAociCurrentPeriodTax100.00.0100.00.00.00.00.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RegulatedOperatingRevenueGas

us-gaap:RegulatedOperatingRevenueGas


Regulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value449647554219280583544222308794558227
Percentage of RegulatedOperatingRevenueGas100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RegulatedOperatingRevenueGas us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:IntersegmentElimination, us-gaap:NaturalGasUsRegulated


Regulated
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value0.01.00.01.00.00.01.01.0
Percentage of RegulatedOperatingRevenueGas0.00.40.00.20.00.00.10.2

us-gaap:OperatingSegments, us-gaap:NaturalGasUsRegulated


Regulated
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value219280583544222308794558227
Percentage of RegulatedOperatingRevenueGas100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, xel:RegulatedNaturalGas


Regulated
Period End2021-06-302021-03-312020-06-302020-03-31
Value449647280583
Percentage of RegulatedOperatingRevenueGas100.0100.0100.0100.0

us-gaap:RevenueNotFromContractWithCustomer us-gaap:ProductOrService

us-gaap:RevenueNotFromContractWithCustomer

xel:AlternativeandOther


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-30
Value152232178219145137144138114101145133113127130
Percentage of RevenueNotFromContractWithCustomer100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueNotFromContractWithCustomer us-gaap:ProductOrService, us-gaap:StatementBusinessSegments

xel:AlternativeandOther, us-gaap:AllOtherSegments


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-30
Value3.03.02.04.03.04.03.03.03.03.03.03.02.02.02.0
Percentage of RevenueNotFromContractWithCustomer2.01.31.11.82.12.92.12.22.63.02.12.31.81.61.5

xel:AlternativeandOther, xel:RegulatedElectric


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-30
Value125172155204128117123119101881101028188107
Percentage of RevenueNotFromContractWithCustomer82.274.187.193.288.385.485.486.288.687.175.976.771.769.382.3

xel:AlternativeandOther, xel:RegulatedNaturalGas


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-30
Value245721111416181610.010.03228303721
Percentage of RevenueNotFromContractWithCustomer15.824.611.85.09.711.712.511.68.89.922.121.126.529.116.2

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability


Right
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value8.03538.00.0125-125.018416590.00.00.00.0
Percentage of RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability100.0100.0100.00.0100.0100.0100.0100.00.00.00.00.0

us-gaap:ShortTermLeaseCost

us-gaap:ShortTermLeaseCost


Short
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-30
Value2000000.01000000.01000000.01000000.01000000.01000000.02000000.0
Percentage of ShortTermLeaseCost100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShorttermDebtAverageOutstandingAmount us-gaap:ShortTermDebtType

us-gaap:ShorttermDebtAverageOutstandingAmount

us-gaap:CommercialPaper


Shortterm
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value15211129415119514961404130313131186500634102810005606797785572904774047742902727801076802730
Percentage of ShorttermDebtAverageOutstandingAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShorttermDebtMaximumAmountOutstandingDuringPeriod us-gaap:ShortTermDebtType

us-gaap:ShorttermDebtMaximumAmountOutstandingDuringPeriod

us-gaap:CommercialPaper


Shortterm
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value1745205461314381770208017801597140310388241349119781486712477195826098411183846478107213601021894
Percentage of ShorttermDebtMaximumAmountOutstandingDuringPeriod100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssued1

us-gaap:StockIssued1


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value16191616171817141517151715207.6064.8896.83211114.035.7947.703138.6711614191314141.9871718181615161816
Percentage of StockIssued1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodSharesNewIssues us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesNewIssues

us-gaap:CommonStock


Stock
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value110.3020.1710.4950.1559.5190.1970.6370.7384.4010.2360.9210.00.00.00.6110.00.0480.00.4170.2690.3080.2950.9310.3090.3183.9543.180.3460.332.5416.7950.3470.3270.351.1421.5460.4050.3781.831220.4780.4121.706
Percentage of StockIssuedDuringPeriodSharesNewIssues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockRepurchasedDuringPeriodShares us-gaap:StatementEquityComponents

