EXC


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

Table of contents



us-gaap:CommonStockValue
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:SharesIssued

us-gaap:CommonStockSharesOutstanding
dei:LegalEntity, us-gaap:StatementClassOfStock
us-gaap:ConsolidatedEntities

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:ComprehensiveIncomeNetOfTax
dei:LegalEntity

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
dei:LegalEntity

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
dei:LegalEntity

us-gaap:CostOfGoodsAndServicesSoldDepreciationAndAmortization
dei:LegalEntity
dei:LegalEntity, us-gaap:PublicUtility
us-gaap:PublicUtility

us-gaap:CostsAndExpenses
dei:LegalEntity

us-gaap:GainLossOnInvestments
dei:LegalEntity

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
dei:LegalEntity
dei:LegalEntity, us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:IncomeTaxExpenseBenefit

us-gaap:InterestExpense
dei:LegalEntity
dei:LegalEntity
us-gaap:NetIncomeLoss

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest
dei:LegalEntity

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:NonoperatingIncomeExpense
dei:LegalEntity

us-gaap:OperatingExpenses
dei:LegalEntity, us-gaap:ConsolidationItems
dei:LegalEntity, us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
dei:LegalEntity, us-gaap:PublicUtility
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingIncomeLoss
dei:LegalEntity

us-gaap:OtherComprehensiveIncomeLossNetOfTax
dei:LegalEntity
dei:LegalEntity, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:OtherNonoperatingIncomeExpense
dei:LegalEntity

us-gaap:ProfitLoss
dei:LegalEntity, us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByAssetClass
us-gaap:RealizedInvestmentGainsLosses

us-gaap:RegulatedOperatingRevenue
dei:LegalEntity

us-gaap:Revenues
dei:LegalEntity
dei:LegalEntity, us-gaap:ConsolidationItems
dei:LegalEntity, us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
dei:LegalEntity, us-gaap:PublicUtilityRegulatedOrUnregulatedStatus
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:MajorCustomers, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:Assets

us-gaap:Liabilities
dei:LegalEntity
dei:LegalEntity, exc:UnconsolidatedEntity
dei:LegalEntity, exc:UnconsolidatedEntity, exc:VariableInterestEntitiesbyInterestType
dei:LegalEntity, exc:VariableInterestEntitiesbyInterestType, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
dei:LegalEntity, us-gaap:ConsolidatedEntities
dei:LegalEntity, us-gaap:ConsolidatedEntities, us-gaap:RecourseStatus
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities, us-gaap:RecourseStatus
exc:UnconsolidatedEntity
exc:UnconsolidatedEntity, exc:VariableInterestEntitiesbyInterestType
exc:VariableInterestEntitiesbyInterestType, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:RecourseStatus
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities, us-gaap:RecourseStatus

us-gaap:LiabilitiesAndStockholdersEquity
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:StockholdersEquity
dei:LegalEntity
dei:LegalEntity, us-gaap:StatementEquityComponents
us-gaap:ConsolidatedEntities

us-gaap:AssetsCurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:ConsolidatedEntities
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
dei:LegalEntity, us-gaap:AssetsSoldUnderAgreementsToRepurchaseMaturityPeriods, us-gaap:BalanceSheetLocation
us-gaap:Cash
dei:LegalEntity, us-gaap:AssetsSoldUnderAgreementsToRepurchaseMaturityPeriods, us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency
us-gaap:AssetsSoldUnderAgreementsToRepurchaseMaturityPeriods, us-gaap:BalanceSheetLocation
us-gaap:AssetsSoldUnderAgreementsToRepurchaseMaturityPeriods, us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency

us-gaap:CashAndCashEquivalentsAtCarryingValue
dei:LegalEntity
dei:LegalEntity, us-gaap:ConsolidatedEntities
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
dei:LegalEntity
dei:LegalEntity, exc:HeldForSale
exc:HeldForSale

us-gaap:AccountsReceivableNetCurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:ConsolidatedEntities
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
dei:LegalEntity
us-gaap:InventoryNet

us-gaap:OtherAssetsCurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:ConsolidatedEntities
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
dei:LegalEntity, us-gaap:ConsolidatedEntities
us-gaap:AssetsNoncurrent
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:PropertyPlantAndEquipmentGross
dei:LegalEntity
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PropertyPlantAndEquipmentByType
dei:LegalEntity, us-gaap:PublicUtility, us-gaap:RestructuringCostAndReserve
us-gaap:ConstructionInProgressGross
us-gaap:PublicUtility, us-gaap:RestructuringCostAndReserve

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
dei:LegalEntity
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType

us-gaap:AmortizationOfIntangibleAssets
dei:LegalEntity

us-gaap:PropertyPlantAndEquipmentNet
dei:LegalEntity
dei:LegalEntity, us-gaap:ConsolidatedEntities
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
dei:LegalEntity, us-gaap:PublicUtility, us-gaap:RestructuringCostAndReserve
us-gaap:ConsolidatedEntities
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:PublicUtility, us-gaap:RestructuringCostAndReserve

us-gaap:LongTermInvestments
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
us-gaap:ConsolidatedEntities, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:Goodwill
dei:LegalEntity

us-gaap:FiniteLivedIntangibleAssetsNet
dei:LegalEntity, us-gaap:FiniteLivedIntangibleAssetsByMajorClass
dei:LegalEntity, us-gaap:BalanceSheetLocation
us-gaap:OperatingLeaseRightOfUseAsset
dei:LegalEntity, us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:BalanceSheetLocation
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:OtherAssetsNoncurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:ConsolidatedEntities
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
dei:LegalEntity, us-gaap:ConsolidatedEntities
us-gaap:OtherAssets
dei:LegalEntity, us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:AccountsPayableCurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:ConsolidatedEntities
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:AccruedLiabilitiesCurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:ConsolidatedEntities
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:ContractWithCustomerLiabilityCurrent
dei:LegalEntity

us-gaap:LiabilitiesCurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:ConsolidatedEntities
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:LongTermDebtCurrent
dei:LegalEntity

us-gaap:OtherLiabilitiesCurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:BalanceSheetLocation
dei:LegalEntity, us-gaap:ConsolidatedEntities
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:BalanceSheetLocation
us-gaap:ConsolidatedEntities
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:TaxesPayableCurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:ConsolidatedEntities
us-gaap:LiabilitiesNoncurrent
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:LongTermDebt
dei:LegalEntity
dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:ConsolidatedEntities
us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:LongTermDebtNoncurrent
us-gaap:ConsolidatedEntities
us-gaap:DeferredTaxLiabilitiesNoncurrent
us-gaap:RetirementPlanType
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

us-gaap:MinorityInterest

us-gaap:OtherLiabilitiesNoncurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:BalanceSheetLocation
dei:LegalEntity, us-gaap:ConsolidatedEntities
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:BalanceSheetLocation
us-gaap:ConsolidatedEntities
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo
dei:LegalEntity

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree
dei:LegalEntity

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour
dei:LegalEntity

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive
dei:LegalEntity

us-gaap:OperatingLeaseLiability
dei:LegalEntity
dei:LegalEntity, us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue
dei:LegalEntity

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount
dei:LegalEntity

us-gaap:StockholdersEquity
dei:LegalEntity
dei:LegalEntity, us-gaap:StatementEquityComponents
us-gaap:ConsolidatedEntities

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue
dei:LegalEntity
us-gaap:ConsolidatedEntities
dei:LegalEntity
us-gaap:AdditionalPaidInCapital

us-gaap:RetainedEarningsAccumulatedDeficit
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:TreasuryStockValue

us-gaap:MinorityInterest

us-gaap:NetCashProvidedByUsedInOperatingActivities
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInInvestingActivities
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInFinancingActivities
dei:LegalEntity

us-gaap:CashAndCashEquivalentsPeriodIncreaseDecrease
dei:LegalEntity

us-gaap:DepreciationDepletionAndAmortization
dei:LegalEntity, us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:IncreaseDecreaseInInventories
dei:LegalEntity

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInOperatingActivities
dei:LegalEntity
dei:LegalEntity
us-gaap:NetIncomeLoss

us-gaap:ProfitLoss

us-gaap:NetCashProvidedByUsedInInvestingActivities
dei:LegalEntity

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment
dei:LegalEntity
dei:LegalEntity, us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:NetCashProvidedByUsedInFinancingActivities
dei:LegalEntity

us-gaap:ProceedsFromIssuanceOfLongTermDebt
dei:LegalEntity

us-gaap:RepaymentsOfLongTermDebt
dei:LegalEntity

us-gaap:PaymentsOfDividendsCommonStock
dei:LegalEntity

us-gaap:EffectiveIncomeTaxRateContinuingOperations
dei:LegalEntity
us-gaap:IncomeTaxAuthority
us-gaap:IncomeTaxAuthority, us-gaap:SubsequentEventType
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice

us-gaap:UnrecognizedTaxBenefits
dei:LegalEntity
dei:LegalEntity
us-gaap:LitigationReserveCurrent
dei:LegalEntity, us-gaap:LossContingenciesByNatureOfContingency
dei:LegalEntity, us-gaap:LossContingenciesByNatureOfContingency, us-gaap:SubsequentEventType
dei:LegalEntity, us-gaap:RelatedPartyTransactionsByRelatedParty
exc:AccountsReceivableRelatedPartiesPurchase
dei:LegalEntity, us-gaap:RelatedPartyTransactionsByRelatedParty
exc:AccountsReceivableRelatedPartiesSale
dei:LegalEntity, us-gaap:PublicUtility, us-gaap:RestructuringCostAndReserve
exc:AssetRetirementObligationContractualOffset
us-gaap:PublicUtility, us-gaap:RestructuringCostAndReserve
dei:LegalEntity, us-gaap:PublicUtilitiesRegulatoryProceeding
exc:BasispointsforComEdsRevenueRequirement
dei:LegalEntity, us-gaap:PublicUtility
exc:CapacityOfFacilityOfCompanyOwnedSolarDistributionGenerationFacilities
us-gaap:PublicUtility
dei:LegalEntity, us-gaap:PublicUtilitiesRegulatoryProceeding
exc:CaponEquityComponentofRateofReturnonCommonEquityinFederalEnergyRegulatoryCommitteeComplaint

exc:ChangeinCapitalExpendituresIncurredButNotYetPaid
dei:LegalEntity
dei:LegalEntity
exc:ChangeinReceivablesFromPayablesToAffiliatesNet

exc:ChangesInOptionPremiumsCollectedReceived
dei:LegalEntity
dei:LegalEntity, us-gaap:PublicUtility
exc:DecommissioningRelatedActivitiesNotContractuallyOffset
us-gaap:PublicUtility

exc:DeferredPaymentsForLegalSettlements
dei:LegalEntity

exc:DefinedBenefitPlanAmountsRecognizedInRegulatoryAssetsBeforeTax

exc:DefinedBenefitPlanAmountsRecognizedInRegulatoryLiabilitiesBeforeTax
dei:LegalEntity, us-gaap:StatementEquityComponents
exc:EarningsReclassification

exc:EffectiveIncomeTaxRateReconciliationChangeinEnactedTaxLawPercent
dei:LegalEntity

exc:EffectiveIncomeTaxRateReconciliationDeferredProsecutionAgreementpayments
dei:LegalEntity

exc:EffectiveIncomeTaxRateReconciliationQualifiedDecommissioningInvestmentIncomePercent
dei:LegalEntity
dei:LegalEntity, us-gaap:SubsequentEventType
exc:EnergyEfficiencyAnnualCumulativeSavings

exc:EnergyRelatedOptions
dei:LegalEntity
dei:LegalEntity, us-gaap:Range
exc:ExpectedGenerationHedgedInNextTwelveMonths
dei:LegalEntity, us-gaap:Range
exc:ExpectedGenerationHedgedInYearTwo
dei:LegalEntity, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
exc:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityGainLossChangeInCollateral
dei:LegalEntity, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel
dei:LegalEntity, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
exc:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisIncludedInNoncurrentPayablesToAffiliates
dei:LegalEntity, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:ConsolidationItems, us-gaap:FairValueByFairValueHierarchyLevel
dei:LegalEntity, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
exc:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisIncludedInRegulatoryassets
us-gaap:ConsolidationItems, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel

exc:GainLossInvestmentIncomeNuclearDecommissioningTrustFunds
dei:LegalEntity
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
exc:IntersegmentRevenueNetOfPurchasePowerAndFuel
dei:LegalEntity, us-gaap:PublicUtility, us-gaap:RestructuringCostAndReserve
exc:NuclearFuelAmortization
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:PublicUtility, us-gaap:RestructuringCostAndReserve

exc:OtherDecommissioningRelatedActivity
dei:LegalEntity
dei:LegalEntity, us-gaap:PublicUtilitiesRegulatoryProceeding
exc:PublicUtilitiesRequestedRateIncreaseDecreasePriorYearAnnualReconciliation

exc:RealizedGainLossInvestmentIncomeNuclearDecommissioningTrustFundsNonregulatoryAccounting
dei:LegalEntity

exc:RealizedGainLossInvestmentIncomeNuclearDecommissioningTrustFundsRegulatoryAccounting
dei:LegalEntity

exc:RegulatoryOffsetNuclearDecommissioningTrustFundActivity
dei:LegalEntity
dei:LegalEntity, us-gaap:RelatedPartyTransactionsByRelatedParty
exc:RelatedPartyTransactionCapitalizedCostsSupportServices
us-gaap:RelatedPartyTransactionsByRelatedParty
dei:LegalEntity, us-gaap:PublicUtilitiesRegulatoryProceeding
exc:Revenue
dei:LegalEntity, us-gaap:PublicUtilitiesRegulatoryProceeding, us-gaap:SubsequentEventType
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
exc:RevenueNetOfPurchasePowerAndFuelFromExternalCustomers
us-gaap:StatementBusinessSegments
exc:RevenueNetofPurchasePowerAndFuel
dei:LegalEntity, us-gaap:TransactionType
exc:TransferofFinancialAssetsAccountedforasSaleAdditionalTransfers
us-gaap:TransactionType

exc:TrueupAdjustmentstoDecouplingMechanismsandFormulaRates
dei:LegalEntity

exc:UnrealizedGainLossNuclearDecommissioningTrustFundsNonregulatoryAccounting
dei:LegalEntity

exc:UnrealizedGainLossNuclearDecommissioningTrustFundsRegulatoryAccounting
dei:LegalEntity

us-gaap:AccountsReceivablePurchase
dei:LegalEntity

us-gaap:AccountsReceivableSale
dei:LegalEntity
dei:LegalEntity
us-gaap:AdjustmentsToAdditionalPaidInCapitalOther
dei:LegalEntity, us-gaap:LossContingenciesByNatureOfContingency
dei:LegalEntity, us-gaap:LossContingenciesByNatureOfContingency, us-gaap:SubsequentEventType
dei:LegalEntity, us-gaap:StatementEquityComponents
dei:LegalEntity, us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
us-gaap:AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
dei:LegalEntity, us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
us-gaap:AllowanceForDoubtfulAccountsReceivableWriteOffs
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

us-gaap:AmortizationOfNuclearFuelLease
dei:LegalEntity

us-gaap:AmortizationOfPowerContractsEmissionCredits
dei:LegalEntity

us-gaap:AmortizationOfRegulatoryAsset
dei:LegalEntity
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:AssetImpairmentCharges

us-gaap:AssetRetirementObligationAccretionExpense
dei:LegalEntity
dei:LegalEntity, us-gaap:PublicUtility
us-gaap:PublicUtility
dei:LegalEntity, us-gaap:PublicUtility
us-gaap:AssetRetirementObligationCashPaidToSettle
us-gaap:PublicUtility
dei:LegalEntity, us-gaap:PublicUtility
us-gaap:AssetRetirementObligationPeriodIncreaseDecrease
dei:LegalEntity, us-gaap:Range, us-gaap:PublicUtility
us-gaap:PublicUtility
us-gaap:Range, us-gaap:PublicUtility
dei:LegalEntity, us-gaap:PublicUtility, us-gaap:RestructuringCostAndReserve
us-gaap:AssetRetirementObligationRevisionOfEstimate

us-gaap:CashFlowsBetweenTransfereeAndTransferorProceedsFromCollectionsReinvestedInRevolvingPeriodTransfers
dei:LegalEntity

us-gaap:CashFlowsBetweenTransfereeAndTransferorProceedsFromNewTransfers
dei:LegalEntity

us-gaap:CashFlowsBetweenTransferorAndTransfereeBeneficialInterest
dei:LegalEntity

us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:ContractWithCustomerAssetCumulativeCatchUpAdjustmentToRevenueChangeInMeasureOfProgress
dei:LegalEntity

us-gaap:ContractWithCustomerAssetIncreaseDecreaseForContractAcquiredInBusinessCombination
dei:LegalEntity

us-gaap:ContractWithCustomerAssetReclassifiedToReceivable
dei:LegalEntity

us-gaap:ContractWithCustomerLiabilityCumulativeCatchUpAdjustmentToRevenueModificationOfContract
dei:LegalEntity

us-gaap:ContractWithCustomerLiabilityIncreaseDecreaseForContractAcquiredInBusinessCombination
dei:LegalEntity

us-gaap:ContractWithCustomerLiabilityRevenueRecognized
dei:LegalEntity

us-gaap:ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod
dei:LegalEntity
dei:LegalEntity, us-gaap:ProductOrService
us-gaap:CostDirectMaterial
us-gaap:ProductOrService

us-gaap:CostsIncurredAssetRetirementObligationIncurred
dei:LegalEntity

us-gaap:DebtAndEquitySecuritiesUnrealizedGainLoss
dei:LegalEntity
dei:LegalEntity, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:DeconsolidationGainOrLossAmount
us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:DeferredIncomeTaxesAndTaxCredits
dei:LegalEntity
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets

us-gaap:DefinedBenefitPlanContributionsByEmployer
dei:LegalEntity
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanInterestCost

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost
us-gaap:RetirementPlanType
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanServiceCost
dei:LegalEntity
us-gaap:DefinedContributionPlanEmployerDiscretionaryContributionAmount

us-gaap:Depreciation
dei:LegalEntity

us-gaap:DepreciationAmortizationAndAccretionNet
dei:LegalEntity
dei:LegalEntity
us-gaap:DistributionMadeToLimitedLiabilityCompanyLLCMemberCashDistributionsDeclared
dei:LegalEntity, us-gaap:StatementEquityComponents

us-gaap:DividendsCommonStockCash
dei:LegalEntity
dei:LegalEntity, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
dei:LegalEntity

us-gaap:EffectiveIncomeTaxRateReconciliationDeductionsOther
dei:LegalEntity

us-gaap:EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense
dei:LegalEntity

us-gaap:EffectiveIncomeTaxRateReconciliationOtherAdjustments
dei:LegalEntity

us-gaap:EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
dei:LegalEntity

us-gaap:EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment
dei:LegalEntity

us-gaap:EffectiveIncomeTaxRateReconciliationTaxCreditsOther
dei:LegalEntity

us-gaap:EffectiveIncomeTaxRateReconciliationTaxSettlements
dei:LegalEntity

us-gaap:EmployeeBenefitsAndShareBasedCompensationNoncash
dei:LegalEntity
us-gaap:FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInEarnings
dei:LegalEntity, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
dei:LegalEntity, us-gaap:FairValueByFairValueHierarchyLevel
dei:LegalEntity, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:IncomeStatementLocation
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:IncomeStatementLocation
dei:LegalEntity, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
dei:LegalEntity, us-gaap:FairValueByFairValueHierarchyLevel
dei:LegalEntity, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:IncomeStatementLocation
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:IncomeStatementLocation
dei:LegalEntity, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
dei:LegalEntity, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel
dei:LegalEntity, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
dei:LegalEntity, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel
dei:LegalEntity, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
dei:LegalEntity, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel
dei:LegalEntity, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
dei:LegalEntity, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel
dei:LegalEntity, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
dei:LegalEntity, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel
dei:LegalEntity, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPeriodIncreaseDecrease

us-gaap:GainLossOnSaleOfOtherAssets
dei:LegalEntity

us-gaap:GainLossOnSalesOfAssetsAndAssetImpairmentCharges
dei:LegalEntity

us-gaap:ImpairmentOfLongLivedAssetsHeldForUse
dei:LegalEntity
dei:LegalEntity, us-gaap:PublicUtility
us-gaap:PublicUtility
dei:LegalEntity, us-gaap:PublicUtility
us-gaap:ImpairmentOfLongLivedAssetsToBeDisposedOf
dei:LegalEntity, us-gaap:Range, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:PublicUtility
us-gaap:Range, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions
dei:LegalEntity

us-gaap:IncreaseDecreaseCashCollateralFromCounterparties
dei:LegalEntity
dei:LegalEntity
us-gaap:IncreaseDecreaseDueFromAffiliates

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
dei:LegalEntity

us-gaap:IncreaseDecreaseInAccruedIncomeTaxesPayable
dei:LegalEntity
dei:LegalEntity, us-gaap:IncomeTaxAuthority
us-gaap:IncreaseDecreaseInDeferredIncomeTaxes
us-gaap:IncomeTaxAuthority
dei:LegalEntity
us-gaap:IncreaseDecreaseInDueToAffiliatesCurrent
dei:LegalEntity
us-gaap:IncreaseDecreaseInOtherRegulatoryAssets
dei:LegalEntity, us-gaap:RegulatoryAsset

us-gaap:IncreaseDecreaseInPensionPlanObligations

us-gaap:IncreaseDecreaseInPostretirementObligations

us-gaap:IncreaseDecreaseInReceivables
dei:LegalEntity
dei:LegalEntity
us-gaap:IncreaseDecreaseInRegulatoryLiabilities
dei:LegalEntity, us-gaap:RegulatoryLiability
dei:LegalEntity
us-gaap:IncreaseInRestrictedCash
dei:LegalEntity, us-gaap:SubsequentEventType

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:InterestExpenseBorrowings
dei:LegalEntity

us-gaap:InterestExpenseRelatedParty
dei:LegalEntity

us-gaap:InterestRevenueExpenseNet
dei:LegalEntity, us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:InventoryWriteDown
dei:LegalEntity

us-gaap:MinorityInterestPeriodIncreaseDecrease
dei:LegalEntity
dei:LegalEntity, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:OperatingLeaseLeaseIncomeLeasePayments
dei:LegalEntity

us-gaap:OperatingLeaseVariableLeaseIncome
dei:LegalEntity

us-gaap:OperatingLeasesIncomeStatementDepreciationExpenseOnPropertySubjectToOrHeldForLease
dei:LegalEntity

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
dei:LegalEntity

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax
us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossTax

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
dei:LegalEntity
dei:LegalEntity, us-gaap:PublicUtility
us-gaap:OtherCostAndExpenseOperating
dei:LegalEntity, us-gaap:PublicUtility, us-gaap:RestructuringCostAndReserve
dei:LegalEntity, us-gaap:Range, us-gaap:PublicUtility, us-gaap:SubsequentEventType
us-gaap:PublicUtility
us-gaap:Range, us-gaap:PublicUtility, us-gaap:SubsequentEventType

us-gaap:OtherLaborRelatedExpenses
dei:LegalEntity

us-gaap:OtherNoncashIncomeExpense
dei:LegalEntity

us-gaap:OtherOperatingIncome
dei:LegalEntity, us-gaap:RegulatoryLiability
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:ProductOrService
us-gaap:ConsolidationItems, us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ProductOrService

us-gaap:PaymentsForProceedsFromOtherInvestingActivities
dei:LegalEntity
dei:LegalEntity
us-gaap:PaymentsOfDistributionsToAffiliates

us-gaap:PaymentsToAcquireOtherInvestments
dei:LegalEntity

us-gaap:PensionAndOtherPostretirementBenefitContributions
dei:LegalEntity

us-gaap:PensionAndOtherPostretirementBenefitExpense
dei:LegalEntity
dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:RetirementPlanType

us-gaap:ProceedsFromCollectionOfRetainedInterestInSecuritizedReceivables
dei:LegalEntity
dei:LegalEntity
us-gaap:ProceedsFromContributionsFromAffiliates
dei:LegalEntity
us-gaap:ProceedsFromContributionsFromParent
dei:LegalEntity, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:ProceedsFromDivestitureOfBusinesses
us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities
dei:LegalEntity

us-gaap:ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess
dei:LegalEntity

us-gaap:ProceedsFromSaleAndMaturityOfOtherInvestments
dei:LegalEntity

us-gaap:ProceedsFromSaleOfPropertyHeldForSale
dei:LegalEntity

us-gaap:ProceedsFromShortTermDebtMaturingInMoreThanThreeMonths
dei:LegalEntity

us-gaap:ProceedsFromStockPlans

us-gaap:ProvisionForDoubtfulAccounts
dei:LegalEntity
dei:LegalEntity, us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

us-gaap:PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity
dei:LegalEntity
dei:LegalEntity, us-gaap:StatementOperatingActivitiesSegment
us-gaap:StatementOperatingActivitiesSegment
dei:LegalEntity, us-gaap:PublicUtilitiesRegulatoryProceeding
us-gaap:PublicUtilitiesApprovedEquityCapitalStructurePercentage
dei:LegalEntity, exc:Period, exc:PublicUtilitiesApprovedRateIncreaseDecreaseOffsets, us-gaap:PublicUtilitiesRegulatoryProceeding
us-gaap:PublicUtilitiesApprovedRateIncreaseDecreaseAmount
dei:LegalEntity, exc:Period, us-gaap:PublicUtilitiesRegulatoryProceeding
dei:LegalEntity, exc:PublicUtilitiesApprovedRateIncreaseDecreaseTaxBenefits, us-gaap:PublicUtilitiesRegulatoryProceeding
dei:LegalEntity, us-gaap:PublicUtilitiesRegulatoryProceeding
dei:LegalEntity, us-gaap:PublicUtilitiesRegulatoryProceeding, us-gaap:SubsequentEventType
dei:LegalEntity
us-gaap:PublicUtilitiesApprovedReturnOnEquityPercentage
dei:LegalEntity, us-gaap:PublicUtilitiesRegulatoryProceeding
dei:LegalEntity, us-gaap:PublicUtilitiesRegulatoryProceeding, us-gaap:SubsequentEventType
dei:LegalEntity, us-gaap:PublicUtilitiesRegulatoryProceeding
us-gaap:PublicUtilitiesInterimRateIncreaseDecreaseAmount
dei:LegalEntity, us-gaap:PublicUtilitiesRegulatoryProceeding
us-gaap:PublicUtilitiesRequestedEquityCapitalStructurePercentage
dei:LegalEntity, exc:Period, us-gaap:PublicUtilitiesRegulatoryProceeding
us-gaap:PublicUtilitiesRequestedRateIncreaseDecreaseAmendedAmount
dei:LegalEntity, us-gaap:PublicUtilitiesRegulatoryProceeding
dei:LegalEntity, us-gaap:PublicUtilitiesRegulatoryProceeding, us-gaap:SubsequentEventType
dei:LegalEntity, us-gaap:PublicUtilitiesRegulatoryProceeding
us-gaap:PublicUtilitiesRequestedRateIncreaseDecreaseAmount
dei:LegalEntity, us-gaap:PublicUtilitiesRegulatoryProceeding, us-gaap:SubsequentEventType
dei:LegalEntity, us-gaap:PublicUtilitiesRegulatoryProceeding
us-gaap:PublicUtilitiesRequestedReturnOnEquityPercentage
dei:LegalEntity, us-gaap:PublicUtilitiesRegulatoryProceeding, us-gaap:SubsequentEventType

us-gaap:RealEstateTaxExpense
dei:LegalEntity
us-gaap:StatementEquityComponents
us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
dei:LegalEntity
us-gaap:RelatedPartyTransactionAmountsOfTransaction
dei:LegalEntity
us-gaap:RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
dei:LegalEntity, us-gaap:RelatedPartyTransactionsByRelatedParty
dei:LegalEntity
us-gaap:RelatedPartyTransactionPurchasesFromRelatedParty
dei:LegalEntity, us-gaap:RelatedPartyTransactionsByRelatedParty
dei:LegalEntity, us-gaap:PublicUtility, us-gaap:RestructuringCostAndReserve
us-gaap:RestructuringAndRelatedCostIncurredCost
us-gaap:PublicUtility, us-gaap:RestructuringCostAndReserve

us-gaap:RestructuringCosts
dei:LegalEntity
dei:LegalEntity, us-gaap:PublicUtility, us-gaap:RestructuringCostAndReserve
us-gaap:RestructuringReserveAcceleratedDepreciation
us-gaap:PublicUtility, us-gaap:RestructuringCostAndReserve

us-gaap:RevenueFromRelatedParties

us-gaap:SecuritizationFinancialAssetForWhichTransferIsAccountedAsSaleGainLossOnSale
dei:LegalEntity

us-gaap:StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensationGross

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensationGross
us-gaap:StatementEquityComponents

us-gaap:SupplementalDeferredPurchasePrice
dei:LegalEntity

us-gaap:TaxAdjustmentsSettlementsAndUnusualProvisions
dei:LegalEntity

us-gaap:TaxesExcludingIncomeAndExciseTaxes
dei:LegalEntity

us-gaap:UnrealizedGainLossOnDerivatives
dei:LegalEntity
dei:LegalEntity, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
dei:LegalEntity, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation

us-gaap:UnrealizedGainLossOnInvestments
dei:LegalEntity
dei:LegalEntity, exc:InvestmentsInEquity, us-gaap:FairValueByMeasurementFrequency
exc:InvestmentsInEquity, us-gaap:FairValueByMeasurementFrequency
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:UnrealizedGainLossOnSecurities
us-gaap:StatementBusinessSegments

us-gaap:UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses
dei:LegalEntity

us-gaap:UtilitiesOperatingExpenseTaxes
dei:LegalEntity

dei:EntityCommonStockSharesOutstanding
dei:LegalEntity
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
exc:AHFSUnrestrictedAsset
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

exc:AccruedCompensationCurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType
exc:AggregateBankCommitmentsUnderUnsecuredRevolvingCreditFacilities
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
dei:LegalEntity, us-gaap:SubsequentEventType, us-gaap:TransactionType
exc:AgreementCashProceeds
dei:LegalEntity, us-gaap:SubsequentEventType, us-gaap:TransactionType
exc:AgreementLiabilitiesRecorded
dei:LegalEntity
exc:AllocationOfFederalTaxBenefitUnderTaxSharingAgreement
dei:LegalEntity, us-gaap:IncomeTaxAuthority

exc:COVID19RegulatoryAsset
dei:LegalEntity

exc:CashCollateralHeld
dei:LegalEntity
dei:LegalEntity, us-gaap:FairValueByFairValueHierarchyLevel
exc:CashCollateralPosted
us-gaap:FairValueByFairValueHierarchyLevel
dei:LegalEntity, us-gaap:StatementClassOfStock
exc:CommonStockSharesReservedForWarrantConversion

exc:DeferredIncomeTaxLiabilitiesAndAccumulatedDeferredInvestmentTaxCredit
dei:LegalEntity

exc:DeferredTaxLiabilitiesDeferredPensionAndOtherPostretirementBenefitObligation
dei:LegalEntity
us-gaap:RetirementPlanType
exc:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeAndRegulatoryAssetsBeforeTaxNotYetRecognized
us-gaap:RetirementPlanType
exc:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeAndRegulatoryAssetsGainsLossesBeforeTax
us-gaap:RetirementPlanType
exc:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeAndRegulatoryAssetsPriorServiceCostCreditBeforeTax
us-gaap:Range, us-gaap:RetirementPlanName, us-gaap:RetirementPlanType
exc:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRateDesignChanges
us-gaap:RetirementPlanType
exc:DefinedBenefitPlanExpectedFutureBenefitPaymentsTotal
us-gaap:RetirementPlanType
exc:DefinedBenefitPlanRegulatoryAssetsBeforeTax

exc:DefinedOtherPostretirementBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYear
dei:LegalEntity
dei:LegalEntity, exc:CreditRiskExposure
exc:EnergyCooperativesAndMunicipalities
dei:LegalEntity
exc:EstimatedLitigationLiabilityCurrentDueWithin30Days
dei:LegalEntity
exc:EstimatedLitigationLiabilityCurrentDueWithin90Days
dei:LegalEntity
exc:EstimatedLitigationLiabilityCurrentDuewithin30days
dei:LegalEntity
exc:EstimatedLitigationLiabilityCurrentDuewithin90days
us-gaap:ConsolidatedEntities
exc:FairValueAdjustmentOutstanding
dei:LegalEntity, us-gaap:Range, us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:ValuationTechnique
exc:FairValueInputsForwardGasPriceAssets
us-gaap:Range, us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:ValuationTechnique
dei:LegalEntity, us-gaap:Range, us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:ValuationTechnique
exc:FairValueInputsForwardPowerPriceAssets
us-gaap:Range, us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:ValuationTechnique
dei:LegalEntity, us-gaap:FairValueByAssetClass
exc:FairValueNetAssetsLiabilitiesExcludedFromNuclearDecommissioningTrustFundInvestments
dei:LegalEntity, us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByAssetClass
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency
dei:LegalEntity, exc:CreditRiskExposure
exc:FinancialInstitutionsCreditRiskExposure

exc:ForwardGasBasis
dei:LegalEntity

exc:ForwardPowerBasis
dei:LegalEntity

exc:IncrementalCollateralForLossOfInvestmentGradeCreditRating
dei:LegalEntity
dei:LegalEntity, exc:CreditRiskExposure
exc:InvestmentGradeExternalCreditRating
dei:LegalEntity, exc:CreditRiskExposure
exc:InvestmentGradeInternalCreditRating
dei:LegalEntity, exc:UnconsolidatedEntity
exc:InvestmentsInNonconsolidatedVariableInterestEntities
dei:LegalEntity, exc:UnconsolidatedEntity, exc:VariableInterestEntitiesbyInterestType
dei:LegalEntity, exc:VariableInterestEntitiesbyInterestType, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
exc:UnconsolidatedEntity
exc:UnconsolidatedEntity, exc:VariableInterestEntitiesbyInterestType
exc:VariableInterestEntitiesbyInterestType, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
dei:LegalEntity, exc:CreditRiskExposure
exc:InvestorOwnedUtilitiesMarketersAndPowerProducersCreditRiskExposure

exc:LettersOfCreditHeld
dei:LegalEntity
dei:LegalEntity, exc:MarketParticipant
exc:MarketPaymentShortfallInCollections
dei:LegalEntity, us-gaap:PublicUtility
us-gaap:PublicUtility
dei:LegalEntity
exc:MarylandReliefActFunds
dei:LegalEntity
exc:MutualInsuranceTotalRetrospectivePremiumObligation
dei:LegalEntity, us-gaap:GuaranteeObligationsByNature
exc:MutualPropertyInsuranceDistributionToMembers
dei:LegalEntity
exc:MutualPropertyInsuranceMaximumRecoveryLimitForMultipleLosses
dei:LegalEntity
exc:MutualReplacementPowerCostInsuranceMaximumRetrospectivePremiumObligation

