CMS


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

Table of contents



us-gaap:CommonStockValue

us-gaap:CommonStockSharesOutstanding
us-gaap:StatementEquityComponents

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:IncomeLossFromContinuingOperationsPerBasicShare

us-gaap:IncomeLossFromContinuingOperationsPerDilutedShare

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
dei:LegalEntity
us-gaap:ProductOrService
us-gaap:CostOfGoodsAndServicesSold

us-gaap:CostsAndExpenses

us-gaap:IncomeLossFromContinuingOperations

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
dei:LegalEntity

us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest

us-gaap:IncomeTaxExpenseBenefit
dei:LegalEntity

us-gaap:InterestExpense
dei:LegalEntity

us-gaap:InterestExpenseDebt
dei:LegalEntity

us-gaap:NetIncomeLoss
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest
dei:LegalEntity
us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic
dei:LegalEntity, us-gaap:ConsolidationItems
dei:LegalEntity, us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:NonoperatingIncomeExpense
dei:LegalEntity

us-gaap:OperatingIncomeLoss
dei:LegalEntity

us-gaap:OtherComprehensiveIncomeLossNetOfTax
dei:LegalEntity

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

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
dei:LegalEntity
dei:LegalEntity, us-gaap:ConsolidationItems, us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
dei:LegalEntity, us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
dei:LegalEntity, us-gaap:ProductOrService
us-gaap:ConsolidationItems, us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ProductOrService

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

us-gaap:Assets
dei:LegalEntity
dei:LegalEntity, us-gaap:ConsolidationItems
dei:LegalEntity, us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ConsolidatedEntities
us-gaap:Liabilities

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

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

us-gaap:AssetsCurrent
dei:LegalEntity
us-gaap:ConsolidatedEntities

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

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
dei:LegalEntity

us-gaap:AccountsReceivableNetCurrent
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:OtherAssetsCurrent
dei:LegalEntity

us-gaap:ConstructionInProgressGross

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:PublicUtility

us-gaap:PropertyPlantAndEquipmentNet
us-gaap:ConsolidatedEntities

us-gaap:OperatingLeaseRightOfUseAsset
dei:LegalEntity

us-gaap:OtherAssetsNoncurrent
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:AccountsPayableCurrent
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:DebtCurrent

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

us-gaap:LongTermDebtCurrent
dei:LegalEntity

us-gaap:OperatingLeaseLiabilityCurrent
dei:LegalEntity

us-gaap:OtherLiabilitiesCurrent
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:RestructuringCostAndReserve, us-gaap:RestructuringPlan

us-gaap:TaxesPayableCurrent
dei:LegalEntity

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

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

us-gaap:DeferredIncomeTaxLiabilitiesNet
dei:LegalEntity

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:ConsolidatedEntities
us-gaap:RetirementPlanType

us-gaap:MinorityInterest

us-gaap:OtherLiabilitiesNoncurrent
dei:LegalEntity
us-gaap:ConsolidatedEntities

us-gaap:OperatingLeaseLiabilityNoncurrent
dei:LegalEntity

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo
dei:LegalEntity

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree
dei:LegalEntity

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour
dei:LegalEntity

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive
dei:LegalEntity

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive
dei:LegalEntity

us-gaap:OperatingLeaseLiability
dei:LegalEntity

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue
dei:LegalEntity

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount
dei:LegalEntity

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

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

us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapitalCommonStock
dei:LegalEntity

us-gaap:RetainedEarningsAccumulatedDeficit
dei:LegalEntity

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax
dei:LegalEntity

us-gaap:MinorityInterest
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodValueNewIssues
us-gaap:StatementEquityComponents
us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders

us-gaap:NetCashProvidedByUsedInOperatingActivities
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInInvestingActivities
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInFinancingActivities
dei:LegalEntity

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
dei:LegalEntity

us-gaap:DepreciationDepletionAndAmortization

us-gaap:IncreaseDecreaseInInventories
dei:LegalEntity

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInOperatingActivities
dei:LegalEntity

us-gaap:NetIncomeLoss
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

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

us-gaap:NetCashProvidedByUsedInInvestingActivities
dei:LegalEntity

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInFinancingActivities
dei:LegalEntity

us-gaap:ProceedsFromIssuanceOfLongTermDebt
dei:LegalEntity

us-gaap:RepaymentsOfLongTermDebt
dei:LegalEntity

us-gaap:EffectiveIncomeTaxRateContinuingOperations
dei:LegalEntity

us-gaap:DeferredTaxLiabilities
dei:LegalEntity

us-gaap:DeferredTaxAssetsNet
dei:LegalEntity

us-gaap:UnrecognizedTaxBenefits
dei:LegalEntity

us-gaap:DeferredTaxAssetsValuationAllowance
dei:LegalEntity, us-gaap:StatementEquityComponents
cms:AdjustmentsToAdditionalPaidInCapitalStockholderContribution
dei:LegalEntity, us-gaap:RetirementPlanType
cms:DefinedBenefitPlanAmortizationOfSettlementLoss
us-gaap:RetirementPlanType

cms:EffectiveIncomeTaxRateReconciliationAMTSequestrationAmount

cms:EffectiveIncomeTaxRateReconciliationAMTSequestrationPercent

cms:EffectiveIncomeTaxRateReconciliationRegulatoryTaxBenefits
dei:LegalEntity

cms:EffectiveIncomeTaxRateReconciliationRegulatoryTaxBenefitsPercent
dei:LegalEntity

cms:FinancingIncome
dei:LegalEntity
dei:LegalEntity, us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:SubsidiarySaleOfStock
cms:ForwardContractIndexedToIssuersEquityAggregateSalesPrice

cms:InterestAndDividendIncomeRelatedParties
dei:LegalEntity
us-gaap:StatementEquityComponents
cms:MinorityInterestIncreaseFromContributionFromNoncontrollingInterestHolders
us-gaap:StatementEquityComponents
cms:NoncontrollingInterestIncreaseFromAssetAcquisitionVIEConsolidation

cms:OtherNonoperatingIncomeExpenseRetirementBenefitsNet
dei:LegalEntity

cms:PurchasedPowerRelatedParties
dei:LegalEntity
cms:ReductionOfIncomeTaxExpense
us-gaap:BalanceSheetLocation, us-gaap:RestructuringCostAndReserve, us-gaap:RestructuringPlan
cms:RestructuringAndRelatedCostIncurredCostCapitalized
us-gaap:RestructuringCostAndReserve, us-gaap:RestructuringPlan
dei:LegalEntity, us-gaap:TaxCreditCarryforward
cms:TaxCarryforwardAmountIncreaseDecrease
us-gaap:TaxCreditCarryforward
dei:LegalEntity
cms:UtilitiesOperatingExpensePurchasedPowerRelatedParties
us-gaap:ConsolidatedEntities, us-gaap:Ownership
cms:VariableInterestEntityCapacityCommitted
us-gaap:ConsolidatedEntities, us-gaap:Ownership
cms:VariableInterestEntityMaximumCapacity

us-gaap:CapitalExpendituresIncurredButNotYetPaid
dei:LegalEntity

us-gaap:CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries
us-gaap:ConcentrationRiskByType, us-gaap:CreditScoreFico, us-gaap:StatementBusinessSegments
us-gaap:ConcentrationRiskPercentage1
us-gaap:ProductOrService, us-gaap:ConcentrationRiskByType, us-gaap:StatementBusinessSegments
us-gaap:StatementEquityComponents
us-gaap:ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesIssuanceOfEquityBySubsidiaryToNoncontrollingInterests
us-gaap:LongtermDebtType, us-gaap:StatementScenario
us-gaap:DebtInstrumentBasisSpreadOnVariableRate1
us-gaap:StatementScenario, us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType, us-gaap:StatementScenario
us-gaap:DebtInstrumentInterestRateDuringPeriod
us-gaap:StatementScenario, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:DeferredIncomeTaxesAndTaxCredits
dei:LegalEntity
dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses
us-gaap:RetirementPlanType
dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
us-gaap:RetirementPlanType
dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets
us-gaap:RetirementPlanType
dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanInterestCost
us-gaap:RetirementPlanType
dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost
us-gaap:RetirementPlanType
dei:LegalEntity, us-gaap:RegulatoryAsset, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1
us-gaap:RetirementPlanType
dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanServiceCost
us-gaap:RetirementPlanType
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax

us-gaap:DiscontinuedOperationTaxEffectOfDiscontinuedOperation
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:DisposalGroupIncludingDiscontinuedOperationInterestExpense
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:DisposalGroupIncludingDiscontinuedOperationOperatingExpense
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:DisposalGroupIncludingDiscontinuedOperationRevenue
dei:LegalEntity, us-gaap:StatementEquityComponents
us-gaap:DividendsCommonStockCash
us-gaap:StatementEquityComponents
dei:LegalEntity, us-gaap:StatementEquityComponents
us-gaap:DividendsPreferredStockCash

us-gaap:EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate
dei:LegalEntity

us-gaap:EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities
dei:LegalEntity

us-gaap:EffectiveIncomeTaxRateReconciliationOtherAdjustments
dei:LegalEntity

us-gaap:EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
dei:LegalEntity

us-gaap:EffectiveIncomeTaxRateReconciliationTaxCreditsResearch
dei:LegalEntity

us-gaap:FinancingReceivableAllowanceForCreditLossesRecovery
us-gaap:StatementBusinessSegments

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:StatementBusinessSegments
us-gaap:FinancingReceivableSignificantPurchases
us-gaap:StatementBusinessSegments
us-gaap:FinancingReceivableSignificantSales
us-gaap:ForwardContractIndexedToIssuersEquityType
us-gaap:ForwardContractIndexedToIssuersEquityForwardRate

us-gaap:FuelCosts
us-gaap:StatementBusinessSegments
us-gaap:GainLossOnSaleOfNotesReceivable

us-gaap:IncomeLossFromDiscontinuedOperationsNetOfTax
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare

us-gaap:IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare

us-gaap:IncomeLossFromEquityMethodInvestments

us-gaap:IncreaseDecreaseInAccountsAndOtherReceivables
dei:LegalEntity

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
dei:LegalEntity
dei:LegalEntity
us-gaap:IncreaseDecreaseInNotesPayableRelatedParties
dei:LegalEntity, us-gaap:RegulatoryAsset, us-gaap:RetirementPlanName, us-gaap:RetirementPlanType
us-gaap:IncreaseDecreaseInOtherRegulatoryAssets
us-gaap:RegulatoryAsset, us-gaap:RetirementPlanName, us-gaap:RetirementPlanType

us-gaap:IncreaseDecreaseInTimeDeposits

us-gaap:IncrementalCommonSharesAttributableToEquityForwardAgreements

us-gaap:IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends

us-gaap:InterestCostsCapitalizedAdjustment
dei:LegalEntity

us-gaap:InterestExpenseOther
dei:LegalEntity

us-gaap:InterestExpenseRelatedParty
dei:LegalEntity

us-gaap:InvestmentIncomeInterestAndDividend
dei:LegalEntity

us-gaap:LeaseIncome
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:IncomeTaxAuthorityName
us-gaap:LossContingencyDamagesSoughtValue

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax

us-gaap:OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax
us-gaap:StatementEquityComponents

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

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax
dei:LegalEntity

us-gaap:OtherCostAndExpenseOperating

us-gaap:OtherNoncashIncomeExpense
dei:LegalEntity

us-gaap:OtherNonoperatingExpense
dei:LegalEntity

us-gaap:OtherNonoperatingIncome
dei:LegalEntity

us-gaap:PaymentsForProceedsFromOtherInvestingActivities
dei:LegalEntity

us-gaap:PaymentsOfOrdinaryDividends
dei:LegalEntity

us-gaap:PaymentsToAcquireLoansReceivable

us-gaap:PaymentsToAcquireNotesReceivable

us-gaap:PensionAndOtherPostretirementBenefitContributions
dei:LegalEntity
dei:LegalEntity
us-gaap:PreferredStockDividendsAndOtherAdjustments
dei:LegalEntity
us-gaap:ProceedsFromContributedCapital
us-gaap:StatementScenario, us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
us-gaap:ProceedsFromDivestitureOfBusinesses

us-gaap:ProceedsFromIssuanceOfCommonStock
us-gaap:StatementClassOfStock, us-gaap:SubsequentEventType
us-gaap:ProceedsFromIssuanceOfPreferredStockAndPreferenceStock

us-gaap:ProceedsFromMinorityShareholders

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities
dei:LegalEntity

us-gaap:ProceedsFromSaleOfInterestInPartnershipUnit

us-gaap:ProceedsFromSaleOfNotesReceivable
dei:LegalEntity, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:NatureOfExpense
us-gaap:PropertyPlantAndEquipmentGrossPeriodIncreaseDecrease

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

us-gaap:ProvisionForLoanLossesExpensed
us-gaap:StatementBusinessSegments

us-gaap:PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity
dei:LegalEntity
dei:LegalEntity, us-gaap:PublicUtilitiesRegulatoryProceeding
us-gaap:PublicUtilitiesApprovedRateIncreaseDecreaseAmount
dei:LegalEntity, us-gaap:PublicUtilitiesRegulatoryProceeding, us-gaap:StatementScenario
dei:LegalEntity, us-gaap:PublicUtilitiesRegulatoryProceeding
us-gaap:PublicUtilitiesApprovedReturnOnEquityPercentage
dei:LegalEntity, us-gaap:PublicUtilitiesRegulatoryProceeding
us-gaap:PublicUtilitiesRequestedRateIncreaseDecreaseAmendedAmount
us-gaap:ConsolidatedEntities, us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:RepaymentsOfDebt
us-gaap:ConsolidatedEntities, us-gaap:Ownership

us-gaap:RepaymentsOfShortTermDebt
dei:LegalEntity
us-gaap:RestructuringCostAndReserve, us-gaap:RestructuringPlan
us-gaap:RestructuringCharges
us-gaap:StatementEquityComponents
us-gaap:StockRepurchasedDuringPeriodValue

us-gaap:TaxesExcludingIncomeAndExciseTaxes
dei:LegalEntity
us-gaap:UtilitiesOperatingExpense
dei:LegalEntity
us-gaap:UtilitiesOperatingExpenseDepreciationAndAmortization
dei:LegalEntity
us-gaap:UtilitiesOperatingExpenseFuelUsed
dei:LegalEntity
us-gaap:UtilitiesOperatingExpenseGasAndPetroleumPurchased
dei:LegalEntity, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:PublicUtilitiesRegulatoryProceeding
dei:LegalEntity
us-gaap:UtilitiesOperatingExpenseMaintenanceAndOperations
dei:LegalEntity, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:NatureOfExpense
dei:LegalEntity
us-gaap:UtilitiesOperatingExpensePurchasedPower
dei:LegalEntity
us-gaap:UtilitiesOperatingExpenseTaxes
us-gaap:ConsolidatedEntities, us-gaap:Ownership
us-gaap:VariableInterestEntityOwnershipPercentage
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:VariableLeaseIncome

us-gaap:WeightedAverageNumberOfSharesIssuedBasic
dei:LegalEntity, us-gaap:EnvironmentalRemediationSite
cms:AccrualForEnvironmentalLossContingenciesInflationRate
dei:LegalEntity, us-gaap:EnvironmentalRemediationSite, us-gaap:PublicUtility

cms:AccruedRateRefunds
dei:LegalEntity
dei:LegalEntity, us-gaap:PublicUtilitiesRegulatoryProceeding

cms:AmountAvailableForDividendDistribution

cms:AssetsNoncurrentOtherThanPropertyPlantAndEquipment
dei:LegalEntity
us-gaap:ConsolidatedEntities
dei:LegalEntity, us-gaap:PublicUtilitiesRegulatoryProceeding
cms:AuthorizedRecoveryCollection
dei:LegalEntity, us-gaap:PublicUtilitiesRegulatoryProceeding, us-gaap:RegulatoryAsset

cms:DeferredPropertyTaxes
dei:LegalEntity

cms:DeferredTaxAssetsNetOperatingLossAndTaxCreditCarryforwards
dei:LegalEntity

cms:DeferredTaxAssetsOperatingLossAndCreditCarryforwards
dei:LegalEntity

cms:DeferredTaxLiabilitiesPostretirementBenefits
dei:LegalEntity
us-gaap:RetirementPlanName
cms:DefinedContributionPlanTrustAssetsAmount
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
cms:DisposalGroupIncludingDiscontinuedOperationAccountsReceivableAndOtherCurrentAssets
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
cms:DisposalGroupIncludingDiscontinuedOperationCurrentPortionOfLongTermDebt
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
cms:DisposalGroupIncludingDiscontinuedOperationFinancingReceivableAfterAllowanceForCreditLossCurrent
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
cms:DisposalGroupIncludingDiscontinuedOperationFinancingReceivableAfterAllowanceForCreditLossNoncurrent
us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations
cms:DisposalGroupIncludingDiscontinuedOperationLongTermDebtExcludingCurrentMaturities

cms:FinanceLeaseLiabilityAndOtherNoncurrent
dei:LegalEntity
us-gaap:ConsolidatedEntities
cms:InvestmentInSubsidiariesParentOnly

cms:LongTermDebtCurrentMaturitiesLeaseObligationAndOtherFinancingCurrent
dei:LegalEntity

cms:LongTermDebtCurrentMaturitiesLeaseObligationCurrentAndOtherFinancingCurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:FairValueByFairValueHierarchyLevel
cms:NonqualifiedDeferredCompensationPlanAssetsFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel
dei:LegalEntity, us-gaap:FairValueByFairValueHierarchyLevel
cms:NonqualifiedDeferredCompensationPlanLiabilitiesFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:ConsolidatedEntities
cms:NotesPayableIntercompanyPayablesAndRelatedPartyPayables
dei:LegalEntity, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
cms:NotesReceivableRelatedPartiesFairValueDisclosure
dei:LegalEntity, us-gaap:FairValueByMeasurementBasis
dei:LegalEntity, us-gaap:RetirementPlanType
cms:PensionAndOtherPostretirementBenefitPlansRegulatoryAssetsLiabilitiesNetGainsLossesBeforeTax
us-gaap:RetirementPlanType
dei:LegalEntity, us-gaap:RetirementPlanType
cms:PensionAndOtherPostretirementBenefitPlansRegulatoryAssetsLiabilitiesNetPriorServiceCostCreditBeforeTax
us-gaap:RetirementPlanType

cms:PropertyPlantAndEquipmentGrossExcludingCWIP
us-gaap:ConsolidationItems
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dei:LegalEntity

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

us-gaap:DerivativeFairValueOfDerivativeAsset
dei:LegalEntity

us-gaap:DerivativeFairValueOfDerivativeLiability
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us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, us-gaap:StatementBusinessSegments
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation
us-gaap:DerivativeNotionalAmount

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us-gaap:DisposalGroupClassification
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us-gaap:DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNoncurrent

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us-gaap:AwardType

us-gaap:EnergyRelatedInventoryGasStoredUnderground
dei:LegalEntity

us-gaap:EnergyRelatedInventoryOtherFossilFuel
dei:LegalEntity

us-gaap:EquityMethodInvestments
us-gaap:ConsolidatedEntities
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:FinanceLeaseLiability
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us-gaap:FairValueByAssetClass

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dei:LegalEntity

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us-gaap:FairValueByAssetClass

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us-gaap:FairValueByAssetClass

us-gaap:FinanceLeaseLiabilityPaymentsDueNextTwelveMonths
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us-gaap:FairValueByAssetClass

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us-gaap:FairValueByAssetClass

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us-gaap:FairValueByAssetClass

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us-gaap:FairValueByAssetClass

us-gaap:FinanceLeaseLiabilityPaymentsDueYearTwo
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us-gaap:FairValueByAssetClass

us-gaap:FinanceLeaseLiabilityUndiscountedExcessAmount
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us-gaap:FairValueByAssetClass

us-gaap:FinanceLeaseRightOfUseAsset
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us-gaap:PropertyPlantAndEquipmentByType

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dei:LegalEntity

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us-gaap:PropertyPlantAndEquipmentByType
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us-gaap:ConsolidatedEntities
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us-gaap:LossContingenciesByNatureOfContingency

us-gaap:HeldToMaturitySecurities

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us-gaap:StatementBusinessSegments

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us-gaap:FairValueByMeasurementBasis
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us-gaap:IncomeTaxesReceivable
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us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths
dei:LegalEntity

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us-gaap:LessorOperatingLeasePaymentsToBeReceivedTwoYears
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us-gaap:LettersOfCreditOutstandingAmount
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us-gaap:LiabilitiesFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel
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dei:LegalEntity, us-gaap:LineOfCreditFacility
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us-gaap:StatementBusinessSegments
us-gaap:LoansAndLeasesReceivableDeferredIncome

us-gaap:LongTermAccountsNotesAndLoansReceivableNetNoncurrent
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us-gaap:LongTermDebtFairValue
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us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
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us-gaap:ConsolidatedEntities
us-gaap:StatementBusinessSegments

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

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
dei:LegalEntity
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us-gaap:StatementBusinessSegments

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
dei:LegalEntity
us-gaap:ConsolidatedEntities
us-gaap:StatementBusinessSegments

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
dei:LegalEntity
dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:ConsolidatedEntities
us-gaap:StatementBusinessSegments
dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtWeightedAverageInterestRate
dei:LegalEntity, us-gaap:Range, us-gaap:EnvironmentalRemediationSite, us-gaap:PublicUtility
us-gaap:LossContingencyEstimateOfPossibleLoss

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us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments
us-gaap:NotesAndLoansReceivableNetNoncurrent
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:NotesPayableFairValueDisclosure
us-gaap:FairValueByMeasurementBasis
dei:LegalEntity
us-gaap:NotesPayableRelatedPartiesClassifiedCurrent
dei:LegalEntity, us-gaap:CreditFacility
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us-gaap:NotesReceivableFairValueDisclosure
us-gaap:FairValueByMeasurementBasis

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dei:LegalEntity
dei:LegalEntity
us-gaap:NotesReceivableRelatedParties
dei:LegalEntity
us-gaap:NotesReceivableRelatedPartiesCurrent
us-gaap:ConsolidatedEntities
dei:LegalEntity
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us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:StatementBusinessSegments
us-gaap:OffBalanceSheetCreditLossLiability

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent
dei:LegalEntity
dei:LegalEntity, us-gaap:IncomeTaxAuthority
us-gaap:OperatingLossCarryforwards
us-gaap:IncomeTaxAuthority
us-gaap:IncomeTaxAuthority
us-gaap:OperatingLossCarryforwardsValuationAllowance

us-gaap:OtherInventorySupplies
dei:LegalEntity
us-gaap:RestructuringCostAndReserve, us-gaap:RestructuringPlan
us-gaap:OtherLiabilities

us-gaap:OtherShortTermBorrowings
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us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities
us-gaap:RetirementPlanType
dei:LegalEntity
us-gaap:PreferredStockValue
dei:LegalEntity, us-gaap:PublicUtility
us-gaap:PropertyPlantAndEquipmentOther
dei:LegalEntity
us-gaap:PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress
dei:LegalEntity, us-gaap:PublicUtility
us-gaap:PublicUtilitiesPropertyPlantAndEquipmentDistribution
dei:LegalEntity, us-gaap:PublicUtility
us-gaap:PublicUtilitiesPropertyPlantAndEquipmentGenerationOrProcessing
dei:LegalEntity, us-gaap:PublicUtility
us-gaap:PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment
dei:LegalEntity, us-gaap:PublicUtility
us-gaap:PublicUtilitiesPropertyPlantAndEquipmentTransmission
dei:LegalEntity
us-gaap:RegulatoryAssets
dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:RegulatoryAsset, us-gaap:RestructuringCostAndReserve, us-gaap:RestructuringPlan
us-gaap:RetirementPlanType

us-gaap:RegulatoryAssetsCurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:RegulatoryAsset

us-gaap:RegulatoryAssetsNoncurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:EnvironmentalRemediationSite, us-gaap:PublicUtility
dei:LegalEntity, us-gaap:RegulatoryAsset
dei:LegalEntity
us-gaap:RegulatoryLiabilities

us-gaap:RegulatoryLiabilityCurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:RegulatoryLiability

us-gaap:RegulatoryLiabilityNoncurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:RegulatoryLiability

us-gaap:RestrictedCashAndCashEquivalentsAtCarryingValue
dei:LegalEntity
dei:LegalEntity, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:ConsolidatedEntities
us-gaap:FairValueByFairValueHierarchyLevel
dei:LegalEntity, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:RestrictedCashEquivalents
us-gaap:FairValueByFairValueHierarchyLevel
dei:LegalEntity
us-gaap:SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThereafter
dei:LegalEntity
us-gaap:SalesTypeAndDirectFinancingLeasesLeaseReceivableUndiscountedExcessAmount
dei:LegalEntity, us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
us-gaap:AwardType

us-gaap:StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPayments
dei:LegalEntity
us-gaap:StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithoutRegulatoryApproval
dei:LegalEntity, us-gaap:TaxCreditCarryforward
us-gaap:TaxCreditCarryforwardAmount
us-gaap:TaxCreditCarryforward
dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:TransfersAccountedForAsSecuredBorrowingsAssetsCarryingAmount
dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount

us-gaap:UnbilledReceivablesCurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchased
us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary
us-gaap:UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchased
dei:LegalEntity, us-gaap:UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchased
us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary
us-gaap:UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchased
dei:LegalEntity, us-gaap:UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchased
us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary
us-gaap:UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchased
dei:LegalEntity, us-gaap:UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchased
us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary
us-gaap:UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchased
dei:LegalEntity, us-gaap:UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchased
us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary
us-gaap:UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchased
dei:LegalEntity, us-gaap:UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchased
us-gaap:UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
us-gaap:UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchased
dei:LegalEntity, us-gaap:UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchased
us-gaap:UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears
us-gaap:UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchased
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:StatementBusinessSegments
us-gaap:UnusedCommitmentsToExtendCredit
dei:LegalEntity, us-gaap:ValuationAllowancesAndReservesType
us-gaap:ValuationAllowancesAndReservesBalance
us-gaap:ValuationAllowancesAndReservesType
us-gaap:DebtInstrument, us-gaap:LongtermDebtType, us-gaap:StatementBusinessSegments
us-gaap:WeightedAverageRateDomesticDepositBrokered