us-gaap:StockRepurchasedDuringPeriodShares

us-gaap:CommonStock


Stock
Period End2020-12-312020-09-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312012-12-312012-09-302012-06-302012-03-31
Value1000.054000.00006000.000022000.0000700000.0
Percentage of StockRepurchasedDuringPeriodShares100.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.0

us-gaap:StockRepurchasedDuringPeriodValue

us-gaap:StockRepurchasedDuringPeriodValue


Stock
Period End2020-09-302019-09-302019-06-302019-03-312018-09-302012-12-312012-09-302012-06-302012-03-31
Value4.00.00.00.00.00.00.00.018
Percentage of StockRepurchasedDuringPeriodValue100.00.00.00.00.00.00.00.0100.0

us-gaap:StockRepurchasedDuringPeriodValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2020-09-302019-09-302019-06-302019-03-312018-09-302012-12-312012-09-302012-06-302012-03-31
Value4.00.00.00.00.00.00.00.016
Percentage of StockRepurchasedDuringPeriodValue100.00.00.00.00.00.00.00.090.6

us-gaap:TaxesOther

us-gaap:TaxesOther


Taxes
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value157163159158146149140137
Percentage of TaxesOther100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:UnrealizedGainOnSecurities

us-gaap:UnrealizedGainOnSecurities


Unrealized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2001000211133183454871353553-150.0534.0543
Percentage of UnrealizedGainOnSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:UnrealizedLossOnSecurities

us-gaap:UnrealizedLossOnSecurities


Unrealized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-5.08.0-8.0-3.0-72.088-16.07.00.01523-1.05.018
Percentage of UnrealizedLossOnSecurities100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0

us-gaap:UtilitiesOperatingExpenseDepreciationAndAmortization

us-gaap:UtilitiesOperatingExpenseDepreciationAndAmortization


Utilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value528521499513473463446447439433443440377383376371365365332328322320296280274273262255255245256228243248231239226228194242229224219221211
Percentage of UtilitiesOperatingExpenseDepreciationAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses

us-gaap:UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses


Utilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value600584616579550579574580586597623593578557596541578586562590596577583565594585620568585560606575562529599531534510565532532510550509516
Percentage of UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

xel:BasisPointReduction dei:LegalEntity, us-gaap:PublicUtilitiesRegulatoryProceeding, us-gaap:RegulatoryAgency

xel:BasisPointReduction

xel:NSPMinnesotaandNSPWisconsinMember, xel:FERCProceedingMISOROEComplaint, xel:FederalEnergyRegulatoryCommissionFERC


Basis
Period End2021-03-31
Value0
Percentage of BasisPointReduction0.0

xel:ConservationandDemandSideManagementProgramExpenses

xel:ConservationandDemandSideManagementProgramExpenses


Conservationand
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value71737373687473756572
Percentage of ConservationandDemandSideManagementProgramExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

xel:CostofnaturalGasSoldandTransported

xel:CostofnaturalGasSoldandTransported


Costofnatural
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value21829926454862852725511247930658
Percentage of CostofnaturalGasSoldandTransported100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

xel:CreditLossesTopic326ASCTopic326

xel:CreditLossesTopic326ASCTopic326


Credit
Period End2020-12-312020-09-302020-06-302020-03-31
Value-4000000.0002000000.0
Percentage of CreditLossesTopic326ASCTopic326100.00.00.0100.0

xel:CreditLossesTopic326ASCTopic326 us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Credit
Period End2020-12-312020-09-302020-06-302020-03-312020-01-01
Value-4000000.0002000000.02000000.0
Percentage of CreditLossesTopic326ASCTopic326100.00.00.0100.00.0

xel:Customerrefundofpreviouslyrecoveredpurchasedpowercosts dei:LegalEntity

xel:Customerrefundofpreviouslyrecoveredpurchasedpowercosts

xel:NspMinnesota


Customerrefundofpreviouslyrecoveredpurchasedpowercostsdei:
Period End2021-01-312019-01-31
Value1720
Percentage of Customerrefundofpreviouslyrecoveredpurchasedpowercosts100.0100.0

xel:Customerrefundofpreviouslyrecoveredpurchasedpowercosts dei:LegalEntity, us-gaap:SubsequentEventType