exc:NetAssetsPendingTransactionsExcluded

exc:NetInterestReceivablePayableRelatedToUncertainTaxPositions
dei:LegalEntity, exc:CreditRiskExposure
exc:NonInvestmentGradeExternalCreditRating
dei:LegalEntity, exc:CreditRiskExposure
exc:NoninvestmentGradeInternalCreditRating
dei:LegalEntity
exc:NuclearFuelFabricationAndInstallationStage
dei:LegalEntity, us-gaap:GuaranteeObligationsByNature
exc:NuclearInsuranceAnnualCoverageLimit
dei:LegalEntity
exc:NuclearInsuranceFinancialProtectionPoolMaximumAnnualAssessmentPayment
dei:LegalEntity
exc:NuclearInsuranceFinancialProtectionPoolValue
dei:LegalEntity, exc:CreditRiskExposure
exc:OtherCreditRiskExposure
dei:LegalEntity, exc:VariableInterestEntitiesbyInterestType, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
exc:OtherNonconsolidatedVariableInterestEntityOwnershipInterests
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
exc:VariableInterestEntitiesbyInterestType, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:RetirementPlanType
exc:OtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
exc:PPEunrestrictedasset
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType
exc:PropertyPlantAndEquipmentDepreciationAsPercentOfAverageServiceLifeRate
us-gaap:PropertyPlantAndEquipmentByType
dei:LegalEntity
exc:ProposedCapitalExpenditure

exc:QualifiedDefinedBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYear
dei:LegalEntity

exc:RenewableEnergyCreditsCurrent
dei:LegalEntity
dei:LegalEntity, exc:CreditRiskExposure
exc:TotalCreditRiskExposure
us-gaap:ConsolidatedEntities
exc:TotalDeferredDebitsAndOtherAssets
dei:LegalEntity
exc:TotalLongTermDebtWithAdjustments
dei:LegalEntity, us-gaap:TransactionType
exc:TransferOfFinancialAssetsAccountedForAsSalesCashOutflowsReturnedForAssetsDerecognizedAmount
us-gaap:TransactionType
dei:LegalEntity, us-gaap:SubsequentEventType, us-gaap:TransactionType
exc:UndividedInterestSold
dei:LegalEntity
srt:PayablesToCustomers

us-gaap:AccountsPayableOtherCurrent

us-gaap:AccountsPayableRelatedPartiesCurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:RelatedPartyTransactionsByRelatedParty
dei:LegalEntity
us-gaap:AccountsPayableRelatedPartiesNoncurrent
dei:LegalEntity, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:AccountsReceivableGrossCurrent
dei:LegalEntity
dei:LegalEntity
us-gaap:AccountsReceivableRelatedPartiesCurrent
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:RelatedPartyTransactionsByRelatedParty
dei:LegalEntity
us-gaap:AccountsReceivableRelatedPartiesNoncurrent

us-gaap:AccrualForEnvironmentalLossContingenciesGross
dei:LegalEntity
dei:LegalEntity, exc:AccrualForEnvironmentalLossContingenciesMaterialComponents
dei:LegalEntity, us-gaap:EnvironmentalRemediationSite
exc:AccrualForEnvironmentalLossContingenciesMaterialComponents
us-gaap:EnvironmentalRemediationSite
dei:LegalEntity
us-gaap:AccruedLiabilitiesAndOtherLiabilities

us-gaap:AccumulatedDeferredInvestmentTaxCredit
dei:LegalEntity
dei:LegalEntity, us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:AcquiredFiniteLivedIntangibleAssetResidualValue
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:AdditionalCollateralAggregateFairValue
dei:LegalEntity
dei:LegalEntity, us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
us-gaap:AllowanceForDoubtfulAccountsReceivable
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent
dei:LegalEntity

us-gaap:AllowanceForDoubtfulOtherReceivablesCurrent
dei:LegalEntity
us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:FairValueByMeasurementFrequency, us-gaap:RetirementPlanType
us-gaap:AlternativeInvestment
us-gaap:FairValueByMeasurementFrequency, us-gaap:RetirementPlanType
dei:LegalEntity, us-gaap:PublicUtility
us-gaap:AssetRetirementObligation
dei:LegalEntity, us-gaap:PublicUtility, us-gaap:RestructuringCostAndReserve
us-gaap:PublicUtility
us-gaap:PublicUtility, us-gaap:RestructuringCostAndReserve
dei:LegalEntity, us-gaap:PublicUtility
us-gaap:AssetRetirementObligationCurrent
us-gaap:PublicUtility

us-gaap:AssetRetirementObligationsNoncurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:ConsolidatedEntities
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
dei:LegalEntity, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:AssetsFairValueDisclosure
dei:LegalEntity, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency

us-gaap:AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:ConsolidatedEntities
dei:LegalEntity, us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
dei:LegalEntity, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:AvailableForSaleSecuritiesNoncurrent
us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsDisposalGroupIncludingDiscontinuedOperations
dei:LegalEntity
dei:LegalEntity
us-gaap:CashCollateralForBorrowedSecurities
dei:LegalEntity
us-gaap:ClassOfWarrantOrRightOutstanding
dei:LegalEntity, us-gaap:ShortTermDebtType
us-gaap:CommercialPaper
us-gaap:ShortTermDebtType
dei:LegalEntity
us-gaap:CommonEquityTierOneCapitalRatio
dei:LegalEntity, us-gaap:Range

us-gaap:ContractWithCustomerAssetNetCurrent
dei:LegalEntity

us-gaap:ContractWithCustomerLiability
dei:LegalEntity
dei:LegalEntity
us-gaap:ContractWithCustomerRefundLiabilityCurrent

us-gaap:CostMethodInvestments
dei:LegalEntity
dei:LegalEntity, exc:CreditRiskExposure
us-gaap:CreditDerivativeMaximumExposureUndiscounted
dei:LegalEntity
us-gaap:CustomerDepositsCurrent

us-gaap:DebtInstrumentCarryingAmount
dei:LegalEntity
dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType
dei:LegalEntity, us-gaap:LongtermDebtType
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:LongtermDebtType
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType

us-gaap:DebtInstrumentCollateralAmount
dei:LegalEntity
dei:LegalEntity, us-gaap:PublicUtility, us-gaap:SubsequentEventType
us-gaap:PublicUtility, us-gaap:SubsequentEventType

us-gaap:DebtInstrumentFairValue
dei:LegalEntity
dei:LegalEntity, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
dei:LegalEntity, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

us-gaap:DebtInstrumentUnamortizedDiscountPremiumNet
dei:LegalEntity
us-gaap:ConsolidatedEntities
dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:DebtWeightedAverageInterestRate
us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:DecommissioningFundInvestments
dei:LegalEntity
dei:LegalEntity, us-gaap:ConsolidatedEntities
dei:LegalEntity, us-gaap:FairValueByAssetClass
dei:LegalEntity, us-gaap:FairValueByAssetClass, us-gaap:PublicUtility
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:FairValueByAssetClass
us-gaap:FairValueByAssetClass, us-gaap:PublicUtility
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible
dei:LegalEntity
dei:LegalEntity, us-gaap:IncomeTaxAuthority
dei:LegalEntity, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:DeferredCompensationLiabilityCurrentAndNoncurrent
dei:LegalEntity, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency

us-gaap:DeferredCostsAndOtherAssets
dei:LegalEntity

us-gaap:DeferredCreditsAndOtherLiabilities
dei:LegalEntity
us-gaap:ConsolidatedEntities
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:DeferredCreditsAndOtherLiabilitiesNoncurrent
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
dei:LegalEntity
us-gaap:DeferredIncomeTaxAssetsNet

us-gaap:DeferredIncomeTaxLiabilities
dei:LegalEntity

us-gaap:DeferredIncomeTaxesAndOtherTaxLiabilitiesNoncurrent
dei:LegalEntity

us-gaap:DeferredTaxAssetsEquityMethodInvestments
dei:LegalEntity
dei:LegalEntity
us-gaap:DeferredTaxAssetsLiabilitiesNetNoncurrent
us-gaap:ConsolidatedEntities
dei:LegalEntity, us-gaap:IncomeTaxAuthority
us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
us-gaap:IncomeTaxAuthority

us-gaap:DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration
dei:LegalEntity

us-gaap:DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness
dei:LegalEntity

us-gaap:DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts
dei:LegalEntity

us-gaap:DeferredTaxLiabilitiesDerivatives
dei:LegalEntity

us-gaap:DeferredTaxLiabilitiesInvestments
dei:LegalEntity

us-gaap:DeferredTaxLiabilitiesOther
dei:LegalEntity

us-gaap:DeferredTaxLiabilitiesOtherFiniteLivedAssets
dei:LegalEntity

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment
dei:LegalEntity

us-gaap:DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities
dei:LegalEntity

us-gaap:DefinedBenefitPensionPlanLiabilitiesNoncurrent
us-gaap:ConsolidatedEntities
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmountsRecognizedInBalanceSheet
dei:LegalEntity
us-gaap:DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationWeightedAverageInterestCreditingRate
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:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear
dei:LegalEntity
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear
exc:DefinedBenefitPlanPensionPlansWithBenefitObligationsInExcessOfPlanAssets
us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation
exc:DefinedBenefitPlanPensionPlansWithBenefitObligationsInExcessOfPlanAssets
us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets
us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanPlanAssetsTargetAllocationPercentage
us-gaap:RetirementPlanType
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanUltimateHealthCareCostTrendRate1
dei:LegalEntity
us-gaap:DerivativeAssetFairValueGrossLiability
dei:LegalEntity, us-gaap:Range, us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:ValuationTechnique
us-gaap:DerivativeAssetLiabilityNetMeasurementInput
us-gaap:Range, us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:ValuationTechnique

us-gaap:DerivativeAssetNotionalAmount
dei:LegalEntity
dei:LegalEntity, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency

us-gaap:DerivativeAssetsCurrent

us-gaap:DerivativeAssetsNoncurrent

us-gaap:DerivativeCollateralObligationToReturnCash
dei:LegalEntity

us-gaap:DerivativeCollateralObligationToReturnSecurities
dei:LegalEntity

us-gaap:DerivativeCollateralRightToReclaimCash
dei:LegalEntity

us-gaap:DerivativeCollateralRightToReclaimSecurities
dei:LegalEntity
dei:LegalEntity, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:DerivativeFairValueAmountOffsetAgainstCollateralNet
dei:LegalEntity, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
dei:LegalEntity, us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel
dei:LegalEntity
us-gaap:DerivativeFairValueOfDerivativeLiability
dei:LegalEntity
us-gaap:DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
dei:LegalEntity, us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel
dei:LegalEntity
us-gaap:DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral

us-gaap:DerivativeFairValueOfDerivativeNet
dei:LegalEntity, us-gaap:DerivativeInstrumentRisk
dei:LegalEntity, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
dei:LegalEntity, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:DerivativeInstrumentRisk

us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue
dei:LegalEntity
dei:LegalEntity, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency

us-gaap:DerivativeLiabilitiesCurrent

us-gaap:DerivativeLiabilitiesNoncurrent

us-gaap:DerivativeNotionalAmount
dei:LegalEntity
dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:DerivativeInstrumentRisk, us-gaap:LongtermDebtType
dei:LegalEntity, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
dei:LegalEntity, us-gaap:FairValueByAssetClass
dei:LegalEntity, us-gaap:FairValueByMeasurementFrequency
dei:LegalEntity, us-gaap:HedgingDesignation
us-gaap:DebtInstrument, us-gaap:DerivativeInstrumentRisk, us-gaap:LongtermDebtType
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:FairValueByAssetClass
us-gaap:FairValueByMeasurementFrequency
us-gaap:HedgingDesignation
us-gaap:RetirementPlanType
dei:LegalEntity, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:DisposalGroupIncludingDiscontinuedOperationConsideration
us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
dei:LegalEntity
us-gaap:DueFromAffiliateCurrent
us-gaap:ConsolidatedEntities
us-gaap:DueFromAffiliateNoncurrent
us-gaap:ConsolidatedEntities, us-gaap:RelatedPartyTransactionsByRelatedParty
dei:LegalEntity, us-gaap:ConsolidatedEntities
us-gaap:DueFromAffiliates
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:DueFromRelatedPartiesCurrent
us-gaap:ConsolidatedEntities, us-gaap:RelatedPartyTransactionsByRelatedParty
dei:LegalEntity
us-gaap:DueToAffiliateCurrent

us-gaap:DueToAffiliateNoncurrent
dei:LegalEntity, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
dei:LegalEntity, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis
us-gaap:RelatedPartyTransactionsByRelatedParty
dei:LegalEntity, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:DueToRelatedPartiesCurrent
us-gaap:AwardType
us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions

us-gaap:EnergyMarketingAccountsPayable
dei:LegalEntity

us-gaap:EnergyMarketingContractLiabilitiesCurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:ConsolidatedEntities
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:EnergyMarketingContractLiabilitiesNoncurrent
dei:LegalEntity

us-gaap:EnergyMarketingContractsAssetsCurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:EnergyMarketingContractsAssetsNoncurrent
dei:LegalEntity
dei:LegalEntity, exc:UnrestrictedUnamortizedEnergyContracts, us-gaap:ConsolidatedEntities
dei:LegalEntity, us-gaap:ConsolidatedEntities
dei:LegalEntity, us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
exc:UnrestrictedUnamortizedEnergyContracts, us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:FairValueByAssetClass
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:EnergyRelatedInventoryNaturalGasInStorage
dei:LegalEntity
dei:LegalEntity, us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject
us-gaap:EnvironmentalCostsRecognizedCapitalized
exc:SubsidiaryCompanies
us-gaap:EquityMethodInvestmentOwnershipPercentage
us-gaap:ConsolidatedEntities, us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName
us-gaap:Range

us-gaap:EquitySecuritiesWithoutReadilyDeterminableFairValueAmount
dei:LegalEntity
dei:LegalEntity, us-gaap:FairValueByAssetClass
us-gaap:FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
us-gaap:FairValueByAssetClass
dei:LegalEntity, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
dei:LegalEntity, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel
dei:LegalEntity, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueNetAssetLiability
dei:LegalEntity, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency
dei:LegalEntity
us-gaap:FinanceLeaseLiability
dei:LegalEntity, us-gaap:LongtermDebtType
dei:LegalEntity
us-gaap:FinanceLeaseLiabilityCurrent
dei:LegalEntity
us-gaap:FinanceLeaseLiabilityNoncurrent
dei:LegalEntity
us-gaap:FinanceLeaseLiabilityPaymentsDue
dei:LegalEntity
us-gaap:FinanceLeaseLiabilityPaymentsDueAfterYearFive
dei:LegalEntity
us-gaap:FinanceLeaseLiabilityPaymentsDueNextTwelveMonths
dei:LegalEntity
us-gaap:FinanceLeaseLiabilityPaymentsDueYearFour
dei:LegalEntity
us-gaap:FinanceLeaseLiabilityPaymentsDueYearThree
dei:LegalEntity
us-gaap:FinanceLeaseLiabilityPaymentsDueYearTwo
dei:LegalEntity
us-gaap:FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear
dei:LegalEntity
us-gaap:FinanceLeaseLiabilityUndiscountedExcessAmount
dei:LegalEntity, us-gaap:BalanceSheetLocation
us-gaap:FinanceLeaseRightOfUseAsset
dei:LegalEntity, us-gaap:FairValueByAssetClass
us-gaap:FinancialInstrumentsSoldNotYetPurchasedCorporateDebt
dei:LegalEntity, us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByAssetClass
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency
us-gaap:RetirementPlanType
dei:LegalEntity, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FinancialLiabilitiesFairValueDisclosure
dei:LegalEntity, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization
dei:LegalEntity, us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
dei:LegalEntity

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
dei:LegalEntity

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
dei:LegalEntity

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
dei:LegalEntity

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
dei:LegalEntity

us-gaap:FiniteLivedIntangibleAssetsGross
dei:LegalEntity, us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:GoodwillGross
dei:LegalEntity

us-gaap:GuaranteeObligationsMaximumExposure
dei:LegalEntity

us-gaap:InterestPayableCurrent
dei:LegalEntity

us-gaap:InventoryRawMaterialsAndSuppliesNetOfReserves
dei:LegalEntity
dei:LegalEntity, us-gaap:ConsolidatedEntities
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
dei:LegalEntity, us-gaap:PublicUtility, us-gaap:RestructuringCostAndReserve
us-gaap:ConsolidatedEntities
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:PublicUtility, us-gaap:RestructuringCostAndReserve
dei:LegalEntity, us-gaap:PublicUtility, us-gaap:RestructuringCostAndReserve
us-gaap:InventoryRawMaterialsNetOfReserves
us-gaap:PublicUtility, us-gaap:RestructuringCostAndReserve
dei:LegalEntity, us-gaap:JointlyOwnedUtilityPlant, us-gaap:PublicUtility
us-gaap:JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInService
us-gaap:JointlyOwnedUtilityPlant, us-gaap:PublicUtility
dei:LegalEntity, us-gaap:JointlyOwnedUtilityPlant, us-gaap:PublicUtility
us-gaap:JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress
dei:LegalEntity, us-gaap:JointlyOwnedUtilityPlant, us-gaap:PublicUtility
us-gaap:JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciation
us-gaap:JointlyOwnedUtilityPlant, us-gaap:PublicUtility
dei:LegalEntity, us-gaap:JointlyOwnedUtilityPlant, us-gaap:PublicUtility
us-gaap:JointlyOwnedUtilityPlantProportionateOwnershipShare
dei:LegalEntity, us-gaap:PublicUtility
dei:LegalEntity, us-gaap:Range, us-gaap:LongtermDebtType
us-gaap:LesseeFinanceLeaseDiscountRate

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths
dei:LegalEntity

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear
dei:LegalEntity

us-gaap:LessorOperatingLeasePaymentsToBeReceived
dei:LegalEntity

us-gaap:LessorOperatingLeasePaymentsToBeReceivedFourYears
dei:LegalEntity

us-gaap:LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths
dei:LegalEntity

us-gaap:LessorOperatingLeasePaymentsToBeReceivedRemainderOfFiscalYear
dei:LegalEntity

us-gaap:LessorOperatingLeasePaymentsToBeReceivedThereafter
dei:LegalEntity

us-gaap:LessorOperatingLeasePaymentsToBeReceivedThreeYears
dei:LegalEntity

us-gaap:LessorOperatingLeasePaymentsToBeReceivedTwoYears
dei:LegalEntity

us-gaap:LettersOfCreditOutstandingAmount
dei:LegalEntity
dei:LegalEntity, us-gaap:CreditFacility
dei:LegalEntity, us-gaap:CreditFacility, us-gaap:ShortTermDebtType
dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType
dei:LegalEntity, us-gaap:ShortTermDebtType
us-gaap:ConsolidatedEntities
us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:ConsolidatedEntities
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:LiabilityForAsbestosAndEnvironmentalClaimsGross
dei:LegalEntity
dei:LegalEntity, exc:ClaimType
dei:LegalEntity
us-gaap:LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest
dei:LegalEntity, us-gaap:StatementEquityComponents
dei:LegalEntity
us-gaap:LineOfCreditFacilityCapacityAvailableForTradePurchases
us-gaap:ConsolidatedEntities, us-gaap:ShortTermDebtType
us-gaap:ShortTermDebtType

us-gaap:LineOfCreditFacilityCurrentBorrowingCapacity
dei:LegalEntity
dei:LegalEntity, us-gaap:DebtInstrument
us-gaap:LineOfCreditFacilityFairValueOfAmountOutstanding
dei:LegalEntity, us-gaap:ShortTermDebtType
dei:LegalEntity, us-gaap:CreditFacility, us-gaap:ShortTermDebtType
us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity
dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType
dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:ShortTermDebtType
dei:LegalEntity, us-gaap:ShortTermDebtType
dei:LegalEntity, us-gaap:TransactionType
us-gaap:ConsolidatedEntities, us-gaap:ConsolidationItems, us-gaap:ShortTermDebtType
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:ShortTermDebtType
us-gaap:TransactionType

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity
dei:LegalEntity
dei:LegalEntity, us-gaap:CreditFacility
dei:LegalEntity, us-gaap:CreditFacility, us-gaap:ShortTermDebtType
dei:LegalEntity, us-gaap:PublicUtility, us-gaap:SubsequentEventType
dei:LegalEntity, us-gaap:ShortTermDebtType
us-gaap:PublicUtility, us-gaap:SubsequentEventType

us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:ConsolidatedEntities
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
dei:LegalEntity

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
dei:LegalEntity

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:MarginDepositAssets
dei:LegalEntity
dei:LegalEntity, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency
dei:LegalEntity
us-gaap:MembersCapital
dei:LegalEntity
us-gaap:MembersEquity
dei:LegalEntity
us-gaap:MembersEquityAttributableToNoncontrollingInterest
dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:NonRecourseDebt
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
dei:LegalEntity, exc:UnconsolidatedEntity
us-gaap:NoncontrollingInterestInVariableInterestEntity
dei:LegalEntity, exc:UnconsolidatedEntity, exc:VariableInterestEntitiesbyInterestType
dei:LegalEntity, exc:VariableInterestEntitiesbyInterestType, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
exc:UnconsolidatedEntity
exc:UnconsolidatedEntity, exc:VariableInterestEntitiesbyInterestType
exc:VariableInterestEntitiesbyInterestType, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:NontradeReceivablesCurrent

us-gaap:NontradeReceivablesNoncurrent
dei:LegalEntity
us-gaap:NotesPayableRelatedPartiesClassifiedCurrent
dei:LegalEntity
us-gaap:NotesPayableRelatedPartiesNoncurrent
dei:LegalEntity, us-gaap:PublicUtility, us-gaap:RestructuringCostAndReserve
us-gaap:NuclearFuelNetOfAmortization
us-gaap:PublicUtility, us-gaap:RestructuringCostAndReserve
dei:LegalEntity, us-gaap:IncomeTaxAuthority
us-gaap:OperatingLossCarryforwards
us-gaap:IncomeTaxAuthority
dei:LegalEntity, us-gaap:IncomeTaxAuthority
us-gaap:OperatingLossCarryforwardsValuationAllowance
us-gaap:IncomeTaxAuthority

us-gaap:OtherCommitment

us-gaap:OtherCommitmentDueAfterFifthYear
dei:LegalEntity
dei:LegalEntity, us-gaap:OtherCommitments
us-gaap:OtherCommitments

us-gaap:OtherCommitmentDueInFifthYear
dei:LegalEntity
dei:LegalEntity, us-gaap:OtherCommitments
us-gaap:OtherCommitments

us-gaap:OtherCommitmentDueInFourthYear
dei:LegalEntity
dei:LegalEntity, us-gaap:OtherCommitments
us-gaap:OtherCommitments

us-gaap:OtherCommitmentDueInNextTwelveMonths
dei:LegalEntity
dei:LegalEntity, us-gaap:OtherCommitments
us-gaap:OtherCommitments

us-gaap:OtherCommitmentDueInSecondYear
dei:LegalEntity
dei:LegalEntity, us-gaap:OtherCommitments
us-gaap:OtherCommitments

us-gaap:OtherCommitmentDueInThirdYear
dei:LegalEntity
dei:LegalEntity, us-gaap:OtherCommitments
us-gaap:OtherCommitments

us-gaap:OtherCommitmentsFutureMinimumPaymentsRemainderOfFiscalYear
dei:LegalEntity
dei:LegalEntity, us-gaap:OtherCommitments
us-gaap:OtherCommitments
dei:LegalEntity
us-gaap:OtherLongTermDebtCurrent
us-gaap:ConsolidatedEntities

us-gaap:OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent
dei:LegalEntity
us-gaap:ConsolidatedEntities
dei:LegalEntity, us-gaap:ConsolidatedEntities
us-gaap:OtherReceivables
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:OtherReceivablesGrossCurrent
dei:LegalEntity

us-gaap:OtherReceivablesNetCurrent
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities
us-gaap:RetirementPlanType
dei:LegalEntity
us-gaap:PrepaidTaxes

us-gaap:PublicUtilitiesAmountOfAllowanceForEarningsOnEquityCapitalizedForRateMakingPurposes
dei:LegalEntity

us-gaap:PublicUtilitiesPropertyPlantAndEquipmentNet
dei:LegalEntity

us-gaap:RegulatoryAssets

us-gaap:RegulatoryAssetsCurrent

us-gaap:RegulatoryAssetsNoncurrent

us-gaap:RegulatoryLiabilities

us-gaap:RegulatoryLiabilityCurrent

us-gaap:RegulatoryLiabilityNoncurrent

us-gaap:RelatedPartyTransactionDueFromToRelatedPartyCurrent
dei:LegalEntity, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:RestrictedCashAndCashEquivalentsAtCarryingValue
dei:LegalEntity
dei:LegalEntity, us-gaap:ConsolidatedEntities
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:RestrictedCashAndCashEquivalentsNoncurrent
dei:LegalEntity
dei:LegalEntity
us-gaap:RetainedEarningsAppropriated
dei:LegalEntity, us-gaap:StatementEquityComponents
dei:LegalEntity
us-gaap:RetainedEarningsUnappropriated
dei:LegalEntity, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:RetainedInterestFairValueDisclosure
dei:LegalEntity, us-gaap:FairValueByMeasurementFrequency
dei:LegalEntity, us-gaap:TransactionType
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByMeasurementFrequency
us-gaap:TransactionType

us-gaap:RevenueRemainingPerformanceObligation
dei:LegalEntity
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
us-gaap:PlanName
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
us-gaap:AwardType
us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
dei:LegalEntity, us-gaap:DebtInstrument
us-gaap:ShortTermBankLoansAndNotesPayable

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

us-gaap:SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit
dei:LegalEntity, us-gaap:IncomeTaxAuthority

us-gaap:SpentNuclearFuelObligationNoncurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
dei:LegalEntity, us-gaap:FairValueByMeasurementBasis
dei:LegalEntity, us-gaap:PublicUtility
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis
us-gaap:PublicUtility
dei:LegalEntity, us-gaap:IncomeTaxAuthority, us-gaap:TaxCreditCarryforward
us-gaap:TaxCreditCarryforwardAmount
us-gaap:IncomeTaxAuthority, us-gaap:TaxCreditCarryforward
dei:LegalEntity, us-gaap:TransactionType
us-gaap:TransferOfFinancialAssetsAccountedForAsSalesAmountDerecognized
us-gaap:TransactionType
dei:LegalEntity, exc:ExpirationDateOfFacility, us-gaap:TransactionType
us-gaap:TransferOfFinancialAssetsAccountedForAsSalesCashProceedsReceivedForAssetsDerecognizedAmount
dei:LegalEntity, us-gaap:TransactionType
exc:ExpirationDateOfFacility, us-gaap:TransactionType
us-gaap:SubsequentEventType, us-gaap:TransactionType
us-gaap:TransactionType

us-gaap:TreasuryStockShares

us-gaap:UnamortizedDebtIssuanceExpense
dei:LegalEntity
dei:LegalEntity, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:ConsolidatedEntities

us-gaap:UnbilledContractsReceivable
dei:LegalEntity

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
dei:LegalEntity
dei:LegalEntity, us-gaap:ValuationAllowancesAndReservesType
us-gaap:ValuationAllowancesAndReservesBalance
us-gaap:ValuationAllowancesAndReservesType

Plots across concepts


IncomeStatement
Other Comprehensive Income Loss Net Of Tax
Expenses
Income Tax Expense Benefit
Balance Sheet
Finite Lived Intangible Assets Net
Assets
Cash And Cash Equivalents At Carrying Value
Current Assets
Cash And Cash Equivalents At Carrying Value
NonCurrent Assets
Finite Lived Intangible Assets Net
PropertyPlantAndEquipmentNet
Accumulated Depreciation Depletion And Amortization Property Plant And Equipment
Liabilities
Operating Lease Liability
Current Liabilities
Long Term Debt Current
Noncurrent Liabilities
Minority Interest
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 Financing Activities
NetCashProvidedByUsedInOperatingActivities
Inventory Write Down
NetCashProvidedByUsedInInvestingActivities
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInFinancingActivities
Net Cash Provided By Used In Financing Activities
Shares
Treasury Stock Shares
NonoperatingIncomeExpense
Nonoperating Income Expense
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Payments Due Year Four
FiniteLivedIntangibleAssets
Finite Lived Intangible Assets Net
AccountsReceivable
Allowance For Doubtful Accounts Receivable Current