Plots across concepts


IncomeStatement
Other Comprehensive Income Loss Net Of Tax
Expenses
Income Tax Expense Benefit
Balance Sheet
Operating Lease Liability
Assets
Operating Lease Right Of Use Asset
Current Assets
Other Assets Current
NonCurrent Assets
Operating Lease Right Of Use Asset
PropertyPlantAndEquipmentNet
Accumulated Depreciation Depletion And Amortization Property Plant And Equipment
Liabilities
Operating Lease Liability
Current Liabilities
Operating Lease Liability Current
Noncurrent Liabilities
Operating Lease Liability Noncurrent
Stockholders Equity
Accumulated Other Comprehensive Income Loss Net Of Tax
CashFlow
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInOperatingActivities
Increase Decrease In Inventories
NetCashProvidedByUsedInInvestingActivities
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInFinancingActivities
Net Cash Provided By Used In Financing Activities
Shares
Common Stock Shares Outstanding
OperatingLeaseLiability
Operating Lease Liability Current
NonoperatingIncomeExpense
Investment Income Interest And Dividend
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Payments Due Year Four
AccountsReceivable
Accounts Receivable Gross Current

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:CommonStockValue ██████████████████████████████████████████▁3.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.02.0NANANA
us-gaap:CommonStockSharesOutstanding NANANA286.3286.3286.2283.9283.8283.8283.7283.4283.3283.2282.5281.6281.6281.6280.0279.2279.1279.3279.2277.2277.1276.7276.0275.2275.1275.0268.4266.1266.0265.9265.7264.1263.9263.7257.4254.1252.0251.8250.8249.6NANANA
 us-gaap:CommonStockSharesOutstanding us-gaap:StatementEquityComponents us-gaap:CommonStockNANA288.94NANANA283.864NANANA283.374NANANA281.647NANANA279.206NANANA277.163NANANA275.184NANANA266.137NANANA264.072NANANA254.1NANANANANANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding █▁289.4289.1NA286.9286.5285.2NA284.6284.0283.6NA283.2282.6282.2NA281.6280.3279.9NA279.2279.3277.9NA276.9276.2275.7NA274.7274.6273.0NA272.0272.2270.9NA269.0268.2266.8NA263.9261.9261.7NA254.7247.6NA
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic 289.0NANANA285.5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:EarningsPerShareBasic ▅█▄▅▄▆▄▅▃▅▃▄▄▆▁▅▃▅▃▅▄▄▃▄▂▅▃▃▃▅▃▄▃▄▃▄▃▃▂▄▃▄▂▄▃▃0.611.210.550.760.480.860.590.730.330.750.380.60.490.86-0.010.610.330.710.280.670.450.590.390.530.250.730.350.340.310.770.380.480.30.550.260.560.380.260.160.550.40.540.110.580.350.37
us-gaap:EarningsPerShareDiluted ▅█▄▅▄▆▄▅▃▅▃▄▄▆▁▅▃▅▃▅▄▄▃▄▂▅▃▃▃▅▃▄▃▄▂▄▃▂▂▄▃▄▂▄▃▃0.611.210.550.760.480.850.580.730.330.750.380.590.490.86-0.010.610.330.710.280.670.450.590.380.530.250.730.350.340.30.750.370.460.290.530.250.550.370.250.150.530.380.520.090.530.320.34
us-gaap:IncomeLossFromContinuingOperationsPerBasicShare 5.5e-07NANANA4.5000000000000003e-07NANANANANANANANANANANANANANANANANANA5.3e-072.5e-077.3e-073.500000000000001e-073.4000000000000003e-073.1e-077.7e-073.8e-074.8e-073e-075.5e-072.6e-075.6e-073.8e-072.3000000000000002e-071.6e-075.5e-074.0000000000000003e-075.3e-071.3e-075.8e-074.2e-073.8e-07
us-gaap:IncomeLossFromContinuingOperationsPerDilutedShare 5.5e-07NANANA4.5000000000000003e-07NANANANANANANANANANANANANANANANANANA5.3e-072.5e-077.3e-073.500000000000001e-073.4000000000000003e-073e-077.5e-073.7e-074.6000000000000004e-072.9e-075.3e-072.5e-075.5e-073.7e-072.2e-071.5e-075.3e-073.8e-075.1e-071.1e-075.3e-073.9e-073.5e-07
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
 EBT Margin dei:LegalEntity cms:ConsumersEnergyCompany▂▅▃▂▁▄▃▂▁▅▄▂▂▅▄▂▂▄▃▂▁▄▂▂▁▆▃▁▂█▃▂1493.01937.01665.01450.01330.01744.01670.01429.01334.01943.01712.01502.01395.01855.01686.01437.01362.01737.01550.01498.01293.01723.01439.01417.01281.02028.01672.01359.01387.02382.01674.01386.0NANANANANANANANANANANANANANA
 Net profit Margin dei:LegalEntity cms:ConsumersEnergyCompany▂▅▃▂▁▄▃▂▁▅▄▂▂▅▄▂▂▄▃▂▁▄▂▂▁▆▄▂▂█▄▂▁▅▃▂▁▄▃▂▁▆▃▂▁▅1493.01937.01665.01450.01330.01744.01670.01429.01334.01943.01712.01502.01395.01855.01686.01437.01362.01737.01550.01498.01293.01723.01439.01417.01281.02028.01672.01359.01387.02382.01674.01386.01342.01919.01608.01448.01282.01675.01565.01397.01303.01988.01620.01370.01276.01890.0
 Operating Margin dei:LegalEntity cms:ConsumersEnergyCompany▂▅▃▂▁▄▃▂▁▅▄▂▂▅▄▂▂▄▃▂▁▄▂▂▁▆▄▂▂█▄▂▁▅▃▂▁▄▃▂▁▆▃▂▁▅1493.01937.01665.01450.01330.01744.01670.01429.01334.01943.01712.01502.01395.01855.01686.01437.01362.01737.01550.01498.01293.01723.01439.01417.01281.02028.01672.01359.01387.02382.01674.01386.01342.01919.01608.01448.01282.01675.01565.01397.01303.01988.01620.01370.01276.01890.0
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
 TTM Greenblatt ROC _ _▂█▅▅▃▅▄▅▁▅▂▃▂▅▅▄▂▆▃▆▃▄▂▄▁▆▃▂▂▆▂252.0485.0352.0369.0273.0368.0311.0351.0218.0359.0250.0294.0255.0363.0379.0330.0241.0388.0290.0386.0285.0336.0245.0317.0204.0397.0273.0236.0235.0408.0264.0NANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:ComprehensiveIncomeNetOfTax ▃█▃▄▂▅▃▄▁178.0351.0151.0215.0136.0240.0161.0207.092.0NA104.0171.0139.0NA-6.0173.093.0NA72.0188.0124.0164.0108.0147.067.0203.067.094.084.0205.0NANANANANA150.0102.069.0NA137.0102.0135.0NANANANA
us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest ▃▂█▁▆-5.0-7.04.0-8.01.0NA1.00.01.0NA1.00.01.0NA1.00.01.0NA1.00.01.0NA1.00.01.0NA1.00.01.0NA0.01.01.0NA0.01.01.0NANANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest ▅█▄▅▄▆▄▅▃▅▃▅▄▆▁▅▃▅▃▅▄▄▃▄▂173.0344.0155.0207.0137.0240.0162.0207.093.0212.0105.0171.0140.0241.0-5.0173.094.0200.073.0188.0125.0164.0109.0147.068.0NA68.094.085.0205.0119.0144.079.0145.055.0151.0103.069.0NANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold us-gaap:ProductOrService us-gaap:ElectricityPurchased▄▃▁▇▂▂▁▆▂▃▄█▄▄▃▇391.0377.0343.0430.0362.0357.0349.0413.0356.0378.0391.0447.0393.0382.0371.0426.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold us-gaap:ProductOrService us-gaap:OilAndGasPurchased▂▆▄▁▂▆▅▁▂█▆▁▂█▅▁96.0279.0187.035.082.0273.0224.035.0106.0404.0295.048.0112.0381.0256.047.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:CostsAndExpenses ▃▇▅▂▂▆▅▂▃█▆▃▃▇▄▂▂▅▄▂▁▅▃▂▂█1306.01598.01446.01206.01170.01496.01484.01195.01227.01700.01579.01305.01237.01590.01399.01197.01208.01441.01350.01201.01086.01465.01264.01169.01146.01714.0NANANANANANANANANANANANANANANANANANANANA
us-gaap:IncomeLossFromContinuingOperations 158.0NANANA128.0NANANANANANANANANANANANANANANANANANA148.067.0202.096.094.083.0204.0102.0126.080.0144.067.0148.0100.060.041.0139.0100.0133.031.0134.096.086.0
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest ▃█▃▅▂▅▃▅▁▅▂▃▂▅▄▄▂▆▁▅▃▄▃▄▁▆▂▂▂▆▂▄175.0393.0197.0254.0164.0270.0205.0249.0114.0261.0126.0202.0165.0281.0222.0229.0140.0295.0124.0281.0183.0238.0167.0223.0104.0302.0152.0141.0127.0309.0164.0218.0NANANANANANANANANANANANANANA
us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 153.0NANANA129.0NANANANANANANANANANANANANANANANANANA148.068.0NA97.094.084.0NA102.0127.081.0144.067.0149.0101.060.041.0140.0101.0133.031.0146.0100.089.0
us-gaap:IncomeTaxExpenseBenefit ▁▂▂▂▂▂▂▂▁▂▁▂▁▂█▃▂▄▂▄▃▃▃▃▂▄▂▂▂▄▃▄▂▄▂▄▃▂▁▃▁▃▁▄▃▃22.051.035.044.027.027.037.042.020.048.017.033.025.040.0224.057.047.096.046.095.058.074.060.075.036.0100.055.047.043.0105.062.091.054.095.042.098.067.038.023.081.010.077.017.087.059.061.0
us-gaap:InterestExpense ▆▇███▇▇▇▆▅▅▄▄▄▄▄▄▃▄▄▃▃▁▂▃▂▃▂▂▂▂▂▂▂▂▂▂▂▂▃▃▃▃▂▄▃125.0136.0140.0143.0141.0137.0134.0133.0131.0121.0121.0114.0112.0111.0110.0111.0110.0107.0111.0110.0108.0106.091.0101.0103.0101.0104.0101.0101.0101.099.099.0102.098.096.096.098.099.0102.0104.0104.0105.0107.0102.0117.0105.0
us-gaap:InterestExpenseDebt ▇▇██▇▆▅▅▅▄▄▃▃▃▃▃▃▃▄▃▃▃▂▂▂▂▃▂▃▂▂▂▃▁▁▁▁▁▂▃▃▃▃▂▂▂120.0119.0122.0124.0121.0116.0112.0111.0110.0106.0108.0101.0103.0100.0102.0101.0103.0100.0105.0103.0103.0100.098.095.097.096.099.098.099.097.096.096.099.094.092.092.094.094.098.099.099.0100.0101.097.098.098.0
us-gaap:NetIncomeLoss ▅█▄▅▄▆▄▅▃▅▃▄▄▆▁▄▃▅▃▅▄▄▃▄▂▅▃▃▃▅▃▄▃▄▂▄▃▂▂▄▃▄▂▄▃▃176.0349.0158.0218.0136.0243.0167.0207.093.0213.0108.0169.0139.0241.0-3.0172.092.0199.077.0186.0124.0164.0106.0148.067.0202.096.094.083.0204.0102.0126.080.0144.067.0148.0100.067.041.0139.0100.0135.025.0145.082.088.0
us-gaap:NetIncomeLossAttributableToNoncontrollingInterest ▃▂█▁▆-5.0-7.04.0-8.01.0NA1.00.01.00.01.00.01.00.01.00.01.00.01.00.01.0NA1.00.01.0NA1.00.01.0NA0.01.01.0NA0.01.01.0NA0.01.01.0NA0.01.02.0NA
 us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic dei:LegalEntity cms:ConsumersEnergyCompany▄█▄▅▃▅▅▅▂▅▃▄▃▆▃▄▂▅▂▄▃▄▃▃▁▅▂▂▂▅▂▃▂▃▁▃▂▁▁▃▂▃▁▃▂▂189.0336.0190.0230.0159.0235.0205.0213.097.0226.0130.0180.0151.0242.0135.0181.0103.0211.0116.0195.0131.0172.0134.0160.083.0215.0117.0119.0108.0221.0119.0152.099.0162.078.0162.0121.076.067.0154.091.0153.079.0159.087.0107.0
 us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic dei:LegalEntity,us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments cms:ConsumersEnergyCompany,us-gaap:OperatingSegments,cms:ElectricUtility▄▄▁█▂▂▁█▁154.0155.091.0226.0119.0118.091.0223.090.0NA67.0199.0130.0NA61.0176.094.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic dei:LegalEntity,us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments cms:ConsumersEnergyCompany,us-gaap:OperatingSegments,cms:GasUtility▃█▅▂▃▆▆▁▂36.0181.099.04.041.0117.0114.0-10.08.0NA64.0-19.021.0NA72.05.09.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NonoperatingIncomeExpense ██▄▇▇▇▇▇▇▆▅▆▆▇▂▅▅▆▁▅▅▅▆▅▅▅▄▅▄▅▅▅▅▅▄▅▅▅▄▅▅▅▅▆▆▆48.044.0-15.028.032.039.028.031.027.023.0-3.022.022.029.0-47.010.09.014.0-55.05.06.08.013.07.03.06.0-17.06.0-7.02.0-1.00.05.08.0-7.00.06.09.0-8.09.08.09.0-3.016.014.016.0
us-gaap:OperatingIncomeLoss ▃█▅▆▃▅▄▅▂▅▃▄▃▅▆▅▃▆▄▆▄▅▃▄▂▆▃▃▃▆▃▄▃▅▂▅▃▂▁▄▂▄▁▄▃▃252.0485.0352.0369.0273.0368.0311.0351.0218.0359.0250.0294.0255.0363.0379.0330.0241.0388.0290.0386.0285.0336.0245.0317.0204.0397.0273.0236.0235.0408.0264.0317.0232.0329.0212.0343.0260.0188.0174.0316.0207.0306.0158.0319.0262.0239.0
us-gaap:OtherComprehensiveIncomeLossNetOfTax ██▁▄▆▄▂▆▆▆▃█▆▆▄▇▇▇▃█2.02.0-7.0-3.00.0-3.0-6.00.0-1.0-1.0-4.02.00.00.0-3.01.01.01.0-5.02.0NANANA-1.00.01.0-29.00.01.01.017.017.0-2.01.0-12.02.02.02.0NA-2.02.0NANANANANA
us-gaap:ProfitLoss ▅█▄▅▄▆▄▅▃▅▃▄▄▆▁▅▃▅▃▅▄▄▃▄▂▅▃▃▃▅▃▄▃▄▂▄▃▂▂▄▃▄▂▄▃▃171.0342.0162.0210.0137.0243.0168.0207.094.0213.0109.0169.0140.0241.0-2.0172.093.0199.078.0186.0125.0164.0107.0148.068.0202.097.094.084.0204.0102.0127.081.0144.067.0149.0101.067.041.0140.0101.0135.025.0146.084.088.0
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax ▂▅▄▂▁▄▄▂▁▅▄▂▁▄▄▂▂▄▃▂▁▄▂▂▁▆▄▂▂█▃▂▁▅▃▂▁▃▃▂▁▅▃▂▁▅1515.01962.01798.01468.01343.01758.01795.01442.01347.01957.01829.01519.01413.01873.01778.01527.01449.01829.01640.01587.01371.01801.01509.01486.01350.02111.01758.01430.01468.02523.01736.01445.01406.01979.01670.01507.01333.01743.01620.01464.01364.02055.01682.01443.01340.01967.0
us-gaap:Revenues ▂▅▄▂▂▄▄▂▂▅▄▃▂▅▄▂▂▄▃▂▁▄▂▂▁▆▄▂▂█▃▂▁▅▃▂▁▃▃▂▁▅▃▂▁▅1558.02083.01798.01575.01443.01864.01795.01546.01445.02059.01829.01599.01492.01953.01778.01527.01449.01829.01640.01587.01371.01801.01509.01486.01350.02111.01758.01430.01468.02523.01736.01445.01406.01979.01670.01507.01333.01743.01620.01464.01364.02055.01682.01443.01340.01967.0
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:Assets ████▇▇▆▆▆▅▅▅▅▅▅▄▄▄▄▄▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁29953.029723.029666.029280.028581.027447.026837.026009.025292.024793.024529.023913.023312.022868.023050.022120.021867.021623.021622.020842.020463.020037.020340.019452.019238.019198.019185.018381.017719.017924.017416.016986.017429.017269.017131.016608.016293.016160.016452.015958.015945.015642.015616.0NANANA
 us-gaap:Liabilities us-gaap:ConsolidatedEntities us-gaap:VariableInterestEntityPrimaryBeneficiary█▄▁▆30.025.022.028.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LiabilitiesAndStockholdersEquity ████▇▇▆▆▆▅▅▅▅▅▅▄▄▄▄▄▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁29953.029723.029666.029280.028581.027447.026837.026009.025292.024793.024529.023913.023312.022868.023050.022120.021867.021623.021622.020842.020463.020037.020340.019452.019238.019198.019185.018381.017719.017924.017416.016986.017429.017269.017131.016608.016293.016160.016452.015958.015945.015642.015616.0NANANA
us-gaap:StockholdersEquity ██▇▇▇▇▆▆▆▆▆▆▅▅▅▅▅▅▄▄▄▄▄▄▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▁▁▁5797.05727.05496.05320.05214.05185.05018.04957.04851.04858.04755.04749.04672.04596.04441.04535.04449.04370.04253.04259.04156.04109.03938.03902.03818.03802.03670.03670.03645.03618.03454.03396.03323.03306.03194.03196.03111.03049.03028.03043.02958.02887.02793.0NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:AssetsCurrent ▃▄▃▄█▅▃▃▃▃▃▃▃▂▃▂▂▂▃▂▂▁▃▂▃▄▄▅▃▆▄▃▄▄▃▃▂▃▄▅▆▅▅2322.02513.02404.02494.03532.02817.02331.02305.02254.02376.02468.02374.02286.02207.02475.02121.02211.02215.02280.02198.02031.01890.02320.02123.02291.02501.02597.02734.02465.02969.02526.02401.02485.02528.02422.02360.02206.02268.02565.02860.02956.02741.02759.0NANANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▁▃▁▃█▄▁▂▂▂▁▂▃▁▁▁▃▃▂▂▂▁▂▁▃▃▂▃▂▄▁▂▃▃▁▁▁▂▁▃▅▄▂▄▃▄153.0496.0168.0519.01587.0834.0140.0403.0312.0234.0153.0323.0477.0195.0182.0142.0418.0433.0235.0339.0385.0177.0266.0150.0477.0522.0207.0493.0358.0758.0172.0260.0537.0586.093.0128.0187.0358.0161.0623.0994.0801.0247.0696.0536.0755.0
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents ▂▃▁▃█▄▁▂▂▂▁▂▃▁▁▁▂▂▁▂▂292.0524.0185.0558.01604.0861.0157.0433.0334.0267.0175.0366.0501.0227.0204.0173.0441.0463.0257.0368.0406.0NA288.0NANANA249.0NANANANANANANANANANANANANANANANANANANA
us-gaap:AccountsReceivableNetCurrent ▃▅▅▂▃▆▆▂▃▇▇▃▃██▁▂▄▅▂▁▃▄▂▂▆▆▂▃█▆▂▃▆▅▂▂▃▅▂▃▆▇745.0839.0863.0648.0737.0884.0886.0641.0749.0997.0964.0710.0708.01002.01032.0631.0666.0775.0821.0634.0603.0730.0774.0640.0669.0908.0881.0683.0754.01032.0914.0678.0728.0914.0855.0667.0670.0750.0869.0690.0719.0930.0981.0NANANA
us-gaap:OtherAssetsCurrent ▇▇▅▇█▅▄▄▄▄▅▅▄▅▄▆▅▆▃▄▅▄▃▄▄▄▃▃▅▆▄▃▃▂▂▂▃▂▂▂▁▁▁139.0145.0112.0148.0162.0101.086.086.083.097.0101.0103.093.0101.083.0118.0117.0120.081.094.0102.091.077.087.089.084.072.079.0108.0119.086.068.079.056.053.062.070.050.050.049.037.039.037.0NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:ConstructionInProgressGross ▃▄▅▇▆▄▃▅▄▃▂▄▃▂▂▃▃▃▂▂▁██▇▆▅▅▆▇▆▅▄▅▅▅▅▄▃▃▂▂▁▁832.0928.01085.01439.01222.01032.0896.01143.0973.0822.0763.0948.0787.0708.0765.0881.0802.0798.0761.0698.0612.01451.01509.01310.01191.01141.01106.01211.01339.01206.01149.0943.01108.01135.01080.01134.01011.0899.0783.0672.0644.0627.0570.0NANANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment ██▇▇▇▇▆▆▆▆▆▅▅▅▅▄▄▄▄▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁8326.08178.07953.07845.07697.07563.07360.07264.07130.07236.07037.06909.06808.06682.06510.06403.06311.06206.06056.05953.05922.05878.05747.05697.05633.05545.05415.05321.05242.05168.05087.05355.05278.05200.05121.05047.04973.05008.04901.04869.04802.04731.04646.0NANANA
us-gaap:PropertyPlantAndEquipmentNet ███▇▆▆▆▅▅▅▅▅▄▄▄▄▃▃▃▃▃▂▂▂▁▁▁21533.021207.021039.020630.019436.019144.018926.018524.018106.018315.018126.017790.017237.016904.016761.016444.016119.015857.015715.015443.015187.014907.014705.014160.013775.013526.013412.0NANANA12246.0NANANANANANANANANANANANANANANA
us-gaap:OperatingLeaseRightOfUseAsset NANA34.0NANANA47.049.051.054.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingLeaseRightOfUseAsset dei:LegalEntity cms:ConsumersEnergyCompanyNANA28.0NANANA40.041.044.046.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAssetsNoncurrent ▇██▆▆▆▇▄▄▄▄▅▇▇▇▂▂▂▃▂▂▂▃▂▂▃▃▂▃▃▃▁▂▂▂▁▁▂▂▁▁▂▁819.0873.0869.0688.0707.0723.0739.0492.0519.0538.0478.0629.0779.0789.0799.0269.0294.0321.0353.0258.0285.0315.0384.0288.0319.0354.0352.0335.0362.0392.0409.0233.0259.0283.0293.0217.0240.0268.0276.0203.0234.0252.0245.0NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:AccountsPayableCurrent ▇▄▇▇▆▃▆▅▆▄█▇▆▄█▆▅▃▅▄▄▄▆▅▄▃▇▅▅▆▅▃▃▁▃▃▄▁▅▃▂▁▃659.0538.0671.0662.0629.0490.0622.0598.0627.0544.0723.0680.0623.0534.0725.0624.0599.0479.0598.0539.0559.0534.0633.0586.0558.0512.0678.0604.0587.0632.0585.0519.0512.0426.0512.0491.0527.0409.0575.0484.0444.0413.0492.0NANANA
 us-gaap:DebtCurrent us-gaap:ConsolidatedEntities srt:ParentCompanyNANA200.0NANANA0.0NANANA180.0NANANA225.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LiabilitiesCurrent ▇▆▇▆▇▆▅▃▄▃▅█▅▅▆▄▃▃▅▃▃▃▄▂▂▁▃▂▁▂▃▁▂▂▂▁▂▂▄▄▄▄▃3114.02885.03074.02992.03123.02940.02704.02165.02386.02106.02624.03442.02535.02482.02784.02261.02115.01926.02655.02069.02091.02047.02302.01788.01640.01599.02014.01648.01563.01801.01945.01464.01802.01645.01797.01485.01807.01819.02338.02214.02241.02290.02021.0NANANA
us-gaap:LongTermDebtCurrent ▂▆▆█▇▇▄▄▄▃▄█▅▅▄▄▃▃▃▄▃▃▂▂▁▁▁▂▁▂▂▁▃▂▁▁▂▃▄▄▄572.01500.01486.01800.01700.01700.01111.01100.01100.0821.0974.01900.01200.01300.01081.0959.0819.0790.0864.0984.0897.0929.0684.0720.0498.0521.0519.0669.0418.0645.0541.0511.0737.0711.0519.0488.0631.0814.01033.01116.01099.0NA726.0NANANA
us-gaap:OperatingLeaseLiabilityCurrent NANA9.0NANANA9.09.010.010.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingLeaseLiabilityCurrent dei:LegalEntity cms:ConsumersEnergyCompanyNANA7.0NANANA8.08.08.08.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherLiabilitiesCurrent ▆▅▅█▇▅▇▆▇▄▄▃▂▃█▃▄▃█▅▂▂▄▃▂▂▅▂▃▃▄▃▃▃▄▃▃▃▅▃▂▁▄174.0155.0156.0193.0181.0162.0186.0170.0182.0148.0147.0134.0117.0134.0195.0130.0145.0135.0199.0159.0127.0118.0142.0130.0123.0117.0163.0124.0129.0131.0146.0136.0139.0134.0152.0137.0136.0139.0159.0131.0122.0109.0144.0NANANA
us-gaap:TaxesPayableCurrent ▆▆█▂▆▆█▂▅▅▇▁▄▄▆▁▄▄▆▁▄▄▆▁▄▄▅▁▄▄▅▁▃▃▅▁▃▃▅▁▄▄▅357.0360.0457.0128.0326.0330.0437.0125.0295.0295.0398.0107.0267.0265.0360.090.0256.0260.0348.093.0252.0254.0349.090.0235.0239.0316.089.0225.0225.0297.088.0206.0211.0279.083.0199.0206.0282.0103.0239.0239.0302.0NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:LiabilitiesNoncurrent █████▇▇▇▆▆▆▅▅▅▅▄▄▄▄▄▄▃▄▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁20473.020536.020515.020390.020207.019285.019078.018850.018018.017792.017113.015685.016068.015753.015788.015287.015266.015290.014677.014477.014179.013844.014063.013725.013743.013760.013464.013026.012474.012468.011980.012089.012267.012274.012096.011883.011331.011248.011042.010657.010702.010421.010758.0NANANA
 us-gaap:LongTermDebt dei:LegalEntity,us-gaap:DebtInstrument,us-gaap:LongtermDebtType cms:ConsumersEnergyCompany,cms:PalisadesPowerPurchaseAgreement,cms:FinancingObligationNANA16.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LongTermDebtNoncurrent ▆████▇▆▇▆▆▅▄▄▄▄▄▄▄▃▄▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁11728.013561.013634.013275.013414.012545.011951.012040.011236.011105.010615.08869.09272.08996.09123.09024.09091.09129.08640.08722.08486.08170.08441.07903.08040.08143.08016.08042.07535.07536.07101.07089.06695.06741.06710.06711.06221.06193.06040.06037.06184.05926.06448.0NANANA
us-gaap:DeferredIncomeTaxLiabilitiesNet ██▇▆▆▅▄▄▃▃▃▁▁1966.01926.01863.01821.01763.01722.01655.01588.01548.01544.01487.01382.01344.0NA1269.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent ▁▁▁▂▁▁▄▃▃▃▃▅▄▄▄▄▄▄▄▃▃▃▃▅▅▅▅▂▂▂▂▄███▇▇▇▇▆▆▆▆149.0151.0152.0382.0140.0141.0674.0447.0443.0440.0436.0797.0787.0778.0766.0760.0770.0781.0789.0560.0570.0581.0591.0847.0846.0844.0872.0242.0241.0240.0239.0740.01393.01398.01451.01291.01289.01288.01289.01139.01136.01135.01135.0NANANA
us-gaap:MinorityInterest ████▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁569.0575.0581.0578.037.037.037.037.037.037.037.037.037.037.037.037.037.037.037.037.037.037.037.037.037.037.037.037.037.037.037.037.037.044.044.044.044.044.044.044.044.044.044.0NANANA
us-gaap:OtherLiabilitiesNoncurrent ▆▇▇█▇▇▆▆▅▄▂▂▃▃▃▃▂▂▂▂▃▃▃▂▃▃▂▃▃▃▃▃▃▃▃▃▄▄▄▁▂▂▁382.0397.0398.0429.0413.0395.0383.0373.0364.0345.0294.0295.0305.0307.0307.0308.0289.0295.0290.0283.0301.0314.0313.0299.0304.0304.0299.0307.0303.0307.0306.0316.0316.0311.0311.0323.0336.0328.0336.0265.0278.0288.0267.0NANANA
us-gaap:OperatingLeaseLiabilityNoncurrent NANA25.0NANANA37.039.041.044.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingLeaseLiabilityNoncurrent dei:LegalEntity cms:ConsumersEnergyCompanyNANA21.0NANANA32.033.035.037.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo NANA4.0NANANA11.011.011.011.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo dei:LegalEntity cms:ConsumersEnergyCompanyNANA4.0NANANA9.09.09.010.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree NANA2.0NANANA5.011.011.011.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree dei:LegalEntity cms:ConsumersEnergyCompanyNANA2.0NANANA4.09.09.09.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour NANA1.0NANANA3.05.05.05.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour dei:LegalEntity cms:ConsumersEnergyCompanyNANA1.0NANANA3.04.04.04.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive NANA1.0NANANA2.03.03.03.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive dei:LegalEntity cms:ConsumersEnergyCompanyNANA1.0NANANA2.03.03.02.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive NANA34.0NANANA35.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive dei:LegalEntity cms:ConsumersEnergyCompanyNANA27.0NANANA29.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:StockholdersEquity ██▇▇▇▇▆▆▆▆▆▆▅▅▅▅▅▅▄▄▄▄▄▄▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▁▁▁5797.05727.05496.05320.05214.05185.05018.04957.04851.04858.04755.04749.04672.04596.04441.04535.04449.04370.04253.04259.04156.04109.03938.03902.03818.03802.03670.03670.03645.03618.03454.03396.03323.03306.03194.03196.03111.03049.03028.03043.02958.02887.02793.0NANANA
us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest ██▇▇▆▆▅▅▅▅▅▅▅▅▄▄▄▄▄▄▄▄▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁6366.06302.06077.05898.05251.05222.05055.04994.04888.04895.04792.04786.04709.04633.04478.04572.04486.04407.04290.04296.04193.04146.03975.03939.03855.03839.03707.03707.03682.03655.03491.03433.03360.03350.03238.03240.03155.03093.03072.03087.03002.02931.02837.02866.02993.02941.0
us-gaap:CommonStockValue ██████████████████████████████████████████▁3.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.02.0NANANA
us-gaap:AdditionalPaidInCapitalCommonStock ███▇▆▆▆▆▅▅▅▅▅▅▅▅▅▄▄▄▄▄▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▁▁▁▁▁▁5389.05371.05365.05225.05217.05207.05113.05104.05097.05087.05088.05083.05076.05037.05019.05013.05006.04927.04916.04908.04906.04897.04837.04829.04812.04783.04774.04767.04761.04746.04715.04708.04710.04703.04669.04662.04664.04641.04627.04622.04621.04599.04588.0NANANA
us-gaap:RetainedEarningsAccumulatedDeficit ██▇▇▇▇▆▆▆▆▆▆▅▅▅▅▅▅▅▅▄▄▄▄▄▄▃▃▃▃▃▃▂▂▂▂▂▂▂▂▁▁▁487.0437.0214.0171.070.051.0-25.0-83.0-182.0-166.0-271.0-278.0-346.0-383.0-531.0-434.0-512.0-511.0-616.0-607.0-706.0-744.0-855.0-881.0-949.0-936.0-1058.0-1080.0-1099.0-1110.0-1242.0-1276.0-1334.0-1346.0-1423.0-1426.0-1511.0-1548.0-1553.0-1542.0-1628.0-1675.0-1757.0NANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▁▁▁▂▂▂▂▃▃▃▃▄▄▄▅▅▅▅▅▅▅▅▅▅▅▅▅████▆▄▄▄▆▅▅▅▆▆▆▆-82.0-84.0-86.0-79.0-76.0-76.0-73.0-67.0-67.0-66.0-65.0-59.0-61.0-61.0-50.0-47.0-48.0-49.0-50.0-45.0-47.0-47.0-47.0-49.0-48.0-48.0-49.0-20.0-20.0-21.0-22.0-39.0-56.0-54.0-55.0-43.0-45.0-47.0-49.0-40.0-38.0-40.0-40.0NANANA
 us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax dei:LegalEntity cms:ConsumersEnergyCompany▁▁▁▃▂▂▂▄▄▄▄▃▂▂▅▆▆▆▇▇▇▇▇▆▅▆▆██-35.0-36.0-36.0-27.0-28.0-28.0-28.0-20.0-20.0-21.0-21.0-27.0-29.0-29.0-12.0-8.0-8.0-9.0-3.0-3.0-1.0-3.0-6.0-11.0-12.0-11.0-7.02.02.0NA-2.0-9.0-9.0-6.0-8.0NA-1.0-4.0-2.0NANANA0.0NANANA
us-gaap:MinorityInterest ████▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁569.0575.0581.0578.037.037.037.037.037.037.037.037.037.037.037.037.037.037.037.037.037.037.037.037.037.037.037.037.037.037.037.037.037.044.044.044.044.044.044.044.044.044.044.0NANANA
 us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:StatementEquityComponents us-gaap:AdditionalPaidInCapital▂▂█▁▁▆▁▁▁▁▁▁▃▁▁▁▅▁▁▁▁▄▁▂▂▁▁▁▁▃▁▁▁▂▁▁▂▁▁▁▂▁▁▁▁▁18.015.0140.08.011.0106.010.08.010.07.05.07.039.08.07.07.080.08.08.03.09.070.09.017.029.010.07.07.08.037.07.07.08.029.07.07.023.08.05.07.022.06.07.05.06.04.0
 us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders us-gaap:StatementEquityComponents us-gaap:NoncontrollingInterest1.0NA1.00.01.0NA1.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▅█▁▃▆▂▄▂▆▆▂▂▇▇▅▁▅▆535.0832.0132.0348.0595.0201.0395.0210.0568.0617.0138.0149.0708.0708.0506.080.0473.0646.0NANANANANANANANANANA326.0611.0303.023.0370.0725.0307.0-9.0308.0635.0-26.0-21.0375.0841.0-39.0-50.0391.0657.0
us-gaap:NetCashProvidedByUsedInInvestingActivities ▆█▆▁▅▆▅▄▄▅▄▄▆▇▆▆▇▇-568.0-283.0-569.0-1130.0-609.0-559.0-604.0-802.0-735.0-675.0-791.0-807.0-552.0-456.0-514.0-548.0-460.0-346.0NANANANANANANANANANA-437.0-346.0-528.0-388.0-323.0-293.0-412.0-328.0-297.0-313.0-306.0-281.0-243.0-228.0-277.0-236.0-278.0-212.0
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity cms:ConsumersEnergyCompany▆▆▄▁▇▅▄▄▅▅▅▅▆▇▆▆▇█-472.0-458.0-546.0-707.0-451.0-542.0-554.0-557.0-524.0-502.0-536.0-521.0-470.0-444.0-473.0-476.0-420.0-382.0NANANANANANANANANANA-379.0-315.0-442.0-332.0-318.0-295.0-379.0-299.0-289.0-312.0-268.0-238.0-217.0-228.0-219.0-196.0-242.0-202.0
us-gaap:NetCashProvidedByUsedInFinancingActivities ▁▁▃▁▆█▂▆▄▃▅▅▃▁▃▃▂▂-199.0-210.064.0-264.0757.01062.0-67.0691.0234.0150.0462.0523.0118.0-229.039.0200.0-35.0-94.0NANANANANANANANANANA-289.0321.0137.088.0-96.061.070.0278.0-182.0-125.0-130.0-69.061.0-61.0-133.0446.0-332.0221.0
 us-gaap:NetCashProvidedByUsedInFinancingActivities dei:LegalEntity cms:ConsumersEnergyCompany▄▂▅▁▆█▄▆▅▃▅▄▅▃▄▄▄▃-53.0-384.0225.0-603.0509.0904.0-52.0488.0181.0-109.0360.0126.0222.0-195.0-53.0113.095.0-206.0NANANANANANANANANANA29.0-171.044.0196.0-123.0-68.0-1.0190.0-62.0-281.0-98.0-155.0-108.03.047.0192.0-329.071.0
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect ▄▆▄▁██▄▅▅▅-232.0339.0-373.0-1046.0743.0704.0-276.099.067.092.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect dei:LegalEntity cms:ConsumersEnergyCompany▆▅▅▁██▄▆▆▅34.0-1.0-188.0-1006.0601.0600.0-256.072.0148.08.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:DepreciationDepletionAndAmortization ▅█▆▄▄▇▆▄▄▇▅▄▄▆▄▃▃▆▄▃▃▅▃▃▃▄▃▂▂▄▂▂▂▃▂▂▁▃▂▁▁▂▂▁▁▃244.0340.0281.0228.0223.0316.0263.0215.0216.0298.0244.0206.0204.0279.0229.0193.0197.0262.0214.0183.0176.0238.0186.0173.0169.0222.0182.0153.0151.0199.0165.0145.0137.0181.0158.0138.0130.0172.0142.0120.0122.0162.0140.0133.0131.0172.0
us-gaap:IncreaseDecreaseInInventories ▆▄▅▆▆▄▄▆▆▃▄▇▆▃▄▇▇▃▄▇▆▃▄▇▆▂▄█▇▂▃▇▇▁▃▇▇▂▄█▇▁▃█▇▁132.0-168.0-62.0133.072.0-171.0-93.0147.0111.0-209.0-90.0177.0127.0-228.0-115.0205.0157.0-201.0-111.0163.076.0-274.0-93.0181.0143.0-378.0-125.0269.0237.0-345.0-208.0259.0194.0-447.0-187.0218.0177.0-312.0-92.0310.0258.0-462.0-221.0318.0230.0-460.0
us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet NA-24.061.0100.0-44.03.0-39.0147.0-67.012.0-42.0100.0-114.02.0-100.0165.0-78.0124.0-123.0130.0-65.0101.0-81.0121.0-89.068.0-98.0134.027.0-48.022.0118.013.0-47.027.0113.0NANANANANANANANANANA
 us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet dei:LegalEntity cms:ConsumersEnergyCompanyNA-27.061.0111.0-18.0-18.012.0110.022.0-15.0-27.068.0108.0-48.0-254.0136.0-31.0116.0-95.0104.0-44.084.0-73.051.0-96.0-3.0159.0110.022.0-49.024.0114.015.0-44.024.0120.0NANANANANANANANANANA
us-gaap:NetCashProvidedByUsedInOperatingActivities ▅█▁▃▆▂▄▂▆▆▂▂▇▇▅▁▅▆535.0832.0132.0348.0595.0201.0395.0210.0568.0617.0138.0149.0708.0708.0506.080.0473.0646.0NANANANANANANANANANA326.0611.0303.023.0370.0725.0307.0-9.0308.0635.0-26.0-21.0375.0841.0-39.0-50.0391.0657.0
us-gaap:NetIncomeLoss ▅█▄▅▄▆▄▅▃▅▃▄▄▆▁▄▃▅▃▅▄▄▃▄▂▅▃▃▃▅▃▄▃▄▂▄▃▂▂▄▃▄▂▄▃▃176.0349.0158.0218.0136.0243.0167.0207.093.0213.0108.0169.0139.0241.0-3.0172.092.0199.077.0186.0124.0164.0106.0148.067.0202.096.094.083.0204.0102.0126.080.0144.067.0148.0100.067.041.0139.0100.0135.025.0145.082.088.0
us-gaap:ProfitLoss ▅█▄▅▄▆▄▅▃▅▃▄▄▆▁▅▃▅▃▅▄▄▃▄▂▅▃▃▃▅▃▄▃▄▂▄▃▂▂▄▃▄▂▄▃▃171.0342.0162.0210.0137.0243.0168.0207.094.0213.0109.0169.0140.0241.0-2.0172.093.0199.078.0186.0125.0164.0107.0148.068.0202.097.094.084.0204.0102.0127.081.0144.067.0149.0101.067.041.0140.0101.0135.025.0146.084.088.0
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▆█▆▁▅▆▅▄▄▅▄▄▆▇▆▆▇▇-568.0-283.0-569.0-1130.0-609.0-559.0-604.0-802.0-735.0-675.0-791.0-807.0-552.0-456.0-514.0-548.0-460.0-346.0NANANANANANANANANANA-437.0-346.0-528.0-388.0-323.0-293.0-412.0-328.0-297.0-313.0-306.0-281.0-243.0-228.0-277.0-236.0-278.0-212.0
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity cms:ConsumersEnergyCompany▆▆▄▁▇▅▄▄▅▅▅▅▆▇▆▆▇█-472.0-458.0-546.0-707.0-451.0-542.0-554.0-557.0-524.0-502.0-536.0-521.0-470.0-444.0-473.0-476.0-420.0-382.0NANANANANANANANANANA-379.0-315.0-442.0-332.0-318.0-295.0-379.0-299.0-289.0-312.0-268.0-238.0-217.0-228.0-219.0-196.0-242.0-202.0
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment ▄▄▆█▄▅▅▆▅▅▅▇▄▄▄▄▃▃▄▄▄▄▄▄▃▃▄▄▃▂▄▃▂▂▃▂▂▂▂▁▁▁441.0437.0620.0751.0423.0523.0534.0597.0492.0481.0502.0700.0450.0422.0457.0462.0381.0365.0448.0407.0410.0407.0462.0427.0327.0348.0452.0462.0359.0304.0425.0320.0306.0274.0366.0286.0281.0294.0258.0225.0208.0191.0NANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▁▁▃▁▆█▂▆▄▃▅▅▃▁▃▃▂▂-199.0-210.064.0-264.0757.01062.0-67.0691.0234.0150.0462.0523.0118.0-229.039.0200.0-35.0-94.0NANANANANANANANANANA-289.0321.0137.088.0-96.061.070.0278.0-182.0-125.0-130.0-69.061.0-61.0-133.0446.0-332.0221.0
 us-gaap:NetCashProvidedByUsedInFinancingActivities dei:LegalEntity cms:ConsumersEnergyCompany▄▂▅▁▆█▄▆▅▃▅▄▅▃▄▄▄▃-53.0-384.0225.0-603.0509.0904.0-52.0488.0181.0-109.0360.0126.0222.0-195.0-53.0113.095.0-206.0NANANANANANANANANANA29.0-171.044.0196.0-123.0-68.0-1.0190.0-62.0-281.0-98.0-155.0-108.03.047.0192.0-329.071.0
us-gaap:ProceedsFromIssuanceOfLongTermDebt NANA826.00.01155.01198.075.0621.0462.0993.01723.0250.0544.0250.0525.0185.00.0923.0274.0446.0299.030.0499.00.00.0100.00.0878.00.0550.00.0350.0425.0250.0350.0510.0400.0390.00.00.0375.00.0550.0550.00.0300.0
 us-gaap:ProceedsFromIssuanceOfLongTermDebt dei:LegalEntity cms:ConsumersEnergyCompanyNANA426.00.0655.0873.075.0621.0297.00.01562.00.0NANA300.0185.00.0349.00.0NANANANANANANA0.0NANANA0.0325.0NANA350.0350.0NANA0.0NANANA300.0NANANA
us-gaap:RepaymentsOfLongTermDebt ▁▁▅▆▃▁▂▁▃▆█▁▄▂▃▂▁▄▄▂▁▁▁▁▂▁▃▂▃▁▁▃▄▁▃▂▄▄▂▁▃▁▄▁▃▁16.02.0716.0902.0390.02.0115.066.0314.0790.01165.045.0480.0180.0312.0180.013.0475.0513.0173.012.030.076.011.0126.011.0262.0187.0275.026.036.0260.0435.010.0361.0194.0513.0459.0113.08.0279.013.0442.084.0318.034.0
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value3.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.02.02.0
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 Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding

us-gaap:CommonStockSharesOutstanding


Common
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value286286286283283283283283283283282281281281280279279279279277277276276275275275268266266265265264263263257254252251250249227
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonStockSharesOutstanding us-gaap:StatementEquityComponents

us-gaap:CommonStock


Common
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value288283283281279277275266264254
Percentage of CommonStockSharesOutstanding0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value289289286286285284284283283282282281280279279279277276276275274274273272272270269268266263261261254247
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302020-06-30
Value289285
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.611.210.550.760.480.860.590.730.330.750.380.60.490.86-0.010.610.330.710.280.670.450.590.390.530.250.730.350.340.310.770.380.480.30.550.260.560.380.260.160.550.40.540.110.580.350.37
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.611.210.550.760.480.850.580.730.330.750.380.590.490.86-0.010.610.330.710.280.670.450.590.380.530.250.730.350.340.30.750.370.460.290.530.250.550.370.250.150.530.380.520.090.530.320.34
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Income Loss From Continuing Operations Per Basic Share

us-gaap:IncomeLossFromContinuingOperationsPerBasicShare

us-gaap:IncomeLossFromContinuingOperationsPerBasicShare


Income
Period End2021-06-302020-06-302015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.550.450.530.250.730.350.340.310.770.380.480.30.550.260.560.380.230.160.550.40.530.130.580.420.38
Percentage of IncomeLossFromContinuingOperationsPerBasicShare100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Income Loss From Continuing Operations Per Diluted Share

us-gaap:IncomeLossFromContinuingOperationsPerDilutedShare

us-gaap:IncomeLossFromContinuingOperationsPerDilutedShare


Income
Period End2021-06-302020-06-302015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.550.450.530.250.730.350.340.30.750.370.460.290.530.250.550.370.220.150.530.380.510.110.530.390.35
Percentage of IncomeLossFromContinuingOperationsPerDilutedShare100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value17835115121513624016120792104171139-6.017393721881241641081476720367948420515010269137102135
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.717.98.414.610.113.79.014.46.85.711.39.8-0.311.36.44.411.89.09.17.29.95.09.63.86.65.78.110.07.74.09.47.56.6

Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-12-312014-09-302014-06-302013-12-312013-09-302013-06-302012-12-312012-09-302012-06-30
Value-5000000.0-7000000.04000000.0-8000000.01000000.01000000.001000000.01000000.001000000.01000000.001000000.01000000.001000000.01000000.001000000.01000000.001000000.001000000.01000000.001000000.01000000.0
Percentage of ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.0100.00.0100.0100.00.0100.0100.00.0100.0100.00.0100.00.0100.0100.00.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.3-0.40.2-0.50.10.10.00.10.10.00.10.10.00.10.10.00.10.10.00.10.10.00.10.00.10.10.00.10.1

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value17334415520713724016220793212105171140241-5.0173942007318812516410914768689485205119144791455515110369
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.417.58.614.110.213.79.014.46.910.85.711.39.912.9-0.311.36.510.94.511.89.19.17.29.95.03.96.65.88.16.910.05.67.33.310.07.74.0

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest dei:LegalEntity

cms:ConsumersEnergyCompany


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-03-31
Value19133618223116023519821399226137182152242132181105205175
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest110.497.7117.4111.6116.897.9122.2102.9106.5106.6130.5106.4108.6100.4-2640.0104.6111.7102.5106.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.617.110.115.711.913.411.014.87.311.57.512.010.812.97.411.97.211.29.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany12.817.40.016.012.113.50.014.97.411.70.012.110.913.10.00.00.00.00.0

Cost Of Goods And Services Sold

us-gaap:CostOfGoodsAndServicesSold us-gaap:ProductOrService

us-gaap:CostOfGoodsAndServicesSold

us-gaap:ElectricityPurchased


Cost
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value391377343430362357349413356378391447393382371426
Percentage of CostOfGoodsAndServicesSold100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax25.819.219.129.327.020.319.428.626.419.321.429.427.820.420.927.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ElectricityPurchased0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OilAndGasPurchased


Cost
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value962791873582273224351064042954811238125647
Percentage of CostOfGoodsAndServicesSold24.674.054.58.122.776.564.28.529.8106.975.410.728.599.769.011.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.314.210.42.46.115.512.52.47.920.616.13.27.920.314.43.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OilAndGasPurchased0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Costs And Expenses

us-gaap:CostsAndExpenses

us-gaap:CostsAndExpenses


Costs
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value13061598144612061170149614841195122717001579130512371590139911971208144113501201108614651264116911461714
Percentage of CostsAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax86.281.480.482.287.185.182.782.991.186.986.385.987.584.978.778.483.478.882.375.779.281.383.878.784.981.2

Income Loss From Continuing Operations

us-gaap:IncomeLossFromContinuingOperations

us-gaap:IncomeLossFromContinuingOperations


Income
Period End2021-06-302020-06-302015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1581281486720296948320410212680144671481006041139100133311349686
Percentage of IncomeLossFromContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.49.510.05.09.65.56.65.78.15.98.75.77.34.09.87.53.42.59.57.36.51.89.37.24.4

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

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value175393197254164270205249114261126202165281222229140295124281183238167223104302152141127309164218
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.620.011.017.312.215.411.417.38.513.36.913.311.715.012.515.09.716.17.617.713.313.211.115.07.714.38.69.98.712.29.415.1

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest dei:LegalEntity

cms:ConsumersEnergyCompany


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value224392229285196279254270124280162220179286259243157312183298201254200243128325183184169337193255
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest128.099.7116.2112.2119.5103.3123.9108.4108.8107.3128.6108.9108.5101.8116.7106.1112.1105.8147.6106.0109.8106.7119.8109.0123.1107.6120.4130.5133.1109.1117.7117.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax14.820.012.719.414.615.914.218.79.214.38.914.512.715.314.615.910.817.111.218.814.714.113.316.49.515.410.412.911.513.411.117.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany15.020.30.019.714.816.00.018.99.314.40.014.712.915.50.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest

us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest


Income
Period End2021-06-302020-06-302015-09-302015-06-302014-12-312014-09-302014-06-302013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value15312914868979484102127811446714910160411401011333114610089
Percentage of IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.19.610.05.05.56.65.75.98.85.87.34.09.97.63.42.59.67.46.51.810.17.54.5