xel:NspMinnesota, us-gaap:SubsequentEvent


Customerrefundofpreviouslyrecoveredpurchasedpowercostsdei:
Period End2021-01-31
Value17
Percentage of Customerrefundofpreviouslyrecoveredpurchasedpowercosts100.0

xel:DefinedBenefitPlanCreditsNotRecognizedDueToEffectsofRegulation us-gaap:RetirementPlanType

xel:DefinedBenefitPlanCreditsNotRecognizedDueToEffectsofRegulation

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value01000000.01000000.01000000.01000000.00001000000.0
Percentage of DefinedBenefitPlanCreditsNotRecognizedDueToEffectsofRegulation0.0100.0100.0100.0100.00.00.00.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value0-1000000.04000000.01000000.02000000.001000000.01000000.0-50000000.0
Percentage of DefinedBenefitPlanCreditsNotRecognizedDueToEffectsofRegulation0.0-100.0400.0100.0200.00.00.00.0-5000.0

xel:DefinedBenefitPlanNetBenefitCostCreditRecognizedBeforeRegulatoryAdjustments us-gaap:RetirementPlanType

xel:DefinedBenefitPlanNetBenefitCostCreditRecognizedBeforeRegulatoryAdjustments

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value-1.0-1.0-1.0-1.0-1.0-1.00.0-1.0-1.0-1.0-1.0-1.0-1.0-1.0-0.882-0.706-1.0-1.0-1.145-0.951
Percentage of DefinedBenefitPlanNetBenefitCostCreditRecognizedBeforeRegulatoryAdjustments100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value27272727272733282828629031311153434343434
Percentage of DefinedBenefitPlanNetBenefitCostCreditRecognizedBeforeRegulatoryAdjustments-2700.0-2700.0-2700.0-2700.0-2700.0-2700.00.0-2800.0-2800.0-2800.0-6200.0-9000.0-3100.0-3100.0-13097.5-4838.5-3400.0-3400.0-2980.5-3606.5

xel:DerivativeInstrumentsGainLossReclassifiedToRegulatoryAssetsAndLiabilitiesNet us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

xel:DerivativeInstrumentsGainLossReclassifiedToRegulatoryAssetsAndLiabilitiesNet

xel:ElectricCommodityContract, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value112.0-2.0-3.04.00.02612-5.0-2.037-4.0-7.24517-1.2990.79447-2.491-16.642-8.631-0.318-2.868.0375.123-9.605-6.6294.57420
Percentage of DerivativeInstrumentsGainLossReclassifiedToRegulatoryAssetsAndLiabilitiesNet100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

xel:NaturalGasCommodity, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-09-302020-06-302019-09-302019-06-302019-03-312018-09-30
Value-1.01.02.0-3.0-3.0-2.04.0-2.0
Percentage of DerivativeInstrumentsGainLossReclassifiedToRegulatoryAssetsAndLiabilitiesNet-9.150.0-66.70.00.0-7.733.3100.0

xel:DerivativeInstrumentsGainLossReclassifiedToRegulatoryAssetsAndLiabilitiesNet us-gaap:HedgingDesignation

us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value10.03.0-14.0-1.0-3.00.0-3.024166.0-4.037-3.0-10.32415-2.984-5.36759-2.491-16.642-20.297-7.327-2.868.05913-14.448-6.6294.57439
Percentage of DerivativeInstrumentsGainLossReclassifiedToRegulatoryAssetsAndLiabilitiesNet90.9150.0700.033.30.00.00.092.3133.3-120.0200.0100.075.0142.588.3229.7-675.9125.9100.0100.0235.22304.1100.0100.3272.4150.4100.0100.0191.0

xel:EffectiveIncomeTaxRateReconciliationNetOperatingLossCarrybackPercent

xel:EffectiveIncomeTaxRateReconciliationNetOperatingLossCarrybackPercent


Effective
Period End2020-12-312020-09-30
Value-0.9-1.9
Percentage of EffectiveIncomeTaxRateReconciliationNetOperatingLossCarrybackPercent100.0100.0