Tables

  2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
us-gaap:CommonStockValue ██████▇▇▇▇▇▇▇▇▆▆▆▆▁▁▁▁▁▁▁▁▁19362.019336.019303.019238.019209.019171.019063.019008.018973.018964.018862.018860.018807.018794.018756.018722.018676.018647.016755.016731.016709.016679.016651.016751.016741.016716.016693.0
us-gaap:SharesIssued ▁▁▁▁▁█▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁977.405976.337976.24973.941973.417972786.0968.842967.739967.214965.168962.685961.92960.84958.778958.014957.616954.668954.545896.61895.979894.568894.208NANA892.034NANA
us-gaap:CommonStockSharesOutstanding ███▇▇▇▇▇▇▆▆▆▁▁976.0975.0974.0972.0972.0970.954879967.009746965.906701965.381919963.335888960.852473960.087898926.09666924.035059NANA919.924742NA861.24355861.24355859.833343NA893.9406858.721507857.290484856.563385856.563385
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding ████████▇▇▇▆▅▅▅▅▅▄▁▁▁▁▁▁▁▁▁977.0976.0976.0974.0974.0972.0970.0969.0968.0967.0965.0936.0930.0928.0927.0926.0924.0915.0866.0867.0868.0863.0864.0861.0860.0860.0860.0
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic ███████▇▇▇▇▆▅▅▅▅▅▄▁▁▁▁▁▁▁▁▁976.0976.0975.0973.0972.0971.0968.0967.0966.0964.0962.0934.0928.0925.0925.0924.0921.0913.0863.0862.0861.0861.0860.0858.0856.0857.0856.0
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount ██▁1.01.00.0NA0.00.02.02.0NANANANANANANANANA4.013.015.0NA2.016.018.0NA20.017.0
us-gaap:EarningsPerShareBasic ▃▃▃▄▃▄▄▃▃█▄▁▅▂▃▂▂▃▄▄▁▅▃▁▃▄▃0.510.530.60.790.50.930.760.560.611.940.860.091.070.220.530.290.340.690.740.80.021.150.610.10.60.860.57
us-gaap:EarningsPerShareDiluted ▃▃▃▄▃▄▄▃▃█▄▁▅▂▃▂▂▃▄▄▁▅▃▁▃▄▃0.510.530.60.790.50.930.760.560.61.930.850.091.070.220.530.290.330.690.740.80.021.150.60.10.590.860.57
  2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
 Cost Ratio dei:LegalEntity exc:AtlanticCityElectricCompany█▁▂█▂▂▇▁▃▂▆▂▂▂█▂▂▇▂▄420.0256.0276.0419.0274.0273.0406.0265.0310.0271.0370.0270.0275.0275.0421.0270.0291.0386.0285.0334.0NANANANANANANA
 Cost Ratio dei:LegalEntity exc:BaltimoreGasAndElectricCompany▃▁▆▂▂▇▃▂▇▄▃▂▆▄▄▂▃▃▁█▃▂▂█▄▃▂731.0616.0937.0703.0649.0976.0731.0662.0977.0813.0738.0674.0951.0812.0812.0680.0746.0725.0628.01036.0761.0697.0653.01054.0794.0737.0653.0
 Cost Ratio dei:LegalEntity exc:CommonwealthEdisonCo█▅▆▇▄▅▇▅▆▄▇▅▄▃▆▄▃▅▂▂▁▃▂▂▁▂▁1643.01417.01439.01583.01351.01408.01598.01398.01512.01309.01571.01357.01298.01223.01497.01286.01196.01376.01148.01185.01079.01222.01128.01134.01068.01156.01080.0
 Cost Ratio dei:LegalEntity exc:DelmarvaPowerandLightCompany▄▁▅▃▂▆▄▂▆▄▄▂▅▃▄▂▂▃▁█337.0267.0350.0319.0287.0380.0328.0289.0384.0330.0327.0282.0362.0303.0331.0281.0296.0314.0271.0421.0NANANANANANANA
 Cost Ratio dei:LegalEntity exc:ExelonGenerationCoLLC▄▂▅▅▃▆▆▄▇▄▅▃▅▃▅▁▃▅▃█▅▄▂▃▂▃▂4659.03880.04733.04774.04210.05296.05278.04579.05512.04654.04751.04174.04888.04388.05035.03589.04294.04768.04232.05840.04802.04412.03789.04390.03772.04255.04070.0
 Cost Ratio dei:LegalEntity exc:PecoEnergyCo▅▂▅▄▁▆▃▁▆▃▃▁▄▂▄▂▁▃▂█▃▂▂█▄▃▂813.0681.0813.0778.0655.0900.0757.0653.0866.0729.0715.0630.0796.0701.0788.0664.0645.0740.0661.0985.0750.0693.0656.0993.0805.0728.0672.0
 Cost Ratio dei:LegalEntity exc:PepcoHoldingsLLC█▁▄█▂▅█▂▆▃▇▂▄1368.01016.01171.01380.01091.01228.01361.01076.01251.01121.01310.01074.01175.0NANANANANANANANANANANANANANA
 Cost Ratio dei:LegalEntity exc:PotomacElectricPowerCompany▇▁▄█▃▅▇▃▄▂▆▂▃▁█▂▁▆▂▄611.0494.0544.0642.0531.0575.0628.0523.0557.0510.0604.0514.0530.0491.0635.0509.0488.0592.0504.0545.0NANANANANANANA
 EBT Margin dei:LegalEntity exc:AtlanticCityElectricCompany█▁▂█▂▂▇▁▃▂▆▂▂▂█▂420.0256.0276.0419.0274.0273.0406.0265.0310.0271.0370.0270.0275.0275.0421.0270.0NANANANANANANANANANANA
 EBT Margin dei:LegalEntity exc:BaltimoreGasAndElectricCompany▃▁▇▃▂█▃▂█▅▃▂▇▅▅▂731.0616.0937.0703.0649.0976.0731.0662.0977.0813.0738.0674.0951.0812.0812.0680.0NANANANANANANANANANANA
 EBT Margin dei:LegalEntity exc:CommonwealthEdisonCo█▄▅▇▃▄▇▄▆▂▇▃▂▁▆▂1643.01417.01439.01583.01351.01408.01598.01398.01512.01309.01571.01357.01298.01223.01497.01286.0NANANANANANANANANANANA
 EBT Margin dei:LegalEntity exc:DelmarvaPowerandLightCompany▅▁▆▄▂█▅▂█▅▅▂▇▃▅▂337.0267.0350.0319.0287.0380.0328.0289.0384.0330.0327.0282.0362.0303.0331.0281.0NANANANANANANANANANANA
 EBT Margin dei:LegalEntity exc:ExelonGenerationCoLLC▅▂▅▅▃▇▇▅█▅▅▃▆▄▆▁4659.03880.04733.04774.04210.05296.05278.04579.05512.04654.04751.04174.04888.04388.05035.03589.0NANANANANANANANANANANA
 EBT Margin dei:LegalEntity exc:PecoEnergyCo▆▂▆▅▂█▄▂▇▄▃▁▅▃▅▂813.0681.0813.0778.0655.0900.0757.0653.0866.0729.0715.0630.0796.0701.0788.0664.0NANANANANANANANANANANA
 EBT Margin dei:LegalEntity exc:PepcoHoldingsLLC█▁▄█▂▅█▂▆▃▇▂▄1368.01016.01171.01380.01091.01228.01361.01076.01251.01121.01310.01074.01175.0NANANANANANANANANANANANANANA
 EBT Margin dei:LegalEntity exc:PotomacElectricPowerCompany▇▁▃█▃▅▇▂▄▂▆▂▃▁█▂611.0494.0544.0642.0531.0575.0628.0523.0557.0510.0604.0514.0530.0491.0635.0509.0NANANANANANANANANANANA
 EBT Margin dei:LegalEntity,us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments exc:PepcoHoldingsLLC,us-gaap:CorporateNonSegment,us-gaap:CorporateAndOther▁▃▂▁▃▆▅▆█91.097.093.092.097.0106.0103.0108.0113.0NANANANANANANANANANANANANANANANANANA
 EBT Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,exc:AtlanticCityElectricCompany█▁▂█▂▂▇▁▃420.0256.0276.0419.0274.0273.0406.0265.0310.0NANANANANANANANANANANANANANANANANANA
 EBT Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,exc:BaltimoreGasAndElectricCompany▃▁▇▃▂█▃▂█731.0616.0937.0703.0649.0976.0731.0662.0977.0NANANANANANANANANANANANANANANANANANA
 EBT Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,exc:CommonwealthEdisonCo█▃▃▇▁▂▇▂▅1643.01417.01439.01583.01351.01408.01598.01398.01512.0NANANANANANANANANANANANANANANANANANA
 EBT Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,exc:DelmarvaPowerandLightCompany▅▁▆▄▂█▅▂█337.0267.0350.0319.0287.0380.0328.0289.0384.0NANANANANANANANANANANANANANANANANANA
 EBT Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,exc:ExelonGenerationCoLLC▄▁▅▅▂▇▇▄█4659.03880.04733.04774.04210.05296.05278.04579.05512.0NANANANANANANANANANANANANANANANANANA
 EBT Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,exc:PecoEnergyCo▆▂▆▅▁█▄▁▇813.0681.0813.0778.0655.0900.0757.0653.0866.0NANANANANANANANANANANANANANANANANANA
 EBT Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,exc:PepcoHoldingsLLC█▁▄█▂▅█▂▆1368.01016.01171.01380.01091.01228.01361.01076.01251.0NANANANANANANANANANANANANANANANANANA
 EBT Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,exc:PotomacElectricPowerCompany▇▁▃█▃▅▇▂▄611.0494.0544.0642.0531.0575.0628.0523.0557.0NANANANANANANANANANANANANANANANANANA
 Operating Margin dei:LegalEntity exc:AtlanticCityElectricCompany█▁▂█▂▂▇▁▃▂▆▂▂▂█▂▂▇▂▄420.0256.0276.0419.0274.0273.0406.0265.0310.0271.0370.0270.0275.0275.0421.0270.0291.0386.0285.0334.0NANANANANANANA
 Operating Margin dei:LegalEntity exc:BaltimoreGasAndElectricCompany▃▁▆▂▂▇▃▂▇▄▃▂▆▄▄▂▃▃▁█▃▂▂█▄▃▂731.0616.0937.0703.0649.0976.0731.0662.0977.0813.0738.0674.0951.0812.0812.0680.0746.0725.0628.01036.0761.0697.0653.01054.0794.0737.0653.0
 Operating Margin dei:LegalEntity exc:CommonwealthEdisonCo█▅▆▇▄▅▇▅▆▄▇▅▄▃▆▄▃▅▂▂▁▃▂▂▁▂▁1643.01417.01439.01583.01351.01408.01598.01398.01512.01309.01571.01357.01298.01223.01497.01286.01196.01376.01148.01185.01079.01222.01128.01134.01068.01156.01080.0
 Operating Margin dei:LegalEntity exc:DelmarvaPowerandLightCompany▄▁▅▃▂▆▄▂▆▄▄▂▅▃▄▂▂▃▁█337.0267.0350.0319.0287.0380.0328.0289.0384.0330.0327.0282.0362.0303.0331.0281.0296.0314.0271.0421.0NANANANANANANA
 Operating Margin dei:LegalEntity exc:ExelonGenerationCoLLC▄▂▅▅▃▆▆▄▇▄▅▃▅▃▅▁▃▅▃█▅▄▂▃▂▃▂4659.03880.04733.04774.04210.05296.05278.04579.05512.04654.04751.04174.04888.04388.05035.03589.04294.04768.04232.05840.04802.04412.03789.04390.03772.04255.04070.0
 Operating Margin dei:LegalEntity exc:PecoEnergyCo▅▂▅▄▁▆▃▁▆▃▃▁▄▂▄▂▁▃▂█▃▂▂█▄▃▂813.0681.0813.0778.0655.0900.0757.0653.0866.0729.0715.0630.0796.0701.0788.0664.0645.0740.0661.0985.0750.0693.0656.0993.0805.0728.0672.0
 Operating Margin dei:LegalEntity exc:PepcoHoldingsLLC█▁▄█▂▅█▂▆▃▇▂▄1368.01016.01171.01380.01091.01228.01361.01076.01251.01121.01310.01074.01175.0NANANANANANANANANANANANANANA
 Operating Margin dei:LegalEntity exc:PotomacElectricPowerCompany▇▁▄█▃▅▇▃▄▂▆▂▃▁█▂▁▆▂▄611.0494.0544.0642.0531.0575.0628.0523.0557.0510.0604.0514.0530.0491.0635.0509.0488.0592.0504.0545.0NANANANANANANA
  2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
 TTM Greenblatt ROC _ _▄▃▇▇▅▇▆▅▆▇█▁▇▄▇▄▄▇▆▇▄█▅▁▅▇▅769.0565.01220.01353.0841.01218.01146.0942.01101.01258.01475.0232.01296.0714.01267.0647.0707.01200.01134.01366.0705.01400.0829.0163.0889.01254.01005.0
  2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
us-gaap:ComprehensiveIncomeNetOfTax ▄▄▄▅▄▅▅▄▅█▅▃▅▃▄▄▃▄▅▅▁▆▅▃▆▅▄529.0562.0603.0799.0506.0890.0785.0582.0656.01973.0868.0115.0985.046.0562.0337.0263.0619.0683.0749.0-672.01063.0688.097.01115.0748.0497.0
us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest ██▁▆▆██▆██▇▆▆█▇▇▆▅▆68.053.0-206.0-9.09.058.067.04.052.067.043.0-16.0-16.049.031.039.0-19.0-42.0-5.0NANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest ▃▃▂▃▃▄▄▃▃█▄▁▄▁▃▂▂▃▃597.0615.0397.0790.0515.0948.0852.0586.0708.02040.0911.099.0969.0137.0531.0298.0263.0661.0688.0NANANANANANANANA
us-gaap:CostOfGoodsAndServicesSoldDepreciationAndAmortization █▁▁▃▃▃▄▃1289.01001.01021.01083.01079.01075.01105.01088.0NANANANANANANANANANANANANANANANANANANA
us-gaap:CostsAndExpenses ▇▄▆▆▄▇▇▅█▅▅▆▆▅▆▃▃▃▂▆▅▂▂▅▁▁▁8087.06769.07529.07559.06881.08262.08252.07138.08648.07334.07300.07392.07691.07072.07736.06294.06001.06203.05387.07465.07016.05513.05456.07055.05277.05285.05115.0
us-gaap:GainLossOnInvestments ▇█▁▆▆▇▆▅▅▆▆▆▆▅▆▅▆▄▅▅▆▅▆▅▆▆▅255.0455.0-651.063.096.0308.0101.0-12.0-68.0187.0145.0109.0175.0-14.0129.059.090.0-223.0-45.047.069.0-27.0142.026.075.068.0-39.0
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest ▅▅▁▇▄█▆▄▅▇█▁▇▃▆▃786.0794.085.01102.0644.01282.0947.0613.0702.01225.01326.01.01206.0392.0871.0415.0NANANANANANANANANANANA
us-gaap:IncomeTaxExpenseBenefit ▇▇▄▆▆▇▆▆▆▁█▅▇▆▇▆▇▆▇▇▅█▇▅▇█▇216.0219.0-294.0172.0144.0310.0137.066.059.0-720.0452.0-72.0215.0136.0340.0102.0268.0115.0327.0363.020.0422.0277.0-54.0311.0439.0239.0
us-gaap:InterestExpense ▆▆▆▆▆▆▆▅▅▅▅▆▅▅█▅▃▃▁▅▅▃▃▂▃▃▃398.0421.0404.0403.0403.0397.0387.0367.0365.0359.0377.0426.0363.0347.0506.0366.0268.0243.0145.0335.0333.0247.0228.0217.0224.0228.0246.0
 us-gaap:NetIncomeLoss dei:LegalEntity exc:ExelonGenerationCoLLC▂▃▂▂▂▃▂▂▂█▃▁▃▂▂▂49.0476.045.0257.0108.0363.0234.0178.0136.02224.0305.0-250.0423.0-42.0236.0-8.0NANANANANANANANANANANA
us-gaap:NetIncomeLossAttributableToNoncontrollingInterest ██▁▆▇██▆█68.053.0-206.0-12.010.059.067.03.051.0NA42.0-1.0NANANANANANANANANANANANANANANA
us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic ▃▃▃▄▃▄▄▃▃█▄▁▅▂▃▂▂▃▃▄▁▅▃▁▃▄▃501.0521.0582.0772.0484.0907.0733.0539.0585.01871.0824.080.0995.0204.0490.0267.0309.0629.0638.0693.019.0993.0522.090.0495.0738.0490.0
us-gaap:NonoperatingIncomeExpense ▇█▁▆▆▇▆▅▅▇▆▆▆▅▅▆▆▄▆▅▄▇▇▆▆▆▅17.0229.0-1135.0-251.0-197.064.0-199.0-329.0-399.0-35.0-149.0-231.0-90.0-321.0-396.0-232.0-145.0-497.0-172.0-265.0-590.096.05.0-124.0-84.0-79.0-269.0
us-gaap:OperatingExpenses ▆▁▄▄▁▇▇▂█8087.06769.07529.07559.06881.08262.08252.07138.08648.0NANANANANANANANANANANANANANANANANANA
us-gaap:OperatingIncomeLoss ▄▃▇▇▅▇▆▅▆▇█▁▇▄▇▄▄▇▆▇▄█▅▁▅▇▅769.0565.01220.01353.0841.01218.01146.0942.01101.01258.01475.0232.01296.0714.01267.0647.0707.01200.01134.01366.0705.01400.0829.0163.0889.01254.01005.0
us-gaap:OtherComprehensiveIncomeLossNetOfTax ▅▅▅▅▅▅▅▅▅▅▅▅▅▄▅▅▅▅▅▅▁▅▆▅█▅▅28.041.021.030.021.0-18.052.044.072.0102.044.035.0-12.0-132.036.031.0-28.032.050.011.0-767.0-11.0131.04.0621.012.00.0
us-gaap:OtherNonoperatingIncomeExpense ▇█▁▅▆▇▆▅▅▆▆▆▆▅▅▅▅▃▅▅▃▆▆▅▅▅▅421.0656.0-725.0158.0212.0467.0194.044.0-28.0331.0237.0205.0283.036.0120.0144.0133.0-244.0-17.080.0-247.0354.0243.0103.0162.0155.0-17.0
us-gaap:ProfitLoss ▃▃▂▄▃▄▄▃▃█▄▁▅▂▃▂▂▃▃▄▁▅▃▁▃▄▃569.0574.0376.0760.0494.0966.0800.0542.0636.01938.0867.064.0981.0248.0526.0306.0309.0587.0633.0738.018.01074.0557.093.0495.0736.0497.0
us-gaap:RegulatedOperatingRevenue ▁▁▁▁▁██▇█▇█▇▇▇█▇▅▅▅▆-11.0-122.067.0-80.0-13.04503.04457.03797.04570.03946.04313.03715.04197.03793.04467.03676.02584.02837.02434.03198.0NANANANANANANA
 us-gaap:RegulatedOperatingRevenue dei:LegalEntity exc:AtlanticCityElectricCompany█▁▇▇▆▇▇▇5.0-26.01.01.0-2.01.0-1.0-1.0NA0.00.00.00.0NANANANANANANANANANANANANANA
 us-gaap:RegulatedOperatingRevenue dei:LegalEntity exc:BaltimoreGasAndElectricCompany▄▁█▄▅▆▄▄-9.0-37.036.0-5.06.010.0-6.0-4.0NA0.00.00.00.0NANANANANANANANANANANANANANA
 us-gaap:RegulatedOperatingRevenue dei:LegalEntity exc:CommonwealthEdisonCo▃▄█▁▅▄▅▅-38.0-25.012.0-56.0-14.0-28.0-15.0-17.0NA0.00.00.00.0NANANANANANANANANANANANANANA
 us-gaap:RegulatedOperatingRevenue dei:LegalEntity exc:DelmarvaPowerandLightCompany█▁▇▅▆▆▆▇8.0-25.01.0-6.00.00.00.04.0NA0.00.00.00.0NANANANANANANANANANANANANANA
 us-gaap:RegulatedOperatingRevenue dei:LegalEntity exc:PecoEnergyCo██▇▁▄▄▆▇5.04.02.0-11.0-3.0-3.01.02.0NA0.00.00.00.0NANANANANANANANANANANANANANA
 us-gaap:RegulatedOperatingRevenue dei:LegalEntity exc:PepcoHoldingsLLC█▁▇▅▅▇▅▅31.0-64.018.0-9.0-3.015.0-5.0-7.0NA33.00.00.00.0NANANANANANANANANANANANANANA
 us-gaap:RegulatedOperatingRevenue dei:LegalEntity exc:PotomacElectricPowerCompany█▁▇▃▄▇▃▂18.0-13.015.0-3.0-1.014.0-4.0-10.0NA0.00.00.00.0NANANANANANANANANANANANANANA
us-gaap:Revenues ▆▃▆▇▄█▇▅█▅▆▄▆▅▇▃▂▄▂▆▃▃▁▃▁▂▁8853.07322.08747.08929.07689.09477.09403.08076.09693.08381.08769.07623.08757.07875.09002.06910.06702.07401.06514.08830.07255.06912.06024.07237.06163.06502.06141.0
  2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
  2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
us-gaap:Assets ███▇▇▇▇▇▆▆▇▆▆▆▆▆▃▃▃▂▂▂▂▁▁▁▁127767.0126313.0124677.0122738.0121596.0121593.0119485.0117249.0117018.0116700.0118473.0117104.0117068.0114904.0114535.0112778.095384.095128.092213.087391.086814.085264.083656.079468.079924.079661.078420.0
us-gaap:Liabilities ██▇▇▇▇▇▆▆▆▇▇▇▇▇▇▃▃▃▂▂▂▂▁▁▁▁92664.091442.090061.088386.087689.087889.086097.084410.084453.084568.088156.087814.088777.087292.087049.085456.068062.067839.067144.062753.062681.060214.059427.056690.056984.057594.056832.0
us-gaap:LiabilitiesAndStockholdersEquity ███▇▇▇▇▆▆▆▇▆▆▆▆▆▃▃▃▂▂▂▂▁▁127767.0126313.0124677.0122738.0121596.0121593.0119485.0117249.0117018.0116700.0118473.0117104.0117068.0114904.0114535.0112778.095384.095128.092213.087391.086814.085264.083656.079468.079924.0NANA
us-gaap:StockholdersEquity ███▇▇▇▇▇▆▆▅▅▄▄▄▄▄▄▂▂▂▂▂▂▂▁▁32884.032703.032482.032023.031548.031357.031020.030515.030231.029857.028100.027546.026530.025837.026027.025756.025793.025770.023506.023065.022608.023595.022853.022568.022732.021859.021353.0
  2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
us-gaap:AssetsCurrent ▄▄▄▄▃▄▅▃▃▃▄▄▄▄▄▃▇█▇▃▄▃▁▁▂▂▁12312.012533.012476.012206.011655.012476.013473.011489.011533.011834.012724.012232.012194.012412.012208.011495.015334.016867.015425.011357.012097.011837.09823.09675.010137.09951.09409.0
 us-gaap:Cash dei:LegalEntity,us-gaap:AssetsSoldUnderAgreementsToRepurchaseMaturityPeriods,us-gaap:BalanceSheetLocation exc:ExelonGenerationCoLLC,us-gaap:MaturityUpTo30Days,exc:NuclearDecommissioningTrustFundInvestments█▅▁▂121.0101.078.085.0NANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Cash dei:LegalEntity,us-gaap:AssetsSoldUnderAgreementsToRepurchaseMaturityPeriods,us-gaap:FairValueByAssetClass,us-gaap:FairValueByMeasurementFrequency exc:ExelonGenerationCoLLC,us-gaap:MaturityUpTo30Days,exc:NuclearDecommissioningTrustFundInvestments,us-gaap:FairValueMeasurementsRecurringNANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Cash us-gaap:AssetsSoldUnderAgreementsToRepurchaseMaturityPeriods,us-gaap:BalanceSheetLocation us-gaap:MaturityUpTo30Days,exc:NuclearDecommissioningTrustFundInvestments█▅▁▂121.0101.078.085.0NANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Cash us-gaap:AssetsSoldUnderAgreementsToRepurchaseMaturityPeriods,us-gaap:FairValueByAssetClass,us-gaap:FairValueByMeasurementFrequency us-gaap:MaturityUpTo30Days,exc:NuclearDecommissioningTrustFundInvestments,us-gaap:FairValueMeasurementsRecurringNANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▂▃▂▂▁▁▂▁▁▁▂▁▁▁▂▂▇█▇▂▂▃▂▁▂▂▁1858.02129.01457.01683.0735.0880.01918.0694.0787.0898.01203.0536.0609.0635.01897.01647.06502.07265.06014.01825.01878.02763.01362.0914.01609.01644.0991.0
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents ▇█▅▆▂▃▇▂▂▂▄▁▁▁▁2480.02680.01992.02178.01178.01314.02321.01028.01099.01190.01545.0811.0889.0914.0889.0NA914.0NANANANANANANANANANA
us-gaap:AccountsReceivableNetCurrent ▂▂▆▇▆█▇▆▇▇▅▅▆▇▆▅▃▃▃▅▄▂▂▂▁▁▁2792.02814.04042.04188.04125.04564.04239.04094.04190.04401.03854.03825.03886.04158.04061.03671.03187.03215.03227.03702.03482.02815.02973.02997.02721.02584.02609.0
 us-gaap:InventoryNet dei:LegalEntity exc:AtlanticCityElectricCompany▆▅▅█▆▅▄▁▃▃34.032.032.037.034.032.031.025.029.029.0NANANA22.0NANA23.0NANANANANANANANANANA
 us-gaap:InventoryNet dei:LegalEntity exc:CommonwealthEdisonCo▇█▇█▆▆▆▆▆▆▆▇▇▇▇▇█▆▆▅▄▃▂▂▂▁▁160.0166.0161.0162.0151.0152.0146.0146.0146.0152.0152.0160.0154.0159.0156.0155.0164.0148.0144.0135.0125.0121.0112.0107.0109.0103.0102.0
 us-gaap:InventoryNet dei:LegalEntity exc:PotomacElectricPowerCompany▆▆▆█▇▆▁▂▃▂110.0109.0109.0118.0115.0109.081.085.089.087.0NANANA63.0NANA67.0NANANANANANANANANANA
us-gaap:OtherAssetsCurrent █▇▅▄▃▄▃▄▅▄▄▅▃▂▃▃▁▃▁▂▂▃▂▂▁▁▁2277.02139.01629.01296.01218.01406.01177.01360.01495.01242.01435.01600.01221.0930.01064.01101.0748.01178.0654.0793.0865.01022.0775.0901.0666.0699.0690.0
  2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
 us-gaap:AssetsNoncurrent dei:LegalEntity,us-gaap:ConsolidatedEntities exc:AtlanticCityElectricCompany,us-gaap:VariableInterestEntityPrimaryBeneficiaryNANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:AssetsNoncurrent dei:LegalEntity,us-gaap:ConsolidatedEntities exc:ExelonGenerationCoLLC,us-gaap:VariableInterestEntityPrimaryBeneficiaryNANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:AssetsNoncurrent dei:LegalEntity,us-gaap:ConsolidatedEntities exc:PepcoHoldingsLLC,us-gaap:VariableInterestEntityPrimaryBeneficiaryNANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:AssetsNoncurrent dei:LegalEntity,us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities exc:AtlanticCityElectricCompany,us-gaap:VariableInterestEntityPrimaryBeneficiary▁█10.011.0NANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:AssetsNoncurrent dei:LegalEntity,us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities exc:ExelonGenerationCoLLC,us-gaap:VariableInterestEntityPrimaryBeneficiary█▁8941.08869.0NANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:AssetsNoncurrent dei:LegalEntity,us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities exc:PepcoHoldingsLLC,us-gaap:VariableInterestEntityPrimaryBeneficiary▁█11.014.0NANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:AssetsNoncurrent us-gaap:ConsolidatedEntities us-gaap:VariableInterestEntityPrimaryBeneficiaryNANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:AssetsNoncurrent us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities us-gaap:VariableInterestEntityPrimaryBeneficiary█▁8952.08883.0NANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PropertyPlantAndEquipmentGross NANANANANANANANANA95266.0NANANA90724.0NANA73814.0NANANA66829.0NANANA61043.0NANA
 us-gaap:PropertyPlantAndEquipmentGross dei:LegalEntity exc:AtlanticCityElectricCompanyNANANANANANANANANA3772.0NANANA3537.0NANA3291.0NANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross dei:LegalEntity exc:BaltimoreGasAndElectricCompanyNANANANANANANANANA11007.0NANANA10294.0NANA9613.0NANANA9072.0NANANA8566.0NANA
 us-gaap:PropertyPlantAndEquipmentGross dei:LegalEntity exc:CommonwealthEdisonCoNANANANANANANANANA24992.0NANANA23272.0NANA21212.0NANANA19225.0NANANA17850.0NANA
 us-gaap:PropertyPlantAndEquipmentGross dei:LegalEntity exc:DelmarvaPowerandLightCompanyNANANANANANANANANA4826.0NANANA4448.0NANA4209.0NANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross dei:LegalEntity exc:ExelonGenerationCoLLCNANANANANANANANANA36334.0NANANA36147.0NANA34482.0NANANA30557.0NANANA27145.0NANA
 us-gaap:PropertyPlantAndEquipmentGross dei:LegalEntity exc:PecoEnergyCoNANANANANANANANANA11464.0NANANA10818.0NANA10242.0NANANA9718.0NANANA9319.0NANA
 us-gaap:PropertyPlantAndEquipmentGross dei:LegalEntity exc:PepcoHoldingsLLCNANANANANANANANANA12985.0NANANANANANANANANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross dei:LegalEntity exc:PotomacElectricPowerCompanyNANANANANANANANANA9178.0NANANA8621.0NANA8091.0NANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross dei:LegalEntity,us-gaap:PropertyPlantAndEquipmentByType exc:AtlanticCityElectricCompany,us-gaap:ConstructionInProgressNANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross dei:LegalEntity,us-gaap:PropertyPlantAndEquipmentByType exc:AtlanticCityElectricCompany,us-gaap:ElectricTransmissionAndDistributionNANANANANANANANANA3607.0NANANA3341.0NANA3105.0NANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross dei:LegalEntity,us-gaap:PropertyPlantAndEquipmentByType exc:AtlanticCityElectricCompany,us-gaap:OtherCapitalizedPropertyPlantAndEquipmentNANANANANANANANANA27.0NANANA27.0NANA28.0NANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross dei:LegalEntity,us-gaap:PropertyPlantAndEquipmentByType exc:BaltimoreGasAndElectricCompany,exc:CommonElectricAndGasTAndDEquipmentNANANANANANANANANA771.0NANANA707.0NANA655.0NANANA623.0NANANA578.0NANA
 us-gaap:PropertyPlantAndEquipmentGross dei:LegalEntity,us-gaap:PropertyPlantAndEquipmentByType exc:BaltimoreGasAndElectricCompany,us-gaap:ConstructionInProgressNANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PropertyPlantAndEquipmentGross dei:LegalEntity,us-gaap:PropertyPlantAndEquipmentByType exc:BaltimoreGasAndElectricCompany,us-gaap:ElectricTransmissionAndDistributionNANANANANANANANANA7464.0NANANA7067.0NANA6663.0NANANA6339.0NANANA6100.0NANA
 us-gaap:PropertyPlantAndEquipmentGross dei:LegalEntity,us-gaap:PropertyPlantAndEquipmentByType exc:BaltimoreGasAndElectricCompany,us-gaap:GasDistributionEquipmentNANANANANANANANANA2379.0NANANA2170.0NANA1951.0NANANA1761.0NANANA1660.0NANA
 us-gaap:PropertyPlantAndEquipmentGross dei:LegalEntity,us-gaap:PropertyPlantAndEquipmentByType exc:BaltimoreGasAndElectricCompany,us-gaap:OtherCapitalizedPropertyPlantAndEquipmentNANANANANANANANANA26.0NANANA32.0NANA32.0NANANA32.0NANANA32.0NANA
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 us-gaap:ConstructionInProgressGross us-gaap:PublicUtility,us-gaap:RestructuringCostAndReserve exc:Lasalle,us-gaap:FacilityClosing█▁23.019.0NANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment ██▇▇▇▇▇▆▆▆▅▅▅▄▄▃▃▃▂▂▂▂▂▂▁▁▁25582.024798.024449.023590.024266.023695.023122.022302.021905.021064.020591.019735.019716.019169.018354.017340.016375.016185.015553.015207.014742.014932.014369.014066.013713.013366.012905.0
us-gaap:AmortizationOfIntangibleAssets ▂▂▂▂▂▂▂▂▂█▂▂▂█▁▂▆▂▁▁16.015.016.015.014.015.015.015.013.049.015.014.014.049.010.014.037.015.012.012.0NANANANANANANA
us-gaap:PropertyPlantAndEquipmentNet ███▇▇▇▇▇▆▆▆▆▆▆▆▆▃▃▃▂▂▂▂▁▁▁▁82561.081748.081017.078593.078030.077460.075840.075284.074711.074202.073067.072748.072630.071555.071214.070693.057439.055814.053935.053001.052087.051630.051747.047742.047330.046495.045994.0
us-gaap:LongTermInvestments ▁▁▁▁▃▃▃▃▃▃▃▃▃▃▃▂▃▃▃▂▂▂▅▅███444.0424.0418.0471.0618.0620.0649.0636.0640.0640.0634.0638.0648.0629.0592.0502.0639.0620.0607.0568.0544.0562.0839.0825.01165.01154.01171.0
 us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures us-gaap:ConsolidatedEntities srt:ParentCompanyNANANANANANANANANANANANANANANANANANANANANANANANANANANA
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 us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures us-gaap:ConsolidatedEntities,us-gaap:RelatedPartyTransactionsByRelatedParty srt:ParentCompany,exc:ExelonEnterpriseNANANANANANANANANANANANANANANANANANANANANANANANANANANA
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 us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures us-gaap:ConsolidatedEntities,us-gaap:RelatedPartyTransactionsByRelatedParty srt:ParentCompany,exc:PotomacCapitalInvestmentAffiliateNANANANANANANANANANANANANANANANANANANANANANANANANANANA
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us-gaap:Goodwill ████████████████▁▁▁▁▁▁▁▁▁▁▁6677.06677.06677.06677.06677.06677.06677.06677.06677.06677.06677.06677.06677.06677.06672.06696.02672.02672.02672.02672.02672.02672.02674.02625.02625.02625.02625.0
us-gaap:FiniteLivedIntangibleAssetsNet NANANANANANANANANA-27.0NANANA-279.0NANA755.0NANANA738.0NANANA417.0NANA
 us-gaap:FiniteLivedIntangibleAssetsNet dei:LegalEntity,us-gaap:FiniteLivedIntangibleAssetsByMajorClass exc:BusinessServicesCompany,us-gaap:LicensingAgreementsNANANANANANANANANANANANANANANANANANANANANANANANANANANA
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 us-gaap:OperatingLeaseRightOfUseAsset dei:LegalEntity,us-gaap:BalanceSheetLocation exc:AtlanticCityElectricCompany,us-gaap:OtherNoncurrentAssetsNANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingLeaseRightOfUseAsset dei:LegalEntity,us-gaap:BalanceSheetLocation exc:BaltimoreGasAndElectricCompany,us-gaap:OtherNoncurrentAssetsNANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingLeaseRightOfUseAsset dei:LegalEntity,us-gaap:BalanceSheetLocation exc:CommonwealthEdisonCo,us-gaap:OtherNoncurrentAssetsNANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingLeaseRightOfUseAsset dei:LegalEntity,us-gaap:BalanceSheetLocation exc:DelmarvaPowerandLightCompany,us-gaap:OtherNoncurrentAssetsNANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingLeaseRightOfUseAsset dei:LegalEntity,us-gaap:BalanceSheetLocation exc:ExelonGenerationCoLLC,us-gaap:OtherNoncurrentAssetsNANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingLeaseRightOfUseAsset dei:LegalEntity,us-gaap:BalanceSheetLocation exc:PecoEnergyCo,us-gaap:OtherNoncurrentAssetsNANANANANANANANANANANANANANANANANANANANANANANANANANANA
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 us-gaap:OperatingLeaseRightOfUseAsset dei:LegalEntity,us-gaap:BalanceSheetLocation exc:PotomacElectricPowerCompany,us-gaap:OtherNoncurrentAssetsNANANANANANANANANANANANANANANANANANANANANANANANANANANA
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us-gaap:OtherAssetsNoncurrent ██████▃▂▂▂▂▂▃▃▃▂▃▃▂▂▂▂▁▁▁▂▂3165.03101.03164.03123.03038.03017.01560.01194.01333.01322.01277.01265.01440.01472.01474.01366.01445.01499.01388.01234.01160.01139.01092.0934.0964.01121.01175.0
  2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
us-gaap:AccountsPayableCurrent ▆▅▅▇▆▇▇▆▆█▆▆▅█▅▄▅▅▄▄▅▃▃▂▂▂▁3182.03047.02883.03348.03248.03327.03348.03113.03207.03532.03132.03134.03011.03441.03044.02826.02883.02987.02727.02839.03048.02502.02633.02475.02314.02369.02210.0
us-gaap:AccruedLiabilitiesCurrent ▃▂▂▃▂▃▃▂▂▃▇▆▇█▇▆▅▂▁▁▂▂▁▁▂▂▁1879.01616.01535.01877.01706.01725.01964.01665.01569.01835.03080.02878.03007.03460.03236.02757.02376.01576.01366.01230.01539.01462.01382.01364.01633.01540.01382.0
us-gaap:ContractWithCustomerLiabilityCurrent █▁▁▁▁▁▂▁149.020.029.026.021.025.037.028.0NA35.0NANANANANANANANANANANANANANANANANA
us-gaap:LiabilitiesCurrent ▅▅▆▇▇▆▄▄▄▅▆██▇▆▆▃▂▁▂▃▃▃▂▂▂▃11262.011065.011774.013085.012934.012229.010140.09626.010153.010796.012395.013965.014437.013457.012158.011894.09118.07847.06526.07374.08762.08431.08567.07351.07728.07507.08374.0
us-gaap:LongTermDebtCurrent NANANANANANANANANA2088.0NANANA2430.0NANA1500.0NANANA1802.0NANANA1509.0NANA
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 us-gaap:LongTermDebtCurrent dei:LegalEntity exc:ExelonGenerationCoLLCNANANANANANANANANA346.0NANANA1117.0NANA90.0NANANA614.0NANANA561.0NANA
 us-gaap:LongTermDebtCurrent dei:LegalEntity exc:PecoEnergyCoNANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherLiabilitiesCurrent ██▆▇▇▆▂▃▂▃▂▃▂▃▄▃▁▃▂▃▄▃▃▂▁▁▁1475.01474.01276.01425.01367.01245.0935.0973.0956.0982.0933.0977.0942.0981.01068.01025.0842.01017.0941.01018.01123.0985.0994.0932.0858.0838.0823.0
us-gaap:TaxesPayableCurrent ▂▁▇▆█403.0396.0442.0431.0446.0NANANANA373.0NANANA723.0NANA293.0150.0360.065.0305.0NANA285.0315.0NANA
  2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
 us-gaap:LiabilitiesNoncurrent dei:LegalEntity,us-gaap:ConsolidatedEntities exc:ExelonGenerationCoLLC,us-gaap:VariableInterestEntityPrimaryBeneficiaryNANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LiabilitiesNoncurrent dei:LegalEntity,us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities exc:AtlanticCityElectricCompany,us-gaap:VariableInterestEntityPrimaryBeneficiary▁█6.011.0NANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LiabilitiesNoncurrent dei:LegalEntity,us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities exc:ExelonGenerationCoLLC,us-gaap:VariableInterestEntityPrimaryBeneficiary█▁3223.03197.0NANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LiabilitiesNoncurrent dei:LegalEntity,us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities exc:PepcoHoldingsLLC,us-gaap:VariableInterestEntityPrimaryBeneficiary▁█7.013.0NANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LiabilitiesNoncurrent us-gaap:ConsolidatedEntities us-gaap:VariableInterestEntityPrimaryBeneficiaryNANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LiabilitiesNoncurrent us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities us-gaap:VariableInterestEntityPrimaryBeneficiary█▁3230.03210.0NANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LongTermDebt NANANANANANANANANA34047.0NANANA33959.0NANA25761.0NANANA21404.0131.0131.0NA19408.0NANA
 us-gaap:LongTermDebt dei:LegalEntity exc:AtlanticCityElectricCompanyNANANANANANANANANA1127.0NANANA1162.0NANANANANANANANANANANANANA
 us-gaap:LongTermDebt dei:LegalEntity exc:BaltimoreGasAndElectricCompanyNANANANANANANANANA2600.0NANANA2599.0NANA2128.0NANANA2203.0NANANA2273.0NANA
 us-gaap:LongTermDebt dei:LegalEntity exc:CommonwealthEdisonCoNANANANANANANANANA7882.0NANANA7307.0NANA6773.0NANANA6183.0NANANA5900.0NANA
 us-gaap:LongTermDebt dei:LegalEntity exc:DelmarvaPowerandLightCompanyNANANANANANANANANA1309.0NANANA1348.0NANANANANANANANANANANANANA
 us-gaap:LongTermDebt dei:LegalEntity exc:ExelonGenerationCoLLCNANANANANANANANANA8955.0NANANA9208.0NANA8919.0NANANA8134.0NA1.0NA7552.0NANA
 us-gaap:LongTermDebt dei:LegalEntity exc:PecoEnergyCoNANANANANANANANANA3109.0NANANA2784.0NANA2784.0NANANA2434.0NANANA2384.0NANA
 us-gaap:LongTermDebt dei:LegalEntity exc:PepcoHoldingsLLCNANANANANANANANANA5189.0NANANA5157.0NANANANANANANANANANANANANA
 us-gaap:LongTermDebt dei:LegalEntity exc:PotomacElectricPowerCompanyNANANANANANANANANA2570.0NANANA2381.0NANANANANANANANANANANANANA
 us-gaap:LongTermDebt dei:LegalEntity,us-gaap:DebtInstrument,us-gaap:LongtermDebtType exc:ExelonGenerationCoLLC,exc:ExGenRenewablesIVDec2020,exc:NonRecourseDebtNANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LongTermDebt us-gaap:ConsolidatedEntities srt:ParentCompanyNANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LongTermDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType exc:ExGenRenewablesIVDec2020,exc:NonRecourseDebtNANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LongTermDebtNoncurrent ███▇▇▇▇▇▇▇▆▆▆▆▇▆▄▄▄▃▂▂▂▂▁▂▁35512.036112.034808.032056.031909.032960.034519.033179.032905.032176.031701.030315.031044.031575.032330.031541.023645.024541.025220.020519.019362.019200.018133.018247.017325.017583.016121.0
 us-gaap:DeferredTaxLiabilitiesNoncurrent us-gaap:ConsolidatedEntities srt:ParentCompanyNANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap:RetirementPlanType us-gaap:PensionPlansDefinedBenefitNANANANANANANANANA3736.0NANANA4248.0NANANANANANANANANANANANANA
us-gaap:MinorityInterest █▇▇████████▆▆▆▅▅▅▅▅▅▅▅▄▁▁▁▁2219.02168.02134.02329.02359.02347.02368.02324.02334.02275.02217.01744.01761.01775.01433.01349.01308.01326.01370.01380.01332.01262.01183.017.015.015.042.0
us-gaap:OtherLiabilitiesNoncurrent █▇▇▇▇▇▄▃▃▃▃▂▂▂▃▂▁▄▅▄▄▃▃▃▅▅▅3313.02964.03017.03123.03053.03158.02160.02087.02067.02097.01899.01828.01853.01827.01928.01876.01491.02231.02528.02166.02147.02104.02133.02093.02540.02514.02635.0
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo NANANA246.0246.0244.0NANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo dei:LegalEntity exc:AtlanticCityElectricCompanyNANANA5.05.05.0NANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo dei:LegalEntity exc:BaltimoreGasAndElectricCompanyNANANA31.031.032.0NANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo dei:LegalEntity exc:CommonwealthEdisonCoNANANA3.03.02.0NANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo dei:LegalEntity exc:DelmarvaPowerandLightCompanyNANANA12.012.011.0NANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo dei:LegalEntity exc:ExelonGenerationCoLLCNANANA162.0161.0162.0NANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo dei:LegalEntity exc:PepcoHoldingsLLCNANANA43.042.042.0NANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo dei:LegalEntity exc:PotomacElectricPowerCompanyNANANA9.09.09.0NANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree NANANA179.0177.0174.0NANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree dei:LegalEntity exc:AtlanticCityElectricCompanyNANANA4.04.04.0NANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree dei:LegalEntity exc:CommonwealthEdisonCoNANANA2.02.01.0NANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree dei:LegalEntity exc:DelmarvaPowerandLightCompanyNANANA12.011.011.0NANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree dei:LegalEntity exc:ExelonGenerationCoLLCNANANA113.0112.0112.0NANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree dei:LegalEntity exc:PepcoHoldingsLLCNANANA42.041.040.0NANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree dei:LegalEntity exc:PotomacElectricPowerCompanyNANANA9.08.08.0NANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour NANANA148.0141.0139.0NANANANANANANANANANANANANANANANANANANANANA
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 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour dei:LegalEntity exc:ExelonGenerationCoLLCNANANA100.099.099.0NANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour dei:LegalEntity exc:PepcoHoldingsLLCNANANA41.039.039.0NANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour dei:LegalEntity exc:PotomacElectricPowerCompanyNANANA8.08.08.0NANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive NANANA1123.01051.01052.0NANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive dei:LegalEntity exc:BaltimoreGasAndElectricCompanyNANANA19.019.018.0NANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive dei:LegalEntity exc:DelmarvaPowerandLightCompanyNANANA53.052.052.0NANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive dei:LegalEntity exc:ExelonGenerationCoLLCNANANA837.0834.0840.0NANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive dei:LegalEntity exc:PepcoHoldingsLLCNANANA197.0196.0194.0NANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive dei:LegalEntity exc:PotomacElectricPowerCompanyNANANA43.043.042.0NANANANANANANANANANANANANANANANANANANANANA
  2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
us-gaap:StockholdersEquity ███▇▇▇▇▇▆▆▅▅▄▄▄▄▄▄▂▂▂▂▂▂▂▁▁32884.032703.032482.032023.031548.031357.031020.030515.030231.029857.028100.027546.026530.025837.026027.025756.025793.025770.023506.023065.022608.023595.022853.022568.022732.021859.021353.0
us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest ████▇▇▇▇▇▆▆▅▄▄▄▄▄▄▃▃▂▃▂▂▂▁▁35103.034871.034616.034352.033907.033704.033388.032839.032565.032132.030317.029290.028291.027612.027460.027298.027294.027289.025069.024638.024133.025050.024229.022778.022940.022067.021588.0
us-gaap:CommonStockValue ██████▇▇▇▇▇▇▇▇▆▆▆▆▁▁▁▁▁▁▁▁▁19362.019336.019303.019238.019209.019171.019063.019008.018973.018964.018862.018860.018807.018794.018756.018722.018676.018647.016755.016731.016709.016679.016651.016751.016741.016716.016693.0
 us-gaap:AdditionalPaidInCapital dei:LegalEntity exc:CommonwealthEdisonCo█▇▇▇▇▆▆▆▅▅▅▄▄▃▃▂▂▂▂▂▂▁▁▁▁▁▁8060.07821.07697.07509.07446.07385.07209.07047.06935.06822.06738.06357.06250.06150.06022.05795.05677.05548.05516.05484.05468.05362.05304.05230.05190.05189.05188.0
us-gaap:RetainedEarningsAccumulatedDeficit ███▇▇▇▆▆▆▅▃▃▄▃▃▃▃▃▃▃▂▂▂▂▂▁▁16749.016622.016475.015871.015452.015321.014949.014551.014346.013503.011950.011442.012720.012030.012121.011926.012068.012046.011704.011334.010910.011160.010435.010180.010358.010131.09660.0
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▁▁▁▂▂▂▃▂▂▅▄▄▄▄▅▄▄▄▄▄▄██▇▇▄▄-3104.0-3132.0-3173.0-2963.0-2990.0-3012.0-2869.0-2921.0-2965.0-2487.0-2589.0-2633.0-2670.0-2660.0-2523.0-2565.0-2624.0-2596.0-2626.0-2673.0-2684.0-1917.0-1906.0-2036.0-2040.0-2661.0-2673.0
 us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax dei:LegalEntity exc:ExelonGenerationCoLLC▂▂▁▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▂▃▃▆▇▇█-36.0-39.0-41.0-36.0-36.0-36.0-31.0-33.0-34.0-37.0-36.0-40.0-41.0-54.0-56.0-65.0-63.0-60.0-47.0-53.0-36.011.037.0193.0214.0243.0275.0
 us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap:ConsolidatedEntities srt:ParentCompanyNANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:TreasuryStockValue ▁▁▁▁▁▁▁▁▁▁▁▁███████████████123.0123.0123.0123.0123.0123.0123.0123.0123.0123.0123.0123.02300.02327.02327.02327.02300.02327.02327.02327.02327.02327.02327.02327.02327.02327.02327.0
us-gaap:MinorityInterest █▇▇████████▆▆▆▅▅▅▅▅▅▅▅▄▁▁▁▁2219.02168.02134.02329.02359.02347.02368.02324.02334.02275.02217.01744.01761.01775.01433.01349.01308.01326.01370.01380.01332.01262.01183.017.015.015.042.0
  2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
us-gaap:NetCashProvidedByUsedInOperatingActivities ▄▄▃▇▅▃▇▆▄▅▇▅▃▃▇█▅▅▇▄▃▅▄▁▅▆▄1542.01600.01080.02501.01854.01044.02806.02367.01502.01803.02779.01697.01201.01082.02810.03080.01942.01705.02479.01490.0814.01892.01586.0165.01949.02056.01479.0
us-gaap:NetCashProvidedByUsedInInvestingActivities █▇▂▃▄▃▃▂▃▂▃▄▁▁▁▁▂▂▃▃▅▅▅▆▄▄▆-393.0-644.0-2075.0-1756.0-1673.0-1786.0-1763.0-1989.0-1857.0-2124.0-1830.0-1569.0-2411.0-2284.0-2342.0-2329.0-2133.0-2143.0-1795.0-1751.0-1223.0-1189.0-1176.0-1011.0-1424.0-1421.0-1078.0
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity exc:AtlanticCityElectricCompany▃▆▄▆▄▁▆▃▇▇▇▅▅▅▇▇▅▆▅█-103.0-78.0-95.0-73.0-99.0-128.0-76.0-108.0-64.0-69.0-68.0-88.0-85.0-82.0-67.0-60.0-90.0-76.0-87.0-53.0NANANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity exc:BaltimoreGasAndElectricCompany▁▂▁▁▂▃▃▄▄▂▄▄▅▁▃▅▅▄▇▇▇▆▇▅▆▆█-286.0-263.0-289.0-300.0-281.0-257.0-231.0-205.0-223.0-263.0-203.0-202.0-181.0-296.0-239.0-184.0-184.0-216.0-143.0-132.0-142.0-148.0-145.0-187.0-162.0-152.0-103.0
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity exc:CommonwealthEdisonCo▇▇▇█▇▇▇▇▇▇▇▇▇▆▇▁▆▇▇▇▇██████-550.0-532.0-501.0-444.0-452.0-492.0-509.0-486.0-523.0-565.0-565.0-637.0-529.0-766.0-606.0-1939.0-716.0-602.0-521.0-523.0-507.0-417.0-401.0-330.0-345.0-349.0-357.0
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity exc:DelmarvaPowerandLightCompany█▁▄▅▅▅▅▄▆▁▄▃▅▅▆▄▄▄▅▇-39.0-143.0-99.0-85.0-81.0-78.0-88.0-100.0-65.0-136.0-102.0-111.0-80.0-82.0-74.0-99.0-105.0-92.0-87.0-61.0NANANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity exc:ExelonGenerationCoLLC██▂▄▃▃▄▂▃▃▃▄▁▃▁▂▁▁▂▂▄▃▃▃▂▂▃1163.0997.0-871.0-291.0-541.0-433.0-257.0-934.0-615.0-689.0-546.0-145.0-1212.0-573.0-1068.0-1006.0-1049.0-1170.0-951.0-899.0-336.0-417.0-420.0-594.0-767.0-771.0-513.0
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity exc:PecoEnergyCo▂▄▂▃▃▃▃▃▃▄▃▃▆▁▄▇▄▄▄▄▃▄▄▃▄█▁-311.0-161.0-280.0-225.0-223.0-220.0-203.0-191.0-215.0-140.0-215.0-215.0-27.0-360.0-147.060.0-163.0-144.0-137.0-144.0-197.0-150.0-120.0-182.0-163.0146.0-343.0
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity exc:PepcoHoldingsLLC▂▆▃▆▄▃▃▃█▁▅▄▅-385.0-309.0-375.0-307.0-339.0-357.0-359.0-369.0-258.0-407.0-320.0-347.0-323.0NANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity exc:PotomacElectricPowerCompany▁█▁▆▄▅▄▅▆▄▅▅▅▃▅▄▆▆▅▆-305.0-29.0-298.0-118.0-192.0-143.0-187.0-158.0-127.0-191.0-146.0-149.0-144.0-212.0-128.0-171.0-120.0-109.0-135.0-113.0NANANANANANANA
us-gaap:NetCashProvidedByUsedInFinancingActivities ▁▃▆▃▂▃▃▂▃▃▃▃▅▃▃▃▂▅█▃▂▄▃▃▂▃▃-1349.0-268.01865.0255.0-317.0275.0250.0-449.0264.016.0-282.0-201.01184.0-60.0-218.0-64.0-572.01689.03505.0208.0-476.0698.038.0151.0-560.018.0-182.0
 us-gaap:NetCashProvidedByUsedInFinancingActivities dei:LegalEntity exc:AtlanticCityElectricCompany▄▆▄▁▇▆▃▇▃▄▂▄▂▁▂█▃▂▆▃28.075.034.0-44.093.066.0-11.094.011.018.0-15.022.0-20.0-52.0-26.0127.011.0-18.064.0-6.0NANANANANANANA
 us-gaap:NetCashProvidedByUsedInFinancingActivities dei:LegalEntity exc:BaltimoreGasAndElectricCompany▆▆▄▆▅▄▅▅▄▆▄▃▄▂█▄▅▄▄▃▅▄▄▄▅▁▇195.0215.04.0211.067.015.0128.038.0-84.0134.0-12.0-101.01.0-307.0404.0-32.080.012.0-82.0-172.064.0-55.0-38.0-56.058.0-365.0264.0
 us-gaap:NetCashProvidedByUsedInFinancingActivities dei:LegalEntity exc:CommonwealthEdisonCo▃▄█▄▄▆▅▄▆▄▆▄▆▄▁▇▅▄▄▆▄▄▄▆▄▄▄-245.0-1.0857.021.0-86.0349.0130.0-1.0407.0-23.0451.02.0359.022.0-707.0558.0182.056.0-85.0314.052.03.0-40.0344.0-21.0-57.0-25.0
 us-gaap:NetCashProvidedByUsedInFinancingActivities dei:LegalEntity exc:DelmarvaPowerandLightCompany▂▆▂▂▃▁▂█▁▇▃▃▁▆▃▄▄▃▄▃-27.093.0-11.0-16.04.0-36.0-19.0133.0-45.0106.01.01.0-44.081.016.038.027.018.028.07.0NANANANANANANA
 us-gaap:NetCashProvidedByUsedInFinancingActivities dei:LegalEntity exc:ExelonGenerationCoLLC▃▁█▅▅▅▅▅▆▅▄▅█▅▅▅▆▇▄▆▅▇▄▆▆▆▆-1158.0-1993.0773.0-306.0-284.0-376.0-302.0-461.0-57.0-284.0-655.0-224.0582.0-233.0-266.0-603.0-58.0476.0-711.0-186.0-237.0381.0-752.071.0-133.0-30.0-134.0
 us-gaap:NetCashProvidedByUsedInFinancingActivities dei:LegalEntity exc:PecoEnergyCo▄█▇▇▅▆▆▄▄▄█▄▄▁▇▄█▅▄▅▁█▄▄▁█▃-69.0262.0146.0209.0-39.055.049.0-47.0-53.0-71.0265.0-72.0-72.0-340.0217.0-71.0223.0-42.0-92.0-6.0-327.0239.0-82.0-80.0-356.0254.0-175.0
 us-gaap:NetCashProvidedByUsedInFinancingActivities dei:LegalEntity exc:PepcoHoldingsLLC▄▆▄▁▆▃▂█▃▅▁▆▄73.0182.060.0-107.0166.033.0-38.0311.0-13.0145.0-84.0179.066.0NANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInFinancingActivities dei:LegalEntity exc:PotomacElectricPowerCompany▆▃▇▁▆▄▃▅▃▄▁▇▆▂▂▇▂▃▂█137.0-15.0176.0-90.0102.055.0-15.089.09.020.0-75.0160.0114.0-28.0-36.0167.0-45.0-11.0-41.0200.0NANANANANANANA
us-gaap:CashAndCashEquivalentsPeriodIncreaseDecrease ▂▄▄▄▂▂▄▃▃▂▃▃▃▁▃▄▂▄█▃▁▄▃▂▃▃▃-200.0688.0870.01000.0-136.0-467.01293.0-71.0-91.0-305.0667.0-73.0-26.0-1262.0250.0687.0-763.01251.04189.0-53.0-885.01401.0448.0-695.0-35.0653.0219.0
 us-gaap:CashAndCashEquivalentsPeriodIncreaseDecrease dei:LegalEntity exc:AtlanticCityElectricCompany▆▆▅▆▅▆▆▅▆▆▆▂▂▁▇█▆▆▆▆5.0-1.0-5.08.0-5.0-2.06.0-6.06.0-3.0-2.0-47.0-47.0-64.014.029.0-1.01.0-3.04.0NANANANANANANA
 us-gaap:CashAndCashEquivalentsPeriodIncreaseDecrease dei:LegalEntity exc:BaltimoreGasAndElectricCompany▆▇▅▆▅▅▆▅▅▅▅▅▅▂█▅▅▅▅▅▅▅▅▅▅▁█131.0184.0-13.0122.0-7.03.0108.0-16.06.0-12.017.01.0-12.0-318.0336.00.0-18.03.0-17.0-23.037.012.0-8.0-8.024.0-450.0342.0
 us-gaap:CashAndCashEquivalentsPeriodIncreaseDecrease dei:LegalEntity exc:CommonwealthEdisonCo▃▄▇▅▅▄▅▄▅▄▆▄▄▅▁█▅▄▄▅▅▄▄▄▄▄▅-216.0-109.0430.055.038.0-52.0137.0-19.018.0-181.0218.08.0-25.012.0-692.0715.016.00.0-57.042.022.06.0-3.05.02.0-59.063.0
 us-gaap:CashAndCashEquivalentsPeriodIncreaseDecrease dei:LegalEntity exc:DelmarvaPowerandLightCompany▃▃▂▃▂▂▁█▃▃▂▁▂▄▂▃▃▃▃▃20.0-1.0-6.07.0-4.0-16.0-31.0134.05.0-1.0-3.0-38.0-2.042.0-11.012.00.0-1.0-1.03.0NANANANANANANA
 us-gaap:CashAndCashEquivalentsPeriodIncreaseDecrease dei:LegalEntity exc:ExelonGenerationCoLLC▄▂▆▆▄▃▇▃▅▄▄▃▄▄▄▄▃▄▄▃▂█▃▁▅▇▄87.0-335.0522.0448.021.0-227.0789.0-187.0183.056.095.0-135.0110.0-85.02.0-4.0-114.089.0-76.0-248.0-531.01006.0-261.0-692.0330.0706.0-3.0
 us-gaap:CashAndCashEquivalentsPeriodIncreaseDecrease dei:LegalEntity exc:PecoEnergyCo▃▇▄▆▄▄▅▄▂▄▆▄▄▁▆▅▆▄▄▄▂▆▄▃▁█▂-138.0349.011.0204.0-21.0-88.084.0-3.0-249.0-59.0285.017.0-35.0-453.0313.0190.0263.06.0-12.08.0-316.0253.0-5.0-119.0-392.0553.0-246.0
 us-gaap:CashAndCashEquivalentsPeriodIncreaseDecrease dei:LegalEntity exc:PepcoHoldingsLLC█▄▂▅▄▁▃█▄▁▄▅▂158.0-12.0-83.044.017.0-95.0-39.0150.08.0-107.0-12.041.0-63.0NANANANANANANANANANANANANANA
 us-gaap:CashAndCashEquivalentsPeriodIncreaseDecrease dei:LegalEntity exc:PotomacElectricPowerCompany█▄▄▄▅▄▃▅▅▁▄█▄▂▄▇▄▄▁█106.01.0-12.00.06.0-7.0-33.032.08.0-112.0-2.0111.0-1.0-93.0-25.0103.0-5.0-12.0-104.0120.0NANANANANANANA
  2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
us-gaap:DepreciationDepletionAndAmortization █▁▁▃▃▃▄▃▃1289.01001.01021.01083.01079.01075.01105.01088.01091.0NANANANANANANANANANANANANANANANANANA
us-gaap:IncreaseDecreaseInInventories ▆▆▄▆▆▃▆▆▃▅▆▇▃▅▆▆▆▆▇▁▆▇█▄▅▆▇53.095.0-81.0113.0109.0-128.084.0107.0-167.0-15.064.0132.0-109.014.068.053.061.094.0132.0-291.064.0166.0230.0-80.0-3.085.0119.0
us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet █▇▃▂▃▄▂▁▄▂▂▂▃▂▁▃▁▄▁▁▂▃▂▃▁▂▂1614.01321.0488.0109.0383.0587.0198.0-54.0495.0144.066.042.0439.084.0-56.0282.0-93.0694.0-99.0-115.022.0256.02.0278.0-137.0168.0100.0
us-gaap:NetCashProvidedByUsedInOperatingActivities ▄▄▃▇▅▃▇▆▄▅▇▅▃▃▇█▅▅▇▄▃▅▄▁▅▆▄1542.01600.01080.02501.01854.01044.02806.02367.01502.01803.02779.01697.01201.01082.02810.03080.01942.01705.02479.01490.0814.01892.01586.0165.01949.02056.01479.0
 us-gaap:NetIncomeLoss dei:LegalEntity exc:ExelonGenerationCoLLC▂▃▂▂▂▃▂▂▂█▃▁▃▂▂▂49.0476.045.0257.0108.0363.0234.0178.0136.02224.0305.0-250.0423.0-42.0236.0-8.0NANANANANANANANANANANA
us-gaap:ProfitLoss ▃▃▂▄▃▄▄▃▃█▄▁▅▂▃▂▂▃▃▄▁▅▃▁▃▄▃569.0574.0376.0760.0494.0966.0800.0542.0636.01938.0867.064.0981.0248.0526.0306.0309.0587.0633.0738.018.01074.0557.093.0495.0736.0497.0
  2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
us-gaap:NetCashProvidedByUsedInInvestingActivities █▇▂▃▄▃▃▂▃▂▃▄▁▁▁▁▂▂▃▃▅▅▅▆▄▄▆-393.0-644.0-2075.0-1756.0-1673.0-1786.0-1763.0-1989.0-1857.0-2124.0-1830.0-1569.0-2411.0-2284.0-2342.0-2329.0-2133.0-2143.0-1795.0-1751.0-1223.0-1189.0-1176.0-1011.0-1424.0-1421.0-1078.0
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity exc:AtlanticCityElectricCompany▃▆▄▆▄▁▆▃▇▇▇▅▅▅▇▇▅▆▅█-103.0-78.0-95.0-73.0-99.0-128.0-76.0-108.0-64.0-69.0-68.0-88.0-85.0-82.0-67.0-60.0-90.0-76.0-87.0-53.0NANANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity exc:BaltimoreGasAndElectricCompany▁▂▁▁▂▃▃▄▄▂▄▄▅▁▃▅▅▄▇▇▇▆▇▅▆▆█-286.0-263.0-289.0-300.0-281.0-257.0-231.0-205.0-223.0-263.0-203.0-202.0-181.0-296.0-239.0-184.0-184.0-216.0-143.0-132.0-142.0-148.0-145.0-187.0-162.0-152.0-103.0
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity exc:CommonwealthEdisonCo▇▇▇█▇▇▇▇▇▇▇▇▇▆▇▁▆▇▇▇▇██████-550.0-532.0-501.0-444.0-452.0-492.0-509.0-486.0-523.0-565.0-565.0-637.0-529.0-766.0-606.0-1939.0-716.0-602.0-521.0-523.0-507.0-417.0-401.0-330.0-345.0-349.0-357.0
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity exc:DelmarvaPowerandLightCompany█▁▄▅▅▅▅▄▆▁▄▃▅▅▆▄▄▄▅▇-39.0-143.0-99.0-85.0-81.0-78.0-88.0-100.0-65.0-136.0-102.0-111.0-80.0-82.0-74.0-99.0-105.0-92.0-87.0-61.0NANANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity exc:ExelonGenerationCoLLC██▂▄▃▃▄▂▃▃▃▄▁▃▁▂▁▁▂▂▄▃▃▃▂▂▃1163.0997.0-871.0-291.0-541.0-433.0-257.0-934.0-615.0-689.0-546.0-145.0-1212.0-573.0-1068.0-1006.0-1049.0-1170.0-951.0-899.0-336.0-417.0-420.0-594.0-767.0-771.0-513.0
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity exc:PecoEnergyCo▂▄▂▃▃▃▃▃▃▄▃▃▆▁▄▇▄▄▄▄▃▄▄▃▄█▁-311.0-161.0-280.0-225.0-223.0-220.0-203.0-191.0-215.0-140.0-215.0-215.0-27.0-360.0-147.060.0-163.0-144.0-137.0-144.0-197.0-150.0-120.0-182.0-163.0146.0-343.0
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity exc:PepcoHoldingsLLC▂▆▃▆▄▃▃▃█▁▅▄▅-385.0-309.0-375.0-307.0-339.0-357.0-359.0-369.0-258.0-407.0-320.0-347.0-323.0NANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity exc:PotomacElectricPowerCompany▁█▁▆▄▅▄▅▆▄▅▅▅▃▅▄▆▆▅▆-305.0-29.0-298.0-118.0-192.0-143.0-187.0-158.0-127.0-191.0-146.0-149.0-144.0-212.0-128.0-171.0-120.0-109.0-135.0-113.0NANANANANANANA
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment ▅▅▆▅▅▆▅▆▆▇▅▅▇▇▆█▇▆▄▅▆▄▂▂▄▃▁1833.01757.02016.01687.01702.01873.01690.01927.01880.02028.01711.01731.02114.02185.01879.02287.02181.01983.01676.01784.01963.01613.01284.01217.01508.01369.01071.0
  2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
us-gaap:NetCashProvidedByUsedInFinancingActivities ▁▃▆▃▂▃▃▂▃▃▃▃▅▃▃▃▂▅█▃▂▄▃▃▂▃▃-1349.0-268.01865.0255.0-317.0275.0250.0-449.0264.016.0-282.0-201.01184.0-60.0-218.0-64.0-572.01689.03505.0208.0-476.0698.038.0151.0-560.018.0-182.0
 us-gaap:NetCashProvidedByUsedInFinancingActivities dei:LegalEntity exc:AtlanticCityElectricCompany▄▆▄▁▇▆▃▇▃▄▂▄▂▁▂█▃▂▆▃28.075.034.0-44.093.066.0-11.094.011.018.0-15.022.0-20.0-52.0-26.0127.011.0-18.064.0-6.0NANANANANANANA
 us-gaap:NetCashProvidedByUsedInFinancingActivities dei:LegalEntity exc:BaltimoreGasAndElectricCompany▆▆▄▆▅▄▅▅▄▆▄▃▄▂█▄▅▄▄▃▅▄▄▄▅▁▇195.0215.04.0211.067.015.0128.038.0-84.0134.0-12.0-101.01.0-307.0404.0-32.080.012.0-82.0-172.064.0-55.0-38.0-56.058.0-365.0264.0
 us-gaap:NetCashProvidedByUsedInFinancingActivities dei:LegalEntity exc:CommonwealthEdisonCo▃▄█▄▄▆▅▄▆▄▆▄▆▄▁▇▅▄▄▆▄▄▄▆▄▄▄-245.0-1.0857.021.0-86.0349.0130.0-1.0407.0-23.0451.02.0359.022.0-707.0558.0182.056.0-85.0314.052.03.0-40.0344.0-21.0-57.0-25.0
 us-gaap:NetCashProvidedByUsedInFinancingActivities dei:LegalEntity exc:DelmarvaPowerandLightCompany▂▆▂▂▃▁▂█▁▇▃▃▁▆▃▄▄▃▄▃-27.093.0-11.0-16.04.0-36.0-19.0133.0-45.0106.01.01.0-44.081.016.038.027.018.028.07.0NANANANANANANA
 us-gaap:NetCashProvidedByUsedInFinancingActivities dei:LegalEntity exc:ExelonGenerationCoLLC▃▁█▅▅▅▅▅▆▅▄▅█▅▅▅▆▇▄▆▅▇▄▆▆▆▆-1158.0-1993.0773.0-306.0-284.0-376.0-302.0-461.0-57.0-284.0-655.0-224.0582.0-233.0-266.0-603.0-58.0476.0-711.0-186.0-237.0381.0-752.071.0-133.0-30.0-134.0
 us-gaap:NetCashProvidedByUsedInFinancingActivities dei:LegalEntity exc:PecoEnergyCo▄█▇▇▅▆▆▄▄▄█▄▄▁▇▄█▅▄▅▁█▄▄▁█▃-69.0262.0146.0209.0-39.055.049.0-47.0-53.0-71.0265.0-72.0-72.0-340.0217.0-71.0223.0-42.0-92.0-6.0-327.0239.0-82.0-80.0-356.0254.0-175.0
 us-gaap:NetCashProvidedByUsedInFinancingActivities dei:LegalEntity exc:PepcoHoldingsLLC▄▆▄▁▆▃▂█▃▅▁▆▄73.0182.060.0-107.0166.033.0-38.0311.0-13.0145.0-84.0179.066.0NANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInFinancingActivities dei:LegalEntity exc:PotomacElectricPowerCompany▆▃▇▁▆▄▃▅▃▄▁▇▆▂▂▇▂▃▂█137.0-15.0176.0-90.0102.055.0-15.089.09.020.0-75.0160.0114.0-28.0-36.0167.0-45.0-11.0-41.0200.0NANANANANANANA
us-gaap:ProceedsFromIssuanceOfLongTermDebt ▁▇▅▂▂▂▃▂▃▂▃▁▂▁▃▆▂▁█▃▁▃▃▂▁▃▂230.03874.02652.0726.0448.0402.01176.0358.01130.0854.01635.0218.0763.0228.01314.03023.0800.02.04701.01206.0251.01112.01150.0950.024.01522.0360.0
us-gaap:RepaymentsOfLongTermDebt ▄█▃▁▁▂▁▁▄▃▃▃▁▃▃▁▃▁▄▂▂▁▁▄▂▂▂1264.02862.01032.070.0222.0352.0171.068.01241.0762.0679.0984.065.0992.0727.0101.0942.037.01128.0580.0331.023.041.01150.0433.0540.0615.0
us-gaap:PaymentsOfDividendsCommonStock ███▇▇▇▅▅▅▄▄▄▃▃▃▃▂▂▁▁▁▁▁▁▁▁▁373.0373.0373.0351.0352.0352.0333.0333.0333.0315.0314.0304.0303.0293.0291.0295.0286.0282.0268.0269.0266.0266.0267.0266.0268.0265.0266.0
  2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30