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
Value2251354427273742204817332540224574796469558746075361005547431056291549542986738238110.07717875961
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 RevenueFromContractWithCustomerExcludingAssessedTax1.52.61.93.02.01.52.12.91.52.50.92.21.82.112.63.73.25.22.86.04.24.14.05.02.74.73.13.32.94.23.66.33.84.82.56.55.02.21.45.50.73.71.06.04.43.1

us-gaap:IncomeTaxExpenseBenefit dei:LegalEntity

cms:ConsumersEnergyCompany


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
Value3456385536444857265431402744123625310166103698265834411065656011674102671035810780523588549047925362
Percentage of IncomeTaxExpenseBenefit154.5109.8108.6125.0133.3163.0129.7135.7130.0112.5182.4121.2108.0110.054.9108.8112.8105.2143.5108.4119.0110.8108.3110.7122.2110.0118.2138.3139.5110.5119.4112.1124.1108.4138.1109.2119.4136.8152.2108.6540.0116.9276.5105.789.8101.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.22.92.13.72.72.52.74.01.92.81.72.61.92.36.94.13.75.54.06.55.04.64.35.63.35.23.74.54.14.64.37.14.85.23.57.16.03.02.26.04.04.42.86.44.03.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany2.32.90.03.82.72.50.04.02.02.80.02.71.92.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1251361401431411371341331311211211141121111101111101071111101081069110110310110410110110199991029896969899102104104105107102117105
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.36.97.89.710.57.87.59.29.76.26.67.57.95.96.27.37.65.96.86.97.95.96.06.87.64.85.97.16.94.05.76.97.35.05.76.47.45.76.37.17.65.16.47.18.75.3

us-gaap:InterestExpense dei:LegalEntity

cms:ConsumersEnergyCompany


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value78777782827977757471747370726970696868676667546566656564606162606261605961646666676667647868
Percentage of InterestExpense62.456.655.057.358.257.757.556.456.558.761.264.062.564.962.763.162.763.661.360.961.163.259.364.464.164.462.563.459.460.462.660.660.862.262.561.562.264.664.763.564.462.962.662.766.764.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.13.94.35.66.14.54.35.25.53.64.04.85.03.83.94.64.83.74.14.24.83.73.64.44.93.13.74.54.12.43.64.24.43.13.63.94.63.74.14.54.93.24.04.45.83.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany5.24.00.05.76.24.50.05.35.63.70.04.95.03.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Interest Expense Debt

us-gaap:InterestExpenseDebt

us-gaap:InterestExpenseDebt


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value12011912212412111611211111010610810110310010210110310010510310310098959796999899979696999492929494989999100101979898
Percentage of InterestExpenseDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.96.16.88.49.06.66.27.78.25.45.96.67.35.35.76.67.15.56.46.57.55.66.56.47.24.55.66.96.73.85.56.67.04.75.56.17.15.46.06.87.34.96.06.77.35.0

us-gaap:InterestExpenseDebt dei:LegalEntity

cms:ConsumersEnergyCompany


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value73737276777471696869736967676566666666656565646263636362595960586059575658616362636363606063
Percentage of InterestExpenseDebt60.861.359.061.363.663.863.462.261.865.167.668.365.067.063.765.364.166.062.963.163.165.065.365.364.965.663.663.359.660.862.560.460.662.862.060.961.764.964.362.663.663.062.461.961.264.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.83.74.05.25.74.24.04.85.03.54.04.54.73.63.74.34.63.64.04.14.73.64.24.24.73.03.64.34.02.33.54.04.33.03.43.74.43.53.94.24.63.13.74.24.53.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany4.93.80.05.35.84.30.04.85.13.60.04.64.83.60.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value17634915821813624316720793213108169139241-3.017292199771861241641061486720296948320410212680144671481006741139100135251458288
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.617.88.814.910.113.89.314.46.910.95.911.19.812.9-0.211.36.310.94.711.79.09.17.010.05.09.65.56.65.78.15.98.75.77.34.09.87.53.82.59.57.36.61.510.06.14.5

us-gaap:NetIncomeLoss us-gaap:ConsolidationItems

cms:CorporateAndReconcilingItems


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-30
Value-19.0-34.0-58.0-37.0-33.0-26.0-102.0-13.0-15.0-24.0-15.0-26.0-82.0-17.0-18.0
Percentage of NetIncomeLoss-10.8-9.7-36.7-17.0-24.3-10.7-61.1-6.3-16.1-22.2-8.9-18.72733.3-9.9-19.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.3-1.7-3.2-2.5-2.5-1.5-5.7-0.9-1.1-1.3-1.0-1.8-4.6-1.1-1.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:CorporateAndReconcilingItems0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, cms:ElectricUtility


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-30
Value154155912261191189122390671991306117694
Percentage of NetIncomeLoss87.544.457.6103.787.548.654.5107.796.862.0117.893.5-2033.3102.3102.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.27.95.115.48.96.75.115.56.73.713.19.23.411.56.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cms:ElectricUtility13.313.70.018.011.711.50.017.98.80.015.212.00.00.00.0

us-gaap:OperatingSegments, cms:EnerBank


Net
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value3324128.014171110.0
Percentage of NetIncomeLoss9.515.25.55.95.810.25.310.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.71.30.80.60.80.90.80.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cms:EnerBank0.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, cms:Enterprises


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-30
Value5.0142.0131.020157.010.01.04.014-54.08.07.0
Percentage of NetIncomeLoss2.84.01.36.00.78.29.03.410.80.92.410.11800.04.77.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.30.70.10.90.11.10.80.50.70.10.31.0-3.00.50.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cms:Enterprises20.046.70.061.95.9105.30.041.262.50.019.058.30.00.00.0

us-gaap:OperatingSegments, cms:GasUtility


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-30
Value36181994.041117114-10.08.064-19.021725.09.0
Percentage of NetIncomeLoss20.551.962.71.830.148.168.3-4.88.659.3-11.215.1-2400.02.99.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.49.25.50.33.16.76.4-0.70.63.5-1.31.54.00.30.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cms:GasUtility10.822.60.02.113.416.40.0-5.62.60.0-10.17.00.00.00.0

Net Income Loss Attributable To Noncontrolling Interest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-12-312014-09-302014-06-302013-12-312013-09-302013-06-302012-12-312012-09-302012-06-302011-12-312011-09-302011-06-302010-12-312010-09-302010-06-30
Value-5.0-7.04.0-8.01.01.00.01.00.01.00.01.00.01.00.01.00.01.00.01.01.00.01.01.00.01.00.01.01.00.01.01.00.01.01.00.01.02.0
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.0100.00.0100.0100.00.0100.00.0100.0100.00.0100.0100.00.0100.0100.00.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.3-0.40.2-0.50.10.10.00.10.00.10.00.10.00.10.00.10.00.10.00.10.10.00.10.10.00.10.00.10.10.00.10.10.00.10.10.00.10.1

Net Income Loss Available To Common Stockholders Basic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic dei:LegalEntity

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

cms:ConsumersEnergyCompany


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value189336190230159235205213972261301801512421351811032111161951311721341608321511711910822111915299162781621217667154911537915987107
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.517.110.615.711.813.411.414.87.211.57.111.810.712.97.611.97.111.57.112.39.69.68.910.86.110.26.78.37.48.86.910.57.08.24.710.79.14.44.110.56.77.44.711.06.55.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany12.717.40.015.912.013.50.014.97.311.70.012.010.913.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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

cms:ConsumersEnergyCompany, cms:CorporateAndReconcilingItems


Net
Period End2021-06-302020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-30
Value-1.00.00.0-1.00.00.0-1.0-1.00.00.0
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic-0.50.00.0-0.60.00.0-1.0-0.80.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.10.00.0-0.10.00.0-0.1-0.10.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany cms:CorporateAndReconcilingItems0.00.00.00.00.00.00.00.00.00.0

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

cms:ConsumersEnergyCompany, us-gaap:OperatingSegments, cms:ElectricUtility


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-30
Value154155912261191189122390671991306117694
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic81.546.147.998.374.850.244.4104.792.851.5110.686.145.297.291.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.27.95.115.48.96.75.115.56.73.713.19.23.411.56.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany us-gaap:OperatingSegments cms:ElectricUtility13.313.70.018.011.711.50.017.98.80.015.212.00.00.00.0

cms:ConsumersEnergyCompany, us-gaap:OperatingSegments, cms:GasUtility


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-30
Value36181994.041117114-10.08.064-19.021725.09.0
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic19.053.952.11.725.849.855.6-4.78.249.2-10.613.953.32.88.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.49.25.50.33.16.76.4-0.70.63.5-1.31.54.00.30.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany us-gaap:OperatingSegments cms:GasUtility10.822.60.02.113.416.40.0-5.62.60.0-10.17.00.00.00.0

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
Value4844-15.028323928312723-3.0222229-47.010.09.014-55.05.06.08.0137.03.06.0-17.06.0-7.02.0-1.00.05.08.0-7.00.06.09.0-8.09.08.09.0-3.0161416
Percentage of NonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.22.2-0.81.92.42.21.62.12.01.2-0.21.41.61.5-2.60.70.60.8-3.40.30.40.40.90.50.20.3-1.00.4-0.50.1-0.10.00.40.4-0.40.00.50.5-0.50.60.60.4-0.21.11.00.8

us-gaap:NonoperatingIncomeExpense dei:LegalEntity

cms:ConsumersEnergyCompany


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
Value4540-2.0293229232623235.0222024-35.05.04.021-37.09.03.04.08.03.02.011-16.03.02.0-1.0-3.01.02.07.0-11.0-5.03.09.0-5.04.06.09.02.0121213
Percentage of NonoperatingIncomeExpense93.890.913.3103.6100.074.482.183.985.2100.0-166.7100.090.982.874.550.044.4150.067.3180.050.050.061.542.966.7183.394.150.0-28.6-50.0300.00.040.087.5157.10.050.0100.062.544.475.0100.0-66.775.085.781.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.02.0-0.12.02.41.61.31.81.71.20.31.41.41.3-2.00.30.31.1-2.30.60.20.20.50.20.10.5-0.90.20.1-0.0-0.20.10.10.4-0.7-0.30.20.5-0.30.30.40.40.10.80.90.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany3.02.10.02.02.41.70.01.81.71.20.01.51.41.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value252485352369273368311351218359250294255363379330241388290386285336245317204397273236235408264317232329212343260188174316207306158319262239
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.624.719.625.120.320.917.324.316.218.313.719.418.019.421.321.616.621.217.724.320.818.716.221.315.118.815.516.516.016.215.221.916.516.612.722.819.510.810.721.615.214.99.422.119.612.2

us-gaap:OperatingIncomeLoss dei:LegalEntity

cms:ConsumersEnergyCompany


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value257429308338246329308319175328231271229334363308222359288365264317246305192379264245227399258314227319207334260183173305207300191304207224
Percentage of OperatingIncomeLoss102.088.587.591.690.189.499.090.980.391.492.492.289.892.095.893.392.192.599.394.692.694.3100.496.294.195.596.7103.896.697.897.799.197.897.097.697.4100.097.399.496.5100.098.0120.995.379.093.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax17.021.917.123.018.318.717.222.113.016.812.617.816.217.820.420.215.319.617.623.019.317.616.320.514.218.015.017.115.515.814.921.716.116.112.422.219.510.510.720.815.214.611.421.115.411.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany17.222.20.023.418.618.90.022.413.116.90.018.116.518.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Other Comprehensive Income Loss Net Of Tax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-09-302011-06-30
Value2.02.0-7.0-3.00.0-3.0-6.00.0-1.0-1.0-4.02.00.00.0-3.01.01.01.0-5.02.0-1.00.01.0-29.00.01.01.01717-2.01.0-12.02.02.02.0-2.02.0
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.00.0100.0100.00.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.1-0.4-0.20.0-0.2-0.30.0-0.1-0.1-0.20.10.00.0-0.20.10.10.1-0.30.1-0.10.00.0-1.60.00.10.01.01.2-0.10.1-0.70.10.20.1-0.10.1

us-gaap:OtherComprehensiveIncomeLossNetOfTax dei:LegalEntity

cms:ConsumersEnergyCompany


Other
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-06-30
Value1.0-9.01.00.00.0-8.00.01.00.06.02.00.00.0-4.00.01.0-6.00.0-2.02.03.05.01.0-1.0-4.0-9.00.02.02.07.00.0-3.02.0-8.01.03.0-2.00.0
Percentage of OtherComprehensiveIncomeLossNetOfTax50.0128.6-33.30.0-0.0133.30.0-100.0-0.0-150.0100.00.00.0133.30.0100.0-600.0-0.0-100.00.00.00.0-100.00.0-400.031.00.0200.0200.041.20.0150.0200.066.750.0150.0-100.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.1-0.50.10.00.0-0.40.00.10.00.30.10.00.0-0.20.00.1-0.30.0-0.10.10.20.30.1-0.1-0.2-0.50.00.10.10.40.0-0.20.1-0.50.10.2-0.10.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany0.10.00.10.00.00.00.00.10.00.00.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value17134216221013724316820794213109169140241-2.017293199781861251641071486820297948420410212781144671491016741140101135251468488
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.317.49.014.310.213.89.414.47.010.96.011.19.912.9-0.111.36.410.94.811.79.19.17.110.05.09.65.56.65.78.15.98.85.87.34.09.97.63.82.59.67.46.61.510.16.34.5

us-gaap:ProfitLoss dei:LegalEntity

cms:ConsumersEnergyCompany


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1903361912301602352062139822613118015224213618110421111719513217213516084215118119109221119153100162781631227667155921537916088107
Percentage of ProfitLoss111.198.2117.9109.5116.896.7122.6102.9104.3106.1120.2106.5108.6100.4-6800.0105.2111.8106.0150.0104.8105.6104.9126.2108.1123.5106.4121.6126.6129.8108.3116.7120.5123.5112.5116.4109.4120.8113.4163.4110.791.1113.3316.0109.6104.8121.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.517.110.615.711.913.411.514.87.311.57.211.810.812.97.611.97.211.57.112.39.69.68.910.86.210.26.78.37.48.86.910.67.18.24.710.89.24.44.110.66.77.44.711.16.65.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany12.817.40.015.912.113.50.014.97.411.70.012.010.913.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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

cms:ConsumersEnergyCompany, us-gaap:RetainedEarnings


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1903361912301602352062139822613118015224213618110421111719513217213516084215118119109221119153100162781631227667155921537916088107
Percentage of ProfitLoss111.198.2117.9109.5116.896.7122.6102.9104.3106.1120.2106.5108.6100.4-6800.0105.2111.8106.0150.0104.8105.6104.9126.2108.1123.5106.4121.6126.6129.8108.3116.7120.5123.5112.5116.4109.4120.8113.4163.4110.791.1113.3316.0109.6104.8121.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.517.110.615.711.913.411.514.87.311.57.211.810.812.97.611.97.211.57.112.39.69.68.910.86.210.26.78.37.48.86.910.67.18.24.710.89.24.44.110.66.77.44.711.16.65.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ProfitLoss us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-09-302017-06-30
Value-5.0-7.04.0-8.01.01.00.01.01.00.01.00.01.0
Percentage of ProfitLoss-2.9-2.02.5-3.80.70.60.01.10.90.00.70.01.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.3-0.40.2-0.50.10.10.00.10.10.00.10.00.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-06-302011-03-312010-06-302010-03-31
Value1763491582181362431672079321310816913924117292199186124164148672029483204144100671001358288
Percentage of ProfitLoss102.9102.097.5103.899.3100.099.4100.098.9100.099.1100.099.3100.0100.098.9100.0100.099.2100.0100.098.5100.0100.098.8100.0100.099.0100.099.0100.097.6100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.617.88.814.910.113.89.314.46.910.95.911.19.812.911.36.310.911.79.09.110.05.09.66.65.78.17.37.53.87.36.66.14.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1515196217981468134317581795144213471957182915191413187317781527144918291640158713711801150914861350211117581430146825231736144514061979167015071333174316201464136420551682144313401967
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax dei:LegalEntity

cms:ConsumersEnergyCompany


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value14901932164514471326173916351425133119381674149813891849
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax98.398.591.598.698.798.991.198.898.899.091.598.698.398.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax98.398.591.598.698.798.991.198.898.899.091.598.698.398.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax dei:LegalEntity, us-gaap:ConsolidationItems, us-gaap:ProductOrService, us-gaap:StatementBusinessSegments

cms:ConsumersEnergyCompany, us-gaap:OperatingSegments, cms:CommercialUtilityService, cms:ElectricUtility


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value390345351413341339362427362351364434386361
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax25.717.619.528.125.419.320.229.626.917.919.928.627.319.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax25.717.619.528.125.419.320.229.626.917.919.928.627.319.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany us-gaap:OperatingSegments cms:CommercialUtilityService cms:ElectricUtility100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cms:ConsumersEnergyCompany, us-gaap:OperatingSegments, cms:CommercialUtilityService, cms:GasUtility


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value59163110275114911327581741173058162
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.98.36.11.83.88.56.31.94.38.96.42.04.18.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.98.36.11.83.88.56.31.94.38.96.42.04.18.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany us-gaap:OperatingSegments cms:CommercialUtilityService cms:GasUtility100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cms:ConsumersEnergyCompany, us-gaap:OperatingSegments, cms:IndustrialUtilityService, cms:ElectricUtility


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value153138143161126140158175174162175186170143
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.17.08.011.09.48.08.812.112.98.39.612.212.07.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.17.08.011.09.48.08.812.112.98.39.612.212.07.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany us-gaap:OperatingSegments cms:IndustrialUtilityService cms:ElectricUtility100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cms:ConsumersEnergyCompany, us-gaap:OperatingSegments, cms:IndustrialUtilityService, cms:GasUtility


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value8.023145.07.020153.08.025184.09.024
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.51.20.80.30.51.10.80.20.61.31.00.30.61.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.51.20.80.30.51.10.80.20.61.31.00.30.61.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany us-gaap:OperatingSegments cms:IndustrialUtilityService cms:GasUtility100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cms:ConsumersEnergyCompany, us-gaap:OperatingSegments, cms:OtherUtilityService, cms:ElectricUtility


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value5480575746655760676468655671
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.64.13.23.93.43.73.24.25.03.33.74.34.03.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.64.13.23.93.43.73.24.25.03.33.74.34.03.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany us-gaap:OperatingSegments cms:OtherUtilityService cms:ElectricUtility100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cms:ConsumersEnergyCompany, us-gaap:OperatingSegments, cms:OtherUtilityService, cms:GasUtility


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value4561604042525537415049364150
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.03.13.32.73.13.03.12.63.02.62.72.42.92.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.03.13.32.73.13.03.12.63.02.62.72.42.92.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany us-gaap:OperatingSegments cms:OtherUtilityService cms:GasUtility100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cms:ConsumersEnergyCompany, us-gaap:OperatingSegments, cms:ResidentialUtilityServices, cms:ElectricUtility


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value561568497624507481457585423523448625475501
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax37.029.027.642.537.827.425.540.631.426.724.541.133.626.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax37.029.027.642.537.827.425.540.631.426.724.541.133.626.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany us-gaap:OperatingSegments cms:ResidentialUtilityServices cms:ElectricUtility100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cms:ConsumersEnergyCompany, us-gaap:OperatingSegments, cms:ResidentialUtilityServices, cms:GasUtility


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value220554413120206493418111198589435118194537
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax14.528.223.08.215.328.023.37.714.730.123.87.813.728.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax14.528.223.08.215.328.023.37.714.730.123.87.813.728.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany us-gaap:OperatingSegments cms:ResidentialUtilityServices cms:GasUtility100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

cms:ConsumersEnergyCompany, us-gaap:OperatingSegments, cms:ElectricUtility


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value11581131104812551020102510341247102611001055131010871076
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax76.457.658.385.575.958.357.686.576.256.257.786.276.957.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax76.457.658.385.575.958.357.686.576.256.257.786.276.957.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany us-gaap:OperatingSegments cms:ElectricUtility100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cms:ConsumersEnergyCompany, us-gaap:OperatingSegments, cms:GasUtility


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value332801597192306714601178305838619188302773
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.940.833.213.122.840.633.512.322.642.833.812.421.441.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.940.833.213.122.840.633.512.322.642.833.812.421.441.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany us-gaap:OperatingSegments cms:GasUtility100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax dei:LegalEntity, us-gaap:ProductOrService

cms:ConsumersEnergyCompany, cms:CommercialUtilityService


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value449508461440392488475454420525481464444523
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax29.625.925.630.029.227.826.531.531.226.826.330.531.427.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax29.625.925.630.029.227.826.531.531.226.826.330.531.427.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany cms:CommercialUtilityService100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cms:ConsumersEnergyCompany, cms:IndustrialUtilityService


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value161161157166133160173178182187193190179167
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.68.28.711.39.99.19.612.313.59.610.612.512.78.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.68.28.711.39.99.19.612.313.59.610.612.512.78.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany cms:IndustrialUtilityService100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cms:ConsumersEnergyCompany, cms:OtherUtilityService


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value9914111797881171129710811411710197121
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.57.26.56.66.66.76.26.78.05.86.46.66.96.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.57.26.56.66.66.76.26.78.05.86.46.66.96.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany cms:OtherUtilityService100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cms:ConsumersEnergyCompany, cms:ResidentialUtilityServices


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value781112291074471397487569662111128837436691038
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax51.657.250.650.753.155.448.748.346.156.848.348.947.355.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax51.657.250.650.753.155.448.748.346.156.848.348.947.355.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany cms:ResidentialUtilityServices100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:OperatingSegments, cms:OtherUtilityService, cms:Enterprises


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2530242117192217161923212424
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.71.51.31.41.31.11.21.21.21.01.31.41.71.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.71.51.31.41.31.11.21.21.21.01.31.41.71.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cms:OtherUtilityService cms:Enterprises100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, cms:ElectricUtility


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value11581131104812551020102510341247102611001055131010871076
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax76.457.658.385.575.958.357.686.576.256.257.786.276.957.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax76.457.658.385.575.958.357.686.576.256.257.786.276.957.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cms:ElectricUtility100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cms:Enterprises


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2530242117192217161923212424
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.71.51.31.41.31.11.21.21.21.01.31.41.71.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.71.51.31.41.31.11.21.21.21.01.31.41.71.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cms:Enterprises100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cms:GasUtility


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value332801597192306714601178305838619188302773
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.940.833.213.122.840.633.512.322.642.833.812.421.441.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax21.940.833.213.122.840.633.512.322.642.833.812.421.441.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cms:GasUtility100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService

cms:OtherUtilityService


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2530242117192217161923212424
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.71.51.31.41.31.11.21.21.21.01.31.41.71.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.71.51.31.41.31.11.21.21.21.01.31.41.71.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:OtherUtilityService100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenues

us-gaap:Revenues

us-gaap:Revenues


Revenues
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1558208317981575144318641795154614452059182915991492195317781527144918291640158713711801150914861350211117581430146825231736144514061979167015071333174316201464136420551682144313401967
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax102.8106.2100.0107.3107.4106.0100.0107.2107.3105.2100.0105.3105.6104.3100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Revenues dei:LegalEntity

cms:ConsumersEnergyCompany


Revenuesdei:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1493193716651450133017441670142913341943171215021395185516861437136217371550149812931723143914171281202816721359138723821674138613421919160814481282167515651397130319881620137012761890
Percentage of Revenues95.893.092.692.192.293.693.092.492.394.493.693.993.595.094.894.194.095.094.594.494.395.795.495.494.996.195.195.094.594.496.495.995.497.096.396.196.296.196.695.495.596.796.394.995.296.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax98.598.792.698.899.099.293.099.199.099.393.698.998.799.094.894.194.095.094.594.494.395.795.495.494.996.195.195.094.594.496.495.995.497.096.396.196.296.196.695.495.596.796.394.995.296.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany100.2100.3101.2100.2100.3100.3102.1100.3100.2100.3102.3100.3100.4100.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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

cms:ConsumersEnergyCompany, us-gaap:OperatingSegments, cms:ElectricUtility


Revenuesdei:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value11601134106512571022102810591250102711031081131310891078108812471077
Percentage of Revenues74.554.459.279.870.855.259.080.971.153.659.182.173.055.261.281.774.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax76.657.859.285.676.158.559.086.776.256.459.186.477.157.661.281.774.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany us-gaap:OperatingSegments cms:ElectricUtility100.2100.3101.6100.2100.2100.3102.4100.2100.1100.3102.5100.2100.2100.20.00.00.0

cms:ConsumersEnergyCompany, us-gaap:OperatingSegments, cms:GasUtility


Revenuesdei:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value333803600193308716611179307840631189306777598190285
Percentage of Revenues21.438.633.412.321.338.434.011.621.240.834.511.820.539.833.612.419.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax22.040.933.413.122.940.734.012.422.842.934.512.421.741.533.612.419.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany us-gaap:OperatingSegments cms:GasUtility100.3100.2100.5100.5100.7100.3101.7100.6100.7100.2101.9100.5101.3100.50.00.00.0

us-gaap:Revenues dei:LegalEntity, us-gaap:RealEstateAndAccumulatedDepreciationDescriptionOfProperty, us-gaap:NatureOfExpense

cms:ConsumersEnergyCompany, cms:RayCompressorStation, cms:InsuranceRecoveries


Revenuesdei:
Period End2021-06-302021-03-31
Value0.03.0
Percentage of Revenues0.00.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany cms:RayCompressorStation cms:InsuranceRecoveries0.00.0

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

us-gaap:OperatingSegments, cms:ElectricUtility


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value11601134106512571022102810591250102711031081131310891078108812471077
Percentage of Revenues74.554.459.279.870.855.259.080.971.153.659.182.173.055.261.281.774.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax76.657.859.285.676.158.559.086.776.256.459.186.477.157.661.281.774.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cms:ElectricUtility100.2100.3101.6100.2100.2100.3102.4100.2100.1100.3102.5100.2100.2100.20.00.00.0

us-gaap:OperatingSegments, cms:EnerBank


Revenuesus-gaap:
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value707168616261585349
Percentage of Revenues3.43.94.34.23.33.43.83.72.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.63.94.64.53.53.44.03.92.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cms:EnerBank0.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, cms:Enterprises