xel:EffectiveIncomeTaxRateReconciliationOtherRegulatoryItemsPercent

xel:EffectiveIncomeTaxRateReconciliationOtherRegulatoryItemsPercent


Effective
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-6.6-6.1-0.2-7.2-0.071-0.0840.072-0.056-0.055-0.057-0.003-0.006-0.01-0.010-0.008-0.009-0.005
Percentage of EffectiveIncomeTaxRateReconciliationOtherRegulatoryItemsPercent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0

xel:ElectricFuelandPurchasedPower

xel:ElectricFuelandPurchasedPower


Electric
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value104713869019818337978319528139149471040
Percentage of ElectricFuelandPurchasedPower100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

xel:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityNetLossesGainsRecognizedAsRegulatoryAssetsAndLiabilities us-gaap:DerivativeInstrumentRisk

xel:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityNetLossesGainsRecognizedAsRegulatoryAssetsAndLiabilities

us-gaap:CommodityContract


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value4414-3.02.09.01.02.02.010.0-11.0-20.00.022-7.0-9.879293.3765.38718331.9665.263-0.9833.966-11.953-24.64711-17.705-11.758344.946-0.571-3.093.504
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityNetLossesGainsRecognizedAsRegulatoryAssetsAndLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

xel:FinanceLeaseCost

xel:FinanceLeaseCost


Finance
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-30
Value6.06.06.08.06.06.07.0
Percentage of FinanceLeaseCost100.0100.0100.0100.0100.0100.0100.0

xel:IncreaseDecreaseinAccruedUnbilledRevenues

xel:IncreaseDecreaseinAccruedUnbilledRevenues


Increase
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value109000000.0-123000000.0-27000000.052000000.0-149000000.0-17000000.0-23000000.0-92000000.0
Percentage of IncreaseDecreaseinAccruedUnbilledRevenues100.0100.0100.0100.0100.0100.0100.0100.0

xel:Inventorytransferstoplantpropertyandequipment

xel:Inventorytransferstoplantpropertyandequipment


Inventorytransferstoplantpropertyandequipment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value21222556161332424221855391916
Percentage of Inventorytransferstoplantpropertyandequipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

xel:NaturalGasCombineCycleFacilityOutput dei:LegalEntity, us-gaap:PublicUtilityRegulatedOrUnregulatedStatus

xel:NaturalGasCombineCycleFacilityOutput

xel:MECHoldingsLLC, us-gaap:UnregulatedOperation


Natural
Period End2020-09-30
Value0
Percentage of NaturalGasCombineCycleFacilityOutput0.0

xel:NuclearFuelAmortization

xel:NuclearFuelAmortization


Nuclear
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value26302929323330312731303031312630263027313225233320282231312821262127232923262531182527282325
Percentage of NuclearFuelAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

xel:Pretaxgainslossesreclassifiedintoincomeduringtheperiodfromregulatoryassetsandliabilities us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

xel:Pretaxgainslossesreclassifiedintoincomeduringtheperiodfromregulatoryassetsandliabilities

xel:ElectricCommodityContract, us-gaap:Nondesignated


Pretaxgainslossesreclassifiedintoincomeduringtheperiodfromregulatoryassetsandliabilitiesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-3.0-3.0-3.03.03.04.0-1.00.0-1.01.00.03.0-3.05.5653.1222.3153.99838-2.491-16.642-8.631
Percentage of Pretaxgainslossesreclassifiedintoincomeduringtheperiodfromregulatoryassetsandliabilities100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

xel:NaturalGasCommodity, us-gaap:Nondesignated


Pretaxgainslossesreclassifiedintoincomeduringtheperiodfromregulatoryassetsandliabilitiesus-gaap:
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value0.0-8.00.00.05.00.00.01.0
Percentage of Pretaxgainslossesreclassifiedintoincomeduringtheperiodfromregulatoryassetsandliabilities-0.0266.70.00.0125.0-0.00.0-100.0

xel:Pretaxgainslossesreclassifiedintoincomeduringtheperiodfromregulatoryassetsandliabilities us-gaap:HedgingDesignation