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
Value1945419412193731936219336193031927419238192091917119116190631900818973189641886218860188071879418756187221868618676186471675516731167091667916651167511674116716166931665216632165941655916512910790779054903290068923
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 Assets15.014.915.015.215.315.515.415.715.815.816.016.016.216.216.315.916.116.116.416.416.616.719.619.618.219.119.219.619.921.120.921.021.321.321.221.221.421.316.516.817.417.617.218.1

us-gaap:CommonStockValue dei:LegalEntity

exc:AtlanticCityElectricCompany


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value157415741271127112701155115411341134984979912912912912912912912912912912773773
Percentage of CommonStockValue8.18.16.66.66.66.06.05.95.95.15.14.84.84.84.84.84.84.84.94.94.94.14.1
Percentage of Assets1.21.21.01.01.00.90.90.90.90.80.80.80.80.80.80.80.80.80.80.80.80.70.8
Percentage of Assets exc:AtlanticCityElectricCompany35.233.629.730.331.129.029.329.029.226.026.524.725.225.826.526.026.226.426.426.026.422.822.8

exc:BaltimoreGasAndElectricCompany


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value231823182318219119331907190718181714171417141623160516051605149814211421142113881381138113671366136013601360136013601360136013601360136013601360136012941294
Percentage of CommonStockValue11.911.912.011.310.09.99.99.58.98.99.08.58.48.58.57.97.57.67.67.47.47.47.37.38.18.18.18.28.28.18.18.18.18.28.28.28.27.814.2
Percentage of Assets1.81.81.81.71.51.51.51.51.41.41.41.41.41.41.41.31.21.21.21.21.21.21.41.41.51.61.61.61.61.71.71.71.71.71.71.71.81.72.3
Percentage of Assets exc:BaltimoreGasAndElectricCompany19.019.719.919.317.517.717.917.617.117.217.617.017.417.517.616.816.216.116.315.716.616.516.516.817.016.716.817.217.317.117.317.817.117.818.118.118.917.618.0

exc:DelmarvaPowerandLightCompany


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value12091209108910891083983977914914914914914914764764764764764764725725612612
Percentage of CommonStockValue6.26.25.65.65.65.15.14.84.84.84.84.84.84.04.04.14.14.14.13.93.93.33.3
Percentage of Assets0.90.90.80.90.90.80.80.70.80.80.80.80.80.70.70.60.70.70.70.60.60.50.6
Percentage of Assets exc:DelmarvaPowerandLightCompany23.123.121.221.821.820.320.219.319.519.619.919.920.017.417.517.918.018.218.418.018.315.515.4

exc:PecoEnergyCo


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
Value34093014301430142997299727662752272327232578256025302489248924892473247324732473245524552455245524392439243924392415241524152388238823882388237923792379237923792361236123612318
Percentage of CommonStockValue17.515.515.615.615.515.514.414.314.214.213.513.413.313.113.113.213.113.113.213.213.113.113.113.214.614.614.614.614.514.414.414.314.314.314.414.314.414.426.126.226.126.126.226.0
Percentage of Assets2.62.32.32.42.42.42.22.22.22.22.22.12.22.12.12.12.12.12.22.22.22.22.62.62.62.82.82.92.93.03.03.03.03.13.03.03.13.14.34.44.54.64.54.7
Percentage of Assets exc:PecoEnergyCo25.323.324.124.424.726.024.124.224.824.924.224.124.524.424.521.722.422.622.822.423.223.523.724.424.124.024.524.324.724.725.124.525.425.225.524.625.825.826.025.526.226.526.325.7

exc:PotomacElectricPowerCompany


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value21962196205820581933193317961765176516501636155515551470147014701470130913091309130911221122
Percentage of CommonStockValue11.311.310.610.610.010.09.39.29.28.68.68.28.27.77.87.87.87.07.07.07.06.06.0
Percentage of Assets1.71.71.61.61.51.61.41.41.51.41.41.31.31.31.31.21.31.11.11.11.21.01.2
Percentage of Assets exc:PotomacElectricPowerCompany22.923.122.222.321.821.920.720.520.619.619.719.019.118.618.818.919.217.617.818.118.416.316.2

us-gaap:CommonStockValue us-gaap:ConsolidatedEntities

srt:ParentCompany


Common
Period End2020-12-312019-12-312018-12-31
Value193731927419116
Percentage of CommonStockValue100.0100.0100.0
Percentage of Assets15.015.416.0
Percentage of Assets srt:ParentCompany38.339.040.3

Shares Issued

us-gaap:SharesIssued

us-gaap:SharesIssued


Shares
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-312012-12-312011-12-31
Value979979977977976976974973973972786970968967967965962961960958958957956954954896895894894892889698
Percentage of SharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding

us-gaap:CommonStockSharesOutstanding


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-03-312015-12-312015-06-302015-03-312014-12-312014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312011-01-312010-12-312009-12-31
Value978977976976975974973972972970968967965965963960960926924858919861861859893858857856856855854854853852663663663662661661659
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 dei:LegalEntity, us-gaap:StatementClassOfStock

exc:AtlanticCityElectricCompany, us-gaap:CommonStock


Common
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value9.09.08.5460178.5460178.546017
Percentage of CommonStockSharesOutstanding0.90.90.90.90.9

exc:CommonwealthEdisonCo, us-gaap:CommonStock


Common
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value127127127127127
Percentage of CommonStockSharesOutstanding13.013.113.113.213.7

exc:PecoEnergyCo, us-gaap:CommonStock


Common
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value170170170170170
Percentage of CommonStockSharesOutstanding17.417.517.617.718.4

us-gaap:CommonStockSharesOutstanding us-gaap:ConsolidatedEntities

srt:ParentCompany


Common
Period End2020-12-312019-12-31
Value976973
Percentage of CommonStockSharesOutstanding100.0100.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value979977977976976974974972970969968967965936930928927926925924915866867868863864861860860860855857857856707666665664664663663662662662662661661
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value978977976976975973972971968967966964962934928925925924923921913863862861861860858856857856855854854853705664663663662662662661661660660659659
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount