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value6576625752586459586771576163575855
Percentage of Revenues4.23.63.43.63.63.13.63.84.03.33.93.64.13.23.23.83.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.33.93.43.93.93.33.64.14.33.43.93.84.33.43.23.83.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cms:Enterprises260.0253.3258.3271.4305.9305.3290.9347.1362.5352.6308.7271.4254.2262.50.00.00.0

us-gaap:OperatingSegments, cms:GasUtility


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value333803600193308716611179307840631189306777598190285
Percentage of Revenues21.438.633.412.321.338.434.011.621.240.834.511.820.539.833.612.419.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax22.040.933.413.122.940.734.012.422.842.934.512.421.741.533.612.419.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cms:GasUtility100.3100.2100.5100.5100.7100.3101.7100.6100.7100.2101.9100.5101.3100.50.00.00.0

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
Value2995329723296662928028581274472683726009252922479324529239132331222868230502212021867216232162220842204632003720340194521923819198191851838117719179241741616986174291726917131166081629316160164521595815945156421561615256
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets dei:LegalEntity

cms:ConsumersEnergyCompany


Assetsdei:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value2568025280253992483625060242062369922938224162205222025214922128320949210992038020205198241994618980187021842218658179771786717854178471691916387163121617916094164091627216275158041555415267156621505815101149571483914622
Percentage of Assets85.785.185.684.887.788.288.388.288.688.989.889.991.391.691.592.192.491.792.291.191.491.991.792.492.993.093.092.092.591.092.994.794.194.295.095.295.594.595.294.494.795.695.095.8
Percentage of Assets85.785.185.684.887.788.288.388.288.688.989.889.991.391.691.592.192.491.792.291.191.491.991.792.492.993.093.092.092.591.092.994.794.194.295.095.295.594.595.294.494.795.695.095.8
Percentage of Assets cms:ConsumersEnergyCompany100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

cms:ConsumersEnergyCompany, cms:CorporateAndReconcilingItems


Assetsdei:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value211929192122202220232922215370
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.10.10.20.3
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.10.10.20.3
Percentage of Assets cms:ConsumersEnergyCompany cms:CorporateAndReconcilingItems100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

cms:ConsumersEnergyCompany, us-gaap:OperatingSegments, cms:ElectricUtility


Assetsdei:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value161411596915893156211598715459149731455714459143001414313914140751390713430
Percentage of Assets53.953.753.653.455.956.355.856.057.257.757.758.260.460.362.1
Percentage of Assets53.953.753.653.455.956.355.856.057.257.757.758.260.460.362.1
Percentage of Assets cms:ConsumersEnergyCompany us-gaap:OperatingSegments cms:ElectricUtility100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cms:ConsumersEnergyCompany, us-gaap:OperatingSegments, cms:GasUtility


Assetsdei:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value951892929477919690528725870683597937772978537556718771396446
Percentage of Assets31.831.331.931.431.731.832.432.131.431.232.031.630.831.029.8
Percentage of Assets31.831.331.931.431.731.832.432.131.431.232.031.630.831.029.8
Percentage of Assets cms:ConsumersEnergyCompany us-gaap:OperatingSegments cms:GasUtility100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidatedEntities

srt:ParentCompany


Assetsus-gaap:
Period End2020-12-312019-12-312018-12-312017-12-31
Value9883870279797645
Percentage of Assets33.332.432.533.2
Percentage of Assets33.332.432.533.2
Percentage of Assets srt:ParentCompany100.0100.0100.0100.0

us-gaap:VariableInterestEntityPrimaryBeneficiary


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-30
Value700704705712
Percentage of Assets2.32.42.42.4
Percentage of Assets2.32.42.42.4
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidationItems

cms:CorporateAndReconcilingItems


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value3139225232013091794827022484235121042012172916631478
Percentage of Assets10.50.80.10.71.10.70.210.49.89.58.68.47.47.26.8
Percentage of Assets10.50.80.10.71.10.70.210.49.89.58.68.47.47.26.8
Percentage of Assets cms:CorporateAndReconcilingItems100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, cms:ElectricUtility


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value160781590615829155561592515397149111449514396142371407913850140751390613429
Percentage of Assets53.753.553.453.155.756.155.655.756.957.457.457.960.460.362.1
Percentage of Assets53.753.553.453.155.756.155.655.756.957.457.457.960.460.362.1
Percentage of Assets us-gaap:OperatingSegments cms:ElectricUtility100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cms:EnerBank


Assetsus-gaap:
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-312017-12-31
Value30733109312527992640269220061453
Percentage of Assets10.310.510.79.89.610.08.26.3
Percentage of Assets10.310.510.79.89.610.08.26.3
Percentage of Assets us-gaap:OperatingSegments cms:EnerBank100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cms:Enterprises


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value1266127512761250542553527500522524540538321342269
Percentage of Assets4.24.34.34.31.92.02.01.92.12.12.22.21.41.51.2
Percentage of Assets4.24.34.34.31.92.02.01.92.12.12.22.21.41.51.2
Percentage of Assets us-gaap:OperatingSegments cms:Enterprises100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, cms:GasUtility


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value947092449429914890068678865983127890768178067513718771396446
Percentage of Assets31.631.131.831.231.531.632.332.031.231.031.831.430.831.029.8
Percentage of Assets31.631.131.831.231.531.632.332.031.231.031.831.430.831.029.8
Percentage of Assets us-gaap:OperatingSegments cms:GasUtility100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities us-gaap:ConsolidatedEntities

us-gaap:Liabilities

us-gaap:VariableInterestEntityPrimaryBeneficiary


Liabilitiesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-30
Value30252228
Percentage of Liabilities100.0100.0100.0100.0
Percentage of Assets0.10.10.10.1
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary4.33.63.13.9

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value2995329723296662928028581274472683726009252922479324529239132331222868230502212021867216232162220842204632003720340194521923819198191851838117719179241741616986174291726917131166081629316160164521595815945156421561615256
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilitiesAndStockholdersEquity dei:LegalEntity

cms:ConsumersEnergyCompany


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value25680252802539924836250602420623699229382241622052220252149221283209492109920380202051982419946189801870218422186581797717867178541784716919163871631216179160941640916272162751580415554152671566215058151011495714839
Percentage of LiabilitiesAndStockholdersEquity85.785.185.684.887.788.288.388.288.688.989.889.991.391.691.592.192.491.792.291.191.491.991.792.492.993.093.092.092.591.092.994.794.194.295.095.295.594.595.294.494.795.695.0
Percentage of Assets85.785.185.684.887.788.288.388.288.688.989.889.991.391.691.592.192.491.792.291.191.491.991.792.492.993.093.092.092.591.092.994.794.194.295.095.295.594.595.294.494.795.695.0
Percentage of Assets cms:ConsumersEnergyCompany100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LiabilitiesAndStockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Liabilities
Period End2020-12-312019-12-312018-12-312017-12-31
Value9883870279797645
Percentage of LiabilitiesAndStockholdersEquity33.332.432.533.2
Percentage of Assets33.332.432.533.2
Percentage of Assets srt:ParentCompany100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value57975727549653205214518550184957485148584755474946724596444145354449437042534259415641093938390238183802367036703645361834543396332333063194319631113049302830432958288727932602
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets19.419.318.518.218.218.918.719.119.219.619.419.920.020.119.320.520.320.219.720.420.320.519.420.119.819.819.120.020.620.219.820.019.119.118.619.219.118.918.419.118.618.517.917.1

us-gaap:StockholdersEquity dei:LegalEntity

cms:ConsumersEnergyCompany


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value8940872985198526846880667700769976107287688368866851667664516495642562095902592458795679550954855429547952405214521350584820480047544759453845594540445943504367430943104136
Percentage of StockholdersEquity154.2152.4155.0160.3162.4155.6153.4155.3156.9150.0144.8145.0146.6145.3145.3143.2144.4142.1138.8139.1141.5138.2139.9140.6142.2144.1142.8142.1143.0139.8139.5141.3143.1144.0142.1142.6145.9146.2143.7143.5145.7149.3148.1
Percentage of Assets29.829.428.729.129.629.428.729.630.129.428.128.829.429.228.029.429.428.727.328.428.728.327.128.228.228.527.328.429.428.227.728.327.327.626.527.527.927.626.427.427.027.626.5
Percentage of Assets cms:ConsumersEnergyCompany34.834.533.534.333.833.332.533.633.933.031.332.032.231.930.631.931.831.329.631.231.430.829.530.530.430.729.430.831.831.029.829.829.029.227.928.829.229.227.829.028.528.827.9

us-gaap:StockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Stockholders
Period End2020-12-312019-12-31
Value54965018
Percentage of StockholdersEquity100.0100.0
Percentage of Assets18.518.7
Percentage of Assets srt:ParentCompany55.657.7

Assets Current

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value23222513240424943532281723312305225423762468237422862207247521212211221522802198203118902320212322912501259727342465296925262401248525282422236022062268256528602956274127592742
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets7.88.58.18.512.410.38.78.98.99.610.19.99.89.710.79.610.110.210.510.59.99.411.410.911.913.013.514.913.916.614.514.114.314.614.114.213.514.015.617.918.517.517.718.0

us-gaap:AssetsCurrent dei:LegalEntity

cms:ConsumersEnergyCompany


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value1719166018921816277022031872186517591794198017451825176619751790191217461942164715641549192918262038220822732256204922362157224421532216225522272110201624072563267926002519
Percentage of AssetsCurrent74.066.178.772.878.478.280.380.978.075.580.273.579.880.079.884.486.578.885.274.977.082.083.186.089.088.387.582.583.175.385.493.586.687.793.194.495.688.993.889.690.694.991.3
Percentage of Assets5.75.66.46.29.78.07.07.27.07.28.17.37.87.78.68.18.78.19.07.97.67.79.59.410.611.511.812.311.612.512.413.212.412.813.213.413.012.514.616.116.816.616.1
Percentage of Assets cms:ConsumersEnergyCompany6.76.67.47.311.19.17.98.17.88.19.08.18.68.49.48.89.58.89.78.78.48.410.310.211.412.412.713.312.513.713.313.913.113.613.914.113.613.215.417.017.717.417.0

us-gaap:AssetsCurrent us-gaap:ConsolidatedEntities

srt:ParentCompany


Assets
Period End2020-12-312019-12-312018-12-312017-12-31
Value4103080147
Percentage of AssetsCurrent17.11.33.25.9
Percentage of Assets1.40.10.30.6
Percentage of Assets srt:ParentCompany4.10.31.01.9

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value15349616851915878341404033122341533234771951821424184332353393851772661504775222074933587581722605375869312818735816162399480124769653675590207344
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.51.70.61.85.63.00.51.51.20.90.61.42.00.90.80.61.92.01.11.61.90.91.30.82.52.71.12.72.04.21.01.53.13.40.50.81.12.21.03.96.25.11.60.00.00.00.60.00.0

us-gaap:CashAndCashEquivalentsAtCarryingValue dei:LegalEntity

cms:ConsumersEnergyCompany


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value529.02019912156041125919637399.02541154455343182131211172750433974257120098178181992863555.05715417385373766713712333205913969
Percentage of CashAndCashEquivalentsAtCarryingValue34.01.811.938.376.672.47.964.362.815.825.52.853.259.024.238.782.142.055.76.230.415.318.828.783.281.434.340.627.423.510.576.553.360.65.444.582.448.352.859.977.189.028.733.559.778.343.333.3
Percentage of Assets0.20.00.10.74.32.20.01.00.80.10.20.01.10.50.20.21.60.80.60.10.60.10.20.22.12.20.41.10.61.00.11.21.62.10.00.30.91.10.52.34.84.60.50.00.00.00.30.0
Percentage of Assets cms:ConsumersEnergyCompany0.20.00.10.84.82.50.01.10.90.20.20.01.20.50.20.31.70.90.70.10.60.10.30.22.22.40.41.20.61.10.11.21.72.20.00.41.01.10.52.55.14.80.50.00.00.00.30.0

us-gaap:CashAndCashEquivalentsAtCarryingValue us-gaap:ConsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary


Cash
Period End2021-06-302021-03-312020-12-312020-09-30
Value128.07.03.0
Percentage of CashAndCashEquivalentsAtCarryingValue7.81.64.20.6
Percentage of Assets0.00.00.00.0
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary1.71.11.00.4

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312014-12-31
Value2925241855581604861157433334267175366501227204173441463257368406288249
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.01.80.61.95.63.10.61.71.31.10.71.52.11.00.90.82.02.11.21.82.01.41.3

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents dei:LegalEntity

cms:ConsumersEnergyCompany


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312014-12-31
Value68343522312296282828421264563827614665853642121525013771112
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents23.36.518.940.076.672.917.865.663.524.032.010.455.164.331.949.182.545.859.113.633.724.745.0
Percentage of Assets0.20.10.10.84.32.30.11.10.80.30.20.21.20.60.30.41.71.00.70.20.70.30.6
Percentage of Assets cms:ConsumersEnergyCompany0.30.10.10.94.92.60.11.20.90.30.30.21.30.70.30.41.81.10.80.30.70.40.6

Accounts Receivable Net Current

us-gaap:AccountsReceivableNetCurrent

us-gaap:AccountsReceivableNetCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value745839863648737884886641749997964710708100210326316667758216346037307746406699088816837541032914678728914855667670750869690719930981948
Percentage of AccountsReceivableNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.52.82.92.22.63.23.32.53.04.03.93.03.04.44.52.93.03.63.83.02.93.63.83.33.54.74.63.74.35.85.24.04.25.35.04.04.14.65.34.34.55.96.36.2

us-gaap:AccountsReceivableNetCurrent dei:LegalEntity

cms:ConsumersEnergyCompany


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value7188018286206537858276116538948556866908588856126487558006165857137586276558888636697391013902669719901844659659737860683706915963
Percentage of AccountsReceivableNetCurrent96.495.595.995.788.688.893.395.387.289.788.796.697.585.685.897.097.397.497.497.297.097.797.998.097.997.898.098.098.098.298.798.798.898.698.798.898.498.399.099.098.298.498.2
Percentage of Assets2.42.72.82.12.32.93.12.32.63.63.52.93.03.83.82.83.03.53.73.02.93.63.73.23.44.64.53.64.25.75.23.94.15.24.94.04.04.65.24.34.45.86.2
Percentage of Assets cms:ConsumersEnergyCompany2.83.23.32.52.63.23.52.72.94.13.93.23.24.14.23.03.23.84.03.23.13.94.13.53.75.04.84.04.56.25.64.24.45.55.24.24.24.85.54.54.76.16.5

us-gaap:AccountsReceivableNetCurrent us-gaap:ConsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary


Accounts
Period End2021-06-302021-03-312020-12-312020-09-30
Value7.09.05.01.0
Percentage of AccountsReceivableNetCurrent0.91.10.60.2
Percentage of Assets0.00.00.00.0
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary1.01.30.70.1

Other Assets Current

us-gaap:OtherAssetsCurrent

us-gaap:OtherAssetsCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1391451121481621018686839710110393101831181171208194102917787898472791081198668795653627050504937393731
Percentage of OtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.50.50.40.50.60.40.30.30.30.40.40.40.40.40.40.50.50.60.40.50.50.50.40.40.50.40.40.40.60.70.50.40.50.30.30.40.40.30.30.30.20.20.20.2

us-gaap:OtherAssetsCurrent dei:LegalEntity

cms:ConsumersEnergyCompany


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value12511968126143857374718683908289711101101147085978466798378637310111177607250455663424343303027
Percentage of OtherAssetsCurrent89.982.160.785.188.384.284.986.085.588.782.287.488.288.185.593.294.095.086.490.495.192.385.790.893.392.987.592.493.593.389.588.291.189.384.990.390.084.086.087.881.176.973.0
Percentage of Assets0.40.40.20.40.50.30.30.30.30.30.30.40.40.40.30.50.50.50.30.40.50.40.30.40.40.40.30.40.60.60.40.40.40.30.30.30.40.30.30.30.20.20.2
Percentage of Assets cms:ConsumersEnergyCompany0.50.50.30.50.60.40.30.30.30.40.40.40.40.40.30.50.50.60.40.40.50.50.40.40.50.40.40.40.60.70.50.40.40.30.30.40.40.30.30.30.20.20.2

Construction In Progress Gross

us-gaap:ConstructionInProgressGross

us-gaap:ConstructionInProgressGross


Construction
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value83292810851439122210328961143973822763948787708765881802798761698612145115091310119111411106121113391206114994311081135108011341011899783672644627570506
Percentage of ConstructionInProgressGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.83.13.74.94.33.83.34.43.83.33.14.03.43.13.34.03.73.73.53.33.07.27.46.76.25.95.86.67.66.76.65.66.46.66.36.86.25.64.84.24.04.03.73.3

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value83268178795378457697756373607264713072367037690968086682651064036311620660565953592258785747569756335545541553215242516850875355527852005121504749735008490148694802473146464540
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets27.827.526.826.826.927.627.427.928.229.228.728.929.229.228.228.928.928.728.028.628.929.328.329.329.328.928.228.929.628.829.231.530.330.129.930.430.531.029.830.530.130.229.829.8

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment us-gaap:PropertyPlantAndEquipmentByType

cms:NonUtilityPlantAssets


Accumulated
Period End2020-12-312019-12-31
Value11291
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment1.41.2
Percentage of Assets0.40.3
Percentage of Assets cms:NonUtilityPlantAssets0.00.0

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment us-gaap:PublicUtility

cms:UtilityPlantAssets


Accumulated
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value78417269695664395993567453455021506048444592
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment98.698.898.898.999.098.798.798.798.898.898.8
Percentage of Assets26.427.128.427.927.727.927.928.829.529.429.4
Percentage of Assets cms:UtilityPlantAssets0.00.00.00.00.00.00.00.00.00.00.0

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value21533212072103920630194361914418926185241810618315181261779017237169041676116444161191585715715154431518714907147051416013775135261341212246
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets71.971.370.970.568.069.770.571.271.673.973.974.473.973.972.774.373.773.372.774.174.274.472.372.871.670.569.970.3

us-gaap:PropertyPlantAndEquipmentNet us-gaap:ConsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary


Property
Period End2021-06-302021-03-312020-12-312020-09-30
Value680686692696
Percentage of PropertyPlantAndEquipmentNet3.23.23.33.4
Percentage of Assets2.32.32.32.4
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary97.197.498.297.8

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value3447495154
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0
Percentage of Assets0.10.20.20.20.2

us-gaap:OperatingLeaseRightOfUseAsset dei:LegalEntity

cms:ConsumersEnergyCompany


Operating
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value2840414446
Percentage of OperatingLeaseRightOfUseAsset82.485.183.786.385.2
Percentage of Assets0.10.10.20.20.2
Percentage of Assets cms:ConsumersEnergyCompany0.10.20.20.20.2

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

us-gaap:OtherAssetsNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value819873869688707723739492519538478629779789799269294321353258285315384288319354352335362392409233259283293217240268276203234252245226
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.72.92.92.32.52.62.81.92.12.21.92.63.33.53.51.21.31.51.61.21.41.61.91.51.71.81.81.82.02.22.31.41.51.61.71.31.51.71.71.31.51.61.61.5

us-gaap:OtherAssetsNoncurrent dei:LegalEntity

cms:ConsumersEnergyCompany


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value740750753575599619637407434458410545660674687160189218250151179209262165194230236208233263283149172198209134157179196123150174176
Percentage of OtherAssetsNoncurrent90.485.986.783.684.785.686.282.783.685.185.886.684.785.486.059.564.367.970.858.562.866.368.257.360.865.067.062.164.467.169.263.966.470.071.361.865.466.871.060.664.169.071.8
Percentage of Assets2.52.52.52.02.12.32.41.61.71.81.72.32.82.93.00.70.91.01.20.70.91.01.30.81.01.21.21.11.31.51.60.91.01.11.20.81.01.11.20.80.91.11.1
Percentage of Assets cms:ConsumersEnergyCompany2.93.03.02.32.42.62.71.81.92.11.92.53.13.23.30.80.91.11.30.81.01.11.40.91.11.31.31.21.41.61.70.91.01.21.30.81.01.21.30.81.01.21.2

us-gaap:OtherAssetsNoncurrent us-gaap:ConsolidatedEntities

srt:ParentCompany


Other
Period End2020-12-312019-12-312018-12-312017-12-31
Value5.01610.02.0
Percentage of OtherAssetsNoncurrent0.62.22.10.3
Percentage of Assets0.00.10.00.0
Percentage of Assets srt:ParentCompany0.10.20.10.0

Accounts Payable Current

us-gaap:AccountsPayableCurrent

us-gaap:AccountsPayableCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value659538671662629490622598627544723680623534725624599479598539559534633586558512678604587632585519512426512491527409575484444413492509
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.21.82.32.32.21.82.32.32.52.22.92.82.72.33.12.82.72.22.82.62.72.73.13.02.92.73.53.33.33.53.43.12.92.53.03.03.22.53.53.02.82.63.23.3

us-gaap:AccountsPayableCurrent dei:LegalEntity

cms:ConsumersEnergyCompany


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value630501636626595458593569595515685636594514701601580465580521545521613571540496662591573611571508502414501480512396561473429403471
Percentage of AccountsPayableCurrent95.693.194.894.694.693.595.395.294.994.794.793.595.396.396.796.396.897.197.096.797.597.696.897.496.896.997.697.897.696.797.697.998.097.297.997.897.296.897.697.796.697.695.7
Percentage of Assets2.11.72.12.12.11.72.22.22.42.12.82.72.52.23.02.72.72.22.72.52.72.63.02.92.82.63.53.23.23.43.33.02.92.42.92.93.12.53.43.02.72.63.0
Percentage of Assets cms:ConsumersEnergyCompany2.52.02.52.52.41.92.52.52.72.33.13.02.82.53.32.92.92.32.92.72.92.83.33.23.02.83.73.53.53.73.53.23.12.53.13.03.32.63.63.12.82.73.2

us-gaap:AccountsPayableCurrent us-gaap:ConsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary


Accounts
Period End2021-06-302021-03-312020-12-312020-09-30
Value10.06.03.07.0
Percentage of AccountsPayableCurrent1.51.10.41.1
Percentage of Assets0.00.00.00.0
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary1.40.90.41.0

Debt Current

us-gaap:DebtCurrent us-gaap:ConsolidatedEntities

us-gaap:DebtCurrent

srt:ParentCompany


Debt
Period End2020-12-312019-12-312018-12-312017-12-31
Value2000.0180225
Percentage of DebtCurrent100.00.0100.0100.0
Percentage of Assets0.70.00.71.0
Percentage of Assets srt:ParentCompany2.00.02.32.9

Liabilities Current

us-gaap:LiabilitiesCurrent

us-gaap:LiabilitiesCurrent


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value31142885307429923123294027042165238621062624344225352482278422612115192626552069209120472302178816401599201416481563180119451464180216451797148518071819233822142241229020211954
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.49.710.410.210.910.710.18.39.48.510.714.410.910.912.110.29.78.912.39.910.210.211.39.28.58.310.59.08.810.011.28.610.39.510.58.911.111.314.213.914.114.612.912.8

us-gaap:LiabilitiesCurrent dei:LegalEntity

cms:ConsumersEnergyCompany


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value1822170921391626182016711712115612571298161823071635205621361679158314002094130315711511173113151146108013861161128813431480111711881286141011301274109016421383136312871161
Percentage of LiabilitiesCurrent58.559.269.654.358.356.863.353.452.761.661.767.064.582.876.774.374.872.778.963.075.173.875.273.569.967.568.870.482.474.676.176.365.978.278.576.170.559.970.262.560.856.257.4
Percentage of Assets6.15.77.25.66.46.16.44.45.05.26.69.67.09.09.37.67.26.59.76.37.77.58.56.86.05.67.26.37.37.58.56.66.87.48.26.87.86.710.08.78.58.27.4
Percentage of Assets cms:ConsumersEnergyCompany7.16.88.46.57.36.97.25.05.65.97.310.77.79.810.18.27.87.110.56.98.48.29.37.36.46.07.86.97.98.29.16.97.27.98.77.28.27.110.59.29.08.67.8

us-gaap:LiabilitiesCurrent us-gaap:ConsolidatedEntities

srt:ParentCompany


Liabilities
Period End2020-12-312019-12-312018-12-312017-12-31
Value311200332351
Percentage of LiabilitiesCurrent10.17.412.712.6
Percentage of Assets1.00.71.41.5
Percentage of Assets srt:ParentCompany3.12.34.24.6

Long Term Debt Current

us-gaap:LongTermDebtCurrent

us-gaap:LongTermDebtCurrent


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value572150014861800170017001111110011008219741900120013001081959819790864984897929684720498521519669418645541511737711519488631814103311161099726
Percentage of LongTermDebtCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.95.05.06.15.96.24.14.24.33.34.07.95.15.74.74.33.73.74.04.74.44.63.43.72.62.72.73.62.43.63.13.04.24.13.02.93.95.06.37.06.94.6

us-gaap:LongTermDebtCurrent dei:LegalEntity

cms:ConsumersEnergyCompany


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value3643643645375375022021022626268763766933434433733053752754484481982611001131246045444342422414140403933933833837
Percentage of LongTermDebtCurrent63.624.324.529.831.629.518.29.32.43.22.746.131.353.331.746.245.538.643.427.949.948.228.936.220.121.723.99.010.86.87.98.25.733.97.98.26.34.832.830.330.85.1
Percentage of Assets1.21.21.21.81.91.80.80.40.10.10.13.71.63.01.52.01.71.41.71.32.22.21.01.30.50.60.60.30.30.20.20.20.21.40.20.20.20.22.12.12.10.2
Percentage of Assets cms:ConsumersEnergyCompany1.41.41.42.22.12.10.90.40.10.10.14.11.83.31.62.21.81.51.91.42.42.41.11.50.60.60.70.40.30.30.30.30.31.50.30.30.30.32.22.22.20.2