us-gaap:Nondesignated


Pretaxgainslossesreclassifiedintoincomeduringtheperiodfromregulatoryassetsandliabilitiesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-3.0-11.06.03.03.01.02.01.00.00.09.00.03.0-5.03.643.1222.3152.92334-2.491-16.642-20.297
Percentage of Pretaxgainslossesreclassifiedintoincomeduringtheperiodfromregulatoryassetsandliabilities100.0366.7-200.0100.0100.025.00.0-100.00.0-0.0900.00.0100.0166.765.4100.0100.073.191.6100.0100.0235.2

xel:ProvisionForBadDebts

xel:ProvisionForBadDebts


Provision
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-30
Value131413131313
Percentage of ProvisionForBadDebts100.0100.0100.0100.0100.0100.0

xel:PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfDebt

xel:PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfDebt


Public
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-30
Value6.05.09.0111210.010.07.010.010.0131311119.641107.6137.0226.8227.5326.6845.996.9087.0316.1656.1448.7939.948
Percentage of PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

xel:PublicUtilitiesROENewBaseComplaintNumber1 dei:LegalEntity, us-gaap:PublicUtilitiesRegulatoryProceeding, us-gaap:RegulatoryAgency

xel:PublicUtilitiesROENewBaseComplaintNumber1

xel:NSPMinnesotaandNSPWisconsinMember, xel:FERCProceedingMISOROEComplaint, xel:FederalEnergyRegulatoryCommissionFERC


Public
Period End2021-03-31
Value0
Percentage of PublicUtilitiesROENewBaseComplaintNumber10.0

xel:PublicUtilitiesROEdevelopedwithnewapproach dei:LegalEntity, us-gaap:PublicUtilitiesRegulatoryProceeding, us-gaap:RegulatoryAgency

xel:PublicUtilitiesROEdevelopedwithnewapproach

xel:NSPMinnesotaandNSPWisconsinMember, xel:FERCProceedingMISOROEComplaint, xel:FederalEnergyRegulatoryCommissionFERC


Public
Period End2021-03-31
Value0
Percentage of PublicUtilitiesROEdevelopedwithnewapproach0.0

xel:RegulatedOperatingRevenueElectric

xel:RegulatedOperatingRevenueElectric


Regulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value259728702372294122862203223027712249232523002802
Percentage of RegulatedOperatingRevenueElectric100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

xel:RegulatedOperatingRevenueElectric us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:IntersegmentElimination, us-gaap:ElectricityUsRegulated


Regulated
Period End2020-09-302020-06-302019-12-312019-09-302019-06-302018-12-31
Value1.01.00.00.01.00.0
Percentage of RegulatedOperatingRevenueElectric0.00.00.00.00.00.0

us-gaap:OperatingSegments, us-gaap:ElectricityUsRegulated


Regulated
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value294122862203223027712249232523002802
Percentage of RegulatedOperatingRevenueElectric100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, xel:RegulatedElectric


Regulated
Period End2021-06-302021-03-312020-06-302020-03-31
Value2597287022862203
Percentage of RegulatedOperatingRevenueElectric100.0100.0100.0100.0

xel:RevenuesIncludingIntersegmentRevenues us-gaap:StatementBusinessSegments

xel:RevenuesIncludingIntersegmentRevenues

us-gaap:ElectricityUsRegulated


Revenues
Period End2020-09-302020-06-302019-12-312019-09-302019-06-302018-12-31
Value294222872230277122502300
Percentage of RevenuesIncludingIntersegmentRevenues100.0100.0100.0100.0100.0100.0

us-gaap:NaturalGasUsRegulated


Revenues
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value219281583545222308795559
Percentage of RevenuesIncludingIntersegmentRevenues7.412.30.024.48.013.70.024.3

xel:RegulatedElectric


Revenues
Period End2021-06-302020-06-302019-06-302018-06-30
Value2598228722502348
Percentage of RevenuesIncludingIntersegmentRevenues0.0100.0100.00.0

xel:UtilityMoneyPoolArrangementAverageLoanOutstanding us-gaap:ConsolidatedEntities

xel:UtilityMoneyPoolArrangementAverageLoanOutstanding

srt:ParentCompany


Utility
Period End2020-12-312019-12-312018-12-31
Value1853559
Percentage of UtilityMoneyPoolArrangementAverageLoanOutstanding100.0100.0100.0