Antidilutive
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-06-302019-03-312018-09-302018-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value0.00.01.01.00.00.00.02.02.0134.013152.0161820170.018171110.010.09.09.09.06.0
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount0.00.0100.0100.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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
Value0.41-0.30.370.510.530.60.790.790.50.930.160.760.560.611.940.860.091.070.220.530.290.190.340.690.740.80.021.150.610.10.60.860.57-0.010.440.350.340.280.910.910.931.010.791.280.671.130.881.151.01.08
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
Value0.41-0.30.370.510.530.60.790.790.50.930.160.760.560.61.930.850.091.070.220.530.290.190.330.690.740.80.021.150.60.10.590.860.57-0.010.440.350.330.280.910.90.931.010.791.270.671.130.881.140.991.08
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
Value458-235.06352956260354179950689026785582656197386811598546562337151263619683749-672.010636889711157484979522205175451696570509694-71.01096611143
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 RevenueFromRelatedParties0.00.00.052900.056200.060300.00.00.00.00.00.00.00.00.00.00.00.00.00.056200.033700.00.00.030950.068300.074900.00.00.00.09700.00.037400.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ComprehensiveIncomeNetOfTax dei:LegalEntity

exc:ExelonGenerationCoLLC


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
Value-59.0-792.0255247836401257108365-184.02361791422214309-249.0436-53.027528256129319396468-65.0823217-206.0236453194-121.0-100.0-65.0-98.0420796261189425-18.0897-163.01112
Percentage of ComprehensiveIncomeNetOfTax-12.9337.039.79.885.16.074.132.221.341.0-707.730.130.821.6112.235.6-216.544.3-115.248.98.3169.549.051.558.062.59.777.431.5-212.421.260.639.0-127.4-454.5-31.7-56.093.1114.445.837.161.225.481.8-267.297.3
Percentage of RevenueFromRelatedParties0.00.00.05200.047800.03600.00.00.00.00.00.00.00.00.00.00.00.00.00.027500.02800.00.00.015950.039600.046800.00.00.00.0-20600.00.022650.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:ExelonGenerationCoLLC-23.2-268.50.015.7176.410.90.093.542.9115.10.076.665.635.70.0104.4-92.9132.10.054.87.895.50.0154.9258.8221.80.0734.8108.0-61.70.0118.055.1-30.90.0-13.7-23.3113.50.00.00.00.00.00.00.00.0

exc:PepcoHoldingsLLC


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value1411287721694108651891061176218784653.015366140
Percentage of ComprehensiveIncomeNetOfTax30.8-54.5122.240.816.717.912.023.720.913.1238.523.814.49.90.217.657.414.2
Percentage of RevenueFromRelatedParties0.00.00.021600.09400.010800.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:PepcoHoldingsLLC3525.04266.70.03600.03133.33600.00.04725.03533.33900.00.06233.32800.01625.00.01275.0550.01166.7

Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value7525766853-206.036-9.09.058-48.0674.0526743-16.0-16.0493139-50.0-19.0-42.0-5.0
Percentage of ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromRelatedParties0.00.00.06800.05300.0-20600.00.00.00.00.00.00.00.00.00.00.00.00.00.03100.03900.00.00.0-2100.0-500.0

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest dei:LegalEntity

exc:ExelonGenerationCoLLC


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-06-30
Value7424756853-206.036-10.09.058-48.0664.0516543-16.0-16.0493036-53.0-8.0
Percentage of ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest98.796.098.7100.0100.0100.0100.0111.1100.0100.0100.098.5100.098.197.0100.0100.0100.0100.096.892.3106.0160.0
Percentage of RevenueFromRelatedParties0.00.00.06800.05300.0-20600.00.00.00.00.00.00.00.00.00.00.00.00.00.03000.03600.00.0-800.0
Percentage of RevenueFromRelatedParties exc:ExelonGenerationCoLLC29.18.10.020.519.6-62.40.0-3.63.618.30.021.41.512.80.014.5-6.0-4.80.06.010.1-19.8-5.2

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value533-210.0139597615397577790515948-22.0852586708204091199969137531298151263661688
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromRelatedParties0.00.00.059700.061500.039700.00.00.00.00.00.00.00.00.00.00.00.00.00.053100.029800.00.00.033050.068800.0

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest dei:LegalEntity

exc:AtlanticCityElectricCompany


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value37146.075181312631410.0-1.0618.07.00.0418.0288.0473.0-100.0
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest6.9-6.74.312.62.93.32.18.02.71.14.57.21.41.00.04.58.12.95.88.91.0-66.2
Percentage of RevenueFromRelatedParties0.00.00.07500.01800.01300.00.00.00.00.00.00.00.00.00.00.00.00.00.04700.0300.00.0
Percentage of RevenueFromRelatedParties exc:AtlanticCityElectricCompany3700.01400.00.07500.01800.01300.00.06300.01400.01000.00.06100.0800.0700.00.00.0800.02800.00.04700.0300.0-10000.0

exc:BaltimoreGasAndElectricCompany


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value452097653391819955451607163511287662451251115431101865144
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest8.4-99.554.78.96.345.617.27.08.716.9-322.77.48.718.13.76.845.512.981.010.210.466.932.77.76.4
Percentage of RevenueFromRelatedParties0.00.00.05300.03900.018100.00.00.00.00.00.00.00.00.00.00.00.00.00.05400.03100.00.00.02550.04400.0
Percentage of RevenueFromRelatedParties exc:BaltimoreGasAndElectricCompany642.93483.30.0883.3975.03016.70.0916.7750.02666.70.01050.0850.02133.30.02066.71500.02500.00.0771.4775.02020.00.01700.04400.0

exc:CommonwealthEdisonCo


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value192197134196-61.01681442001861571411931641651201891181418137145115
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest36.0-93.896.432.8-9.942.325.025.336.116.6-640.922.728.023.35.920.7119.214.659.17.048.776.2
Percentage of RevenueFromRelatedParties0.00.00.019600.0-6100.016800.00.00.00.00.00.00.00.00.00.00.00.00.00.03700.014500.00.0
Percentage of RevenueFromRelatedParties exc:CommonwealthEdisonCo3840.03283.30.01306.7-554.53360.00.05000.03720.03925.00.04825.03280.01178.60.06300.03933.32820.00.0925.04833.32300.0

exc:DelmarvaPowerandLightCompany


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-03-312016-03-31
Value3056342719453133305330332631143157-72.0
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest5.6-26.724.54.53.111.35.44.25.85.6-136.43.94.44.40.73.45.9-47.7
Percentage of RevenueFromRelatedParties0.00.00.02700.01900.04500.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:DelmarvaPowerandLightCompany1500.02800.00.0900.0950.02250.00.03300.01500.02650.00.01650.01300.01550.00.01550.02850.0-3600.0

exc:ExelonGenerationCoLLC


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value15-768.0100120531-170.0437247117423-232.03021831932279352-265.042022245-8.0256119364404
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest2.8365.771.920.186.3-42.875.731.322.744.61054.535.431.227.3111.738.6-267.743.316.146.1-2.7169.545.255.158.7
Percentage of RevenueFromRelatedParties0.00.00.012000.053100.0-17000.00.00.00.00.00.00.00.00.00.00.00.00.00.024500.0-800.00.00.018200.040400.0
Percentage of RevenueFromRelatedParties exc:ExelonGenerationCoLLC5.9-260.30.036.3195.9-51.50.089.846.4133.40.098.167.048.50.0118.9-98.9127.30.048.8-2.295.50.0176.7264.1

exc:PecoEnergyCo


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value10416713013839140118140102168124126961131071128812792122100124
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest19.5-79.593.523.16.335.320.517.719.817.7-563.614.816.416.05.212.388.913.167.223.033.682.1
Percentage of RevenueFromRelatedParties0.00.00.013800.03900.014000.00.00.00.00.00.00.00.00.00.00.00.00.00.012200.010000.00.0
Percentage of RevenueFromRelatedParties exc:PecoEnergyCo5200.08350.00.04600.01950.07000.00.014000.05100.016800.00.06300.04800.05650.00.05600.04400.012700.00.06100.05000.012400.0

exc:PotomacElectricPowerCompany


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value7559391185752269864553689543117874358227949-108.0
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest14.1-28.128.119.89.313.14.512.412.45.8-163.610.49.24.40.89.543.46.016.114.916.4-71.5
Percentage of RevenueFromRelatedParties0.00.00.011800.05700.05200.00.00.00.00.00.00.00.00.00.00.00.00.00.07900.04900.00.0
Percentage of RevenueFromRelatedParties exc:PotomacElectricPowerCompany7500.05900.00.03933.35700.05200.00.04900.06400.02750.00.04450.02700.01550.00.08700.04300.05800.00.07900.04900.0-10800.0

Cost Of Goods And Services Sold Depreciation And Amortization

us-gaap:CostOfGoodsAndServicesSoldDepreciationAndAmortization

us-gaap:CostOfGoodsAndServicesSoldDepreciationAndAmortization


Cost
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
Value1666169717021289100110211015108310791075106911051088
Percentage of CostOfGoodsAndServicesSoldDepreciationAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromRelatedParties0.00.00.0128900.0100100.0102100.00.00.00.00.00.00.00.0

us-gaap:CostOfGoodsAndServicesSoldDepreciationAndAmortization dei:LegalEntity

exc:AtlanticCityElectricCompany


Cost
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
Value40474648444343434031293836
Percentage of CostOfGoodsAndServicesSoldDepreciationAndAmortization2.42.82.73.74.44.24.24.03.72.92.73.43.3
Percentage of RevenueFromRelatedParties0.00.00.04800.04400.04300.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:AtlanticCityElectricCompany4000.04700.00.04800.04400.04300.00.04300.04000.03100.00.03800.03600.0

exc:BaltimoreGasAndElectricCompany


Cost
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
Value141152145133129143134116117136125110114
Percentage of CostOfGoodsAndServicesSoldDepreciationAndAmortization8.59.08.510.312.914.013.210.710.812.711.710.010.5
Percentage of RevenueFromRelatedParties0.00.00.013300.012900.014300.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:BaltimoreGasAndElectricCompany2014.32533.30.02216.73225.02383.30.01933.31950.02266.70.01833.31900.0

exc:CommonwealthEdisonCo


Cost
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
Value296292292294274273266259257251244237231
Percentage of CostOfGoodsAndServicesSoldDepreciationAndAmortization17.817.217.222.827.426.726.223.923.823.322.821.421.2
Percentage of RevenueFromRelatedParties0.00.00.029400.027400.027300.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:CommonwealthEdisonCo5920.04866.70.01960.02490.95460.00.06475.05140.06275.00.05925.04620.0

exc:DelmarvaPowerandLightCompany


Cost
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
Value51534848474846464546474743
Percentage of CostOfGoodsAndServicesSoldDepreciationAndAmortization3.13.12.83.74.74.74.54.24.24.34.44.34.0
Percentage of RevenueFromRelatedParties0.00.00.04800.04700.04800.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:DelmarvaPowerandLightCompany2550.02650.00.01600.02350.02400.00.04600.02250.02300.00.02350.02150.0

exc:ExelonGenerationCoLLC


Cost
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
Value930940962558300304314407409405414468466
Percentage of CostOfGoodsAndServicesSoldDepreciationAndAmortization55.855.456.543.330.029.830.937.637.937.738.742.442.8
Percentage of RevenueFromRelatedParties0.00.00.055800.030000.030400.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:ExelonGenerationCoLLC366.1318.60.0168.6110.792.10.0148.0162.3127.80.0151.9170.7

exc:PecoEnergyCo


Cost
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
Value87868885888686838381777574
Percentage of CostOfGoodsAndServicesSoldDepreciationAndAmortization5.25.15.26.68.88.48.57.77.77.57.26.86.8
Percentage of RevenueFromRelatedParties0.00.00.08500.08800.08600.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:PecoEnergyCo4350.04300.00.02833.34400.04300.00.08300.04150.08100.00.03750.03700.0

exc:PepcoHoldingsLLC


Cost
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
Value194210197200191194192193188180185192180
Percentage of CostOfGoodsAndServicesSoldDepreciationAndAmortization11.612.411.615.519.119.018.917.817.416.717.317.416.5
Percentage of RevenueFromRelatedParties0.00.00.020000.019100.019400.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:PepcoHoldingsLLC4850.07000.00.03333.36366.76466.70.04825.06266.76000.00.06400.06000.0

exc:PotomacElectricPowerCompany


Cost
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
Value961029596929593959394999992
Percentage of CostOfGoodsAndServicesSoldDepreciationAndAmortization5.86.05.67.49.29.39.28.88.68.79.39.08.5
Percentage of RevenueFromRelatedParties0.00.00.09600.09200.09500.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:PotomacElectricPowerCompany9600.010200.00.03200.09200.09500.00.04750.09300.04700.00.04950.04600.0

us-gaap:CostOfGoodsAndServicesSoldDepreciationAndAmortization dei:LegalEntity, us-gaap:PublicUtility

exc:ExelonGenerationCoLLC, exc:GenerationNewEngland


Cost
Period End2021-06-302021-03-312020-12-31
Value212020
Percentage of CostOfGoodsAndServicesSoldDepreciationAndAmortization1.31.21.2
Percentage of RevenueFromRelatedParties0.00.00.0
Percentage of RevenueFromRelatedParties exc:ExelonGenerationCoLLC exc:GenerationNewEngland0.00.00.0

us-gaap:CostOfGoodsAndServicesSoldDepreciationAndAmortization us-gaap:PublicUtility

exc:GenerationNewEngland


Cost
Period End2021-06-30
Value21
Percentage of CostOfGoodsAndServicesSoldDepreciationAndAmortization1.3
Percentage of RevenueFromRelatedParties0.0
Percentage of RevenueFromRelatedParties exc:GenerationNewEngland0.0

exc:MidwestAssetGroup


Cost
Period End2021-03-31
Value20
Percentage of CostOfGoodsAndServicesSoldDepreciationAndAmortization1.2
Percentage of RevenueFromRelatedParties0.0
Percentage of RevenueFromRelatedParties exc:MidwestAssetGroup0.0

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
Value75611008278538087676975297393755968818262810782527138864873347300739276917072773662947099600162035387746570165513545670555277528551155565555859725183430529284114355338503554392533803059
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 RevenueFromRelatedParties0.00.00.0808700.0676900.0752900.00.00.00.00.00.00.00.00.00.00.00.00.00.0773600.0629400.00.00.0310150.0538700.0746500.00.00.00.0705500.00.0264250.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CostsAndExpenses dei:LegalEntity

exc:AtlanticCityElectricCompany


Costs
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value269282276338258251251340246252240322240287243291245250249338252412262335260305
Percentage of CostsAndExpenses3.62.83.54.23.83.33.44.53.63.13.03.93.43.33.34.03.33.33.54.44.05.84.45.44.84.1
Percentage of RevenueFromRelatedParties0.00.00.033800.025800.025100.00.00.00.00.00.00.00.00.00.00.00.00.00.033800.025200.00.00.016750.026000.030500.0
Percentage of RevenueFromRelatedParties exc:AtlanticCityElectricCompany26900.028200.00.033800.025800.025100.00.034000.024600.025200.00.032200.024000.028700.00.00.024500.025000.00.033800.025200.041200.00.033500.026000.030500.0

exc:BaltimoreGasAndElectricCompany


Costs
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value620752695642573688638612569756691628578800649614576723622697621742602616529832648595598885693623584717642690564707589722620823
Percentage of CostsAndExpenses8.27.58.97.98.59.18.68.18.39.28.57.68.19.38.88.47.89.48.89.09.910.510.09.99.811.19.210.811.012.513.111.811.412.911.611.610.916.420.117.517.521.4
Percentage of RevenueFromRelatedParties0.00.00.064200.057300.068800.00.00.00.00.00.00.00.00.00.00.00.00.00.069700.062100.00.00.030800.052900.083200.00.00.00.088500.00.031150.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:BaltimoreGasAndElectricCompany8857.112533.30.010700.014325.011466.70.010200.09483.312600.00.010466.79633.313333.30.020466.719200.014460.00.09957.115525.014840.00.020533.352900.011885.70.019833.329900.05531.20.031150.014600.017925.00.017250.028200.023566.70.00.00.00.0

exc:CommonwealthEdisonCo


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
Value1196121011521302134511511149125610401135113112751111122310231167103898410061109962980979104990595588593587089683387884895198912661139116210771541119012661143163912431124
Percentage of CostsAndExpenses15.812.014.716.119.915.315.516.615.113.714.015.515.614.113.916.014.012.814.214.315.313.816.316.916.812.812.617.015.912.715.816.616.617.117.821.222.027.036.837.533.532.932.241.836.836.7
Percentage of RevenueFromRelatedParties0.00.00.0130200.0134500.0115100.00.00.00.00.00.00.00.00.00.00.00.00.00.0110900.096200.00.00.052450.090500.095500.00.00.00.089600.00.043900.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:CommonwealthEdisonCo23920.020166.70.08680.012227.323020.00.031400.020800.028375.00.031875.022220.08735.70.038900.034600.019680.00.027725.032066.719600.00.0104900.090500.095500.00.093500.00.089600.00.087800.00.095100.00.00.0113900.0116200.00.00.00.00.00.00.00.00.0

exc:DelmarvaPowerandLightCompany


Costs
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value255309277296263284269268243308284277247335278268241284288263251434251282247358
Percentage of CostsAndExpenses3.43.13.53.73.93.83.63.53.53.73.53.43.53.93.83.73.33.74.13.44.06.14.24.54.64.8
Percentage of RevenueFromRelatedParties0.00.00.029600.026300.028400.00.00.00.00.00.00.00.00.00.00.00.00.00.026300.025100.00.00.014100.024700.035800.0
Percentage of RevenueFromRelatedParties exc:DelmarvaPowerandLightCompany12750.015450.00.09866.713150.014200.00.026800.012150.015400.00.013850.012350.016750.00.013400.012050.014200.00.013150.012550.021700.00.028200.012350.017900.0

exc:ExelonGenerationCoLLC


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
Value4469667246844727354744004295427440964963503549614298521843654256464147314205469336334324406941473536512050183526362047603370357134463588361638533312244514882108189919381937177217661505
Percentage of CostsAndExpenses59.166.259.658.552.458.458.156.559.560.162.160.160.260.359.558.362.861.559.560.757.760.967.866.965.668.671.564.066.367.563.967.667.464.565.164.563.956.850.851.253.450.354.545.152.249.2
Percentage of RevenueFromRelatedParties0.00.00.0472700.0354700.0440000.00.00.00.00.00.00.00.00.00.00.00.00.00.0469300.0363300.00.00.0207350.0353600.0512000.00.00.00.0476000.00.0178550.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:ExelonGenerationCoLLC1759.42261.70.01428.11308.91333.30.01554.21625.41565.60.01610.71574.41311.10.01437.81731.71433.60.0934.91014.81613.40.02013.12311.12426.50.03148.21801.01425.10.0929.9979.0915.30.0814.6788.6660.80.00.00.00.00.00.00.00.0

exc:PecoEnergyCo


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
Value5526796126586186256055955106785996035267245725464936045525845126455195865377635965605228446355735346926736285646986477936819431229128010871261
Percentage of CostsAndExpenses7.36.77.88.19.18.38.27.97.48.27.47.37.48.47.87.56.77.97.87.58.19.18.69.410.010.28.510.29.612.012.010.810.412.412.110.510.916.222.119.319.224.534.632.632.241.2
Percentage of RevenueFromRelatedParties0.00.00.065800.061800.062500.00.00.00.00.00.00.00.00.00.00.00.00.00.058400.051200.00.00.029300.053700.076300.00.00.00.084400.00.028650.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:PecoEnergyCo27600.033950.00.021933.330900.031250.00.059500.025500.067800.00.030150.026300.036200.00.027300.024650.060400.00.029200.025600.064500.00.058600.00.00.00.00.00.084400.00.057300.00.00.00.062800.056400.069800.00.00.00.00.00.00.00.00.0

exc:PepcoHoldingsLLC


Costs
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value95510589881102956100097811249261053991111692311259641025927995
Percentage of CostsAndExpenses12.610.512.613.614.113.313.214.913.512.712.213.512.913.013.114.012.512.9
Percentage of RevenueFromRelatedParties0.00.00.0110200.095600.0100000.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:PepcoHoldingsLLC23875.035266.70.018366.731866.733333.30.028100.030866.735100.00.037200.030766.728125.00.08541.77725.08291.7

exc:PotomacElectricPowerCompany


Costs
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value429466435465436462455515438491465516438501422455431451441503420656410477421482
Percentage of CostsAndExpenses5.74.65.55.76.46.16.26.86.45.95.76.36.15.85.86.25.85.96.26.56.79.26.87.77.86.5
Percentage of RevenueFromRelatedParties0.00.00.046500.043600.046200.00.00.00.00.00.00.00.00.00.00.00.00.00.050300.042000.00.00.023850.042100.048200.0
Percentage of RevenueFromRelatedParties exc:PotomacElectricPowerCompany42900.046600.00.015500.043600.046200.00.025750.043800.024550.00.025800.021900.025050.00.045500.043100.045100.00.050300.042000.065600.00.047700.042100.048200.0

Gain Loss On Investments

us-gaap:GainLossOnInvestments

us-gaap:GainLossOnInvestments


Gain
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
Value258118402255455-651.01966396308-324.0101-12.0-68.0187145109175-14.0129595590-223.0-45.04769-27.0142267568-39.0661572-33.010376-141.0114056108-95.036
Percentage of GainLossOnInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromRelatedParties0.00.00.025500.045500.0-65100.00.00.00.00.00.00.00.00.00.00.00.00.00.012900.05900.00.00.0-11150.0-4500.04700.00.00.00.02600.00.03400.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:GainLossOnInvestments dei:LegalEntity

exc:ExelonGenerationCoLLC


Gain
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
Value258118402255455-651.01966396308-324.0101-12.0-68.0187145109175-14.0129595590-223.0-45.04769-27.0142267568-39.0661572-33.010376-141.0114056108-95.036
Percentage of GainLossOnInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromRelatedParties0.00.00.025500.045500.0-65100.00.00.00.00.00.00.00.00.00.00.00.00.00.012900.05900.00.00.0-11150.0-4500.04700.00.00.00.02600.00.03400.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:ExelonGenerationCoLLC101.640.00.077.0167.9-197.30.022.938.197.20.032.8-4.4-17.10.049.040.753.00.025.716.520.50.0-108.3-29.422.30.0-24.170.67.80.017.7-11.116.80.015.2-7.927.80.00.00.00.00.00.00.00.0

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

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value551-282.06687867948595711026441282-31.0947613702122513261.01206392871415310
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromRelatedParties0.00.00.078600.079400.08500.00.00.00.00.00.00.00.00.00.00.00.00.00.087100.041500.00.0

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest dei:LegalEntity

exc:AtlanticCityElectricCompany


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value36144.068-15.01410.0651410.0-1.06910.08.01465121212705.0-133.0
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest6.5-5.00.68.7-1.916.51.05.92.20.83.27.31.61.11.14.91200.01.03.18.01.2-42.9
Percentage of RevenueFromRelatedParties0.00.00.06800.0-1500.01400.00.00.00.00.00.00.00.00.00.00.00.00.00.07000.0500.00.0
Percentage of RevenueFromRelatedParties exc:AtlanticCityElectricCompany3600.01400.00.06800.0-1500.01400.00.06500.01400.01000.00.06900.01000.0800.00.00.01200.01200.00.07000.0500.0-13300.0

exc:BaltimoreGasAndElectricCompany


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value371969161172221196756196868164156143102762051689240167
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest6.7-69.513.67.82.1261.212.46.18.715.3-277.48.610.422.211.77.77600.017.042.910.69.653.9
Percentage of RevenueFromRelatedParties0.00.00.06100.01700.022200.00.00.00.00.00.00.00.00.00.00.00.00.00.09200.04000.00.0
Percentage of RevenueFromRelatedParties exc:BaltimoreGasAndElectricCompany528.63266.70.01016.7425.03700.00.01116.7933.33266.70.01350.01066.72600.00.03400.02533.34100.00.01314.31000.03340.0

exc:CommonwealthEdisonCo


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value238236169256-15.0204177245232197169245207211209320222233138112236192
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest43.2-83.725.332.6-1.9240.018.522.236.015.4-545.225.933.830.117.124.122200.019.335.212.956.961.9
Percentage of RevenueFromRelatedParties0.00.00.025600.0-1500.020400.00.00.00.00.00.00.00.00.00.00.00.00.00.011200.023600.00.0
Percentage of RevenueFromRelatedParties exc:CommonwealthEdisonCo4760.03933.30.01706.7-136.44080.00.06125.04640.04925.00.06125.04140.01507.10.010666.77400.04660.00.02800.07866.73840.0

exc:DelmarvaPowerandLightCompany


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value31612928-9.052373834603538313842503168116320-81.0
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest5.6-21.64.33.6-1.161.23.93.45.34.7-112.94.05.15.43.43.83100.05.62.87.24.8-26.1
Percentage of RevenueFromRelatedParties0.00.00.02800.0-900.05200.00.00.00.00.00.00.00.00.00.00.00.00.00.06300.02000.00.0
Percentage of RevenueFromRelatedParties exc:DelmarvaPowerandLightCompany1550.03050.00.0933.3-450.02600.00.03800.01700.03000.00.01900.01550.01900.00.02500.01550.03400.00.03150.01000.0-4050.0

exc:ExelonGenerationCoLLC


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value124-947.0304219860-547.0562501202652-435.0389209202703596-415.05468.04505.0411
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest22.5335.845.527.9108.3-643.558.745.531.450.91403.241.134.128.857.444.9-41500.045.32.051.71.2132.6
Percentage of RevenueFromRelatedParties0.00.00.021900.086000.0-54700.00.00.00.00.00.00.00.00.00.00.00.00.00.045000.0500.00.0
Percentage of RevenueFromRelatedParties exc:ExelonGenerationCoLLC48.8-321.00.066.2317.3-165.80.0182.280.2205.70.0126.376.650.80.0201.4-154.9165.50.089.61.4153.4

exc:PecoEnergyCo


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1061771071223215513215411519313512495111127140108163120176123167
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest19.2-62.816.015.54.0182.413.814.017.915.1-435.513.115.515.810.410.610800.013.530.620.229.653.9
Percentage of RevenueFromRelatedParties0.00.00.012200.03200.015500.00.00.00.00.00.00.00.00.00.00.00.00.00.017600.012300.00.0
Percentage of RevenueFromRelatedParties exc:PecoEnergyCo5300.08850.00.04066.71600.07750.00.015400.05750.019300.00.06200.04750.05550.00.07000.05400.016300.00.08800.06150.016700.0

exc:PepcoHoldingsLLC


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value138136782157.011978203112122691919974110236102131
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest25.0-48.211.727.40.9140.08.218.417.49.5-222.620.216.210.59.017.810200.010.9
Percentage of RevenueFromRelatedParties0.00.00.021500.0700.011900.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:PepcoHoldingsLLC3450.04533.30.03583.3233.33966.70.05075.03733.34066.70.06366.73300.01850.00.01966.7850.01091.7

exc:PotomacElectricPowerCompany


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value7265481213357331036657428761336512563582911472-133.0
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest13.1-23.07.215.44.267.13.49.310.24.4-135.59.210.04.75.39.46300.04.87.413.117.3-42.9
Percentage of RevenueFromRelatedParties0.00.00.012100.03300.05700.00.00.00.00.00.00.00.00.00.00.00.00.00.011400.07200.00.0
Percentage of RevenueFromRelatedParties exc:PotomacElectricPowerCompany7200.06500.00.04033.33300.05700.00.05150.06600.02850.00.04350.03050.01650.00.012500.06300.05800.00.011400.07200.0-13300.0

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest dei:LegalEntity, us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

exc:PepcoHoldingsLLC, us-gaap:CorporateNonSegment, us-gaap:CorporateAndOther


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-1.0-4.0-3.0-2.0-2.010665192106113621798564
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest-0.21.4-0.4-0.3-0.3124.76.817.416.58.8-200.018.913.99.1
Percentage of RevenueFromRelatedParties0.00.00.0-200.0-200.010600.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:PepcoHoldingsLLC us-gaap:CorporateNonSegment us-gaap:CorporateAndOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:CorporateNonSegment, us-gaap:CorporateAndOther


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-92.0-80.0-81.0-87.0-108.0-69.0-109.0-68.0-73.0-78.0-54.0-83.0-61.0-52.0
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest-16.728.4-12.1-11.1-13.6-81.2-11.4-6.2-11.3-6.1174.2-8.8-10.0-7.4
Percentage of RevenueFromRelatedParties0.00.00.0-8700.0-10800.0-6900.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:CorporateNonSegment us-gaap:CorporateAndOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:AtlanticCityElectricCompany


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value36144.068-15.01410.0651410.0-1.06910.08.0
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest6.5-5.00.68.7-1.916.51.05.92.20.83.27.31.61.1
Percentage of RevenueFromRelatedParties0.00.00.06800.0-1500.01400.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:AtlanticCityElectricCompany0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:BaltimoreGasAndElectricCompany


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value371969161172221196756196868164156
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest6.7-69.513.67.82.1261.212.46.18.715.3-277.48.610.422.2
Percentage of RevenueFromRelatedParties0.00.00.06100.01700.022200.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:BaltimoreGasAndElectricCompany0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:CommonwealthEdisonCo


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value238236169256-15.0204177245232197169245207211
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest43.2-83.725.332.6-1.9240.018.522.236.015.4-545.225.933.830.1
Percentage of RevenueFromRelatedParties0.00.00.025600.0-1500.020400.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:CommonwealthEdisonCo0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:DelmarvaPowerandLightCompany


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value31612928-9.0523738346035383138
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest5.6-21.64.33.6-1.161.23.93.45.34.7-112.94.05.15.4
Percentage of RevenueFromRelatedParties0.00.00.02800.0-900.05200.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:DelmarvaPowerandLightCompany0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:ExelonGenerationCoLLC


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value124-947.0304219860-547.0562501202652-435.0389209202
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest22.5335.845.527.9108.3-643.558.745.531.450.91403.241.134.128.8
Percentage of RevenueFromRelatedParties0.00.00.021900.086000.0-54700.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:ExelonGenerationCoLLC0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:PecoEnergyCo


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1061771071223215513215411519313512495111
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest19.2-62.816.015.54.0182.413.814.017.915.1-435.513.115.515.8
Percentage of RevenueFromRelatedParties0.00.00.012200.03200.015500.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:PecoEnergyCo0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:PepcoHoldingsLLC


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value138136782157.011978203112122691919974
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest25.0-48.211.727.40.9140.08.218.417.49.5-222.620.216.210.5
Percentage of RevenueFromRelatedParties0.00.00.021500.0700.011900.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:PepcoHoldingsLLC0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:PotomacElectricPowerCompany


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value726548121335733103665742876133
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest13.1-23.07.215.44.267.13.49.310.24.4-135.59.210.04.7
Percentage of RevenueFromRelatedParties0.00.00.012100.03300.05700.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:PotomacElectricPowerCompany0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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
Value74-19.0232216219-294.0148172144310261376659-720.0452-72.021513634010218426811532736320422277-54.031143923956182161126158423255332446367552176563
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 RevenueFromRelatedParties0.00.00.021600.021900.0-29400.00.00.00.00.00.00.00.00.00.00.00.00.00.034000.010200.00.00.05750.032700.036300.00.00.00.0-5400.00.021950.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense


Interest
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value380388398421404389403403397410387367365359377426363347506366277268243145335333247228217224228246617225240250189175176176175177169269177
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromRelatedParties0.00.039800.042100.040400.00.00.00.00.00.00.00.00.00.00.00.00.00.050600.036600.00.00.012150.014500.033500.00.00.00.021700.00.011400.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:InterestExpense dei:LegalEntity

exc:AtlanticCityElectricCompany


Interest
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value15141515141415151416161616151515151515161616161616
Percentage of InterestExpense3.93.63.83.63.53.63.73.73.53.94.14.44.44.24.03.54.14.33.04.45.86.06.611.04.8
Percentage of RevenueFromRelatedParties0.00.01500.01500.01400.00.00.00.00.00.00.00.00.00.00.00.00.00.01500.01600.00.00.0800.01600.01600.0
Percentage of RevenueFromRelatedParties exc:AtlanticCityElectricCompany1500.00.01500.01500.01400.00.01500.01500.01400.00.01600.01600.01600.00.00.01500.01500.00.01500.01600.01600.00.01600.01600.01600.0

exc:BaltimoreGasAndElectricCompany


Interest
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value3434343232323129292827252526242223232420202121202121222323122932333435344132323233
Percentage of InterestExpense8.98.88.57.67.98.27.77.27.36.87.06.86.87.26.45.26.36.64.75.57.27.88.613.86.36.38.910.110.65.412.713.05.315.114.613.621.718.318.218.218.9
Percentage of RevenueFromRelatedParties0.00.03400.03200.03200.00.00.00.00.00.00.00.00.00.00.00.00.00.02400.02000.00.00.01050.02000.02100.00.00.00.02300.00.01450.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:BaltimoreGasAndElectricCompany566.70.0566.7800.0533.30.0516.7483.3483.30.0450.0416.7416.70.0800.0733.3460.00.0342.9500.0400.00.0700.02000.0300.00.0733.31150.0143.80.01450.0800.0825.00.0875.01700.01366.70.00.00.00.0

exc:CommonwealthEdisonCo


Interest
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value939292959188878684838282868386988284194888381807881777876777371723507371717984828282837913081
Percentage of InterestExpense24.523.723.122.622.522.621.621.321.220.221.222.323.623.122.823.022.624.238.324.030.030.232.953.824.223.131.633.335.532.631.129.356.732.429.628.441.848.046.646.646.946.946.748.345.8
Percentage of RevenueFromRelatedParties0.00.09200.09500.09100.00.00.00.00.00.00.00.00.00.00.00.00.00.019400.08800.00.00.04000.07800.08100.00.00.00.07700.00.03550.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:CommonwealthEdisonCo1550.00.0613.3863.61820.00.02175.01720.02100.00.02050.01640.0614.30.02866.73266.71640.00.04850.02933.31660.00.08000.07800.08100.00.07800.00.07700.00.07100.00.035000.00.00.07100.07900.00.00.00.00.00.00.00.00.0

exc:DelmarvaPowerandLightCompany


Interest
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value15141515161615151516151413131313131312131213121312
Percentage of InterestExpense3.93.63.83.64.04.13.73.73.83.93.93.83.63.63.43.13.63.72.43.64.34.94.99.03.6
Percentage of RevenueFromRelatedParties0.00.01500.01500.01600.00.00.00.00.00.00.00.00.00.00.00.00.00.01200.01300.00.00.0600.01300.01200.0
Percentage of RevenueFromRelatedParties exc:DelmarvaPowerandLightCompany750.00.0500.0750.0800.00.01500.0750.0750.00.0750.0700.0650.00.0650.0650.0650.00.0600.0650.0600.00.01200.0650.0600.0

exc:ExelonGenerationCoLLC


Interest
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value6877727810084101107102118939391881031209082678987865690907977747341829382788585544237454544373735
Percentage of InterestExpense17.919.818.118.524.821.625.126.625.728.824.025.324.924.527.328.224.823.613.224.331.432.123.062.126.923.731.232.533.618.336.037.813.334.735.434.028.624.021.025.625.724.921.913.819.8
Percentage of RevenueFromRelatedParties0.00.07200.07800.010000.00.00.00.00.00.00.00.00.00.00.00.00.00.06700.08900.00.00.02800.09000.09000.00.00.00.07300.00.04100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:ExelonGenerationCoLLC23.10.021.828.830.30.036.742.532.20.030.234.122.90.034.844.827.30.013.324.932.50.027.258.842.70.068.836.821.90.021.426.420.90.018.020.214.60.00.00.00.00.00.00.00.0

exc:PecoEnergyCo


Interest
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value353636333333303030302828303128282828272828272525252526252526262526262928282931313130357442
Percentage of InterestExpense9.29.39.07.88.28.57.47.47.67.37.27.68.28.67.46.67.78.15.37.710.110.110.317.27.57.510.511.011.511.611.410.24.211.612.111.214.816.617.617.617.716.920.727.523.7
Percentage of RevenueFromRelatedParties0.00.03600.03300.03300.00.00.00.00.00.00.00.00.00.00.00.00.00.02700.02800.00.00.01250.02500.02500.00.00.00.02500.00.01300.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:PecoEnergyCo1750.00.01200.01650.01650.00.03000.01500.03000.00.01400.01400.01500.00.01400.01400.02800.00.01350.01400.02800.00.02500.00.00.00.00.00.02500.00.02600.00.00.00.02900.02800.02800.00.00.00.00.00.00.00.00.0

exc:PepcoHoldingsLLC


Interest
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value6767676767666667656865656362625962
Percentage of InterestExpense17.617.316.815.916.617.016.416.616.416.616.817.717.317.316.413.817.1
Percentage of RevenueFromRelatedParties0.00.06700.06700.06700.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:PepcoHoldingsLLC2233.30.01116.72233.32233.30.01650.02233.32166.70.02166.72166.71575.00.0516.7491.7516.7

exc:PotomacElectricPowerCompany


Interest
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value34353534343333343432323231323128292930313732313130
Percentage of InterestExpense8.99.08.88.18.48.58.28.48.67.88.38.78.58.98.26.68.08.45.98.513.411.912.821.49.0
Percentage of RevenueFromRelatedParties0.00.03500.03400.03400.00.00.00.00.00.00.00.00.00.00.00.00.00.03000.03100.00.00.01550.03100.03000.0
Percentage of RevenueFromRelatedParties exc:PotomacElectricPowerCompany3400.00.01166.73400.03400.00.01650.03400.01700.00.01600.01600.01550.00.03100.02800.02900.00.03000.03100.03700.00.03100.03100.03000.0