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OperatingLeaseLiabilityCurrent


Operating
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value9000000.09000000.09000000.010000000.010000000.0
Percentage of OperatingLeaseLiabilityCurrent100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.0

us-gaap:OperatingLeaseLiabilityCurrent dei:LegalEntity

cms:ConsumersEnergyCompany


Operating
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value7000000.08000000.08000000.08000000.08000000.0
Percentage of OperatingLeaseLiabilityCurrent77.888.988.980.080.0
Percentage of Assets0.00.00.00.00.0
Percentage of Assets cms:ConsumersEnergyCompany0.00.00.00.00.0

Other Liabilities Current

us-gaap:OtherLiabilitiesCurrent

us-gaap:OtherLiabilitiesCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value174155156193181162186170182148147134117134195130145135199159127118142130123117163124129131146136139134152137136139159131122109144123
Percentage of OtherLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.60.50.50.70.60.60.70.70.70.60.60.60.50.60.80.60.70.60.90.80.60.60.70.70.60.60.80.70.70.70.80.80.80.80.90.80.80.91.00.80.80.70.90.8

us-gaap:OtherLiabilitiesCurrent dei:LegalEntity

cms:ConsumersEnergyCompany


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value12210610412411710511812714211512096841031599310899164127938710910093901359997101112991009710910510810311994857695
Percentage of OtherLiabilitiesCurrent70.168.466.764.264.664.863.474.778.077.781.671.671.876.981.571.574.573.382.479.973.273.776.876.975.676.982.879.875.277.176.772.871.972.471.776.679.474.174.871.869.769.766.0
Percentage of Assets0.40.40.40.40.40.40.40.50.60.50.50.40.40.50.70.40.50.50.80.60.50.40.50.50.50.50.70.50.50.60.60.60.60.60.60.60.70.60.70.60.50.50.6
Percentage of Assets cms:ConsumersEnergyCompany0.50.40.40.50.50.40.50.60.60.50.50.40.40.50.80.50.50.50.80.70.50.50.60.60.50.50.80.60.60.60.70.60.60.60.70.70.70.70.80.60.60.50.6

us-gaap:OtherLiabilitiesCurrent us-gaap:ConsolidatedEntities

srt:ParentCompany


Other
Period End2020-12-312019-12-312018-12-312017-12-31
Value9.0387.05.0
Percentage of OtherLiabilitiesCurrent5.820.44.82.6
Percentage of Assets0.00.10.00.0
Percentage of Assets srt:ParentCompany0.10.40.10.1

us-gaap:OtherLiabilitiesCurrent us-gaap:RestructuringCostAndReserve, us-gaap:RestructuringPlan

cms:RetentionBenefits, cms:D.E.KarnGeneratingComplex


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value5.04.03.07.05.04.02.0
Percentage of OtherLiabilitiesCurrent2.92.61.93.62.82.51.1
Percentage of Assets0.00.00.00.00.00.00.0
Percentage of Assets cms:RetentionBenefits cms:D.E.KarnGeneratingComplex0.00.00.00.00.00.00.0

Taxes Payable Current

us-gaap:TaxesPayableCurrent

us-gaap:TaxesPayableCurrent


Taxes
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value357360457128326330437125295295398107267265360902562603489325225434990235239316892252252978820621127983199206282103239239302283
Percentage of TaxesPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.21.21.50.41.11.21.60.51.21.21.60.41.11.21.60.41.21.21.60.41.21.31.70.51.21.21.60.51.31.31.70.51.21.21.60.51.21.31.70.61.51.51.91.9

us-gaap:TaxesPayableCurrent dei:LegalEntity

cms:ConsumersEnergyCompany


Taxes
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value36936445813434136348115829836943614827948454211125729135411426526235278166140149159283343353201316329376198271250287102163182199
Percentage of TaxesPayableCurrent103.4101.1100.2104.7104.6110.0110.1126.4101.0125.1109.5138.3104.5182.6150.6123.3100.4111.9101.7122.6105.2103.1100.986.770.658.647.2178.7125.8152.4118.9228.4153.4155.9134.8238.6136.2121.4101.899.068.276.265.9
Percentage of Assets1.21.21.50.51.21.31.80.61.21.51.80.61.22.12.40.51.21.31.60.51.31.31.70.40.90.70.80.91.61.92.01.21.81.92.21.21.71.51.70.61.01.21.3
Percentage of Assets cms:ConsumersEnergyCompany1.41.41.80.51.41.52.00.71.31.72.00.71.32.32.60.51.31.51.80.61.41.41.90.40.90.80.80.91.72.12.21.21.92.02.31.31.71.61.80.71.11.21.3

Liabilities Noncurrent

us-gaap:LiabilitiesNoncurrent

us-gaap:LiabilitiesNoncurrent


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
Value2047320536205152039020207192851907818850180181779217113156851606815753157881528715266152901467714477141791384414063137251374313760134641302612474124681198012089122671227412096118831133111248110421065710702104211075810364
Percentage of LiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets68.469.169.269.670.770.371.172.571.271.869.865.668.968.968.569.169.870.767.969.569.369.169.170.671.471.770.270.970.469.668.871.270.471.170.671.569.569.667.166.867.166.668.967.9

us-gaap:LiabilitiesNoncurrent dei:LegalEntity

cms:ConsumersEnergyCompany


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value1488114805147041464714735144321425014046135121343013487122621276012180124751216912160121781191311716112151119511381111401125511258111841050798499874984210140104301018310283100719696967496269264938593169498
Percentage of LiabilitiesNoncurrent72.772.171.771.872.974.874.774.575.075.578.878.279.477.379.079.679.779.681.280.979.180.980.981.281.981.883.180.779.079.282.283.985.083.085.084.885.686.087.286.987.789.488.3
Percentage of Assets49.749.849.650.051.652.653.154.053.454.255.051.354.753.354.155.055.656.355.156.254.855.956.057.358.558.658.357.255.655.156.559.759.859.060.060.659.559.958.558.158.959.660.8
Percentage of Assets cms:ConsumersEnergyCompany57.958.657.959.058.859.660.161.260.360.961.257.160.058.159.159.760.261.459.761.760.060.861.062.063.063.162.762.160.160.560.863.063.662.663.263.762.363.461.561.562.162.364.0

us-gaap:LiabilitiesNoncurrent us-gaap:ConsolidatedEntities

srt:ParentCompany


Liabilities
Period End2020-12-312019-12-312018-12-312017-12-31
Value4076348428922853
Percentage of LiabilitiesNoncurrent19.918.316.918.1
Percentage of Assets13.713.011.812.4
Percentage of Assets srt:ParentCompany41.240.036.237.3

Long Term Debt

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

us-gaap:LongTermDebt

cms:ConsumersEnergyCompany, cms:PalisadesPowerPurchaseAgreement, cms:FinancingObligation


Long
Period End2020-12-31
Value16
Percentage of LongTermDebt100.0
Percentage of Assets0.1
Percentage of Assets cms:ConsumersEnergyCompany cms:PalisadesPowerPurchaseAgreement cms:FinancingObligation0.0

Long Term Debt Noncurrent

us-gaap:LongTermDebtNoncurrent

us-gaap:LongTermDebtNoncurrent


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1172813561136341327513414125451195112040112361110510615886992728996912390249091912986408722848681708441790380408143801680427535753671017089669567416710671162216193604060376184592664485895
Percentage of LongTermDebtNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets39.245.646.045.346.945.744.546.344.444.843.337.139.839.339.640.841.642.240.041.841.540.841.540.641.842.441.843.842.542.040.841.738.439.039.240.438.238.336.737.838.837.941.338.6

us-gaap:LongTermDebtNoncurrent dei:LegalEntity

cms:ConsumersEnergyCompany


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value7730774377427458786776167048708765466565677952395738521155615275533954195253536549224934520649695141515451545230455545674579459142764086429743083967397739873997416941794488
Percentage of LongTermDebtNoncurrent65.957.156.856.258.660.759.058.958.359.163.959.161.957.961.058.558.759.460.861.558.060.461.762.963.963.364.365.060.560.664.564.863.960.664.064.263.864.266.066.267.470.569.6
Percentage of Assets25.826.126.125.527.527.726.327.225.926.527.621.924.622.824.123.824.425.124.325.724.124.625.625.526.726.826.928.525.725.526.327.024.523.725.125.924.324.624.225.026.126.728.7
Percentage of Assets cms:ConsumersEnergyCompany30.130.630.530.031.431.529.730.929.229.830.824.427.024.926.425.926.427.326.328.326.326.827.927.628.828.928.930.927.828.028.328.526.125.126.427.325.526.025.526.527.627.930.2

us-gaap:LongTermDebtNoncurrent dei:LegalEntity, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

cms:ConsumersEnergyCompany, cms:PalisadesPowerPurchaseAgreement, cms:FinancingObligation


Long
Period End2020-12-312019-12-31
Value3.016
Percentage of LongTermDebtNoncurrent0.00.1
Percentage of Assets0.00.1
Percentage of Assets cms:ConsumersEnergyCompany cms:PalisadesPowerPurchaseAgreement cms:FinancingObligation0.00.0

us-gaap:LongTermDebtNoncurrent us-gaap:ConsolidatedEntities

srt:ParentCompany


Long
Period End2020-12-312019-12-312018-12-312017-12-31
Value3926333427502830
Percentage of LongTermDebtNoncurrent28.827.925.931.0
Percentage of Assets13.212.411.212.3
Percentage of Assets srt:ParentCompany39.738.334.537.0

Deferred Income Tax Liabilities Net

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredIncomeTaxLiabilitiesNet


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value19661926186318211763172216551588154815441487138213441269
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.66.56.36.26.26.36.26.16.16.26.15.85.85.5

us-gaap:DeferredIncomeTaxLiabilitiesNet dei:LegalEntity

cms:ConsumersEnergyCompany


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value22132159209420421958192318641858185118401809171116891640
Percentage of DeferredIncomeTaxLiabilitiesNet112.6112.1112.4112.1111.1111.7112.6117.0119.6119.2121.7123.8125.7129.2
Percentage of Assets7.47.37.17.06.97.06.97.17.37.47.47.27.27.1
Percentage of Assets cms:ConsumersEnergyCompany8.68.58.28.27.87.97.98.18.38.38.28.07.97.8

Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent


Pension
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value149151152382140141674447443440436797787778766760770781789560570581591847846844872242241240239740139313981451129112891288128911391136113511351460
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.50.50.51.30.50.52.51.71.81.81.83.33.43.43.33.43.53.63.62.72.82.92.94.44.44.44.51.31.41.31.44.48.08.18.57.87.98.07.87.17.17.37.39.6

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent dei:LegalEntity

cms:ConsumersEnergyCompany


Pension
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value11011111233910210362240440039639274173172171170371272373050051051952977076876679318318218017970213291334138512291227122512251081107810761076
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent73.873.573.788.772.973.092.390.490.390.089.993.092.992.792.892.592.592.692.589.389.589.389.590.990.890.890.975.675.575.074.994.995.495.495.595.295.295.195.094.994.994.894.8
Percentage of Assets0.40.40.41.20.40.42.31.61.61.61.63.13.13.23.13.23.33.33.42.42.52.62.64.04.04.04.11.01.01.01.04.17.67.78.17.47.57.67.46.86.86.96.9
Percentage of Assets cms:ConsumersEnergyCompany0.40.40.41.40.40.42.61.81.81.81.83.43.43.43.43.43.53.63.72.62.72.82.84.34.34.34.41.11.11.11.14.48.18.28.57.87.98.07.87.27.17.27.3

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

cms:ConsumersEnergyCompany, us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit


Pension
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value11010294105104
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent72.415.121.613.713.2
Percentage of Assets0.40.40.40.50.5
Percentage of Assets cms:ConsumersEnergyCompany us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit0.00.00.00.00.0

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap:ConsolidatedEntities

srt:ParentCompany


Pension
Period End2020-12-312019-12-312018-12-312017-12-31
Value21211721
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent13.83.13.92.7
Percentage of Assets0.10.10.10.1
Percentage of Assets srt:ParentCompany0.20.20.20.3

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap:RetirementPlanType

us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit


Pension
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value150140130145143
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent98.720.829.818.918.1
Percentage of Assets0.50.50.50.60.7
Percentage of Assets us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefit0.00.00.00.00.0

Minority Interest

us-gaap:MinorityInterest

us-gaap:MinorityInterest


Minority
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value56957558157837373737373737373737373737373737373737373737373737373737374444444444444444444497
Percentage of MinorityInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.91.92.02.00.10.10.10.10.10.10.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.30.30.30.30.30.30.30.30.30.30.6

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value382397398429413395383373364345294295305307307308289295290283301314313299304304299307303307306316316311311323336328336265278288267310
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.31.31.31.51.41.41.41.41.41.41.21.21.31.31.31.41.31.41.31.41.51.61.51.51.61.61.61.71.71.71.81.91.81.81.81.92.12.02.01.71.71.81.72.0

us-gaap:OtherLiabilitiesNoncurrent dei:LegalEntity

cms:ConsumersEnergyCompany


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value320314311349334311304298291274230233243244241241219223218212231243236239243241237243251253252260259253252252262254256178186187176
Percentage of OtherLiabilitiesNoncurrent83.879.178.181.480.978.779.479.979.979.478.279.079.779.578.578.275.875.675.274.976.777.475.479.979.979.379.379.282.882.482.482.382.081.481.078.078.077.476.267.266.964.965.9
Percentage of Assets1.11.11.01.21.21.11.11.11.21.10.91.01.01.11.01.11.01.01.01.01.11.21.21.21.31.31.21.31.41.41.41.51.51.51.51.51.61.61.61.11.21.21.1
Percentage of Assets cms:ConsumersEnergyCompany1.21.21.21.41.31.31.31.31.31.21.01.11.11.21.11.21.11.11.11.11.21.31.31.31.41.31.31.41.51.61.61.61.61.61.51.61.71.71.61.21.21.31.2

us-gaap:OtherLiabilitiesNoncurrent us-gaap:ConsolidatedEntities

srt:ParentCompany


Other
Period End2020-12-312019-12-312018-12-312017-12-31
Value13179.02.0
Percentage of OtherLiabilitiesNoncurrent3.34.43.10.7
Percentage of Assets0.00.10.00.0
Percentage of Assets srt:ParentCompany0.10.20.10.0

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent


Operating
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value2537394144
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.20.2

us-gaap:OperatingLeaseLiabilityNoncurrent dei:LegalEntity

cms:ConsumersEnergyCompany


Operating
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value2132333537
Percentage of OperatingLeaseLiabilityNoncurrent84.086.584.685.484.1
Percentage of Assets0.10.10.10.10.1
Percentage of Assets cms:ConsumersEnergyCompany0.10.10.10.20.2

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value4.011111111
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo dei:LegalEntity

cms:ConsumersEnergyCompany


Lessee
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value4.09.09.09.010.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.081.881.881.890.9
Percentage of Assets0.00.00.00.00.0
Percentage of Assets cms:ConsumersEnergyCompany0.00.00.00.00.0

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value2.05.0111111
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree dei:LegalEntity

cms:ConsumersEnergyCompany


Lessee
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value2.04.09.09.09.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.080.081.881.881.8
Percentage of Assets0.00.00.00.00.0
Percentage of Assets cms:ConsumersEnergyCompany0.00.00.00.00.0

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour


Lessee
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value1000000.03000000.05000000.05000000.05000000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour dei:LegalEntity

cms:ConsumersEnergyCompany


Lessee
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value1000000.03000000.04000000.04000000.04000000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0100.080.080.080.0
Percentage of Assets0.00.00.00.00.0
Percentage of Assets cms:ConsumersEnergyCompany0.00.00.00.00.0

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value1000000.02000000.03000000.03000000.03000000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive dei:LegalEntity

cms:ConsumersEnergyCompany


Lessee
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value1000000.02000000.03000000.03000000.02000000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0100.0100.0100.066.7
Percentage of Assets0.00.00.00.00.0
Percentage of Assets cms:ConsumersEnergyCompany0.00.00.00.00.0

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive


Lessee
Period End2020-12-312019-12-31
Value3435
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0100.0
Percentage of Assets0.10.1

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive dei:LegalEntity

cms:ConsumersEnergyCompany


Lessee
Period End2020-12-312019-12-31
Value2729
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive79.482.9
Percentage of Assets0.10.1
Percentage of Assets cms:ConsumersEnergyCompany0.10.1

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value3446485154
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0
Percentage of Assets0.10.20.20.20.2

us-gaap:OperatingLeaseLiability dei:LegalEntity

cms:ConsumersEnergyCompany


Operating
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value2840414345
Percentage of OperatingLeaseLiability82.487.085.484.383.3
Percentage of Assets0.10.10.20.20.2
Percentage of Assets cms:ConsumersEnergyCompany0.10.20.20.20.2

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value5267697275
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0100.0100.0100.0100.0
Percentage of Assets0.20.20.30.30.3

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue dei:LegalEntity

cms:ConsumersEnergyCompany


Lessee
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value4356586062
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue82.783.684.183.382.7
Percentage of Assets0.10.20.20.20.3
Percentage of Assets cms:ConsumersEnergyCompany0.20.20.30.30.3

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value1821212121
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.1

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount dei:LegalEntity

cms:ConsumersEnergyCompany


Lessee
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value1516171717
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount83.376.281.081.081.0
Percentage of Assets0.10.10.10.10.1
Percentage of Assets cms:ConsumersEnergyCompany0.10.10.10.10.1

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value57975727549653205214518550184957485148584755474946724596444145354449437042534259415641093938390238183802367036703645361834543396332333063194319631113049302830432958288727932602
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets19.419.318.518.218.218.918.719.119.219.619.419.920.020.119.320.520.320.219.720.420.320.519.420.119.819.819.120.020.620.219.820.019.119.118.619.219.118.918.419.118.618.517.917.1

us-gaap:StockholdersEquity dei:LegalEntity

cms:ConsumersEnergyCompany


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value8940872985198526846880667700769976107287688368866851667664516495642562095902592458795679550954855429547952405214521350584820480047544759453845594540445943504367430943104136
Percentage of StockholdersEquity154.2152.4155.0160.3162.4155.6153.4155.3156.9150.0144.8145.0146.6145.3145.3143.2144.4142.1138.8139.1141.5138.2139.9140.6142.2144.1142.8142.1143.0139.8139.5141.3143.1144.0142.1142.6145.9146.2143.7143.5145.7149.3148.1
Percentage of Assets29.829.428.729.129.629.428.729.630.129.428.128.829.429.228.029.429.428.727.328.428.728.327.128.228.228.527.328.429.428.227.728.327.327.626.527.527.927.626.427.427.027.626.5
Percentage of Assets cms:ConsumersEnergyCompany34.834.533.534.333.833.332.533.633.933.031.332.032.231.930.631.931.831.329.631.231.430.829.530.530.430.729.430.831.831.029.829.829.029.227.928.829.229.227.829.028.528.827.9

us-gaap:StockholdersEquity us-gaap:ConsolidatedEntities

srt:ParentCompany


Stockholders
Period End2020-12-312019-12-31
Value54965018
Percentage of StockholdersEquity100.0100.0
Percentage of Assets18.518.7
Percentage of Assets srt:ParentCompany55.657.7

Stockholders Equity Including Portion Attributable To Noncontrolling Interest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value636663026077589852515222505549944888489547924786470946334478457244864407429042964193414639753939385538393707370736823655349134333360335032383240315530933072308730022931283728662993294129382815
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets21.321.220.520.118.419.018.819.219.319.719.520.020.220.319.420.720.520.419.820.620.520.719.520.220.020.019.320.220.820.420.020.219.319.418.919.519.419.118.719.318.818.718.20.00.00.019.30.0

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest dei:LegalEntity

cms:ConsumersEnergyCompany


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value897787668556856385058103773777367647732469206923688867136488653264626246593959615916571655465522546655165277525152505095485748374791480345824603458445034394441143534354418042064132405038583749
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest141.0139.1140.8145.2162.0155.2153.1154.9156.4149.6144.4144.7146.3144.9144.9142.9144.0141.7138.4138.8141.1137.9139.5140.2141.8143.7142.4141.7142.6139.4139.1140.9142.6143.4141.5142.1145.3145.6143.0142.9145.0148.5147.3146.8138.1137.7131.3133.2
Percentage of Assets30.029.528.829.229.829.528.829.730.229.528.229.029.529.428.129.529.628.927.528.628.928.527.328.428.428.727.528.629.628.427.928.527.527.826.727.728.127.926.727.627.327.826.80.00.00.025.30.0
Percentage of Assets cms:ConsumersEnergyCompany35.034.733.734.533.933.532.633.734.133.231.432.232.432.030.832.132.031.529.831.431.631.029.730.730.630.929.631.032.031.230.030.129.229.528.229.129.529.528.129.328.829.128.20.00.00.026.40.0

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

cms:ConsumersEnergyCompany, us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value-35.0-36.0-36.0-27.0-28.0-28.0-28.0-20.0-20.0-21.0-21.0-27.0-28.0-28.0-24.0-20.0-20.0-21.0-21.0-19.0-19.0-19.0-19.0-23.0-24.0-25.0-26.0-15.0-16.0-17.0-17.0-23.0-23.0-24.0-25.0-17.0-18.0-18.0-19.0-15.0-15.0-15.0-16.0-11.0-11.0-11.0-11.0-7.0
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-0.5-0.6-0.6-0.5-0.5-0.5-0.6-0.4-0.4-0.4-0.4-0.6-0.6-0.6-0.5-0.4-0.4-0.5-0.5-0.4-0.5-0.5-0.5-0.6-0.6-0.7-0.7-0.4-0.4-0.5-0.5-0.7-0.7-0.7-0.8-0.5-0.6-0.6-0.6-0.5-0.5-0.5-0.6-0.4-0.4-0.4-0.4-0.2
Percentage of Assets-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.10.00.00.0-0.10.0
Percentage of Assets cms:ConsumersEnergyCompany us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cms:ConsumersEnergyCompany, us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-312013-09-302013-06-302013-03-312012-12-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value-35.0-36.0-36.0-27.0-28.0-28.0-28.0-20.0-20.0-21.0-21.0-27.0-29.0-29.0-12.0-8.0-8.0-9.0-3.0-3.0-1.0-3.0-6.0-11.0-12.0-11.0-7.02.02.0-2.0-9.0-9.0-6.0-8.0-1.0-4.0-2.00.00.00.00.06.00.01.02.0-1.0
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-0.5-0.6-0.6-0.5-0.5-0.5-0.6-0.4-0.4-0.4-0.4-0.6-0.6-0.6-0.3-0.2-0.2-0.2-0.1-0.1-0.0-0.1-0.2-0.3-0.3-0.3-0.20.10.1-0.1-0.3-0.3-0.2-0.2-0.0-0.1-0.10.00.00.00.00.20.00.00.1-0.0
Percentage of Assets-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.1-0.1-0.1-0.00.00.0-0.0-0.1-0.1-0.0-0.0-0.0-0.0-0.00.00.00.00.00.00.00.00.00.0
Percentage of Assets cms:ConsumersEnergyCompany us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cms:ConsumersEnergyCompany, us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value629961746024602460245724537453745374504946994699469945494449444944494249399939993999387437243724372437243574357435723407325732573257325731073107310731072957295729572957283228322832278225822482
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest98.998.099.1102.1114.7109.6106.3107.6109.9103.198.198.299.898.299.497.399.296.493.293.195.493.493.794.596.697.096.496.497.093.293.394.996.997.296.095.998.5100.596.395.898.5100.999.898.894.694.687.988.2
Percentage of Assets21.020.820.320.621.120.920.020.721.220.419.219.720.219.919.320.120.319.718.519.219.519.318.319.119.419.418.619.420.219.018.719.218.718.918.118.719.119.218.018.518.518.918.10.00.00.016.90.0
Percentage of Assets cms:ConsumersEnergyCompany us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cms:ConsumersEnergyCompany, us-gaap:PreferredStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value373737373737373737373737373737373737373737373737373737373737373737444444444444444444444444444444
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.60.60.60.60.70.70.70.70.80.80.80.80.80.80.80.80.80.80.90.90.90.90.90.91.01.01.01.01.01.01.11.11.11.31.41.41.41.41.41.41.51.51.61.51.51.51.51.6
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.30.30.30.30.30.30.30.30.30.30.00.00.00.30.0
Percentage of Assets cms:ConsumersEnergyCompany us-gaap:PreferredStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cms:ConsumersEnergyCompany, us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value183517501690168816311529151315041415141813641373134013151173121311431128106510871040967950931876925832797798810724711665667598611593515554569511512463483415382389383
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest28.827.827.828.631.129.329.930.128.929.028.528.728.528.426.226.525.525.624.825.324.823.323.923.622.724.122.421.521.722.220.720.719.819.918.518.918.816.718.018.417.017.516.316.913.913.013.213.6
Percentage of Assets6.15.95.75.85.75.65.65.85.65.75.65.75.75.85.15.55.25.24.95.25.14.84.74.84.64.84.34.34.54.54.24.23.83.93.53.73.63.23.43.63.23.33.00.00.00.02.50.0
Percentage of Assets cms:ConsumersEnergyCompany us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value-77.0-79.0-80.0-71.0-68.0-68.0-69.0-62.0-62.0-63.0-63.0-59.0-60.0-60.0-50.0-49.0-49.0-50.0-50.0-42.0-43.0-43.0-43.0-45.0-46.0-47.0-48.0-20.0-20.0-21.0-21.0-38.0-54.0-55.0-56.0-45.0-46.0-47.0-48.0-38.0-38.0-39.0-39.0-30.0-30.0-31.0-32.0-27.0-15.0
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-1.2-1.3-1.3-1.2-1.3-1.3-1.4-1.2-1.3-1.3-1.3-1.2-1.3-1.3-1.1-1.1-1.1-1.1-1.2-1.0-1.0-1.0-1.1-1.1-1.2-1.2-1.3-0.5-0.5-0.6-0.6-1.1-1.6-1.6-1.7-1.4-1.5-1.5-1.6-1.2-1.3-1.3-1.4-1.0-1.0-1.1-1.1-1.00.0
Percentage of Assets-0.3-0.3-0.3-0.2-0.2-0.2-0.3-0.2-0.2-0.3-0.3-0.2-0.3-0.3-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.3-0.1-0.1-0.1-0.1-0.2-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.2-0.2-0.2-0.20.00.00.0-0.20.00.0
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value-5.0-5.0-6.0-8.0-8.0-8.0-4.0-5.0-5.0-3.0-2.0
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-0.1-0.1-0.1-0.1-0.2-0.2-0.1-0.1-0.1-0.1-0.0
Percentage of Assets-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0
Percentage of Assets us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value-82.0-84.0-86.0-79.0-76.0-76.0-73.0-67.0-67.0-66.0-65.0-59.0-61.0-61.0-50.0-47.0-48.0-49.0-50.0-45.0-47.0-47.0-47.0-49.0-48.0-48.0-49.0-20.0-20.0-21.0-22.0-39.0-56.0-54.0-55.0-43.0-45.0-47.0-49.0-40.0-38.0-40.0-40.0-31.0-31.0-32.0-33.0-28.0-144.0
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-1.3-1.3-1.4-1.3-1.4-1.5-1.4-1.3-1.4-1.3-1.4-1.2-1.3-1.3-1.1-1.0-1.1-1.1-1.2-1.0-1.1-1.1-1.2-1.2-1.2-1.3-1.3-0.5-0.5-0.6-0.6-1.1-1.7-1.6-1.7-1.3-1.4-1.5-1.6-1.3-1.3-1.4-1.4-1.1-1.0-1.1-1.1-1.00.0
Percentage of Assets-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.2-0.3-0.3-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.3-0.2-0.3-0.3-0.1-0.1-0.1-0.1-0.2-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.2-0.3-0.30.00.00.0-0.20.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value5389537153655225521752075113510450975087508850835076503750195013500649274916490849064897483748294812478347744767476147464715470847104703466946624664464146274622462145994588458145694564456045334517
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest84.785.288.388.699.499.7101.1102.2104.3103.9106.2106.2107.8108.7112.1109.6111.6111.8114.6114.2117.0118.1121.7122.6124.8124.6128.8128.6129.3129.8135.1137.1140.2140.4144.2143.9147.8150.0150.6149.7153.9156.9161.7159.8152.7155.2155.2161.00.0
Percentage of Assets18.018.118.117.818.319.019.119.620.220.520.721.321.822.021.822.722.922.822.723.524.024.423.824.825.024.924.925.926.926.527.127.727.027.227.328.128.628.728.129.029.029.429.40.00.00.029.90.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value3.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.02.02.02.02.02.02.02.0
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.00.00.00.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NoncontrollingInterest


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value569575581578373737373737373737373737373737373737373737373737373737373744444444444444444444454544979697
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest8.99.19.69.80.70.70.70.70.80.80.80.80.80.80.80.80.80.80.90.90.90.90.90.91.01.01.01.01.01.01.11.11.11.31.41.41.41.41.41.41.51.51.61.61.51.53.33.40.0
Percentage of Assets1.91.92.02.00.10.10.10.10.10.10.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.30.30.30.30.30.30.30.30.30.30.00.00.00.60.00.0
Percentage of Assets us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value4874372141717051-25.0-83.0-182.0-166.0-271.0-278.0-346.0-383.0-531.0-434.0-512.0-511.0-616.0-607.0-706.0-744.0-855.0-881.0-949.0-936.0-1058.0-1080.0-1099.0-1110.0-1242.0-1276.0-1334.0-1346.0-1423.0-1426.0-1511.0-1548.0-1553.0-1542.0-1628.0-1675.0-1757.0-1731.0-1831.0-1876.0-1927.0-2031.0-2227.0
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest7.76.93.52.91.31.0-0.5-1.7-3.7-3.4-5.7-5.8-7.3-8.3-11.9-9.5-11.4-11.6-14.4-14.1-16.8-17.9-21.5-22.4-24.6-24.4-28.5-29.1-29.8-30.4-35.6-37.2-39.7-40.2-43.9-44.0-47.9-50.0-50.6-50.0-54.2-57.1-61.9-60.4-61.2-63.8-65.6-72.10.0
Percentage of Assets1.61.50.70.60.20.2-0.1-0.3-0.7-0.7-1.1-1.2-1.5-1.7-2.3-2.0-2.3-2.4-2.8-2.9-3.5-3.7-4.2-4.5-4.9-4.9-5.5-5.9-6.2-6.2-7.1-7.5-7.7-7.8-8.3-8.6-9.3-9.6-9.4-9.7-10.2-10.7-11.30.00.00.0-12.60.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value3.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.03.02.02.0
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 Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Additional Paid In Capital Common Stock

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:AdditionalPaidInCapitalCommonStock


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value53895371536552255217520751135104509750875088508350765037501950135006492749164908490648974837482948124783477447674761474647154708471047034669466246644641462746224621459945884560
Percentage of AdditionalPaidInCapitalCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets18.018.118.117.818.319.019.119.620.220.520.721.321.822.021.822.722.922.822.723.524.024.423.824.825.024.924.925.926.926.527.127.727.027.227.328.128.628.728.129.029.029.429.429.9

us-gaap:AdditionalPaidInCapitalCommonStock dei:LegalEntity

cms:ConsumersEnergyCompany


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value6299617460246024602457245374537453745049469946994699454944494449444942493999399939993874372437243724372435743574357234073257325732573257310731073107310729572957295729572832
Percentage of AdditionalPaidInCapitalCommonStock116.9115.0112.3115.3115.5109.9105.1105.3105.499.392.492.492.690.388.688.788.986.281.381.581.579.177.077.177.477.974.975.075.071.869.169.269.269.366.566.666.666.963.964.064.064.361.7
Percentage of Assets21.020.820.320.621.120.920.020.721.220.419.219.720.219.919.320.120.319.718.519.219.519.318.319.119.419.418.619.420.219.018.719.218.718.918.118.719.119.218.018.518.518.918.1
Percentage of Assets cms:ConsumersEnergyCompany24.524.423.724.324.023.622.723.424.022.921.321.922.121.721.121.822.021.420.021.121.421.020.020.720.820.920.021.121.820.920.120.219.820.019.119.720.020.418.919.619.619.819.1

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value4874372141717051-25.0-83.0-182.0-166.0-271.0-278.0-346.0-383.0-531.0-434.0-512.0-511.0-616.0-607.0-706.0-744.0-855.0-881.0-949.0-936.0-1058.0-1080.0-1099.0-1110.0-1242.0-1276.0-1334.0-1346.0-1423.0-1426.0-1511.0-1548.0-1553.0-1542.0-1628.0-1675.0-1757.0-1927.0
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.61.50.70.60.20.2-0.1-0.3-0.7-0.7-1.1-1.2-1.5-1.7-2.3-2.0-2.3-2.4-2.8-2.9-3.5-3.7-4.2-4.5-4.9-4.9-5.5-5.9-6.2-6.2-7.1-7.5-7.7-7.8-8.3-8.6-9.3-9.6-9.4-9.7-10.2-10.7-11.3-12.6

us-gaap:RetainedEarningsAccumulatedDeficit dei:LegalEntity

cms:ConsumersEnergyCompany


Retained
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value183517501690168816311529151315041415141813641373134013151173121311431128106510871040967950931876925832797798810724711665667598611593515554569511512463
Percentage of RetainedEarningsAccumulatedDeficit376.8400.5789.7987.12330.02998.0-6052.0-1812.0-777.5-854.2-503.3-493.9-387.3-343.3-220.9-279.5-223.2-220.7-172.9-179.1-147.3-130.0-111.1-105.7-92.3-98.8-78.6-73.8-72.6-73.0-58.3-55.7-49.9-49.6-42.0-42.8-39.2-33.3-35.7-36.9-31.4-30.6-26.4
Percentage of Assets6.15.95.75.85.75.65.65.85.65.75.65.75.75.85.15.55.25.24.95.25.14.84.74.84.64.84.34.34.54.54.24.23.83.93.53.73.63.23.43.63.23.33.0
Percentage of Assets cms:ConsumersEnergyCompany7.16.96.76.86.56.36.46.66.36.46.26.46.36.35.66.05.75.75.35.75.65.25.15.24.95.24.74.74.95.04.54.44.14.13.73.93.83.43.53.83.43.43.1

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value-82000000.0-84000000.0-86000000.0-79000000.0-76000000.0-76000000.0-73000000.0-67000000.0-67000000.0-66000000.0-65000000.0-59000000.0-61000000.0-61000000.0-50000000.0-47000000.0-48000000.0-49000000.0-50000000.0-45000000.0-47000000.0-47000000.0-47000000.0-49000000.0-48000000.0-48000000.0-49000000.0-20000000.0-20000000.0-21000000.0-22000000.0-39000000.0-56000000.0-54000000.0-55000000.0-43000000.0-45000000.0-47000000.0-49000000.0-40000000.0-38000000.0-40000000.0-40000000.0-33000000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.2-0.3-0.3-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.3-0.2-0.3-0.3-0.1-0.1-0.1-0.1-0.2-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.2-0.3-0.3-0.2

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax dei:LegalEntity

cms:ConsumersEnergyCompany


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-312013-09-302013-06-302013-03-312012-12-312012-06-302012-03-312011-12-312010-12-31
Value-35000000.0-36000000.0-36000000.0-27000000.0-28000000.0-28000000.0-28000000.0-20000000.0-20000000.0-21000000.0-21000000.0-27000000.0-29000000.0-29000000.0-12000000.0-8000000.0-8000000.0-9000000.0-3000000.0-3000000.0-1000000.0-3000000.0-6000000.0-11000000.0-12000000.0-11000000.0-7000000.02000000.02000000.0-2000000.0-9000000.0-9000000.0-6000000.0-8000000.0-1000000.0-4000000.0-2000000.00
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax42.742.941.934.236.836.838.429.929.931.832.345.847.547.524.017.016.718.46.06.72.16.412.822.425.022.914.3-10.0-10.09.123.116.111.114.52.28.54.1-0.0
Percentage of Assets-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.1-0.1-0.1-0.00.00.0-0.0-0.1-0.1-0.0-0.0-0.0-0.0-0.00.0
Percentage of Assets cms:ConsumersEnergyCompany-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.1-0.1-0.1-0.00.00.0-0.0-0.1-0.1-0.0-0.0-0.0-0.0-0.00.0

Minority Interest

us-gaap:MinorityInterest

us-gaap:MinorityInterest


Minority
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value56957558157837373737373737373737373737373737373737373737373737373737374444444444444444444497
Percentage of MinorityInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.91.92.02.00.10.10.10.10.10.10.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.30.30.30.30.30.30.30.30.30.30.6

Stock Issued During Period Value New Issues

us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueNewIssues

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value18151408.01110610.08.010.07.05.07.0398.07.07.0808.08.03.09.0709.0172910.07.07.08.0377.07.08.0297.07.0238.05.07.0226.07.05.06.04.0
Percentage of StockIssuedDuringPeriodValueNewIssues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Minority Interest Decrease From Distributions To Noncontrolling Interest Holders

us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders us-gaap:StatementEquityComponents

us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders

us-gaap:NoncontrollingInterest


Minority
Period End2021-06-302020-12-312020-09-302020-06-302019-12-31
Value1000000.01000000.001000000.01000000.0
Percentage of MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders100.0100.00.0100.0100.0
Percentage of Assets0.00.00.00.00.0
Percentage of Assets us-gaap:NoncontrollingInterest0.00.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value5358321323485952013952105686171381497087085068047364632661130323370725307-9.0308635-26.0-21.0375841-39.0-50.0391657
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax35.342.47.323.744.311.422.014.642.231.57.59.850.137.828.55.232.635.322.224.217.51.626.336.618.4-0.623.136.4-1.6-1.427.540.9-2.3-3.529.233.4

us-gaap:NetCashProvidedByUsedInOperatingActivities dei:LegalEntity

cms:ConsumersEnergyCompany


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value559841133304543238350141491619194157378720506844776482706462174937271332812332681780.037886710.0-83.0300683
Percentage of NetCashProvidedByUsedInOperatingActivities104.5101.1100.887.491.3118.488.667.186.4100.3140.6105.453.4101.7100.0105.0100.8100.382.8105.771.6213.0100.598.3106.8-133.3107.8107.2-300.0-0.0100.8103.1-25.6166.076.7104.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax36.942.97.420.740.413.519.59.836.531.610.610.326.838.428.55.532.935.418.425.612.53.426.536.019.60.824.939.14.80.027.742.20.6-5.822.434.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany37.543.58.121.041.013.721.49.936.931.911.610.527.238.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-568000000.0-283000000.0-569000000.0-1130000000.0-609000000.0-559000000.0-604000000.0-802000000.0-735000000.0-675000000.0-791000000.0-807000000.0-552000000.0-456000000.0-514000000.0-548000000.0-460000000.0-346000000.0-437000000.0-346000000.0-528000000.0-388000000.0-323000000.0-293000000.0-412000000.0-328000000.0-297000000.0-313000000.0-306000000.0-281000000.0-243000000.0-228000000.0-277000000.0-236000000.0-278000000.0-212000000.0
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-37.5-14.4-31.6-77.0-45.3-31.8-33.6-55.6-54.6-34.5-43.2-53.1-39.1-24.3-28.9-35.9-31.7-18.9-29.8-13.7-30.4-26.9-23.0-14.8-24.7-21.8-22.3-18.0-18.9-19.2-17.8-11.1-16.5-16.4-20.7-10.8

us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity

cms:ConsumersEnergyCompany


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-472000000.0-458000000.0-546000000.0-707000000.0-451000000.0-542000000.0-554000000.0-557000000.0-524000000.0-502000000.0-536000000.0-521000000.0-470000000.0-444000000.0-473000000.0-476000000.0-420000000.0-382000000.0-379000000.0-315000000.0-442000000.0-332000000.0-318000000.0-295000000.0-379000000.0-299000000.0-289000000.0-312000000.0-268000000.0-238000000.0-217000000.0-228000000.0-219000000.0-196000000.0-242000000.0-202000000.0
Percentage of NetCashProvidedByUsedInInvestingActivities83.1161.896.062.674.197.091.769.571.374.467.864.685.197.492.086.991.3110.486.791.083.785.698.5100.792.091.297.399.787.684.789.3100.079.183.187.195.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-31.2-23.3-30.4-48.2-33.6-30.8-30.9-38.6-38.9-25.7-29.3-34.3-33.3-23.7-26.6-31.2-29.0-20.9-25.8-12.5-25.5-23.0-22.6-14.9-22.7-19.8-21.7-17.9-16.5-16.3-15.9-11.1-13.0-13.6-18.1-10.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany-31.7-23.7-33.2-48.9-34.0-31.2-33.9-39.1-39.4-25.9-32.0-34.8-33.8-24.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-199.0-210.064-264.07571062-67.0691234150462523118-229.039200-35.0-94.0-289.032113788-96.06170278-182.0-125.0-130.0-69.061-61.0-133.0446-332.0221
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-13.1-10.73.6-18.056.460.4-3.747.917.47.725.334.48.4-12.22.213.1-2.4-5.1-19.712.77.96.1-6.83.14.218.4-13.7-7.2-8.0-4.74.5-3.0-7.930.9-24.811.2

us-gaap:NetCashProvidedByUsedInFinancingActivities dei:LegalEntity

cms:ConsumersEnergyCompany


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-53.0-384.0225-603.0509904-52.0488181-109.0360126222-195.0-53.011395-206.029-171.044196-123.0-68.0-1.0190-62.0-281.0-98.0-155.0-108.03.047192-329.071
Percentage of NetCashProvidedByUsedInFinancingActivities26.6182.9351.6228.467.285.177.670.677.4-72.777.924.1188.185.2-135.956.5-271.4219.1-10.0-53.332.1222.7128.1-111.5-1.468.334.1224.875.4224.6-177.0-4.9-35.343.099.132.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-3.5-19.612.5-41.137.951.4-2.933.813.4-5.619.78.315.7-10.4-3.07.46.6-11.32.0-6.82.513.6-8.7-3.4-0.112.6-4.7-16.1-6.0-10.6-7.90.12.813.3-24.63.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany-3.6-19.913.7-41.738.452.0-3.234.213.6-5.621.58.416.0-10.50.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-232.0339-373.0-1046.0743704-276.0996792
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-15.317.3-20.7-71.355.340.0-15.46.95.04.7

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect dei:LegalEntity

cms:ConsumersEnergyCompany


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value34-1.0-188.0-1006.0601600-256.0721488.0
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect-14.7-0.350.496.280.985.292.872.7220.98.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.2-0.1-10.5-68.544.834.1-14.35.011.00.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany2.3-0.1-11.4-69.545.334.5-15.75.111.10.4

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization

us-gaap:DepreciationDepletionAndAmortization


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value244340281228223316263215216298244206204279229193197262214183176238186173169222182153151199165145137181158138130172142120122162140133131172
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Inventories

us-gaap:IncreaseDecreaseInInventories

us-gaap:IncreaseDecreaseInInventories


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value132-168.0-62.013372-171.0-93.0147111-209.0-90.0177127-228.0-115.0205157-201.0-111.016376-274.0-93.0181143-378.0-125.0269237-345.0-208.0259194-447.0-187.0218177-312.0-92.0310258-462.0-221.0318230-460.0
Percentage of IncreaseDecreaseInInventories100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInInventories dei:LegalEntity

cms:ConsumersEnergyCompany


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value133-168.0-60.013371-170.0-92.0148108-204.0-90.0173128-226.0-116.0204154-197.0-110.016273-270.0-91.0180141-374.0-127.0264237-338.0-210.0254193-442.0-188.0218165-302.0-92.0311256-458.0-222.0319230-459.0
Percentage of IncreaseDecreaseInInventories100.8100.096.8100.098.699.498.9100.797.397.6100.097.7100.899.1100.999.598.198.099.199.496.198.597.899.498.698.9101.698.1100.098.0101.098.199.598.9100.5100.093.296.8100.0100.399.299.1100.5100.3100.099.8

Increase Decrease In Other Operating Capital Net

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet


Increase
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value-24.061100-44.03.0-39.0147-67.012-42.0100-114.02.0-100.0165-78.0124-123.0130-65.0101-81.0121-89.068-98.013427-48.02211813-47.027113
Percentage of IncreaseDecreaseInOtherOperatingCapitalNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet dei:LegalEntity

cms:ConsumersEnergyCompany


Increase
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value-27.061111-18.0-18.01211022-15.0-27.068108-48.0-254.0136-31.0116-95.0104-44.084-73.051-96.0-3.015911022-49.02411415-44.024120
Percentage of IncreaseDecreaseInOtherOperatingCapitalNet112.5100.0111.040.9-600.0-30.874.8-32.8-125.064.368.0-94.7-2400.0254.082.439.793.577.280.067.783.290.142.1107.9-4.4-162.282.181.5102.1109.196.6115.493.688.9106.2

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value5358321323485952013952105686171381497087085068047364632661130323370725307-9.0308635-26.0-21.0375841-39.0-50.0391657
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax35.342.47.323.744.311.422.014.642.231.57.59.850.137.828.55.232.635.322.224.217.51.626.336.618.4-0.623.136.4-1.6-1.427.540.9-2.3-3.529.233.4

us-gaap:NetCashProvidedByUsedInOperatingActivities dei:LegalEntity

cms:ConsumersEnergyCompany


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value559841133304543238350141491619194157378720506844776482706462174937271332812332681780.037886710.0-83.0300683
Percentage of NetCashProvidedByUsedInOperatingActivities104.5101.1100.887.491.3118.488.667.186.4100.3140.6105.453.4101.7100.0105.0100.8100.382.8105.771.6213.0100.598.3106.8-133.3107.8107.2-300.0-0.0100.8103.1-25.6166.076.7104.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax36.942.97.420.740.413.519.59.836.531.610.610.326.838.428.55.532.935.418.425.612.53.426.536.019.60.824.939.14.80.027.742.20.6-5.822.434.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany37.543.58.121.041.013.721.49.936.931.911.610.527.238.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value17634915821813624316720793213108169139241-3.017292199771861241641061486720296948320410212680144671481006741139100135251458288
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.617.88.814.910.113.89.314.46.910.95.911.19.812.9-0.211.36.310.94.711.79.09.17.010.05.09.65.56.65.78.15.98.75.77.34.09.87.53.82.59.57.36.61.510.06.14.5

us-gaap:NetIncomeLoss us-gaap:ConsolidationItems

cms:CorporateAndReconcilingItems


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-30
Value-19.0-34.0-58.0-37.0-33.0-26.0-102.0-13.0-15.0-24.0-15.0-26.0-82.0-17.0-18.0
Percentage of NetIncomeLoss-10.8-9.7-36.7-17.0-24.3-10.7-61.1-6.3-16.1-22.2-8.9-18.72733.3-9.9-19.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.3-1.7-3.2-2.5-2.5-1.5-5.7-0.9-1.1-1.3-1.0-1.8-4.6-1.1-1.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:CorporateAndReconcilingItems0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, cms:ElectricUtility


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-30
Value154155912261191189122390671991306117694
Percentage of NetIncomeLoss87.544.457.6103.787.548.654.5107.796.862.0117.893.5-2033.3102.3102.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.27.95.115.48.96.75.115.56.73.713.19.23.411.56.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cms:ElectricUtility13.313.78.718.011.711.58.817.98.86.415.212.00.00.00.0

us-gaap:OperatingSegments, cms:EnerBank


Net
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value3324128.014171110.0
Percentage of NetIncomeLoss9.515.25.55.95.810.25.310.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.71.30.80.60.80.90.80.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cms:EnerBank0.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, cms:Enterprises


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-30
Value5.0142.0131.020157.010.01.04.014-54.08.07.0
Percentage of NetIncomeLoss2.84.01.36.00.78.29.03.410.80.92.410.11800.04.77.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.30.70.10.90.11.10.80.50.70.10.31.0-3.00.50.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cms:Enterprises20.046.78.361.95.9105.368.241.262.54.319.058.30.00.00.0

us-gaap:OperatingSegments, cms:GasUtility


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-30
Value36181994.041117114-10.08.064-19.021725.09.0
Percentage of NetIncomeLoss20.551.962.71.830.148.168.3-4.88.659.3-11.215.1-2400.02.99.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.49.25.50.33.16.76.4-0.70.63.5-1.31.54.00.30.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cms:GasUtility10.822.616.62.113.416.419.0-5.62.610.3-10.17.00.00.00.0