xel:UtilityMoneyPoolArrangementMaximumLoanOutstanding us-gaap:ConsolidatedEntities

xel:UtilityMoneyPoolArrangementMaximumLoanOutstanding

srt:ParentCompany


Utility
Period End2020-12-312019-12-312018-12-31
Value318125172
Percentage of UtilityMoneyPoolArrangementMaximumLoanOutstanding100.0100.0100.0

dei:EntityCommonStockSharesOutstanding

dei:EntityCommonStockSharesOutstanding


Entity
Period End2021-02-11
Value537
Percentage of EntityCommonStockSharesOutstanding100.0

us-gaap:AccountsReceivableGrossCurrent

us-gaap:AccountsReceivableGrossCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value103910459959658598978928757861030915909856921849859808832827802735778776793726882884814793939797838766839769753698776811806730773
Percentage of AccountsReceivableGrossCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccrualForEnvironmentalLossContingenciesGross dei:LegalEntity, us-gaap:EnvironmentalRemediationSite

us-gaap:AccrualForEnvironmentalLossContingenciesGross

xel:NSPWisconsin, xel:AshlandMgpSite


Accrual
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-31
Value19202122232226272728293330314662648495949495108112107106113115104101101103
Percentage of AccrualForEnvironmentalLossContingenciesGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedDeferredInvestmentTaxCredit

us-gaap:AccumulatedDeferredInvestmentTaxCredit


Accumulated
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value454647484950515254545657585960616364656768697072737476777979808182838485868889919299
Percentage of AccumulatedDeferredInvestmentTaxCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax


Accumulated
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value-85000000.0-80000000.0-60000000.0-48000000.0-51151000.0-54862000.0-57628000.0-59753000.0-60322000.0-60883000.0-61533000.0-61241000.0-64170000.0-55710000.0-20165000.0-45738000.0-38370000.0-7582000.0-7692000.0-8094000.0-8806000.0-9590000.0-5783000.0-6435000.0-13113000.0-1416000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent


Allowance
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value9186796660585554495655534853525149515048464951515055575450545351475051495357585451525456
Percentage of AllowanceForDoubtfulAccountsReceivableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AlternativeInvestment us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:AlternativeInvestment

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring, xel:CommingledFunds, xel:NuclearDecommissioningFund


Alternative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312017-12-31
Value116410521041956897843935988937819659
Percentage of AlternativeInvestment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AlternativeInvestment us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring, xel:NuclearDecommissioningFund


Alternative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312018-09-302017-12-31
Value116410521041956897843935988937819704659
Percentage of AlternativeInvestment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0

us-gaap:AssetRetirementObligation

us-gaap:AssetRetirementObligation


Asset
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value28842701256824752782260824461815171916519698811135
Percentage of AssetRetirementObligation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetRetirementObligation dei:LegalEntity, xel:AssetRetirementObligationsByClassOfProperty

xel:NspMinnesota, us-gaap:NuclearPlant


Asset
Period End2020-12-312019-12-31
Value19572068
Percentage of AssetRetirementObligation67.976.6

us-gaap:AssetRetirementObligation xel:AssetRetirementObligationsByClassOfProperty

us-gaap:ElectricDistribution


Asset
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value46444221201312122427
Percentage of AssetRetirementObligation1.61.61.60.80.70.50.50.71.41.7

us-gaap:GasGatheringAndProcessingEquipment


Asset
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value3.03.04.04.04.3093.9663.9250.5750.0
Percentage of AssetRetirementObligation0.10.10.20.20.20.20.20.00.0

us-gaap:NuclearPlant


Asset
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value1957206819681874224921412037162815461482
Percentage of AssetRetirementObligation67.976.676.675.780.882.183.389.789.989.8

xel:CommonandOtherPropertyCommonMiscellaneous


Asset
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value1.01.01.01.01.2221.6341.5341.4580.6210.599
Percentage of AssetRetirementObligation0.00.00.00.00.00.10.10.10.00.0