Net Income Loss

us-gaap:NetIncomeLoss dei:LegalEntity

us-gaap:NetIncomeLoss

exc:ExelonGenerationCoLLC


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value-61.0-793.0194947645397257108363-178.02341781362224305-250.0423-42.0236-8.031013787165166446386443495424605382561425657512528
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromRelatedParties0.00.00.04900.047600.04500.00.00.00.00.00.00.00.00.00.00.00.00.00.023600.0-800.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:ExelonGenerationCoLLC-24.0-268.80.014.8175.613.60.093.542.9114.50.076.065.234.20.0103.0-93.3128.20.047.0-2.2115.70.018.439.344.90.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss Attributable To Noncontrolling Interest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-30
Value7525766853-206.036-12.010.059-47.0673.05142-1.0
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromRelatedParties0.00.00.06800.05300.0-20600.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest dei:LegalEntity

exc:ExelonGenerationCoLLC


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value7424756853-206.036-13.010.059-47.0663.0505642-1.0
Percentage of NetIncomeLossAttributableToNoncontrollingInterest98.796.098.7100.0100.0100.0100.0108.3100.0100.0100.098.5100.098.00.0100.0100.0
Percentage of RevenueFromRelatedParties0.00.00.06800.05300.0-20600.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:ExelonGenerationCoLLC29.18.10.020.519.6-62.40.0-4.74.018.60.021.41.112.60.014.2-0.4

Net Income Loss Available To Common Stockholders Basic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value401-289.03595015215827737724849071527335395851871824809952044902671733096296386931999352290495738490-4.0378296286200606601620668
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromRelatedParties0.00.00.050100.052100.058200.00.00.00.00.00.00.00.00.00.00.00.00.00.049000.026700.00.00.031450.063800.069300.00.00.00.09000.00.036900.00.00.00.00.00.00.00.00.00.00.0

Nonoperating Income Expense

us-gaap:NonoperatingIncomeExpense

us-gaap:NonoperatingIncomeExpense


Nonoperating
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
Value185-161.039917229-1135.0-5.0-251.0-197.064-740.0-199.0-329.0-399.0-35.0-149.0-231.0-90.0-321.0-396.0-232.0-173.0-145.0-497.0-172.0-265.0-590.0965.0-124.0-84.0-79.0-269.0-451.0-138.0-145.0-299.0-1.0-34.0-325.0-82.0-88.0-49.031-397.0-90.0
Percentage of NonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromRelatedParties0.00.00.01700.022900.0-113500.00.00.00.00.00.00.00.00.00.00.00.00.00.0-39600.0-23200.00.00.0-24850.0-17200.0-26500.00.00.00.0-12400.00.0-3950.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NonoperatingIncomeExpense dei:LegalEntity

exc:AtlanticCityElectricCompany


Nonoperating
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
Value-14.0-14.0-13.0-14.0-13.0-13.0-13.0-14.0-14.0-11.0-16.0-15.0-15.0-15.0-14.0-14.0-13.0-13.0-14.0-13.0-14.0-12.0-17.0-15.0-15.0-15.0
Percentage of NonoperatingIncomeExpense-7.68.7-3.3-82.4-5.71.1260.05.67.1-17.22.27.54.63.840.09.45.614.44.43.36.06.911.73.08.75.7
Percentage of RevenueFromRelatedParties0.00.00.0-1400.0-1300.0-1300.00.00.00.00.00.00.00.00.00.00.00.00.00.0-1300.0-1400.00.00.0-750.0-1500.0-1500.0
Percentage of RevenueFromRelatedParties exc:AtlanticCityElectricCompany-1400.0-1400.00.0-1400.0-1300.0-1300.00.0-1400.0-1400.0-1100.00.0-1500.0-1500.0-1500.00.00.0-1300.0-1300.00.0-1300.0-1400.0-1200.00.0-1500.0-1500.0-1500.0

exc:BaltimoreGasAndElectricCompany


Nonoperating
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
Value-25.0-26.0-28.0-28.0-26.0-27.0-22.0-24.0-24.0-24.0-23.0-22.0-21.0-21.0-21.0-22.0-22.0-23.0-22.0-23.0-19.0-20.0-21.0-21.0-20.0-21.0-21.0-22.0-22.0-23.0-24.0-25.0-28.0-28.0-29.0-30.0-27.0-35.0-28.0-24.0-26.0-25.0
Percentage of NonoperatingIncomeExpense-13.516.1-7.0-164.7-11.42.4440.09.612.2-37.53.111.16.45.360.014.89.525.66.95.88.211.614.54.211.67.93.6-22.9-440.018.528.631.610.46.221.020.79.03500.082.47.431.728.4
Percentage of RevenueFromRelatedParties0.00.00.0-2800.0-2600.0-2700.00.00.00.00.00.00.00.00.00.00.00.00.00.0-2300.0-1900.00.00.0-1050.0-2000.0-2100.00.00.00.0-2300.00.0-1250.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:BaltimoreGasAndElectricCompany-357.1-433.30.0-466.7-650.0-450.00.0-400.0-400.0-400.00.0-366.7-350.0-350.00.0-733.3-733.3-460.00.0-328.6-475.0-400.00.0-700.0-2000.0-300.00.0-733.3-1100.0-143.80.0-1250.0-700.0-700.00.0-750.0-1350.0-1166.70.00.00.00.0

exc:CommonwealthEdisonCo


Nonoperating
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-83.0-89.0-84.0-85.0-87.0-84.0-79.0-83.0-79.0-79.0-74.0-78.0-81.0-81.0-78.0-84.0-97.0-81.0-80.0-277.0-88.0-82.0-77.0-79.0-76.0-81.0-77.0-77.0-75.0-75.0-68.0-67.0-70.0-348.0-50.0-69.0-71.0-78.0-83.0-70.0-82.0-81.0-76.0-79.0-126.0-81.0
Percentage of NonoperatingIncomeExpense-44.955.3-21.1-500.0-38.07.41580.033.140.1-123.410.039.224.620.3222.956.442.090.024.969.937.947.453.115.944.230.613.1-80.2-1500.060.581.084.826.077.236.247.623.77800.0244.121.5100.092.0155.1-254.831.790.0
Percentage of RevenueFromRelatedParties0.00.00.0-8500.0-8700.0-8400.00.00.00.00.00.00.00.00.00.00.00.00.00.0-27700.0-8800.00.00.0-3950.0-7600.0-8100.00.00.00.0-7500.00.0-3350.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:CommonwealthEdisonCo-1660.0-1483.30.0-566.7-790.9-1680.00.0-2075.0-1580.0-1975.00.0-1950.0-1620.0-578.60.0-2800.0-3233.3-1620.00.0-6925.0-2933.3-1640.00.0-7900.0-7600.0-8100.00.0-7700.00.0-7500.00.0-6700.00.0-34800.00.00.0-7100.0-7800.00.00.00.00.00.00.00.00.0

exc:DelmarvaPowerandLightCompany


Nonoperating
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
Value-12.0-12.0-11.0-13.0-13.0-14.0-13.0-13.0-10.0-12.0-13.0-13.0-11.0-11.0-9.0-9.0-10.0-10.0-9.0-9.0-10.0-9.0-11.0-8.0-11.0-10.0
Percentage of NonoperatingIncomeExpense-6.57.5-2.8-76.5-5.71.2260.05.25.1-18.81.86.53.32.825.76.04.311.12.82.34.35.27.61.66.43.8
Percentage of RevenueFromRelatedParties0.00.00.0-1300.0-1300.0-1400.00.00.00.00.00.00.00.00.00.00.00.00.00.0-900.0-1000.00.00.0-400.0-1100.0-1000.0
Percentage of RevenueFromRelatedParties exc:DelmarvaPowerandLightCompany-600.0-600.00.0-433.3-650.0-700.00.0-1300.0-500.0-600.00.0-650.0-550.0-550.00.0-450.0-500.0-500.00.0-450.0-500.0-450.00.0-800.0-550.0-500.0

exc:ExelonGenerationCoLLC


Nonoperating
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
Value43295658287515-880.02011955319-469.078-73.0-145.02029652159-85.010818-4.037-325.0-130.0-8.0-350.02531425.03952-126.046-24.0-2.0-161.012491-201.0313075155-170.044
Percentage of NonoperatingIncomeExpense233.5-59.0164.91688.2224.977.5-4020.0-7.6-27.9498.463.4-39.222.236.3-577.1-64.4-22.5-176.726.5-27.3-7.82.3-25.565.475.63.059.3263.52840.0-4.0-46.4-65.846.8-10.217.41.453.8-12400.0-267.661.8-37.8-34.1-153.1500.042.8-48.9
Percentage of RevenueFromRelatedParties0.00.00.028700.051500.0-88000.00.00.00.00.00.00.00.00.00.00.00.00.00.010800.01800.00.00.0-16250.0-13000.0-800.00.00.00.0500.00.02600.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:ExelonGenerationCoLLC170.132.20.086.7190.0-266.70.06.921.8100.60.025.3-26.7-36.40.032.419.448.20.021.55.0-1.50.0-157.8-85.0-3.80.0225.970.61.50.013.5-35.811.70.0-0.4-38.333.50.00.00.00.00.00.00.00.0

exc:PecoEnergyCo


Nonoperating
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-35.0-33.0-33.0-33.0-31.0-33.0-31.0-29.0-30.0-29.0-29.0-30.0-32.0-31.0-30.0-29.0-29.0-29.0-29.0-28.0-29.0-29.0-28.0-27.0-27.0-26.0-26.0-27.0-27.0-26.0-27.0-28.0-28.0-26.0-27.0-30.0-29.0-29.0-29.0-31.0-31.0-28.0-31.0-35.0-78.0-41.0
Percentage of NonoperatingIncomeExpense-18.920.5-8.3-194.1-13.52.9620.011.615.2-45.33.915.19.77.885.719.512.632.29.07.112.516.819.35.415.79.84.4-28.1-540.021.032.135.410.45.819.620.79.72900.085.39.537.831.863.3-112.919.645.6
Percentage of RevenueFromRelatedParties0.00.00.0-3300.0-3100.0-3300.00.00.00.00.00.00.00.00.00.00.00.00.00.0-2800.0-2900.00.00.0-1350.0-2700.0-2600.00.00.00.0-2600.00.0-1400.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:PecoEnergyCo-1750.0-1650.00.0-1100.0-1550.0-1650.00.0-2900.0-1500.0-2900.00.0-1500.0-1600.0-1550.00.0-1450.0-1450.0-2900.00.0-1400.0-1450.0-2900.00.0-2700.00.00.00.00.00.0-2600.00.0-2800.00.00.00.0-3000.0-2900.0-2900.00.00.00.00.00.00.00.00.0

exc:PepcoHoldingsLLC


Nonoperating
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-47.0-50.0-52.0-51.0-53.0-54.0-50.0-53.0-53.0-53.0-58.0-54.0-54.0-52.0-48.0-49.0-46.0-49.0
Percentage of NonoperatingIncomeExpense-25.431.1-13.0-300.0-23.14.81000.021.126.9-82.87.827.116.413.0137.132.919.954.4
Percentage of RevenueFromRelatedParties0.00.00.0-5100.0-5300.0-5400.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:PepcoHoldingsLLC-1175.0-1666.70.0-850.0-1766.7-1800.00.0-1325.0-1766.7-1766.70.0-1800.0-1800.0-1300.00.0-408.3-383.3-408.3

exc:PotomacElectricPowerCompany


Nonoperating
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
Value-22.0-22.0-25.0-25.0-25.0-25.0-24.0-24.0-27.0-27.0-24.0-25.0-24.0-23.0-22.0-24.0-21.0-21.0-21.0-18.0-25.0-28.0-25.0-23.0-23.0-25.0
Percentage of NonoperatingIncomeExpense-11.913.7-6.3-147.1-10.92.2480.09.613.7-42.23.212.67.35.862.916.19.123.36.54.510.816.217.24.613.49.4
Percentage of RevenueFromRelatedParties0.00.00.0-2500.0-2500.0-2500.00.00.00.00.00.00.00.00.00.00.00.00.00.0-1800.0-2500.00.00.0-1150.0-2300.0-2500.0
Percentage of RevenueFromRelatedParties exc:PotomacElectricPowerCompany-2200.0-2200.00.0-833.3-2500.0-2500.00.0-1200.0-2700.0-1350.00.0-1250.0-1200.0-1150.00.0-2400.0-2100.0-2100.00.0-1800.0-2500.0-2800.00.0-2300.0-2300.0-2500.0

Operating Expenses

us-gaap:OperatingExpenses

us-gaap:OperatingExpenses


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value756110082785380876769752973937559688182628107825271388648
Percentage of OperatingExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromRelatedParties0.00.00.0808700.0676900.0752900.00.00.00.00.00.00.00.00.0

us-gaap:OperatingExpenses dei:LegalEntity, us-gaap:ConsolidationItems

exc:PepcoHoldingsLLC, us-gaap:IntersegmentElimination


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-95.0-96.0-94.0-91.0-98.0-90.0-98.0-94.0-101.0-105.0-111.0-104.0-112.0-112.0
Percentage of OperatingExpenses-1.3-1.0-1.2-1.1-1.4-1.2-1.3-1.2-1.5-1.3-1.4-1.3-1.6-1.3
Percentage of RevenueFromRelatedParties0.00.00.0-9100.0-9800.0-9000.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:PepcoHoldingsLLC us-gaap:IntersegmentElimination100.0100.00.0100.0100.096.80.0101.1102.099.10.099.0102.899.1

us-gaap:OperatingExpenses dei:LegalEntity, us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

exc:PepcoHoldingsLLC, us-gaap:CorporateNonSegment, us-gaap:CorporateAndOther


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value97979494979310195100108113105110114
Percentage of OperatingExpenses1.31.01.21.21.41.21.41.31.51.31.41.31.51.3
Percentage of RevenueFromRelatedParties0.00.00.09400.09700.09300.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:PepcoHoldingsLLC us-gaap:CorporateNonSegment us-gaap:CorporateAndOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingExpenses dei:LegalEntity, us-gaap:PublicUtility

exc:ExelonGenerationCoLLC, exc:GenerationNewEngland


Operating
Period End2020-12-31
Value-21.0
Percentage of OperatingExpenses-0.3
Percentage of RevenueFromRelatedParties0.0
Percentage of RevenueFromRelatedParties exc:ExelonGenerationCoLLC exc:GenerationNewEngland0.0

us-gaap:OperatingExpenses us-gaap:ConsolidationItems

us-gaap:IntersegmentElimination


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-768.0-781.0-873.0-833.0-748.0-816.0-863.0-759.0-744.0-783.0-874.0-790.0-790.0-886.0
Percentage of OperatingExpenses-10.2-7.7-11.1-10.3-11.1-10.8-11.7-10.0-10.8-9.5-10.8-9.6-11.1-10.2
Percentage of RevenueFromRelatedParties0.00.00.0-83300.0-74800.0-81600.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:IntersegmentElimination96.797.70.098.698.499.00.099.399.299.70.0101.4101.8101.1

us-gaap:OperatingExpenses us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:CorporateNonSegment, us-gaap:CorporateAndOther


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value537492595489478481591457484459534459492444
Percentage of OperatingExpenses7.14.97.66.07.16.48.06.07.05.66.65.66.95.1
Percentage of RevenueFromRelatedParties0.00.00.048900.047800.048100.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:CorporateNonSegment us-gaap:CorporateAndOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:AtlanticCityElectricCompany


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value269282276338258251251340246252240322240287
Percentage of OperatingExpenses3.62.83.54.23.83.33.44.53.63.13.03.93.43.3
Percentage of RevenueFromRelatedParties0.00.00.033800.025800.025100.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:AtlanticCityElectricCompany0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:BaltimoreGasAndElectricCompany


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value620752695642573688638612569756691628578800
Percentage of OperatingExpenses8.27.58.97.98.59.18.68.18.39.28.57.68.19.3
Percentage of RevenueFromRelatedParties0.00.00.064200.057300.068800.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:BaltimoreGasAndElectricCompany0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:CommonwealthEdisonCo


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value11961210115213021345115111491256104011351131127511111223
Percentage of OperatingExpenses15.812.014.716.119.915.315.516.615.113.714.015.515.614.1
Percentage of RevenueFromRelatedParties0.00.00.0130200.0134500.0115100.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:CommonwealthEdisonCo0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:DelmarvaPowerandLightCompany


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value255309277296263284269268243308284277247335
Percentage of OperatingExpenses3.43.13.53.73.93.83.63.53.53.73.53.43.53.9
Percentage of RevenueFromRelatedParties0.00.00.029600.026300.028400.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:DelmarvaPowerandLightCompany0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:ExelonGenerationCoLLC


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value44696672468447273547440042954274409649635035496142985218
Percentage of OperatingExpenses59.166.259.658.552.458.458.156.559.560.162.160.160.260.3
Percentage of RevenueFromRelatedParties0.00.00.0472700.0354700.0440000.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:ExelonGenerationCoLLC0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:PecoEnergyCo


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value552679612658618625605595510678599603526724
Percentage of OperatingExpenses7.36.77.88.19.18.38.27.97.48.27.47.37.48.4
Percentage of RevenueFromRelatedParties0.00.00.065800.061800.062500.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:PecoEnergyCo0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:PepcoHoldingsLLC


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value9551058988110295610009781124926105499111169231125
Percentage of OperatingExpenses12.610.512.613.614.113.313.214.913.512.812.213.512.913.0
Percentage of RevenueFromRelatedParties0.00.00.0110200.095600.0100000.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:PepcoHoldingsLLC0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:PotomacElectricPowerCompany


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value429466435465436462455515438491465516438501
Percentage of OperatingExpenses5.74.65.55.76.46.16.26.86.45.95.76.36.15.8
Percentage of RevenueFromRelatedParties0.00.00.046500.043600.046200.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:PotomacElectricPowerCompany0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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
Value366-121.026976956512209621353841121870811469421101125814752321296714126764748370712001134136670514008291638891254100550870460371435910621181103412029391367101814021076140310161255
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 RevenueFromRelatedParties0.00.00.076900.056500.0122000.00.00.00.00.00.00.00.00.00.00.00.00.00.0126700.064700.00.00.060000.0113400.0136600.00.00.00.016300.00.062700.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingIncomeLoss dei:LegalEntity

exc:AtlanticCityElectricCompany


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value50281782-2.027237928211484252328792525268319-121.029512529
Percentage of OperatingIncomeLoss13.7-23.16.310.7-0.42.22.45.83.31.72.07.32.72.12.25.410.81.93.66.62.9-25.14.14.22.22.1
Percentage of RevenueFromRelatedParties0.00.00.08200.0-200.02700.00.00.00.00.00.00.00.00.00.00.00.00.00.08300.01900.00.00.02550.02500.02900.0
Percentage of RevenueFromRelatedParties exc:AtlanticCityElectricCompany5000.02800.00.08200.0-200.02700.00.07900.02800.02100.00.08400.02500.02300.00.00.02500.02500.00.08300.01900.0-12100.00.05100.02500.02900.0

exc:BaltimoreGasAndElectricCompany


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value6222211989432491429180220109103851771631249822819011559187144110992041131025516910111469163613052-11.0842354153
Percentage of OperatingIncomeLoss16.9-183.544.211.67.620.414.86.79.518.115.49.09.016.113.08.442.217.626.69.19.138.720.49.28.714.916.07.36.6103.711.49.16.932.18.75.07.3-3.17.91.95.212.7
Percentage of RevenueFromRelatedParties0.00.00.08900.04300.024900.00.00.00.00.00.00.00.00.00.00.00.00.00.011500.05900.00.00.05500.09900.020400.00.00.00.016900.00.05700.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:BaltimoreGasAndElectricCompany885.73700.00.01483.31075.04150.00.01516.71333.33666.70.01716.71416.72950.00.04133.33266.74560.00.01642.91475.03740.00.03666.79900.02914.30.03400.02750.01056.20.05700.01725.04075.00.0750.02600.0-366.70.00.00.00.0

exc:CommonwealthEdisonCo


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
Value32132525334172288255328311276242323288292286404319314217389324274217327243230197287258238236278232209300218142226285243254200229280256291224203209206
Percentage of OperatingIncomeLoss87.7-268.694.144.312.723.626.524.237.022.734.228.230.626.522.727.4137.524.230.430.750.156.730.727.221.416.827.920.531.1146.026.522.223.141.142.636.219.963.026.820.624.616.624.420.525.120.820.814.520.616.4
Percentage of RevenueFromRelatedParties0.00.00.034100.07200.028800.00.00.00.00.00.00.00.00.00.00.00.00.00.038900.032400.00.00.016350.024300.023000.00.00.00.023800.00.013900.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:CommonwealthEdisonCo6420.05416.70.02273.3654.55760.00.08200.06220.06900.00.08075.05760.02085.70.013466.710633.36280.00.09725.010800.05480.00.032700.024300.023000.00.028700.00.023800.00.027800.00.020900.00.00.014200.022600.00.00.00.00.00.00.00.00.00.00.00.00.0

exc:DelmarvaPowerandLightCompany


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value437340414.066505144724851424952594178207230-72.046322463
Percentage of OperatingIncomeLoss11.7-60.314.95.30.75.45.23.85.25.96.84.54.54.54.14.017.76.02.85.74.6-14.96.52.72.14.6
Percentage of RevenueFromRelatedParties0.00.00.04100.0400.06600.00.00.00.00.00.00.00.00.00.00.00.00.00.07200.03000.00.00.01600.02400.06300.0
Percentage of RevenueFromRelatedParties exc:DelmarvaPowerandLightCompany2150.03650.00.01366.7200.03300.00.05100.02200.03600.00.02550.02100.02450.00.02950.02050.03900.00.03600.01500.0-3600.00.03200.01200.03150.0

exc:ExelonGenerationCoLLC


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
Value-308.0-1042.0-354.0-68.034533336248214733335311282347501500-467.038794342-13.0415230622703719249887429-389.0405721603-64.02901743842726737546478016608835879167111046676862
Percentage of OperatingIncomeLoss-84.2861.2-131.6-8.861.127.337.635.617.527.34.927.129.931.539.833.9-201.329.913.227.0-2.085.932.551.862.052.635.363.451.7-238.745.657.560.0-12.641.228.953.875.863.463.862.666.670.364.657.765.366.174.666.568.7
Percentage of RevenueFromRelatedParties0.00.00.0-6800.034500.033300.00.00.00.00.00.00.00.00.00.00.00.00.00.034200.0-1300.00.00.031100.070300.071900.00.00.00.0-38900.00.036050.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:ExelonGenerationCoLLC-121.3-353.20.0-20.5127.3100.90.0175.358.3105.00.0101.0103.387.20.0168.9-174.3117.30.068.1-3.6154.90.0301.9459.5340.80.0792.0213.4-116.50.0187.8171.3-16.30.036.891.473.50.00.00.00.00.00.00.00.00.00.00.00.0

exc:PecoEnergyCo


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
Value1412101401556318816218314522216515412714215716913719215020415219612815412422315513313414917015513820311717815117713115316121070215182194160172154210
Percentage of OperatingIncomeLoss38.5-173.652.020.211.215.416.813.517.218.223.313.413.512.912.511.559.114.821.016.123.540.618.112.810.916.322.09.516.291.419.112.413.740.016.629.521.149.312.313.015.617.57.515.717.913.814.912.315.216.7
Percentage of RevenueFromRelatedParties0.00.00.015500.06300.018800.00.00.00.00.00.00.00.00.00.00.00.00.00.020400.015200.00.00.07700.012400.022300.00.00.00.014900.00.07750.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:PecoEnergyCo7050.010500.00.05166.73150.09400.00.018300.07250.022200.00.07700.06350.07100.00.08450.06850.019200.00.010200.07600.019600.00.015400.00.00.00.00.00.014900.00.015500.00.00.00.017800.015100.017700.00.00.00.00.00.00.00.00.00.00.00.00.0

exc:PepcoHoldingsLLC


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value18518613026660173128256165175126245153126159285148180
Percentage of OperatingIncomeLoss50.5-153.748.334.610.614.213.318.919.614.417.821.416.211.412.619.363.813.9
Percentage of RevenueFromRelatedParties0.00.00.026600.06000.017300.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:PepcoHoldingsLLC4625.06200.00.04433.32000.05766.70.06400.05500.05833.30.08166.75100.03150.00.02375.01233.31500.0

exc:PotomacElectricPowerCompany


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value94877314658825712793846511285568714984795113297-105.01231158363
Percentage of OperatingIncomeLoss25.7-71.927.119.010.36.75.99.411.16.99.29.89.05.16.910.136.26.17.110.415.0-21.717.49.67.34.6
Percentage of RevenueFromRelatedParties0.00.00.014600.05800.08200.00.00.00.00.00.00.00.00.00.00.00.00.00.013200.09700.00.00.05750.08300.06300.0
Percentage of RevenueFromRelatedParties exc:PotomacElectricPowerCompany9400.08700.00.04866.75800.08200.00.06350.09300.04200.00.05600.04250.02800.00.014900.08400.07900.00.013200.09700.0-10500.00.011500.08300.06300.0

Other Comprehensive Income Loss Net Of Tax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value5754-296.0284121-231.03021-18.0-127.05244721024435-12.0-132.0363128-28.0325011-767.0-11.01314.0621120.094-362.0-92.0-114.0251
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0
Percentage of RevenueFromRelatedParties0.00.00.02800.04100.02100.00.00.00.00.00.00.00.00.00.00.00.00.00.03600.03100.00.00.01600.05000.01100.00.00.00.0400.00.0600.00.00.00.00.00.00.0

us-gaap:OtherComprehensiveIncomeLossNetOfTax dei:LegalEntity

exc:ExelonGenerationCoLLC


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value2.01.06.03.02.0-9.04.03.0-1.01.0-8.02.02.07.0-1.04.01.0117.04.00.0-1.0-3.0-13.06.0-17.0-47.0-26.0-155.0-21.0-29.0-32.0-134.0-104.0-239.0-152.0-263.0252
Percentage of OtherComprehensiveIncomeLossNetOfTax3.51.9-2.010.74.9-42.9-1.710.0-4.8-5.66.33.84.59.7-1.09.12.9-91.7-5.311.10.0-3.610.7-40.612.0-154.56.1236.4-118.3-525.0-4.7-266.70.0-110.666.0165.2230.7100.4
Percentage of RevenueFromRelatedParties0.00.00.0300.0200.0-900.00.00.00.00.00.00.00.00.00.00.00.00.00.0400.00.00.00.0-650.0600.0-1700.00.00.00.0-2100.00.0-1600.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:ExelonGenerationCoLLC0.80.30.00.90.7-2.70.01.1-0.40.30.00.60.71.80.01.40.43.30.00.80.0-0.40.0-6.33.9-8.10.0-23.2-77.1-6.30.0-8.3-38.1-26.50.0-32.1-62.668.1

us-gaap:OtherComprehensiveIncomeLossNetOfTax dei:LegalEntity, us-gaap:StatementEquityComponents

exc:ExelonGenerationCoLLC, us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value2.01.03.02.0-9.00.02.0-7.02.01.06.0-1.04.01.0132.09.0-1.0-1.0-40.0-21.0-29.0-32.0-134.0-104.0
Percentage of OtherComprehensiveIncomeLossNetOfTax3.51.910.74.9-42.90.0-11.15.53.82.38.3-1.09.12.9-108.3-1.525.0-3.2-3.6-30.5-525.0-4.7-266.70.0-110.6
Percentage of RevenueFromRelatedParties0.00.0300.0200.0-900.00.00.00.00.00.00.00.00.00.00.00.0900.0-100.00.00.0-2100.00.0-1600.00.00.0
Percentage of RevenueFromRelatedParties exc:ExelonGenerationCoLLC us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


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
Value5553-302.0263930-235.02721-18.0-120.05046621013835-23.0-147.0353433-26.0434117-711.019290226474262126
Percentage of OtherComprehensiveIncomeLossNetOfTax96.598.1102.092.995.1142.9101.790.0100.0100.094.596.2104.586.199.086.4100.0191.7111.497.2109.7117.992.9134.482.0154.592.7-172.7221.4550.0104.2350.00.0134.0
Percentage of RevenueFromRelatedParties0.00.00.02600.03900.03000.00.00.00.00.00.00.00.00.00.00.00.00.00.03500.03400.00.00.02150.04100.01700.00.00.00.02200.00.02100.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Other
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-1.0-1.00.0-1.00.00.00.00.00.00.04.08.0-2.00.0-1.06.06.03.00.0-7.05.0-5.03.06.0-56.0-19.0-48.0-25.0-79.0-46.0-65.0-58.0
Percentage of OtherComprehensiveIncomeLossNetOfTax0.3-3.60.0-4.8-0.00.00.0-0.0-0.00.09.111.1-2.00.0-2.9-50.0-4.58.30.0-25.0-17.9-15.66.054.57.3172.7-36.6-625.0-12.7-383.30.0-61.7
Percentage of RevenueFromRelatedParties0.0-100.00.0-100.00.00.00.00.00.00.00.00.00.00.00.00.00.0300.00.00.00.0-250.0300.0600.00.00.00.0-2500.00.0-2300.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312013-06-302013-03-31
Value5754-296.0284121-231.02722-17.0-126.05244711024437-10.0-137.04231280.094
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.090.0104.894.499.2100.0100.098.6100.0100.0105.783.3103.8116.7100.0100.00.0100.0
Percentage of RevenueFromRelatedParties0.00.00.02800.04100.02100.00.00.00.00.00.00.00.00.00.00.00.00.00.04200.03100.00.00.00.0
Percentage of RevenueFromRelatedParties 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

us-gaap:AccumulatedTranslationAdjustment


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
Value2.01.07.03.02.0-8.04.0-2.02.02.0-6.02.0-7.01.00.04.02.01.02.02.00.06.0-4.0-8.03.0-12.0-3.0-5.04.0-5.0-5.01.0-5.0-1.0
Percentage of OtherComprehensiveIncomeLossNetOfTax3.51.9-2.410.74.9-38.1-1.7-6.79.5-11.14.73.8-15.91.40.09.15.7-8.3-1.55.60.021.414.3-25.06.0-109.10.445.53.1-125.0-0.88.30.0-1.1
Percentage of RevenueFromRelatedParties0.00.00.0300.0200.0-800.00.00.00.00.00.00.00.00.00.00.00.00.00.0200.00.00.00.0-400.0300.0-1200.00.00.00.0-500.00.050.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OtherComprehensiveIncome


Other
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value2841212721-18.0524572
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.090.0100.0100.0100.0102.3100.0
Percentage of RevenueFromRelatedParties2800.04100.02100.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OtherComprehensiveIncome0.00.00.00.00.00.00.00.00.0

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
Value581225793421656-725.0390158212467-324.019444-28.033123720528336120144114133-244.0-17.080-247.0354243103162155-17.017293101-43.0194148-143.010093134206-122.093
Percentage of OtherNonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromRelatedParties0.00.00.042100.065600.0-72500.00.00.00.00.00.00.00.00.00.00.00.00.00.012000.014400.00.00.0-12200.0-1700.08000.00.00.00.010300.00.07750.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OtherNonoperatingIncomeExpense dei:LegalEntity

exc:AtlanticCityElectricCompany


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
Value1.01.01.01.02.02.01.01.01.03.00.01.01.01.01.01.02.02.01.02.02.04.0-1.01.01.01.0
Percentage of OtherNonoperatingIncomeExpense0.20.40.10.20.3-0.30.30.60.50.6-0.00.52.3-3.60.30.41.00.72.81.71.43.5-0.8-0.4-5.91.2
Percentage of RevenueFromRelatedParties0.00.00.0100.0200.0200.00.00.00.00.00.00.00.00.00.00.00.00.00.0200.0200.00.00.050.0100.0100.0
Percentage of RevenueFromRelatedParties exc:AtlanticCityElectricCompany100.0100.00.0100.0200.0200.00.0100.0100.0300.00.0100.0100.0100.00.00.0200.0200.00.0200.0200.0400.00.0100.0100.0100.0

exc:BaltimoreGasAndElectricCompany


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value9.08.06.06.06.05.010.07.05.05.05.05.04.04.04.04.04.04.05.05.05.04.05.04.04.04.04.04.05.04.04.04.04.05.05.05.07.06.04.08.06.08.0
Percentage of OtherNonoperatingIncomeExpense1.53.60.81.40.9-0.72.64.42.41.1-1.52.69.1-14.31.21.72.01.413.94.23.53.53.8-1.6-23.55.0-1.61.12.13.92.52.6-23.52.95.45.0-16.33.12.7-5.66.08.6
Percentage of RevenueFromRelatedParties0.00.00.0600.0600.0500.00.00.00.00.00.00.00.00.00.00.00.00.00.0500.0500.00.00.0200.0400.0400.00.00.00.0400.00.0200.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:BaltimoreGasAndElectricCompany128.6133.30.0100.0150.083.30.0116.783.383.30.083.366.766.70.0133.3133.380.00.071.4125.080.00.0133.3400.057.10.0133.3250.025.00.0200.0100.0125.00.0125.0350.0200.00.00.00.00.0

exc:CommonwealthEdisonCo


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
Value157.01110.01110.0128.010.08.0127.04.08.08.05.04.04.07.0-80.03.04.07.04.05.03.03.04.05.05.08.07.06.05.0275.03.04.05.0164.04.010.03.08.03.0
Percentage of OtherNonoperatingIncomeExpense2.63.11.42.41.7-1.43.15.14.71.7-3.73.69.1-28.62.42.12.01.419.4-66.72.13.55.3-1.6-29.43.8-1.21.12.14.94.94.5-35.32.929.05.0-7.02.13.4-11.24.04.37.51.5-6.63.2
Percentage of RevenueFromRelatedParties0.00.00.01000.01100.01000.00.00.00.00.00.00.00.00.00.00.00.00.00.0-8000.0300.00.00.0200.0500.0300.00.00.00.0500.00.0350.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:CommonwealthEdisonCo300.0116.70.066.7100.0200.00.0200.0200.0200.00.0175.080.057.10.0166.7133.380.00.0-2000.0100.080.00.0400.0500.0300.00.0400.00.0500.00.0700.00.0500.00.00.0300.0400.00.00.00.00.00.00.00.00.0

exc:DelmarvaPowerandLightCompany


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
Value4.03.03.02.02.02.03.02.05.03.03.02.03.02.04.04.03.03.04.03.03.03.02.04.02.02.0
Percentage of OtherNonoperatingIncomeExpense0.71.30.40.50.3-0.30.81.32.40.6-0.91.06.8-7.11.21.71.51.111.12.52.12.61.5-1.6-11.82.5
Percentage of RevenueFromRelatedParties0.00.00.0200.0200.0200.00.00.00.00.00.00.00.00.00.00.00.00.00.0300.0300.00.00.0200.0200.0200.0
Percentage of RevenueFromRelatedParties exc:DelmarvaPowerandLightCompany200.0150.00.066.7100.0100.00.0200.0250.0150.00.0100.0150.0100.00.0200.0150.0150.00.0150.0150.0150.00.0400.0100.0100.0

exc:ExelonGenerationCoLLC


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
Value508167738367602-771.0294128171430-342.017929-44.03002091812596.018511793133-257.0-31.094-255.034222890139134-33.01285483-76.0178134-164.07675119192-133.079
Percentage of OtherNonoperatingIncomeExpense87.474.293.187.291.8106.375.481.080.792.1105.692.365.9157.190.688.288.391.516.7154.281.281.6100.0105.3182.4117.5103.296.693.887.485.886.5194.174.458.182.2176.791.890.5114.776.080.688.893.2109.084.9
Percentage of RevenueFromRelatedParties0.00.00.036700.060200.0-77100.00.00.00.00.00.00.00.00.00.00.00.00.00.018500.011700.00.00.0-12850.0-3100.09400.00.00.00.09000.00.06700.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:ExelonGenerationCoLLC200.056.60.0110.9222.1-233.60.046.567.9135.60.058.110.6-11.10.070.667.578.50.036.932.734.70.0-124.8-20.344.50.0305.4113.426.90.034.9-9.432.70.017.5-18.148.10.00.00.00.00.00.00.00.0

exc:PecoEnergyCo


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
Value7.05.06.06.05.03.05.04.03.04.04.02.00.02.03.02.02.02.02.02.02.02.02.01.01.02.02.02.01.02.02.01.00.03.02.02.02.02.03.03.03.06.02.03.0-1.04.0
Percentage of OtherNonoperatingIncomeExpense1.22.20.81.40.8-0.41.32.51.40.9-1.21.00.0-7.10.90.81.00.75.61.71.41.81.5-0.4-5.92.5-0.80.60.41.91.20.6-0.01.72.22.0-4.71.02.0-2.13.06.51.51.50.84.3
Percentage of RevenueFromRelatedParties0.00.00.0600.0500.0300.00.00.00.00.00.00.00.00.00.00.00.00.00.0200.0200.00.00.050.0100.0200.00.00.00.0200.00.050.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:PecoEnergyCo350.0250.00.0200.0250.0150.00.0400.0150.0400.00.0100.00.0100.00.0100.0100.0200.00.0100.0100.0200.00.0100.00.00.00.00.00.0200.00.0100.00.00.00.0200.0200.0200.00.00.00.00.00.00.00.00.0

exc:PepcoHoldingsLLC


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value2017151614131613141210.011111114131313
Percentage of OtherNonoperatingIncomeExpense3.47.61.93.82.1-1.84.18.26.62.6-3.15.725.0-39.34.25.56.34.6
Percentage of RevenueFromRelatedParties0.00.00.01600.01400.01300.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:PepcoHoldingsLLC500.0566.70.0266.7466.7433.30.0325.0466.7400.00.0366.7366.7275.00.0108.3108.3108.3

exc:PotomacElectricPowerCompany


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
Value131210.010.09.09.09.09.07.07.08.07.08.08.010.07.07.08.08.0126.09.07.08.08.05.0
Percentage of OtherNonoperatingIncomeExpense2.25.31.32.41.4-1.22.35.73.31.5-2.53.618.2-28.63.03.03.42.822.210.04.27.95.3-3.3-47.16.2
Percentage of RevenueFromRelatedParties0.00.00.01000.0900.0900.00.00.00.00.00.00.00.00.00.00.00.00.00.01200.0600.00.00.0400.0800.0500.0
Percentage of RevenueFromRelatedParties exc:PotomacElectricPowerCompany1300.01200.00.0333.3900.0900.00.0450.0700.0350.00.0350.0400.0400.00.0700.0700.0800.00.01200.0600.0900.00.0800.0800.0500.0

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-03-312010-12-312010-09-30
Value476-264.0435569574376808760494966105800542636193886764981248526306123309587633738181074557934957364971.0378297289200606601669524845
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromRelatedParties0.00.00.056900.057400.037600.00.00.00.00.00.00.00.00.00.00.00.00.00.052600.030600.00.00.029350.063300.073800.00.00.00.09300.00.036800.00.00.00.00.00.00.00.00.00.00.00.0

Realized Investment Gains Losses

us-gaap:RealizedInvestmentGainsLosses dei:LegalEntity, us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByAssetClass

us-gaap:RealizedInvestmentGainsLosses

exc:CommonwealthEdisonCo, us-gaap:InterestRateSwap, us-gaap:Derivative


Realized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-30
Value-5.08.056-5.0-8.0-10.043-4.0-8.0-5.0-3.0-4.06.03.0-1.06.02.0
Percentage of RealizedInvestmentGainsLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromRelatedParties0.00.00.0-500.0-800.0-1000.00.00.00.00.00.00.00.00.00.00.0200.0
Percentage of RevenueFromRelatedParties exc:CommonwealthEdisonCo us-gaap:InterestRateSwap us-gaap:Derivative0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Regulated Operating Revenue

us-gaap:RegulatedOperatingRevenue

us-gaap:RegulatedOperatingRevenue


Regulated
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value12972-11.0-122.067-57.0-80.0-13.045034055445737974570394643133715419737934467367631002584283724343198
Percentage of RegulatedOperatingRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromRelatedParties0.00.0-1100.0-12200.06700.00.00.00.00.00.00.00.00.00.00.00.00.00.0446700.0367600.00.00.0141850.0243400.0319800.0

us-gaap:RegulatedOperatingRevenue dei:LegalEntity

exc:AtlanticCityElectricCompany


Regulated
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302017-03-31
Value118.05.0-26.01.00.01.0-2.01.00.0-1.0-1.00.00.00.00.0
Percentage of RegulatedOperatingRevenue8.511.1-45.521.31.5-0.0-1.215.40.00.0-0.0-0.00.00.00.00.0
Percentage of RevenueFromRelatedParties0.00.0500.0-2600.0100.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:AtlanticCityElectricCompany1100.00.0500.0-2600.0100.00.0100.0-200.0100.00.0-100.0-100.00.00.00.00.0

exc:BaltimoreGasAndElectricCompany


Regulated
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302017-03-31
Value1826-9.0-37.0361.0-5.06.010.0-3.0-6.0-4.00.00.00.00.0
Percentage of RegulatedOperatingRevenue14.036.181.830.353.7-1.86.2-46.20.2-0.1-0.1-0.10.00.00.00.0
Percentage of RevenueFromRelatedParties0.00.0-900.0-3700.03600.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:BaltimoreGasAndElectricCompany300.00.0-150.0-925.0600.00.0-83.3100.0166.70.0-100.0-66.70.00.00.00.0

exc:CommonwealthEdisonCo


Regulated
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302017-03-31
Value544.0-38.0-25.012-35.0-56.0-14.0-28.0-2.0-15.0-17.00.00.00.00.0
Percentage of RegulatedOperatingRevenue41.95.6345.520.517.961.470.0107.7-0.6-0.0-0.3-0.40.00.00.00.0
Percentage of RevenueFromRelatedParties0.00.0-3800.0-2500.01200.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:CommonwealthEdisonCo900.00.0-253.3-227.3240.00.0-1400.0-280.0-700.00.0-375.0-340.00.00.00.00.0

exc:DelmarvaPowerandLightCompany


Regulated
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302017-03-31
Value9.08.08.0-25.01.0-5.0-6.00.00.0-1.00.04.00.00.00.00.0
Percentage of RegulatedOperatingRevenue7.011.1-72.720.51.58.87.5-0.00.0-0.00.00.10.00.00.00.0
Percentage of RevenueFromRelatedParties0.00.0800.0-2500.0100.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:DelmarvaPowerandLightCompany450.00.0266.7-1250.050.00.0-600.00.00.00.00.0200.00.00.00.00.0

exc:PecoEnergyCo


Regulated
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302017-03-31
Value10.06.05.04.02.0-5.0-11.0-3.0-3.0-9.01.02.00.00.00.00.0
Percentage of RegulatedOperatingRevenue7.88.3-45.5-3.33.08.813.823.1-0.1-0.20.00.10.00.00.00.0
Percentage of RevenueFromRelatedParties0.00.0500.0400.0200.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:PecoEnergyCo500.00.0166.7200.0100.00.0-1100.0-150.0-300.00.050.0100.00.00.00.00.0

exc:PepcoHoldingsLLC


Regulated
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302017-03-31
Value463631-64.018-18.0-9.0-3.015-14.0-5.0-7.0330.00.00.0
Percentage of RegulatedOperatingRevenue35.750.0-281.852.526.931.611.223.10.3-0.3-0.1-0.20.80.00.00.0
Percentage of RevenueFromRelatedParties0.00.03100.0-6400.01800.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:PepcoHoldingsLLC1533.30.0516.7-2133.3600.00.0-225.0-100.0500.00.0-166.7-233.30.00.00.00.0

exc:PotomacElectricPowerCompany


Regulated
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302017-03-31
Value262018-13.015-13.0-3.0-1.014-13.0-4.0-10.00.00.00.00.0
Percentage of RegulatedOperatingRevenue20.227.8-163.610.722.422.83.87.70.3-0.3-0.1-0.30.00.00.00.0
Percentage of RevenueFromRelatedParties0.00.01800.0-1300.01500.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:PotomacElectricPowerCompany2600.00.0600.0-1300.01500.00.0-150.0-100.0700.00.0-200.0-500.00.00.00.00.0

Revenues

us-gaap:Revenues

us-gaap:Revenues


Revenues
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
Value79159890811488537322874783438929768994778814940380769693838187697623875778759002691075736702740165148830725569126024723761636502614160826284656559544686399152954587505244945291439844614116433941414722
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromRelatedParties0.00.00.0885300.0732200.0874700.00.00.00.00.00.00.00.00.00.00.00.00.00.0900200.0691000.00.00.0370050.0651400.0883000.00.00.00.0723700.00.0325100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Revenues dei:LegalEntity

exc:AtlanticCityElectricCompany


Revenuesdei:
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
Value319310293420256276274419274273254406265310271370270275275421270291291386285334
Percentage of Revenues4.03.13.64.73.53.23.34.73.62.92.94.33.33.23.24.23.53.13.54.73.93.84.35.24.43.8
Percentage of RevenueFromRelatedParties0.00.00.042000.025600.027600.00.00.00.00.00.00.00.00.00.00.00.00.00.042100.027000.00.00.019300.028500.033400.0
Percentage of RevenueFromRelatedParties exc:AtlanticCityElectricCompany31900.031000.00.042000.025600.027600.00.041900.027400.027300.00.040600.026500.031000.00.00.027000.027500.00.042100.027000.029100.00.038600.028500.033400.0

exc:BaltimoreGasAndElectricCompany


Revenuesdei:
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
Value68297481473161693777970364997679973166297781373867495181281268092974672562810367616976531054794737653880703720616696673745674976
Percentage of Revenues8.69.810.08.38.410.79.37.98.410.39.17.88.210.19.78.48.810.910.39.09.812.311.19.89.611.710.510.110.814.612.911.310.614.511.211.010.314.916.914.114.719.3
Percentage of RevenueFromRelatedParties0.00.00.073100.061600.093700.00.00.00.00.00.00.00.00.00.00.00.00.00.081200.068000.00.00.036250.062800.0103600.00.00.00.0105400.00.036850.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:BaltimoreGasAndElectricCompany9742.916233.30.012183.315400.015616.70.011716.710816.716266.70.012183.311033.316283.30.024600.022466.719020.00.011600.017000.018580.00.024166.762800.014800.00.023233.332650.06587.50.036850.016325.022000.00.018000.030800.023200.00.00.00.00.0

exc:CommonwealthEdisonCo


Revenuesdei:
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
Value15171535140516431417143914051583135114081373159813981512130915711357129812231497128612491196137611481185107912221128113410681156108011601290148412811388136217841444146613721918149914151357147513891553
Percentage of Revenues19.215.517.318.619.416.516.817.717.614.915.617.017.315.615.617.917.814.815.516.618.616.517.818.617.613.414.917.718.715.717.317.817.619.120.522.621.529.634.133.731.529.030.536.334.131.733.034.033.532.9
Percentage of RevenueFromRelatedParties0.00.00.0164300.0141700.0143900.00.00.00.00.00.00.00.00.00.00.00.00.00.0149700.0128600.00.00.068800.0114800.0118500.00.00.00.0113400.00.057800.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:CommonwealthEdisonCo30340.025583.30.010953.312881.828780.00.039575.027020.035200.00.039950.027960.010800.00.052366.745233.325960.00.037425.042866.724980.00.0137600.0114800.0118500.00.0122200.00.0113400.00.0115600.00.0116000.00.00.0128100.0138800.00.00.00.00.00.00.00.00.00.00.00.00.0

exc:DelmarvaPowerandLightCompany


Revenuesdei:
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
Value298382317337267350319319287380331328289384330327282362303331281362296314271421
Percentage of Revenues3.83.93.93.83.64.03.83.63.74.03.83.53.64.03.93.73.74.13.83.74.14.84.44.24.24.8
Percentage of RevenueFromRelatedParties0.00.00.033700.026700.035000.00.00.00.00.00.00.00.00.00.00.00.00.00.033100.028100.00.00.015700.027100.042100.0
Percentage of RevenueFromRelatedParties exc:DelmarvaPowerandLightCompany14900.019100.00.011233.313350.017500.00.031900.014350.019000.00.016400.014450.019200.00.016350.014100.018100.00.016550.014050.018100.00.031400.013550.021050.0

exc:ExelonGenerationCoLLC


Revenuesdei:
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
Value41535559433146593880473346444774421052965069527845795512465447514174488843885035358947394294476842325840480244123789439037724255407035333928401737532739216128622546273925962655235324212278244523782601
Percentage of Revenues52.556.253.452.653.054.155.753.554.855.957.556.156.756.955.554.254.855.855.755.951.962.664.164.465.066.166.263.862.960.761.265.466.358.162.561.263.058.554.154.155.554.257.850.253.554.355.356.357.455.1
Percentage of RevenueFromRelatedParties0.00.00.0465900.0388000.0473300.00.00.00.00.00.00.00.00.00.00.00.00.00.0503500.0358900.00.00.0238400.0423200.0584000.00.00.00.0439000.00.0212750.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:ExelonGenerationCoLLC1635.01884.40.01407.61431.71434.20.01736.01670.61670.70.01713.61677.31384.90.01605.11557.51481.20.01003.01002.51768.30.02314.62766.02767.80.03939.31885.11314.40.01108.11156.2901.30.0849.3893.6740.30.00.00.00.00.00.00.00.00.00.00.00.0

exc:PecoEnergyCo


Revenuesdei:
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
Value693889752813681813766778655900765757653866729715630796701788664841645740661985750693656993805728672895790806715875778946842115312991496126914551266132712041514
Percentage of Revenues8.89.09.39.29.39.39.28.78.59.58.78.18.18.98.78.28.39.18.98.89.611.19.610.010.111.210.310.010.913.713.111.210.914.712.612.312.018.719.517.918.422.828.928.328.932.630.830.629.132.1
Percentage of RevenueFromRelatedParties0.00.00.081300.068100.081300.00.00.00.00.00.00.00.00.00.00.00.00.00.078800.066400.00.00.037000.066100.098500.00.00.00.099300.00.036400.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:PecoEnergyCo34650.044450.00.027100.034050.040650.00.077800.032750.090000.00.037850.032650.043300.00.035750.031500.079600.00.039400.033200.084100.00.074000.00.00.00.00.00.099300.00.072800.00.00.00.080600.071500.087500.00.00.00.00.00.00.00.00.00.00.00.00.0

exc:PepcoHoldingsLLC


Revenuesdei:
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
Value114012441109136810161171110713801091122811171361107612511121131010741175
Percentage of Revenues14.412.613.715.513.913.413.315.514.213.012.714.513.312.913.414.914.113.4
Percentage of RevenueFromRelatedParties0.00.00.0136800.0101600.0117100.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:PepcoHoldingsLLC28500.041466.70.022800.033866.739033.30.034500.036366.740933.30.045366.735866.731275.00.010916.78950.09791.7

exc:PotomacElectricPowerCompany


Revenuesdei:
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
Value523553499611494544513642531575531628523557510604514530491635509551488592504545
Percentage of Revenues6.65.66.16.96.76.26.17.26.96.16.06.76.55.76.16.96.76.16.27.17.47.37.38.07.76.2
Percentage of RevenueFromRelatedParties0.00.00.061100.049400.054400.00.00.00.00.00.00.00.00.00.00.00.00.00.063500.050900.00.00.029600.050400.054500.0
Percentage of RevenueFromRelatedParties exc:PotomacElectricPowerCompany52300.055300.00.020366.749400.054400.00.032100.053100.028750.00.031400.026150.027850.00.060400.051400.053000.00.063500.050900.055100.00.059200.050400.054500.0

us-gaap:Revenues dei:LegalEntity, us-gaap:ConsolidationItems

exc:PepcoHoldingsLLC, us-gaap:IntersegmentElimination


Revenuesdei:
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-95.0-96.0-93.0-91.0-98.0-92.0-98.0-92.0-98.0-106.0-109.0-104.0-109.0-113.0-2.0-3.0-5.0-4.0
Percentage of Revenues-1.2-1.0-1.1-1.0-1.3-1.1-1.2-1.0-1.3-1.1-1.2-1.1-1.3-1.2-0.0-0.0-0.1-0.0
Percentage of RevenueFromRelatedParties0.00.00.0-9100.0-9800.0-9200.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:PepcoHoldingsLLC us-gaap:IntersegmentElimination100.0100.00.0100.0100.098.90.098.999.0100.00.099.0100.0100.00.075.0100.080.0

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

exc:PepcoHoldingsLLC, us-gaap:CorporateNonSegment, us-gaap:CorporateAndOther


Revenuesdei:
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
Value95959391979399929710610910310811315121312
Percentage of Revenues1.21.01.11.01.31.11.21.01.31.11.21.11.31.20.20.10.20.1
Percentage of RevenueFromRelatedParties0.00.00.09100.09700.09300.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:PepcoHoldingsLLC us-gaap:CorporateNonSegment us-gaap:CorporateAndOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Revenues dei:LegalEntity, us-gaap:PublicUtilityRegulatedOrUnregulatedStatus

exc:AtlanticCityElectricCompany, exc:OtherRegulatedRevenue


Revenuesdei:
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
Value12118.05.0-26.02.00.01.0-2.02.00.0-1.0-1.0-2.0-1.00.03.06.0
Percentage of Revenues0.20.10.10.1-0.40.00.00.0-0.00.00.0-0.0-0.0-0.0-0.00.00.00.1
Percentage of RevenueFromRelatedParties0.00.00.0500.0-2600.0200.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:AtlanticCityElectricCompany exc:OtherRegulatedRevenue0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

exc:AtlanticCityElectricCompany, us-gaap:RegulatedOperation


Revenuesdei:
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
Value307299285415282274274418276271255407266312272370267269
Percentage of Revenues3.93.03.54.73.93.13.34.73.62.92.94.33.33.23.24.23.53.1
Percentage of RevenueFromRelatedParties0.00.00.041500.028200.027400.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:AtlanticCityElectricCompany us-gaap:RegulatedOperation0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

exc:BaltimoreGasAndElectricCompany, exc:OtherRegulatedRevenue


Revenuesdei:
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-6.01829-9.0-36.0424.0-1.010.0161.0-1.0-1.0-7.025403540
Percentage of Revenues-0.10.20.4-0.1-0.50.50.0-0.00.10.20.0-0.0-0.0-0.10.30.50.50.5
Percentage of RevenueFromRelatedParties0.00.00.0-900.0-3600.04200.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:BaltimoreGasAndElectricCompany exc:OtherRegulatedRevenue0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

exc:BaltimoreGasAndElectricCompany, us-gaap:RegulatedOperation


Revenuesdei:
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
Value688956785740652895775704639960799732663984788698639911
Percentage of Revenues8.79.79.78.48.910.29.37.98.310.19.17.88.210.29.48.08.410.4
Percentage of RevenueFromRelatedParties0.00.00.074000.065200.089500.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:BaltimoreGasAndElectricCompany us-gaap:RegulatedOperation0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

exc:CommonwealthEdisonCo, exc:OtherRegulatedRevenue


Revenuesdei:
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
Value186212-35.0-25.018-31.0-50.0-9.0-24.05.0-8.0-10.0142.0242622
Percentage of Revenues0.20.60.1-0.4-0.30.2-0.4-0.6-0.1-0.30.1-0.1-0.10.10.00.30.30.3
Percentage of RevenueFromRelatedParties0.00.00.0-3500.0-2500.01800.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:CommonwealthEdisonCo exc:OtherRegulatedRevenue0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

exc:CommonwealthEdisonCo, us-gaap:RegulatedOperation


Revenuesdei:
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
Value149914731393167814421421143616331360143213691606140814981307154713311276
Percentage of Revenues18.914.917.219.019.716.217.218.317.715.115.517.117.415.515.617.617.514.6
Percentage of RevenueFromRelatedParties0.00.00.0167800.0144200.0142100.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:CommonwealthEdisonCo us-gaap:RegulatedOperation0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

exc:DelmarvaPowerandLightCompany, exc:OtherRegulatedRevenue


Revenuesdei:
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
Value10.09.08.08.0-25.02.0-5.0-6.01.02.00.01.06.01.0-2.00.01.010.0
Percentage of Revenues0.10.10.10.1-0.30.0-0.1-0.10.00.00.00.00.10.0-0.00.00.00.1
Percentage of RevenueFromRelatedParties0.00.00.0800.0-2500.0200.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:DelmarvaPowerandLightCompany exc:OtherRegulatedRevenue0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

exc:DelmarvaPowerandLightCompany, us-gaap:RegulatedOperation


Revenuesdei:
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
Value288373309329292348324325286378331327283383331327281352
Percentage of Revenues3.63.83.83.74.04.03.93.63.74.03.83.53.54.03.93.73.74.0
Percentage of RevenueFromRelatedParties0.00.00.032900.029200.034800.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:DelmarvaPowerandLightCompany us-gaap:RegulatedOperation0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

exc:PecoEnergyCo, exc:OtherRegulatedRevenue


Revenuesdei:
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
Value7.010.06.05.03.06.0-2.0-7.03.0-2.0-6.04.07.02.03.03.03.03.0
Percentage of Revenues0.10.10.10.10.00.1-0.0-0.10.0-0.0-0.10.00.10.00.00.00.00.0
Percentage of RevenueFromRelatedParties0.00.00.0500.0300.0600.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:PecoEnergyCo exc:OtherRegulatedRevenue0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

exc:PecoEnergyCo, us-gaap:RegulatedOperation


Revenuesdei:
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
Value686879746808678807769785652902769753646864726712627793
Percentage of Revenues8.78.99.29.19.39.29.28.88.59.58.78.08.08.98.78.18.29.1
Percentage of RevenueFromRelatedParties0.00.00.080800.067800.080700.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:PecoEnergyCo us-gaap:RegulatedOperation0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

exc:PepcoHoldingsLLC, exc:OtherRegulatedRevenue


Revenuesdei:
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
Value42463631-64.021-15.0-6.00.020-4.0-2.0-3.01914162243
Percentage of Revenues0.50.50.40.4-0.90.2-0.2-0.10.00.2-0.0-0.0-0.00.20.20.20.30.5
Percentage of RevenueFromRelatedParties0.00.00.03100.0-6400.02100.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:PepcoHoldingsLLC exc:OtherRegulatedRevenue0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0145.5200.00.0

exc:PepcoHoldingsLLC, us-gaap:RegulatedOperation


Revenuesdei:
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
Value109811981073133710801150112113861091120811211363107912321108129410521132
Percentage of Revenues13.912.113.215.114.813.113.415.514.212.712.714.513.412.713.214.813.812.9
Percentage of RevenueFromRelatedParties0.00.00.0133700.0108000.0115000.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:PepcoHoldingsLLC us-gaap:RegulatedOperation0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

exc:PotomacElectricPowerCompany, exc:OtherRegulatedRevenue


Revenuesdei:
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
Value20262018-13.016-11.0-1.01.016-4.0-2.0-8.0203.05.07.016
Percentage of Revenues0.30.30.20.2-0.20.2-0.1-0.00.00.2-0.0-0.0-0.10.20.00.10.10.2
Percentage of RevenueFromRelatedParties0.00.00.01800.0-1300.01600.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:PotomacElectricPowerCompany exc:OtherRegulatedRevenue0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

exc:PotomacElectricPowerCompany, us-gaap:RegulatedOperation


Revenuesdei:
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
Value503527479593507528523643530559535630531537506599507514
Percentage of Revenues6.45.35.96.76.96.06.37.26.95.96.16.76.65.56.06.86.75.9
Percentage of RevenueFromRelatedParties0.00.00.059300.050700.052800.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:PotomacElectricPowerCompany us-gaap:RegulatedOperation0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Revenues us-gaap:ConsolidationItems

us-gaap:IntersegmentElimination


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-794.0-802.0-892.0-845.0-760.0-826.0-870.0-763.0-751.0-786.0-858.0-780.0-779.0-876.0-758.0-762.0-735.0-770.0-3164.00.00.00.00.00.00.00.0
Percentage of Revenues-10.0-8.1-11.0-9.5-10.4-9.4-10.4-8.5-9.8-8.3-9.7-8.3-9.6-9.0-9.0-8.7-9.6-8.8-40.20.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties0.00.00.0-84500.0-76000.0-82600.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:IntersegmentElimination100.0100.40.0100.0100.0100.20.099.9100.1100.10.0100.1100.4100.00.0100.4100.10.00.0-0.0-0.0-0.00.0-0.0-0.00.0

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

us-gaap:CorporateNonSegment, exc:ContractswithCustomers, exc:GenerationAllOtherSegments


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value107898785869997112108120125130125134156207179206
Percentage of Revenues1.40.91.11.01.21.11.21.31.41.31.41.41.51.41.92.42.32.4
Percentage of RevenueFromRelatedParties0.00.00.08500.08600.09900.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:CorporateNonSegment exc:ContractswithCustomers exc:GenerationAllOtherSegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CorporateNonSegment, exc:Other, exc:GenerationAllOtherSegments


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-208.0-43.0-104.05027210-42.08351-40.0-156.010.026-86.0-85.042-152.044
Percentage of Revenues-2.6-0.4-1.30.60.42.4-0.50.90.7-0.4-1.80.10.3-0.9-1.00.5-2.00.5
Percentage of RevenueFromRelatedParties0.00.00.05000.02700.021000.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:CorporateNonSegment exc:Other exc:GenerationAllOtherSegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:ContractswithCustomers, exc:GenerationErcot


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value179353156249175155174288178130102156165149121164186168
Percentage of Revenues2.33.61.92.82.41.82.13.22.31.41.21.72.01.51.41.92.41.9
Percentage of RevenueFromRelatedParties0.00.00.024900.017500.015500.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:ContractswithCustomers exc:GenerationErcot0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:ContractswithCustomers, exc:GenerationMidAtlantic


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value106211741093132711001264125513511162128612701397122013551263139713681494
Percentage of Revenues13.411.913.515.015.014.515.015.115.113.614.414.915.114.015.115.917.917.1
Percentage of RevenueFromRelatedParties0.00.00.0132700.0110000.0126400.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:ContractswithCustomers exc:GenerationMidAtlantic0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:ContractswithCustomers, exc:GenerationMidwest


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value97510099449748559441012105297410551095109510621273975982986980
Percentage of Revenues12.310.211.611.011.710.812.111.812.711.112.411.613.213.111.611.212.911.2
Percentage of RevenueFromRelatedParties0.00.00.097400.085500.094400.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:ContractswithCustomers exc:GenerationMidwest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:ContractswithCustomers, exc:GenerationNaturalGas


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value253864402169209503405160177584508200295522421226244768
Percentage of Revenues3.28.75.01.92.95.84.91.82.36.25.82.13.75.45.02.63.28.8
Percentage of RevenueFromRelatedParties0.00.00.016900.020900.050300.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:ContractswithCustomers exc:GenerationNaturalGas0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:ContractswithCustomers, exc:GenerationNewYork


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value376382370401336335376414373409418475392439444454405303
Percentage of Revenues4.83.94.64.54.63.84.54.64.94.34.75.14.94.55.35.25.33.5
Percentage of RevenueFromRelatedParties0.00.00.040100.033600.033500.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:ContractswithCustomers exc:GenerationNewYork0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:ContractswithCustomers, exc:GenerationOtherRegions


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value921117286893777610078388738141165157293210210155167142128
Percentage of Revenues11.611.910.710.610.611.510.09.810.612.31.83.12.62.21.81.91.91.5
Percentage of RevenueFromRelatedParties0.00.00.093700.077600.0100700.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:ContractswithCustomers exc:GenerationOtherRegions0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:ContractswithCustomers, exc:GenerationReportableSegmentsTotal


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value351340903431388832423705365539783501404537594082360041513467366835493662
Percentage of Revenues44.441.442.343.944.342.443.844.645.542.742.643.444.642.841.441.846.641.8
Percentage of RevenueFromRelatedParties0.00.00.0388800.0324200.0370500.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:ContractswithCustomers exc:GenerationReportableSegmentsTotal0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:ContractswithCustomers, exc:GenerationTotalConsolidatedGroup


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value387350433920414235374307415742503786474943924412402048074044410139724636
Percentage of Revenues48.951.048.346.848.349.249.847.649.250.149.846.949.849.648.346.852.152.9
Percentage of RevenueFromRelatedParties0.00.00.0414200.0353700.0430700.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:ContractswithCustomers exc:GenerationTotalConsolidatedGroup0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:Other, exc:GenerationErcot


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value92-101.0437452283172477910128911159881446124
Percentage of Revenues1.2-1.00.50.80.70.30.40.80.60.81.13.11.40.61.01.60.80.3
Percentage of RevenueFromRelatedParties0.00.00.07400.05200.02800.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:Other exc:GenerationErcot0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:Other, exc:GenerationMidAtlantic


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value24-14.0-16.0-20.0-35.0-96.08.010.021-24.0425258804524-12.0-65.0
Percentage of Revenues0.3-0.1-0.2-0.2-0.5-1.10.10.10.3-0.30.50.60.70.80.50.3-0.2-0.7
Percentage of RevenueFromRelatedParties0.00.00.0-2000.0-3500.0-9600.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:Other exc:GenerationMidAtlantic0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:Other, exc:GenerationMidwest


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-13.0-11.0726810764604768592126737173677271
Percentage of Revenues-0.2-0.10.90.81.50.70.70.50.90.60.20.30.90.70.90.80.90.8
Percentage of RevenueFromRelatedParties0.00.00.06800.010700.06400.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:Other exc:GenerationMidwest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:Other, exc:GenerationNaturalGas


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value254462253154144169264105156295371197194433347234186150
Percentage of Revenues3.24.73.11.72.01.93.21.22.03.14.22.12.44.54.12.72.41.7
Percentage of RevenueFromRelatedParties0.00.00.015400.014400.016900.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:Other exc:GenerationNaturalGas0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:Other, exc:GenerationNewYork


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value5.0-45.00.05.05.0-21.09.01517-16.01.0-6.0-2.0-29.0-1.0-21.0-13.0-3.0
Percentage of Revenues0.1-0.50.00.10.1-0.20.10.20.2-0.20.0-0.1-0.0-0.3-0.0-0.2-0.2-0.0
Percentage of RevenueFromRelatedParties0.00.00.0500.0500.0-2100.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:Other exc:GenerationNewYork0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:Other, exc:GenerationOtherRegions


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value12626816318643721571926419419926511310911418112661
Percentage of Revenues1.62.72.02.10.60.81.92.20.82.02.32.81.41.11.42.11.70.7
Percentage of RevenueFromRelatedParties0.00.00.018600.04300.07200.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:Other exc:GenerationOtherRegions0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:Other, exc:GenerationReportableSegmentsTotal


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value234972623131724726533621729246265933935835137321048
Percentage of Revenues3.01.03.23.52.30.53.23.82.83.15.27.04.23.74.24.32.80.5
Percentage of RevenueFromRelatedParties0.00.00.031300.017200.04700.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:Other exc:GenerationReportableSegmentsTotal0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:Other, exc:GenerationTotalConsolidatedGroup


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value280516411517343426487524424547677866559705613649244242
Percentage of Revenues3.55.25.15.84.74.95.85.95.55.87.79.26.97.37.37.43.22.8
Percentage of RevenueFromRelatedParties0.00.00.051700.034300.042600.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:Other exc:GenerationTotalConsolidatedGroup0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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

us-gaap:CorporateNonSegment, exc:GenerationAllOtherSegments


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-30
Value-101.046-17.01351133095519515980-31.0140151488397094551168675713-66.01044710469569
Percentage of Revenues-1.30.5-0.21.51.53.50.72.22.10.8-0.41.51.90.510.08.16.013.38.67.9-1.013.810.66.38.7
Percentage of RevenueFromRelatedParties0.00.00.013500.011300.030900.00.00.00.00.00.00.00.00.00.00.00.00.00.071300.0-6600.00.00.023450.056900.0
Percentage of RevenueFromRelatedParties us-gaap:CorporateNonSegment exc:GenerationAllOtherSegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CorporateNonSegment, us-gaap:CorporateAndOther


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value524491595484472480511474484455550458487451515446449419
Percentage of Revenues6.65.07.35.56.45.56.15.36.34.86.24.96.04.76.15.15.94.8
Percentage of RevenueFromRelatedParties0.00.00.048400.047200.048000.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:CorporateNonSegment us-gaap:CorporateAndOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:AtlanticCityElectricCompany