xel:ElectricPlantSteamAndOtherProductionAsbestos


Asset
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value2642021777788846950455493
Percentage of AssetRetirementObligation9.27.56.93.13.23.22.82.82.63.39.7

xel:ElectricPlantWindProduction


Asset
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value36014611996927138373540387.751
Percentage of AssetRetirementObligation12.55.44.63.93.32.71.62.12.12.54.00.9

xel:NaturalGasPlantGasTransmissionAndDistribution


Asset
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value2522362492822041551491.1981.1271.0590.9960.936
Percentage of AssetRetirementObligation8.78.79.711.47.46.06.10.10.10.10.10.1

xel:Nonutilityandother


Asset
Period End2020-12-312019-12-312018-12-312017-12-31
Value1.01.01.00.0
Percentage of AssetRetirementObligation0.00.00.00.0

us-gaap:AssetRetirementObligationsNoncurrent

us-gaap:AssetRetirementObligationsNoncurrent


Asset
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value30592980288429422881273427012679264725992568257225342504247528832849281527822703267126392608255025172476244619221897183818151785176217411719171616951662165112931277985969881
Percentage of AssetRetirementObligationsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType

us-gaap:AssetsFairValueDisclosure

us-gaap:FairValueInputsLevel1, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring, xel:RabbiTrust


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value107104102827873827867
Percentage of AssetsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:InvestmentType

us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring, xel:RabbiTrust


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value949492757474747268
Percentage of AssetsFairValueDisclosure87.990.490.291.594.9101.490.292.3101.5

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring, xel:RabbiTrust


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value107104102827873827867
Percentage of AssetsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecurities us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:AvailableForSaleSecurities

us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring, xel:CommingledFunds, xel:NuclearDecommissioningFund


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value800795787773766756733815802774758
Percentage of AvailableForSaleSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring, xel:CommingledFunds, xel:NuclearDecommissioningFund


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value116410521041956897843935997988937898
Percentage of AvailableForSaleSecurities145.5132.3132.3123.7117.1111.5127.6122.3123.2121.1118.5

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue


Available
Period End2021-06-302021-03-312020-12-312020-09-302018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312010-12-31
Value2102022112082062042092051799591838079898110710999122121118115109103133137114256
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue


Available
Period End2021-06-302021-03-312020-12-312020-09-302018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312010-12-31
Value1531331161091111141121027958474444412119455150545446444549706639212
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue


Available
Period End2021-06-302021-03-312020-12-312020-09-302018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312010-12-31
Value2922482572411261291271298147424752516364171169172225223225222199175175156108167
Percentage of AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate


Available
Period End2021-06-302021-03-312020-12-312020-09-302018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value657586585559458454451441344205181176177173175165326330323405400393386358
Percentage of AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue

us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue


Available
Period End2021-06-302021-03-312020-12-312020-09-302018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312010-12-31
Value2.03.01.01.0157.03.05.03.8342.8240.3540.6080.2570.2610.1510.1531.260.3611.1892.1931.112.9153.3994.3343.4245.5242.270.03.372
Percentage of AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0

us-gaap:AvailableForSaleSecuritiesDebtSecurities us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:AvailableForSaleSecuritiesDebtSecurities

us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring, us-gaap:DebtSecurities, xel:NuclearDecommissioningFund


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value641573572546531488495484473464436441
Percentage of AvailableForSaleSecuritiesDebtSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueInputsLevel3, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring, us-gaap:DebtSecurities, xel:NuclearDecommissioningFund


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value1613131310.013131214160.00.0
Percentage of AvailableForSaleSecuritiesDebtSecurities2.52.32.32.41.92.72.62.53.03.40.00.0

us-gaap:AvailableForSaleSecuritiesDebtSecurities us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency, us-gaap:FinancialInstrument, us-gaap:InvestmentType

us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring, us-gaap:DebtSecurities, xel:NuclearDecommissioningFund


Available
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value612562528519513514489489485484466438
Percentage of AvailableForSaleSecuritiesDebtSecurities95.598.192.395.196.6105.398.8101.0102.5104.3106.999.3

us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring, us-gaap:DebtSecurities, xel:NuclearDecommissioningFund