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value319310293420256276274419274273255406265310271370270275
Percentage of Revenues4.03.13.64.73.53.23.34.73.62.92.94.33.33.23.24.23.53.1
Percentage of RevenueFromRelatedParties0.00.00.042000.025600.027600.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:AtlanticCityElectricCompany0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:BaltimoreGasAndElectricCompany


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value68297481473161693777970364997680073166297781373867495172562810367616976531054
Percentage of Revenues8.69.810.08.38.410.79.37.98.410.39.17.88.210.19.78.48.810.99.89.611.710.510.110.814.6
Percentage of RevenueFromRelatedParties0.00.00.073100.061600.093700.00.00.00.00.00.00.00.00.00.00.00.00.036250.062800.0103600.00.00.00.0105400.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:BaltimoreGasAndElectricCompany0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.024166.762800.014800.00.023233.332650.06587.5

us-gaap:OperatingSegments, exc:CommonwealthEdisonCo


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value1517153514051643141714391405158313511408137415981398151213091571135712981376114811851080122211281134
Percentage of Revenues19.215.517.318.619.416.516.817.717.614.915.617.017.315.615.617.917.814.818.617.613.414.917.718.715.7
Percentage of RevenueFromRelatedParties0.00.00.0164300.0141700.0143900.00.00.00.00.00.00.00.00.00.00.00.00.068800.0114800.0118500.00.00.00.0113400.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:CommonwealthEdisonCo0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0137600.0114800.0118500.00.0122200.00.0113400.0

us-gaap:OperatingSegments, exc:DelmarvaPowerandLightCompany


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value298382317337267350319319287380331328289384329327282362
Percentage of Revenues3.83.93.93.83.64.03.83.63.74.03.83.53.64.03.93.73.74.1
Percentage of RevenueFromRelatedParties0.00.00.033700.026700.035000.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:DelmarvaPowerandLightCompany0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:ExelonGenerationCoLLC


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value4153555943314659388047334644477442105296506952784579551246574750421648784768423258404802441237894390
Percentage of Revenues52.556.253.452.653.054.155.753.554.855.957.556.156.756.955.654.255.355.764.465.066.166.263.862.960.7
Percentage of RevenueFromRelatedParties0.00.00.0465900.0388000.0473300.00.00.00.00.00.00.00.00.00.00.00.00.0238400.0423200.0584000.00.00.00.0439000.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:ExelonGenerationCoLLC0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.02325.92784.22781.00.03939.31885.11389.2

us-gaap:OperatingSegments, exc:GenerationErcot


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value271252199323227183205360225209203445276208209308247192172289207163172317194182195303198243
Percentage of Revenues3.42.52.53.63.12.12.54.02.92.22.34.73.42.12.53.53.22.22.23.23.02.22.64.33.02.12.74.43.33.4
Percentage of RevenueFromRelatedParties0.00.00.032300.022700.018300.00.00.00.00.00.00.00.00.00.00.00.00.00.028900.020700.00.00.015850.019400.018200.00.00.00.024300.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:GenerationErcot0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:GenerationMidAtlantic


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value108611601077130710651168126313611183126213121449127814351308142113561429143618131432153214991622133615171267128512721441
Percentage of Revenues13.711.713.314.814.513.415.115.215.413.314.915.415.814.815.616.217.816.318.220.120.720.222.421.920.517.217.518.621.119.9
Percentage of RevenueFromRelatedParties0.00.00.0130700.0106500.0116800.00.00.00.00.00.00.00.00.00.00.00.00.00.0181300.0143200.00.00.081100.0133600.0151700.00.00.00.0144100.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:GenerationMidAtlantic0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:GenerationMidwest


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value96299810161042962100810721099104211141116112111351344104810491058105110721163107610891082115012051275116510629811258
Percentage of Revenues12.210.112.511.813.111.512.812.313.611.812.711.914.113.912.512.013.912.013.612.915.614.416.115.518.514.416.115.416.317.4
Percentage of RevenueFromRelatedParties0.00.00.0104200.096200.0100800.00.00.00.00.00.00.00.00.00.00.00.00.00.0116300.0107600.00.00.057500.0120500.0127500.00.00.00.0125800.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:GenerationMidwest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:GenerationNaturalGas


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value5071326655323353672669265333879879397489955768460430918
Percentage of Revenues6.413.48.13.64.87.78.03.04.39.310.04.26.19.99.25.25.610.5
Percentage of RevenueFromRelatedParties0.00.00.032300.035300.067200.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:GenerationNaturalGas0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:GenerationNewYork


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value381337370406341314385429390393419469390410440434352310292331356218210254222310229230194190
Percentage of Revenues4.83.44.64.64.73.64.64.85.14.14.85.04.84.25.24.94.63.53.73.75.22.93.13.43.43.53.23.33.22.6
Percentage of RevenueFromRelatedParties0.00.00.040600.034100.031400.00.00.00.00.00.00.00.00.00.00.00.00.00.033100.035600.00.00.012700.022200.031000.00.00.00.019000.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:GenerationNewYork0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:GenerationOtherRegions


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value1047144010311123819107999510658781359356558323319269348268189241271232222291383294212292381314334
Percentage of Revenues13.214.612.712.711.212.311.911.911.414.34.05.94.03.33.24.03.52.23.13.03.42.94.35.24.52.44.05.55.24.6
Percentage of RevenueFromRelatedParties0.00.00.0112300.081900.0107900.00.00.00.00.00.00.00.00.00.00.00.00.00.027100.023200.00.00.019150.029400.021200.00.00.00.033400.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:GenerationOtherRegions0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:GenerationReportableSegmentsTotal


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value374741873693420134143752392043143718433742214741393945093815404237193720371343223655369537284245361743543537353331704011
Percentage of Revenues47.342.345.547.546.642.947.048.348.445.847.950.448.846.545.546.148.842.547.148.052.948.855.657.455.549.348.851.152.655.4
Percentage of RevenueFromRelatedParties0.00.00.0420100.0341400.0375200.00.00.00.00.00.00.00.00.00.00.00.00.00.0432200.0365500.00.00.0212250.0361700.0435400.00.00.00.0401100.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:GenerationReportableSegmentsTotal0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:GenerationTotalConsolidatedGroup


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value41535559433146593880473346444774421052965069527845795512465447514174488843885035358947394294476842325840
Percentage of Revenues52.556.253.452.653.054.155.753.554.855.957.556.156.756.955.554.254.855.855.755.951.962.664.164.465.066.1
Percentage of RevenueFromRelatedParties0.00.00.0465900.0388000.0473300.00.00.00.00.00.00.00.00.00.00.00.00.00.0503500.0358900.00.00.0238400.0423200.0584000.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:GenerationTotalConsolidatedGroup0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:PecoEnergyCo


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value693889752813681813767778655900763757653866729715630796740661985751693656993
Percentage of Revenues8.89.09.39.29.39.39.28.78.59.58.78.18.18.98.78.28.39.110.010.111.210.410.010.913.7
Percentage of RevenueFromRelatedParties0.00.00.081300.068100.081300.00.00.00.00.00.00.00.00.00.00.00.00.037000.066100.098500.00.00.00.099300.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:PecoEnergyCo0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.074000.00.00.00.00.00.099300.0

us-gaap:OperatingSegments, exc:PepcoHoldingsLLC


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value114012441109136810161171110613801091122811171361107612511122131010741175
Percentage of Revenues14.412.613.715.513.913.413.315.514.213.012.714.513.312.913.414.914.113.4
Percentage of RevenueFromRelatedParties0.00.00.0136800.0101600.0117100.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:PepcoHoldingsLLC0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, exc:PotomacElectricPowerCompany


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value523553499611494544512642531575531628523557509604514530
Percentage of Revenues6.65.66.16.96.76.26.17.26.96.16.06.76.55.76.16.96.76.1
Percentage of RevenueFromRelatedParties0.00.00.061100.049400.054400.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties us-gaap:OperatingSegments exc:PotomacElectricPowerCompany0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Revenues us-gaap:StatementBusinessSegments

exc:GenerationAllOtherSegments


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-03-31
Value-101.046-17.01351133095619515980-30.0140151488397234731181703764-37.0106574352361414881266881620382608629852-21.0559-24.0219
Percentage of Revenues-1.30.5-0.21.51.53.50.72.22.10.8-0.31.51.90.510.08.26.213.58.98.5-0.514.111.17.19.416.917.512.710.35.39.99.713.9-0.38.9-0.44.7
Percentage of RevenueFromRelatedParties0.00.00.013500.011300.030900.00.00.00.00.00.00.00.00.00.00.00.00.00.076400.0-3700.00.00.026150.061400.0148800.00.00.00.038200.00.031450.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:GenerationAllOtherSegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

exc:GenerationErcot


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value275257204330234190208365229212203444277209209314247191172295207163170316192180194302197243182427315293291533
Percentage of Revenues3.52.62.53.73.22.22.54.13.02.22.34.73.42.22.53.63.22.22.23.33.02.22.54.32.92.02.74.43.33.43.06.65.14.84.68.1
Percentage of RevenueFromRelatedParties0.00.00.033000.023400.019000.00.00.00.00.00.00.00.00.00.00.00.00.00.029500.020700.00.00.015800.019200.018000.00.00.00.024300.00.021350.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:GenerationErcot0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

exc:GenerationMidAtlantic


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value109111651084131310741174126513641189125613081456128214401318143213651425144318001416152014091632134615131275128912771418126113911229132312931417
Percentage of Revenues13.811.813.414.814.713.415.215.315.513.314.815.515.914.915.716.317.916.318.320.020.520.121.022.120.717.117.618.621.219.620.521.420.021.820.621.6
Percentage of RevenueFromRelatedParties0.00.00.0131300.0107400.0117400.00.00.00.00.00.00.00.00.00.00.00.00.00.0180000.0141600.00.00.081600.0134600.0151300.00.00.00.0141800.00.069550.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:GenerationMidAtlantic0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

exc:GenerationMidwest


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value9629981017104396210021069108210341108111311171130134610401038105010531069116410831095107711511206127611621061981127099910131071118812051200
Percentage of Revenues12.210.112.511.813.111.512.812.113.411.712.611.914.013.912.411.813.812.013.612.915.714.516.115.618.514.516.015.416.317.516.215.617.419.519.218.3
Percentage of RevenueFromRelatedParties0.00.00.0104300.096200.0100200.00.00.00.00.00.00.00.00.00.00.00.00.00.0116400.0108300.00.00.057550.0120600.0127600.00.00.00.0127000.00.050650.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:GenerationMidwest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

exc:GenerationNaturalGas


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value5071326655323353672669299348894836440526980769480449930
Percentage of Revenues6.413.48.13.64.87.78.03.34.59.49.54.76.510.19.25.55.910.6
Percentage of RevenueFromRelatedParties0.00.00.032300.035300.067200.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:GenerationNaturalGas0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

exc:GenerationNewYork


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value381337370406340314385429390393418469392409437428347307283323346203207250218310230232194187187184174169210185
Percentage of Revenues4.83.44.64.64.63.64.64.85.14.14.75.04.94.25.24.94.63.53.63.65.02.73.13.43.33.53.23.43.22.63.02.82.82.83.32.8
Percentage of RevenueFromRelatedParties0.00.00.040600.034000.031400.00.00.00.00.00.00.00.00.00.00.00.00.00.032300.034600.00.00.012500.021800.031000.00.00.00.018700.00.09200.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:GenerationNewYork0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

exc:GenerationOtherRegions


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value1038143010181109804107299210408611353406513287288270335259184221238223223222376289214286375308341231271240225104329
Percentage of Revenues13.114.512.512.511.012.311.911.611.214.34.65.53.63.03.23.83.42.12.82.63.22.93.35.14.42.43.95.45.14.73.74.23.93.71.75.0
Percentage of RevenueFromRelatedParties0.00.00.0110900.080400.0107200.00.00.00.00.00.00.00.00.00.00.00.00.00.023800.022300.00.00.018800.028900.021400.00.00.00.034100.00.013550.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:GenerationOtherRegions0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

exc:GenerationReportableSegmentsTotal


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value374741873693420134143752391942803703432242634698390244843815402837013707368542713626367435514245361843523536353131694008316436263218360133394055
Percentage of Revenues47.342.345.547.546.642.947.047.948.245.648.450.048.346.345.545.948.642.346.847.452.548.553.057.455.549.348.751.152.655.451.355.852.459.253.161.8
Percentage of RevenueFromRelatedParties0.00.00.0420100.0341400.0375200.00.00.00.00.00.00.00.00.00.00.00.00.00.0427100.0362600.00.00.0212250.0361800.0435200.00.00.00.0400800.00.0181300.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:GenerationReportableSegmentsTotal0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

exc:GenerationTotalConsolidatedGroup


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value41535559433146593880473346444774421052965069527845795512465447514174488843885035358947394294476842325840480244123789439037724255407035333898403137652743
Percentage of Revenues52.556.253.452.653.054.155.753.554.855.957.556.156.756.955.554.254.855.855.755.951.962.664.164.465.066.166.263.862.960.761.265.466.358.162.061.463.258.5
Percentage of RevenueFromRelatedParties0.00.00.0465900.0388000.0473300.00.00.00.00.00.00.00.00.00.00.00.00.00.0503500.0358900.00.00.0238400.0423200.0584000.00.00.00.0439000.00.0212750.00.00.00.00.00.00.0
Percentage of RevenueFromRelatedParties exc:GenerationTotalConsolidatedGroup0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets

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
Value12939613000012931712776712631312467712497712273812159612159311966611948511724911701811670011847311710411706811490411453511277811174295384951289221387391868148526483656794687992479661784207824378554783537743477628550925415651986513765224049180
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

Liabilities

us-gaap:Liabilities

us-gaap:Liabilities


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
Value9489695687944499266491442900619040488386876898788986596860978441084453845688815687814887778729287049854568453768062678396714462753626816021459427566905698457594568325683056737561635502555439406173971037784373553859036453
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets73.373.673.072.572.472.272.372.072.172.372.472.172.072.272.574.475.075.876.076.075.875.771.471.372.871.872.270.671.071.371.372.372.572.672.271.771.171.473.773.372.772.773.974.1

us-gaap:Liabilities dei:LegalEntity

exc:AtlanticCityElectricCompany


Liabilitiesdei:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value29572985289528132701271126572648260526542573262125802489240224522430239924232442243025042387
Percentage of Liabilities3.13.13.13.03.03.02.93.03.03.03.03.03.12.92.82.82.82.72.82.82.83.03.5
Percentage of Assets2.32.32.22.22.12.22.12.22.12.22.22.22.22.12.12.12.12.02.12.12.22.22.5
Percentage of Assets exc:AtlanticCityElectricCompany66.163.867.567.066.168.167.667.667.070.269.671.071.370.569.769.969.969.570.169.670.273.870.5

exc:BaltimoreGasAndElectricCompany


Liabilitiesdei:
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
Value788174277453731672226987695167546558650963626297602659785963591558685897585661005395541754185289519053075325521452225318530651495510520451415161485351014904
Percentage of Liabilities8.37.87.97.97.97.87.77.67.57.47.37.37.17.17.16.76.76.66.77.06.36.48.07.87.78.58.58.78.89.49.38.99.79.29.19.28.89.212.1
Percentage of Assets6.15.75.85.75.75.65.65.55.45.45.35.35.15.15.15.05.05.05.15.34.84.85.75.65.66.16.16.16.26.76.66.57.06.76.56.66.36.68.9
Percentage of Assets exc:BaltimoreGasAndElectricCompany64.763.264.064.365.564.865.465.565.565.365.566.065.265.065.566.366.866.967.368.964.864.865.365.064.765.365.965.966.366.867.567.269.268.168.668.867.469.268.1

exc:CommonwealthEdisonCo


Liabilitiesdei:
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
Value2346423228231372314823112223012208821729214292124220966210122057920296201842020520180198951961019410196671858018289180291796717793174851704016846167041659016213159481589715582152961549015530156161600315405154151474213815
Percentage of Liabilities24.724.324.525.025.324.824.424.624.424.224.224.424.424.023.922.923.022.422.522.323.022.026.926.626.828.427.928.328.329.529.128.228.128.027.527.228.228.038.440.340.841.338.237.9
Percentage of Assets18.117.917.918.118.317.917.717.717.617.517.517.617.617.317.317.117.217.017.116.917.416.619.219.019.520.420.120.020.121.020.820.420.320.319.819.520.020.028.329.529.630.028.228.1
Percentage of Assets exc:CommonwealthEdisonCo66.466.767.167.668.267.367.467.267.267.367.267.567.667.667.968.169.269.269.269.370.069.168.969.069.269.268.968.668.668.868.868.468.368.468.068.168.668.868.969.668.969.168.166.7

exc:DelmarvaPowerandLightCompany


Liabilitiesdei:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value34103420346433083282327032503204316131393079308430603053302229252887283828272728271928322732
Percentage of Liabilities3.63.63.73.63.63.63.63.63.63.63.63.63.63.63.63.33.33.23.23.13.23.44.0
Percentage of Assets2.62.62.72.62.62.62.62.62.62.62.62.62.62.62.62.52.52.42.52.42.42.52.9
Percentage of Assets exc:DelmarvaPowerandLightCompany65.265.467.466.366.167.467.367.867.567.467.167.067.169.769.468.468.267.768.167.868.571.568.8

exc:ExelonGenerationCoLLC


Liabilitiesdei:
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
Value3283633886334183244831776326993316532391328103298632048322473172932417324833394735000350453371833829335303364933559335553246932150312973069330772285722849027947274812772128016281602758227834187251806317841180581735715614
Percentage of Liabilities34.635.435.435.034.736.336.736.637.437.537.037.537.638.438.438.539.939.538.638.939.239.849.349.548.451.249.951.051.850.450.048.548.448.849.450.150.150.246.145.547.248.345.042.8
Percentage of Assets25.426.125.825.425.226.226.526.427.027.126.827.027.127.727.828.729.929.929.329.529.730.135.235.335.236.836.136.036.836.035.635.135.035.435.735.935.635.934.033.434.335.133.231.7
Percentage of Assets exc:ExelonGenerationCoLLC71.771.669.568.567.668.367.767.567.867.867.466.966.667.067.171.172.772.171.871.171.571.672.172.272.070.969.068.269.369.669.169.069.369.368.968.567.166.768.369.269.670.470.769.7

exc:PecoEnergyCo


Liabilitiesdei:
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
Value84618322799878467702707172917243694769136822693768106815659379387555746274167649726571717131684569356979682269476683669265526726639863846284659661756180613163056002592660156367
Percentage of Liabilities8.98.78.58.58.47.98.18.27.97.97.98.18.18.17.89.08.68.48.58.88.58.510.510.110.311.110.911.511.211.811.511.711.311.211.111.711.211.115.115.915.915.915.617.5
Percentage of Assets6.56.46.26.16.15.75.85.95.75.75.75.85.85.85.66.76.56.46.56.76.46.47.57.27.58.07.98.18.08.48.28.48.28.28.08.48.08.011.111.611.511.511.512.9
Percentage of Assets exc:PecoEnergyCo62.764.363.863.663.561.363.663.763.163.164.165.365.866.764.869.168.468.368.569.368.668.568.868.068.568.668.669.168.568.568.169.068.067.367.268.367.167.167.067.566.766.566.970.6

exc:PepcoHoldingsLLC


Liabilitiesdei:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value137761373613692133251310313027131111302812882130041270212791126661255612422
Percentage of Liabilities14.514.414.514.414.314.514.514.714.714.814.714.915.014.914.7
Percentage of Assets10.610.610.610.410.410.410.510.610.610.710.610.710.810.710.6
Percentage of Assets exc:PepcoHoldingsLLC56.856.357.757.057.057.357.757.757.458.357.858.358.258.758.5

exc:PotomacElectricPowerCompany


Liabilitiesdei:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value62366121606160055817576957545690564056355559553554705357529952595144508950354897482047844668
Percentage of Liabilities6.66.46.46.56.46.46.46.46.46.46.46.46.56.36.36.05.95.75.85.65.65.76.9
Percentage of Assets4.84.74.74.74.64.64.64.64.64.64.64.64.74.64.54.44.44.34.44.34.34.34.9
Percentage of Assets exc:PotomacElectricPowerCompany65.064.565.465.165.665.366.466.165.966.967.067.567.367.867.767.667.368.668.667.867.969.667.6

us-gaap:Liabilities dei:LegalEntity, exc:UnconsolidatedEntity

exc:ExelonGenerationCoLLC, us-gaap:VariableInterestEntityNotPrimaryBeneficiary


Liabilitiesdei:
Period End2021-06-302021-03-312020-12-31
Value305313284
Percentage of Liabilities0.30.30.3
Percentage of Assets0.20.20.2
Percentage of Assets exc:ExelonGenerationCoLLC us-gaap:VariableInterestEntityNotPrimaryBeneficiary26.226.624.1

us-gaap:Liabilities dei:LegalEntity, exc:UnconsolidatedEntity, exc:VariableInterestEntitiesbyInterestType

exc:ExelonGenerationCoLLC, us-gaap:VariableInterestEntityNotPrimaryBeneficiary, exc:CommercialAgreementVIE


Liabilitiesdei:
Period End2021-06-302021-03-312020-12-31
Value959561
Percentage of Liabilities0.10.10.1
Percentage of Assets0.10.10.0
Percentage of Assets exc:ExelonGenerationCoLLC us-gaap:VariableInterestEntityNotPrimaryBeneficiary exc:CommercialAgreementVIE12.112.07.9

exc:ExelonGenerationCoLLC, us-gaap:VariableInterestEntityNotPrimaryBeneficiary, exc:EquityInvestmentVIE


Liabilitiesdei:
Period End2021-06-302021-03-312020-12-31
Value210218223
Percentage of Liabilities0.20.20.2
Percentage of Assets0.20.20.2
Percentage of Assets exc:ExelonGenerationCoLLC us-gaap:VariableInterestEntityNotPrimaryBeneficiary exc:EquityInvestmentVIE55.656.555.6

us-gaap:Liabilities dei:LegalEntity, exc:VariableInterestEntitiesbyInterestType, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

exc:ExelonGenerationCoLLC, exc:CommercialAgreementVIE, us-gaap:VariableInterestEntityNotPrimaryBeneficiary


Liabilitiesdei:
Period End2020-12-312020-09-302020-06-302019-12-31
Value6121617233
Percentage of Liabilities0.10.20.20.0
Percentage of Assets0.00.20.10.0
Percentage of Assets exc:ExelonGenerationCoLLC exc:CommercialAgreementVIE us-gaap:VariableInterestEntityNotPrimaryBeneficiary7.929.324.45.2

exc:ExelonGenerationCoLLC, exc:EquityInvestmentVIE, us-gaap:VariableInterestEntityNotPrimaryBeneficiary


Liabilitiesdei:
Period End2020-12-312020-09-302020-06-302019-12-31
Value223225227227
Percentage of Liabilities0.20.20.20.3
Percentage of Assets0.20.20.20.2
Percentage of Assets exc:ExelonGenerationCoLLC exc:EquityInvestmentVIE us-gaap:VariableInterestEntityNotPrimaryBeneficiary55.655.054.451.2

us-gaap:Liabilities dei:LegalEntity, us-gaap:ConsolidatedEntities

exc:AtlanticCityElectricCompany, us-gaap:VariableInterestEntityPrimaryBeneficiary


Liabilitiesdei:
Period End2021-06-302021-03-312020-12-31
Value111621
Percentage of Liabilities0.00.00.0
Percentage of Assets0.00.00.0
Percentage of Assets exc:AtlanticCityElectricCompany us-gaap:VariableInterestEntityPrimaryBeneficiary91.7123.1161.5

exc:ExelonGenerationCoLLC, us-gaap:VariableInterestEntityPrimaryBeneficiary


Liabilitiesdei:
Period End2021-06-302021-03-312020-12-31
Value356435593580
Percentage of Liabilities3.83.73.8
Percentage of Assets2.82.72.8
Percentage of Assets exc:ExelonGenerationCoLLC us-gaap:VariableInterestEntityPrimaryBeneficiary34.634.934.2

exc:PepcoHoldingsLLC, us-gaap:VariableInterestEntityPrimaryBeneficiary


Liabilitiesdei:
Period End2021-06-302021-03-312020-12-31
Value152126
Percentage of Liabilities0.00.00.0
Percentage of Assets0.00.00.0
Percentage of Assets exc:PepcoHoldingsLLC us-gaap:VariableInterestEntityPrimaryBeneficiary93.8116.7144.4

us-gaap:Liabilities dei:LegalEntity, us-gaap:ConsolidatedEntities, us-gaap:RecourseStatus

exc:AtlanticCityElectricCompany, us-gaap:VariableInterestEntityPrimaryBeneficiary, us-gaap:Nonrecourse


Liabilitiesdei:
Period End2021-06-302021-03-312020-12-31
Value111621
Percentage of Liabilities0.00.00.0
Percentage of Assets0.00.00.0
Percentage of Assets exc:AtlanticCityElectricCompany us-gaap:VariableInterestEntityPrimaryBeneficiary us-gaap:Nonrecourse0.00.00.0

exc:ExelonGenerationCoLLC, us-gaap:VariableInterestEntityPrimaryBeneficiary, us-gaap:Nonrecourse


Liabilitiesdei:
Period End2021-06-302021-03-312020-12-31
Value356335573572
Percentage of Liabilities3.83.73.8
Percentage of Assets2.82.72.8
Percentage of Assets exc:ExelonGenerationCoLLC us-gaap:VariableInterestEntityPrimaryBeneficiary us-gaap:Nonrecourse0.00.00.0

exc:ExelonGenerationCoLLC, us-gaap:VariableInterestEntityPrimaryBeneficiary, us-gaap:Recourse


Liabilitiesdei:
Period End2021-06-302021-03-312020-12-31
Value1.02.08.0
Percentage of Liabilities0.00.00.0
Percentage of Assets0.00.00.0
Percentage of Assets exc:ExelonGenerationCoLLC us-gaap:VariableInterestEntityPrimaryBeneficiary us-gaap:Recourse0.00.00.0

exc:PepcoHoldingsLLC, us-gaap:VariableInterestEntityPrimaryBeneficiary, us-gaap:Nonrecourse


Liabilitiesdei:
Period End2021-06-302021-03-312020-12-31
Value152126
Percentage of Liabilities0.00.00.0
Percentage of Assets0.00.00.0
Percentage of Assets exc:PepcoHoldingsLLC us-gaap:VariableInterestEntityPrimaryBeneficiary us-gaap:Nonrecourse0.00.00.0

us-gaap:Liabilities dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

exc:AtlanticCityElectricCompany, us-gaap:VariableInterestEntityPrimaryBeneficiary


Liabilitiesdei:
Period End2020-12-312020-09-302020-06-302019-12-31
Value21263141
Percentage of Liabilities0.00.00.00.0
Percentage of Assets0.00.00.00.0
Percentage of Assets exc:AtlanticCityElectricCompany us-gaap:VariableInterestEntityPrimaryBeneficiary161.5185.7221.4241.2

exc:ExelonGenerationCoLLC, us-gaap:VariableInterestEntityNotPrimaryBeneficiary


Liabilitiesdei:
Period End2020-12-312020-09-302020-06-302019-12-31
Value284441399260
Percentage of Liabilities0.30.50.40.3
Percentage of Assets0.20.30.30.2
Percentage of Assets exc:ExelonGenerationCoLLC us-gaap:VariableInterestEntityNotPrimaryBeneficiary24.138.535.624.1

exc:ExelonGenerationCoLLC, us-gaap:VariableInterestEntityPrimaryBeneficiary


Liabilitiesdei:
Period End2020-12-312020-09-302020-06-302019-12-31
Value3580350735073432
Percentage of Liabilities3.83.83.83.8
Percentage of Assets2.82.72.82.7
Percentage of Assets exc:ExelonGenerationCoLLC us-gaap:VariableInterestEntityPrimaryBeneficiary34.233.834.435.0

exc:PepcoHoldingsLLC, us-gaap:VariableInterestEntityPrimaryBeneficiary


Liabilitiesdei:
Period End2020-12-312020-09-302020-06-302019-12-31
Value26323744
Percentage of Liabilities0.00.00.00.0
Percentage of Assets0.00.00.00.0
Percentage of Assets exc:PepcoHoldingsLLC us-gaap:VariableInterestEntityPrimaryBeneficiary144.4160.0176.2220.0

us-gaap:Liabilities dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities, us-gaap:RecourseStatus

exc:AtlanticCityElectricCompany, us-gaap:VariableInterestEntityPrimaryBeneficiary, us-gaap:Nonrecourse


Liabilitiesdei:
Period End2020-12-312020-09-302020-06-302019-12-31
Value21263141
Percentage of Liabilities0.00.00.00.0
Percentage of Assets0.00.00.00.0
Percentage of Assets exc:AtlanticCityElectricCompany us-gaap:VariableInterestEntityPrimaryBeneficiary us-gaap:Nonrecourse0.00.00.00.0

exc:ExelonGenerationCoLLC, us-gaap:VariableInterestEntityPrimaryBeneficiary, us-gaap:Nonrecourse


Liabilitiesdei:
Period End2020-12-312020-09-302020-06-302019-12-31
Value3572349935053429
Percentage of Liabilities3.83.83.83.8
Percentage of Assets2.82.72.82.7
Percentage of Assets exc:ExelonGenerationCoLLC us-gaap:VariableInterestEntityPrimaryBeneficiary us-gaap:Nonrecourse0.00.00.00.0

exc:ExelonGenerationCoLLC, us-gaap:VariableInterestEntityPrimaryBeneficiary, us-gaap:Recourse


Liabilitiesdei:
Period End2020-12-312020-09-302020-06-302019-12-31
Value8.08.02.03.0
Percentage of Liabilities0.00.00.00.0
Percentage of Assets0.00.00.00.0
Percentage of Assets exc:ExelonGenerationCoLLC us-gaap:VariableInterestEntityPrimaryBeneficiary us-gaap:Recourse0.00.00.00.0

exc:PepcoHoldingsLLC, us-gaap:VariableInterestEntityPrimaryBeneficiary, us-gaap:Nonrecourse


Liabilitiesdei:
Period End2020-12-312020-09-302020-06-302019-12-31
Value26323744
Percentage of Liabilities0.00.00.00.0
Percentage of Assets0.00.00.00.0
Percentage of Assets exc:PepcoHoldingsLLC us-gaap:VariableInterestEntityPrimaryBeneficiary us-gaap:Nonrecourse0.00.00.00.0

us-gaap:Liabilities exc:UnconsolidatedEntity

us-gaap:VariableInterestEntityNotPrimaryBeneficiary


Liabilitiesexc:
Period End2021-06-302021-03-312020-12-31
Value305313284
Percentage of Liabilities0.30.30.3
Percentage of Assets0.20.20.2
Percentage of Assets us-gaap:VariableInterestEntityNotPrimaryBeneficiary26.226.624.1

us-gaap:Liabilities exc:UnconsolidatedEntity, exc:VariableInterestEntitiesbyInterestType

us-gaap:VariableInterestEntityNotPrimaryBeneficiary, exc:CommercialAgreementVIE


Liabilitiesexc:
Period End2021-06-302021-03-312020-12-31
Value959561
Percentage of Liabilities0.10.10.1
Percentage of Assets0.10.10.0
Percentage of Assets us-gaap:VariableInterestEntityNotPrimaryBeneficiary exc:CommercialAgreementVIE12.112.07.9

us-gaap:VariableInterestEntityNotPrimaryBeneficiary, exc:EquityInvestmentVIE


Liabilitiesexc:
Period End2021-06-302021-03-312020-12-31
Value210218223
Percentage of Liabilities0.20.20.2
Percentage of Assets0.20.20.2
Percentage of Assets us-gaap:VariableInterestEntityNotPrimaryBeneficiary exc:EquityInvestmentVIE55.656.555.6

us-gaap:Liabilities exc:VariableInterestEntitiesbyInterestType, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

exc:CommercialAgreementVIE, us-gaap:VariableInterestEntityNotPrimaryBeneficiary


Liabilitiesexc:
Period End2020-12-312020-09-302020-06-302019-12-31
Value6121617233
Percentage of Liabilities0.10.20.20.0
Percentage of Assets0.00.20.10.0
Percentage of Assets exc:CommercialAgreementVIE us-gaap:VariableInterestEntityNotPrimaryBeneficiary7.929.324.45.2

exc:EquityInvestmentVIE, us-gaap:VariableInterestEntityNotPrimaryBeneficiary


Liabilitiesexc:
Period End2020-12-312020-09-302020-06-302019-12-31
Value223225227227
Percentage of Liabilities0.20.20.20.3
Percentage of Assets0.20.20.20.2
Percentage of Assets exc:EquityInvestmentVIE us-gaap:VariableInterestEntityNotPrimaryBeneficiary55.655.054.451.2

us-gaap:Liabilities us-gaap:ConsolidatedEntities

srt:ParentCompany


Liabilitiesus-gaap:
Period End2020-12-312019-12-312018-12-31
Value180321715016745
Percentage of Liabilities19.119.019.3
Percentage of Assets13.913.714.0
Percentage of Assets srt:ParentCompany35.634.735.3

us-gaap:VariableInterestEntityPrimaryBeneficiary


Liabilitiesus-gaap:
Period End2021-06-302021-03-312020-12-31
Value357935803606
Percentage of Liabilities3.83.73.8
Percentage of Assets2.82.82.8
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary34.635.034.4

us-gaap:Liabilities us-gaap:ConsolidatedEntities, us-gaap:RecourseStatus

us-gaap:VariableInterestEntityPrimaryBeneficiary, us-gaap:Nonrecourse


Liabilitiesus-gaap:
Period End2021-06-302021-03-312020-12-31
Value357835783598
Percentage of Liabilities3.83.73.8
Percentage of Assets2.82.82.8
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary us-gaap:Nonrecourse0.00.00.0

us-gaap:VariableInterestEntityPrimaryBeneficiary, us-gaap:Recourse


Liabilitiesus-gaap:
Period End2021-06-302021-03-312020-12-31
Value1.02.08.0
Percentage of Liabilities0.00.00.0
Percentage of Assets0.00.00.0
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary us-gaap:Recourse0.00.00.0

us-gaap:Liabilities us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:VariableInterestEntityNotPrimaryBeneficiary


Liabilitiesus-gaap:
Period End2020-12-312020-09-302020-06-302019-12-31
Value284441399260
Percentage of Liabilities0.30.50.40.3
Percentage of Assets0.20.30.30.2
Percentage of Assets us-gaap:VariableInterestEntityNotPrimaryBeneficiary24.138.535.624.1

us-gaap:VariableInterestEntityPrimaryBeneficiary


Liabilitiesus-gaap:
Period End2020-12-312020-09-302020-06-302019-12-31
Value3606353935443476
Percentage of Liabilities3.83.83.93.8
Percentage of Assets2.82.82.82.8
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary34.434.134.735.4

us-gaap:Liabilities us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities, us-gaap:RecourseStatus

us-gaap:VariableInterestEntityPrimaryBeneficiary, us-gaap:Nonrecourse


Liabilitiesus-gaap:
Period End2020-12-312020-09-302020-06-302019-12-31
Value3598353135423473
Percentage of Liabilities3.83.83.93.8
Percentage of Assets2.82.82.82.8
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary us-gaap:Nonrecourse0.00.00.00.0

us-gaap:VariableInterestEntityPrimaryBeneficiary, us-gaap:Recourse