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value17134216221013724316820794213109169140241-2.017293199781861251641071486820297948420410212781144671491016741140101135251468488
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.317.49.014.310.213.89.414.47.010.96.011.19.912.9-0.111.36.410.94.811.79.19.17.110.05.09.65.56.65.78.15.98.85.87.34.09.97.63.82.59.67.46.61.510.16.34.5

us-gaap:ProfitLoss dei:LegalEntity

cms:ConsumersEnergyCompany


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1903361912301602352062139822613118015224213618110421111719513217213516084215118119109221119153100162781631227667155921537916088107
Percentage of ProfitLoss111.198.2117.9109.5116.896.7122.6102.9104.3106.1120.2106.5108.6100.4-6800.0105.2111.8106.0150.0104.8105.6104.9126.2108.1123.5106.4121.6126.6129.8108.3116.7120.5123.5112.5116.4109.4120.8113.4163.4110.791.1113.3316.0109.6104.8121.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.517.110.615.711.913.411.514.87.311.57.211.810.812.97.611.97.211.57.112.39.69.68.910.86.210.26.78.37.48.86.910.67.18.24.710.89.24.44.110.66.77.44.711.16.65.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany12.817.411.615.912.113.512.614.97.411.77.812.010.913.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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

cms:ConsumersEnergyCompany, us-gaap:RetainedEarnings


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1903361912301602352062139822613118015224213618110421111719513217213516084215118119109221119153100162781631227667155921537916088107
Percentage of ProfitLoss111.198.2117.9109.5116.896.7122.6102.9104.3106.1120.2106.5108.6100.4-6800.0105.2111.8106.0150.0104.8105.6104.9126.2108.1123.5106.4121.6126.6129.8108.3116.7120.5123.5112.5116.4109.4120.8113.4163.4110.791.1113.3316.0109.6104.8121.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.517.110.615.711.913.411.514.87.311.57.211.810.812.97.611.97.211.57.112.39.69.68.910.86.210.26.78.37.48.86.910.67.18.24.710.89.24.44.110.66.77.44.711.16.65.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ProfitLoss us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-09-302017-06-30
Value-5.0-7.04.0-8.01.01.00.01.01.00.01.00.01.0
Percentage of ProfitLoss-2.9-2.02.5-3.80.70.60.01.10.90.00.70.01.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.3-0.40.2-0.50.10.10.00.10.10.00.10.00.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-06-302011-03-312010-06-302010-03-31
Value1763491582181362431672079321310816913924117292199186124164148672029483204144100671001358288
Percentage of ProfitLoss102.9102.097.5103.899.3100.099.4100.098.9100.099.1100.099.3100.0100.098.9100.0100.099.2100.0100.098.5100.0100.098.8100.0100.099.0100.099.0100.097.6100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.617.88.814.910.113.89.314.46.910.95.911.19.812.911.36.310.911.79.09.110.05.09.66.65.78.17.37.53.87.36.66.14.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-568000000.0-283000000.0-569000000.0-1130000000.0-609000000.0-559000000.0-604000000.0-802000000.0-735000000.0-675000000.0-791000000.0-807000000.0-552000000.0-456000000.0-514000000.0-548000000.0-460000000.0-346000000.0-437000000.0-346000000.0-528000000.0-388000000.0-323000000.0-293000000.0-412000000.0-328000000.0-297000000.0-313000000.0-306000000.0-281000000.0-243000000.0-228000000.0-277000000.0-236000000.0-278000000.0-212000000.0
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-37.5-14.4-31.6-77.0-45.3-31.8-33.6-55.6-54.6-34.5-43.2-53.1-39.1-24.3-28.9-35.9-31.7-18.9-29.8-13.7-30.4-26.9-23.0-14.8-24.7-21.8-22.3-18.0-18.9-19.2-17.8-11.1-16.5-16.4-20.7-10.8

us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity

cms:ConsumersEnergyCompany


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-472000000.0-458000000.0-546000000.0-707000000.0-451000000.0-542000000.0-554000000.0-557000000.0-524000000.0-502000000.0-536000000.0-521000000.0-470000000.0-444000000.0-473000000.0-476000000.0-420000000.0-382000000.0-379000000.0-315000000.0-442000000.0-332000000.0-318000000.0-295000000.0-379000000.0-299000000.0-289000000.0-312000000.0-268000000.0-238000000.0-217000000.0-228000000.0-219000000.0-196000000.0-242000000.0-202000000.0
Percentage of NetCashProvidedByUsedInInvestingActivities83.1161.896.062.674.197.091.769.571.374.467.864.685.197.492.086.991.3110.486.791.083.785.698.5100.792.091.297.399.787.684.789.3100.079.183.187.195.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-31.2-23.3-30.4-48.2-33.6-30.8-30.9-38.6-38.9-25.7-29.3-34.3-33.3-23.7-26.6-31.2-29.0-20.9-25.8-12.5-25.5-23.0-22.6-14.9-22.7-19.8-21.7-17.9-16.5-16.3-15.9-11.1-13.0-13.6-18.1-10.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany-31.7-23.7-33.2-48.9-34.0-31.2-33.9-39.1-39.4-25.9-32.0-34.8-33.8-24.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value441437620751423523534597492481502700450422457462381365448407410407462427327348452462359304425320306274366286281294258225208191
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment dei:LegalEntity

cms:ConsumersEnergyCompany


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value440433575659416520526596487476483480445414436455380361442401407406444426322345450463358302425316306273365285278294258224208186
Percentage of PaymentsToAcquirePropertyPlantAndEquipment99.899.192.787.798.399.498.599.899.099.096.268.698.998.195.498.599.798.998.798.599.399.896.199.898.599.199.6100.299.799.3100.098.8100.099.699.799.798.9100.0100.099.6100.097.4

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-199.0-210.064-264.07571062-67.0691234150462523118-229.039200-35.0-94.0-289.032113788-96.06170278-182.0-125.0-130.0-69.061-61.0-133.0446-332.0221
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-13.1-10.73.6-18.056.460.4-3.747.917.47.725.334.48.4-12.22.213.1-2.4-5.1-19.712.77.96.1-6.83.14.218.4-13.7-7.2-8.0-4.74.5-3.0-7.930.9-24.811.2

us-gaap:NetCashProvidedByUsedInFinancingActivities dei:LegalEntity

cms:ConsumersEnergyCompany


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-53.0-384.0225-603.0509904-52.0488181-109.0360126222-195.0-53.011395-206.029-171.044196-123.0-68.0-1.0190-62.0-281.0-98.0-155.0-108.03.047192-329.071
Percentage of NetCashProvidedByUsedInFinancingActivities26.6182.9351.6228.467.285.177.670.677.4-72.777.924.1188.185.2-135.956.5-271.4219.1-10.0-53.332.1222.7128.1-111.5-1.468.334.1224.875.4224.6-177.0-4.9-35.343.099.132.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-3.5-19.612.5-41.137.951.4-2.933.813.4-5.619.78.315.7-10.4-3.07.46.6-11.32.0-6.82.513.6-8.7-3.4-0.112.6-4.7-16.1-6.0-10.6-7.90.12.813.3-24.63.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cms:ConsumersEnergyCompany-3.6-19.913.7-41.738.452.0-3.234.213.6-5.621.58.416.0-10.50.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Proceeds From Issuance Of Long Term Debt

us-gaap:ProceedsFromIssuanceOfLongTermDebt

us-gaap:ProceedsFromIssuanceOfLongTermDebt


Proceeds
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value8260.0115511987562146299317232505442505251850.0923274446299304990.00.01000.08780.05500.03504252503505104003900.00.03750.05505500.0300
Percentage of ProceedsFromIssuanceOfLongTermDebt100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.00.00.0100.00.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.00.00.0100.00.0100.0100.00.0100.0

us-gaap:ProceedsFromIssuanceOfLongTermDebt dei:LegalEntity

cms:ConsumersEnergyCompany


Proceeds
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312017-09-302017-06-302017-03-312016-12-312014-12-312013-12-312013-09-302012-12-312012-09-302011-12-312010-12-31
Value4260.0655873756212970.015620.03001850.03490.00.00.03253503500.0300
Percentage of ProceedsFromIssuanceOfLongTermDebt51.60.056.772.9100.0100.064.30.090.70.057.1100.00.037.80.00.00.092.9100.068.60.054.5

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt

us-gaap:RepaymentsOfLongTermDebt


Repayments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value162.07169023902.011566314790116545480180312180134755131731230761112611262187275263626043510.03611945134591138.0279134428431834
Percentage of RepaymentsOfLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RepaymentsOfLongTermDebt dei:LegalEntity

cms:ConsumersEnergyCompany


Repayments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3134103630.0130.03132158630.03300.01121801325013173761126111218710.0111110.043510.03619.038431010.09.09.09.01478.03189.0
Percentage of RepaymentsOfLongTermDebt43.745.593.10.011.30.099.727.274.10.068.80.035.9100.0100.052.62.5100.0100.0100.020.6100.04.6100.03.642.330.63.8100.0100.0100.04.674.967.58.8112.53.269.233.39.5100.026.5

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:EffectiveIncomeTaxRateContinuingOperations


Effective
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-0.813.00.814.0760.0240.10.001-0.005-0.0030.184-0.0020.0050.0040.1420.178-0.0280.0040.3250.0080.0090.0030.3110.00400.0050.3310.005-0.00100.34-0.0060.0080.0020.397-0.0020.0020.0070.3880.0050.039-0.0950.367-0.002-0.007
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectiveIncomeTaxRateContinuingOperations dei:LegalEntity

cms:ConsumersEnergyCompany


Effective
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value0.314.3-0.317.6320.010.158-0.0040.0050.0050.1930.0060.009-0.0010.1540.046-0.0250.0040.3240.0050.0050.0090.323-0.0040.0010.0020.3380.0020.0010.0040.344-0.0030.0020.0050.3890.006-0.002-0.0060.406-0.003-0.003-0.0020.3720.001-0.003
Percentage of EffectiveIncomeTaxRateContinuingOperations-37.5110.0-37.5125.341.7158.0-400.0-100.0-166.7104.9-300.0180.0-25.0108.525.889.3100.099.762.555.6300.0103.9-100.00.040.0102.140.0-100.00.0101.250.025.0250.098.0-300.0-100.0-85.7104.6-60.0-7.72.1101.4-50.042.9

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities

us-gaap:DeferredTaxLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value18631655148712692287201717482275201820451858
Percentage of DeferredTaxLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilities dei:LegalEntity

cms:ConsumersEnergyCompany


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value20941864180916403042271024862350211721511986
Percentage of DeferredTaxLiabilities112.4112.6121.7129.2133.0134.4142.2103.3104.9105.2106.9

Deferred Tax Assets Net

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsNet


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value91666581188996276280278593510341240
Percentage of DeferredTaxAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsNet dei:LegalEntity

cms:ConsumersEnergyCompany


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value612429480533254126143180232261488
Percentage of DeferredTaxAssetsNet66.864.559.260.026.416.517.822.924.825.239.4

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits

us-gaap:UnrecognizedTaxBenefits


Unrecognized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value252319145.06.05.04.01.04.04.06265
Percentage of UnrecognizedTaxBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:UnrecognizedTaxBenefits dei:LegalEntity

cms:ConsumersEnergyCompany


Unrecognized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value313428215.06.05.04.01.04.03.05755
Percentage of UnrecognizedTaxBenefits124.0147.8147.4150.0100.0100.0100.0100.0100.0100.075.091.984.6

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:DeferredTaxAssetsValuationAllowance


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value1.02.08.0155.04.02.02.03.02019
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cms:AdjustmentsToAdditionalPaidInCapitalStockholderContribution dei:LegalEntity, us-gaap:StatementEquityComponents

cms:AdjustmentsToAdditionalPaidInCapitalStockholderContribution

cms:ConsumersEnergyCompany, us-gaap:AdditionalPaidInCapital


Adjustments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value1251500.00.03003500.00.03253500.00.01501000.00.02002500.00.01251500.00.00.01500.01801651500.0
Percentage of AdjustmentsToAdditionalPaidInCapitalStockholderContribution100.0100.00.00.0100.0100.00.00.0100.0100.00.00.0100.0100.00.00.0100.0100.00.00.0100.0100.00.00.00.0100.00.0100.0100.0100.00.0

cms:DefinedBenefitPlanAmortizationOfSettlementLoss dei:LegalEntity, us-gaap:RetirementPlanType

cms:DefinedBenefitPlanAmortizationOfSettlementLoss

cms:ConsumersEnergyCompany, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-31
Value2000000.01000000.0
Percentage of DefinedBenefitPlanAmortizationOfSettlementLoss100.0100.0

cms:DefinedBenefitPlanAmortizationOfSettlementLoss us-gaap:RetirementPlanType

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-31
Value2000000.01000000.0
Percentage of DefinedBenefitPlanAmortizationOfSettlementLoss100.0100.0

cms:EffectiveIncomeTaxRateReconciliationAMTSequestrationAmount

cms:EffectiveIncomeTaxRateReconciliationAMTSequestrationAmount


Effective
Period End2020-12-31
Value0
Percentage of EffectiveIncomeTaxRateReconciliationAMTSequestrationAmount0.0

cms:EffectiveIncomeTaxRateReconciliationAMTSequestrationPercent

cms:EffectiveIncomeTaxRateReconciliationAMTSequestrationPercent


Effective
Period End2020-09-302020-06-302020-03-312019-06-302019-03-31
Value-1.2790.012-0.03300
Percentage of EffectiveIncomeTaxRateReconciliationAMTSequestrationPercent100.0100.0100.00.00.0

cms:EffectiveIncomeTaxRateReconciliationRegulatoryTaxBenefits

cms:EffectiveIncomeTaxRateReconciliationRegulatoryTaxBenefits


Effective
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-31
Value-1.4850-0.01500-0.01500-0.05-0.0010.001-0.043-0.0010.001-0.04700-0.0490.0010-0.054
Percentage of EffectiveIncomeTaxRateReconciliationRegulatoryTaxBenefits100.00.0100.00.00.0100.00.00.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.00.0100.0

cms:EffectiveIncomeTaxRateReconciliationRegulatoryTaxBenefits dei:LegalEntity

cms:ConsumersEnergyCompany


Effective
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-31
Value-1.0840.003-0.0190.0080.007-0.0250.0030.001-0.0480.0010.002-0.0420.0010.001-0.0420.0010.001-0.0440.0020.003-0.048
Percentage of EffectiveIncomeTaxRateReconciliationRegulatoryTaxBenefits73.00.0126.70.00.0166.70.00.096.0-100.0200.097.7-100.0100.089.40.00.089.8200.00.088.9

cms:EffectiveIncomeTaxRateReconciliationRegulatoryTaxBenefitsPercent

cms:EffectiveIncomeTaxRateReconciliationRegulatoryTaxBenefitsPercent


Effective
Period End2021-06-302021-03-312020-06-302020-03-31
Value-0.3-3.0-0.1-1.5
Percentage of EffectiveIncomeTaxRateReconciliationRegulatoryTaxBenefitsPercent100.0100.0100.0100.0

cms:EffectiveIncomeTaxRateReconciliationRegulatoryTaxBenefitsPercent dei:LegalEntity

cms:ConsumersEnergyCompany


Effective
Period End2021-06-302021-03-312020-06-302020-03-31
Value0.7-3.70.3-1.9
Percentage of EffectiveIncomeTaxRateReconciliationRegulatoryTaxBenefitsPercent-233.3123.3-300.0126.7

cms:FinancingIncome

cms:FinancingIncome


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3.075767165676362565450434039
Percentage of FinancingIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cms:FinancingIncome dei:LegalEntity

cms:ConsumersEnergyCompany


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3.05.05.03.04.05.02.04.03.05.04.03.04.04.0
Percentage of FinancingIncome100.06.76.64.26.27.53.26.55.49.38.07.010.010.3

cms:FinancingIncome dei:LegalEntity, us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

cms:ConsumersEnergyCompany, us-gaap:OperatingSegments, cms:ElectricUtility


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2.03.04.02.02.03.02.03.01.03.03.03.02.02.0
Percentage of FinancingIncome66.74.05.32.83.14.53.24.81.85.66.07.05.05.1

cms:ConsumersEnergyCompany, us-gaap:OperatingSegments, cms:GasUtility


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1.02.01.01.02.02.00.01.02.02.01.00.02.02.0
Percentage of FinancingIncome33.32.71.31.43.13.00.01.63.63.72.00.05.05.1

cms:FinancingIncome us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, cms:ElectricUtility


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2.03.04.02.02.03.02.03.01.03.03.03.02.02.0
Percentage of FinancingIncome66.74.05.32.83.14.53.24.81.85.66.07.05.05.1

us-gaap:OperatingSegments, cms:EnerBank


Financing
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value707168616261585349
Percentage of FinancingIncome93.393.495.893.892.596.893.594.690.7

us-gaap:OperatingSegments, cms:GasUtility


Financing
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1.02.01.01.02.02.00.01.02.02.01.00.02.02.0
Percentage of FinancingIncome33.32.71.31.43.13.00.01.63.63.72.00.05.05.1

cms:ForwardContractIndexedToIssuersEquityAggregateSalesPrice us-gaap:SubsidiarySaleOfStock

cms:ForwardContractIndexedToIssuersEquityAggregateSalesPrice

us-gaap:ForwardContracts


Forward
Period End2020-09-302020-06-302020-03-31
Value52150150
Percentage of ForwardContractIndexedToIssuersEquityAggregateSalesPrice100.0100.0100.0

cms:InterestAndDividendIncomeRelatedParties

cms:InterestAndDividendIncomeRelatedParties


Interest
Period End2020-12-312020-09-302020-06-302020-03-312019-06-302019-03-31
Value0007000000.000
Percentage of InterestAndDividendIncomeRelatedParties0.00.00.0100.00.00.0

cms:InterestAndDividendIncomeRelatedParties dei:LegalEntity

cms:ConsumersEnergyCompany


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-06-302014-12-312014-09-302013-12-312013-09-302012-12-312012-09-302011-12-312011-09-30
Value2000000.01000000.01000000.02000000.01000000.01000000.02000000.01000000.01000000.01000000.01000000.01000000.0001000000.001000000.001000000.001000000.001000000.01000000.01000000.0
Percentage of InterestAndDividendIncomeRelatedParties0.00.00.00.00.014.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cms:MinorityInterestIncreaseFromContributionFromNoncontrollingInterestHolders us-gaap:StatementEquityComponents

cms:MinorityInterestIncreaseFromContributionFromNoncontrollingInterestHolders

us-gaap:NoncontrollingInterest


Minority
Period End2021-06-302021-03-312020-12-312020-09-30
Value0.01.00.031
Percentage of MinorityInterestIncreaseFromContributionFromNoncontrollingInterestHolders0.0100.00.0100.0

cms:NoncontrollingInterestIncreaseFromAssetAcquisitionVIEConsolidation us-gaap:StatementEquityComponents

cms:NoncontrollingInterestIncreaseFromAssetAcquisitionVIEConsolidation

us-gaap:NoncontrollingInterest


Noncontrolling
Period End2020-12-312020-09-30
Value0.0101
Percentage of NoncontrollingInterestIncreaseFromAssetAcquisitionVIEConsolidation0.0100.0

cms:OtherNonoperatingIncomeExpenseRetirementBenefitsNet

cms:OtherNonoperatingIncomeExpenseRetirementBenefitsNet


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value4041282930312322232322222224143.04.03.010.01110.010.0
Percentage of OtherNonoperatingIncomeExpenseRetirementBenefitsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cms:OtherNonoperatingIncomeExpenseRetirementBenefitsNet dei:LegalEntity

cms:ConsumersEnergyCompany


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value3838272828292121222120212022133.02.03.09.09.010.09.0
Percentage of OtherNonoperatingIncomeExpenseRetirementBenefitsNet95.092.796.496.693.393.591.395.595.791.390.995.590.991.792.9100.050.0100.090.081.8100.090.0

cms:PurchasedPowerRelatedParties

cms:PurchasedPowerRelatedParties


Purchased
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value17181913141822191618222119192221212221222122222117232321222423212323222320221823202122212121
Percentage of PurchasedPowerRelatedParties100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cms:ReductionOfIncomeTaxExpense dei:LegalEntity

cms:ReductionOfIncomeTaxExpense

cms:ConsumersEnergyCompany


Reduction
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-312014-09-30
Value1.02.05.00.00.07.09.08.08.014119.06.0139.0118.01110.09.09.07.0
Percentage of ReductionOfIncomeTaxExpense100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cms:RestructuringAndRelatedCostIncurredCostCapitalized us-gaap:BalanceSheetLocation, us-gaap:RestructuringCostAndReserve, us-gaap:RestructuringPlan

cms:RestructuringAndRelatedCostIncurredCostCapitalized

us-gaap:PropertyPlantAndEquipment, cms:RetentionBenefits, cms:D.E.KarnGeneratingComplex


Restructuring
Period End2021-03-312020-12-312020-09-30
Value01000000.01000000.0
Percentage of RestructuringAndRelatedCostIncurredCostCapitalized0.0100.0100.0

cms:RestructuringAndRelatedCostIncurredCostCapitalized us-gaap:RestructuringCostAndReserve, us-gaap:RestructuringPlan

cms:RetentionBenefits, cms:D.E.KarnGeneratingComplex


Restructuring
Period End2020-12-312020-09-30
Value1000000.00
Percentage of RestructuringAndRelatedCostIncurredCostCapitalized100.00.0

cms:TaxCarryforwardAmountIncreaseDecrease dei:LegalEntity, us-gaap:TaxCreditCarryforward

cms:TaxCarryforwardAmountIncreaseDecrease

cms:ConsumersEnergyCompany, us-gaap:Research


Tax
Period End2020-12-312020-03-312018-03-31
Value08000000.08000000.0
Percentage of TaxCarryforwardAmountIncreaseDecrease0.0100.0100.0

cms:TaxCarryforwardAmountIncreaseDecrease us-gaap:TaxCreditCarryforward

us-gaap:Research


Tax
Period End2020-12-312020-03-31
Value09000000.0
Percentage of TaxCarryforwardAmountIncreaseDecrease0.0112.5

cms:UtilitiesOperatingExpensePurchasedPowerRelatedParties dei:LegalEntity

cms:UtilitiesOperatingExpensePurchasedPowerRelatedParties

cms:ConsumersEnergyCompany


Utilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value17181913141822191618222219202323
Percentage of UtilitiesOperatingExpensePurchasedPowerRelatedParties100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cms:VariableInterestEntityCapacityCommitted us-gaap:ConsolidatedEntities, us-gaap:Ownership

cms:VariableInterestEntityCapacityCommitted

us-gaap:VariableInterestEntityPrimaryBeneficiary, cms:AviatorWind


Variable
Period End2020-07-31
Value420.0
Percentage of VariableInterestEntityCapacityCommitted100.0

cms:VariableInterestEntityMaximumCapacity us-gaap:ConsolidatedEntities, us-gaap:Ownership

cms:VariableInterestEntityMaximumCapacity

us-gaap:VariableInterestEntityPrimaryBeneficiary, cms:AviatorWind


Variable
Period End2020-07-31
Value525.0
Percentage of VariableInterestEntityMaximumCapacity100.0

us-gaap:CapitalExpendituresIncurredButNotYetPaid

us-gaap:CapitalExpendituresIncurredButNotYetPaid


Capital
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value51871.0-27.0729535-15.05199-1.01938102197.034112-21.0-19.05.017354-1.03111733-2.054116
Percentage of CapitalExpendituresIncurredButNotYetPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalExpendituresIncurredButNotYetPaid dei:LegalEntity

cms:ConsumersEnergyCompany


Capital
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value5084-26.0-1.0728537-15.0538515122690207.032101-18.0-17.08.015435-1.03111733-2.054116
Percentage of CapitalExpendituresIncurredButNotYetPaid98.096.6-2600.03.7100.089.5105.7100.0103.985.9-1500.063.268.488.2105.3100.094.190.285.789.5160.089.064.8100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries

us-gaap:CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries


Cash
Period End2021-06-302021-03-312020-12-31
Value104276188
Percentage of CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries100.0100.0100.0

us-gaap:ConcentrationRiskPercentage1 us-gaap:ConcentrationRiskByType, us-gaap:CreditScoreFico, us-gaap:StatementBusinessSegments

us-gaap:ConcentrationRiskPercentage1

us-gaap:CreditConcentrationRisk, cms:FICOScoreBetweenGoodAndExcellent, cms:EnerBank


Concentration
Period End2021-03-312020-03-31
Value86.00.85
Percentage of ConcentrationRiskPercentage1100.0100.0

us-gaap:ConcentrationRiskPercentage1 us-gaap:ProductOrService, us-gaap:ConcentrationRiskByType, us-gaap:StatementBusinessSegments

cms:LoansOriginatedWithinLastFiveYears, us-gaap:CreditConcentrationRisk, cms:EnerBank


Concentration
Period End2021-03-312020-03-31
Value96.00.97
Percentage of ConcentrationRiskPercentage1111.6114.1

us-gaap:ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesIssuanceOfEquityBySubsidiaryToNoncontrollingInterests us-gaap:StatementEquityComponents

us-gaap:ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesIssuanceOfEquityBySubsidiaryToNoncontrollingInterests

us-gaap:NoncontrollingInterest


Consolidation
Period End2020-12-312020-09-30
Value0.0417
Percentage of ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesIssuanceOfEquityBySubsidiaryToNoncontrollingInterests0.0100.0

us-gaap:DebtInstrumentBasisSpreadOnVariableRate1 us-gaap:LongtermDebtType, us-gaap:StatementScenario

us-gaap:DebtInstrumentBasisSpreadOnVariableRate1

cms:TermLoanFacility, us-gaap:ScenarioForecast


Debt
Period End2022-10-31
Value0.0175
Percentage of DebtInstrumentBasisSpreadOnVariableRate1100.0

us-gaap:DebtInstrumentBasisSpreadOnVariableRate1 us-gaap:StatementScenario, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

srt:ScenarioForecast, cms:TermLoanFacilityDue2025, cms:TermLoanFacility


Debt
Period End2022-10-31
Value0.0175
Percentage of DebtInstrumentBasisSpreadOnVariableRate1100.0

us-gaap:DebtInstrumentInterestRateDuringPeriod us-gaap:LongtermDebtType, us-gaap:StatementScenario

us-gaap:DebtInstrumentInterestRateDuringPeriod

cms:TermLoanFacility, us-gaap:ScenarioForecast


Debt
Period End2022-10-31
Value0.04952
Percentage of DebtInstrumentInterestRateDuringPeriod100.0

us-gaap:DebtInstrumentInterestRateDuringPeriod us-gaap:StatementScenario, us-gaap:DebtInstrument, us-gaap:LongtermDebtType

srt:ScenarioForecast, cms:TermLoanFacilityDue2025, cms:TermLoanFacility


Debt
Period End2022-10-31
Value0.04952
Percentage of DebtInstrumentInterestRateDuringPeriod100.0

us-gaap:DeferredIncomeTaxesAndTaxCredits

us-gaap:DeferredIncomeTaxesAndTaxCredits


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value27483045286761291743923023372196642904592596837753699494135102557848873491604218751.07322986542
Percentage of DeferredIncomeTaxesAndTaxCredits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredIncomeTaxesAndTaxCredits dei:LegalEntity

cms:ConsumersEnergyCompany


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3851416923440.0-4.02417835.0323.0-41.0478869699068621719.0-15.039199-2.020462354434458531920763.04339139129-3.0-19.0
Percentage of DeferredIncomeTaxesAndTaxCredits140.7106.2136.7153.382.165.70.0-13.8141.239.590.216.7139.18.1-18.771.2209.576.7153.397.8115.391.2462.212.0-41.739.4406.1-4.957.145.141.869.289.650.6170.658.231.747.6422.24.04300.053.4631.8131.6-4.6-45.2

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

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses

cms:ConsumersEnergyCompany, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-2000000.0-2000000.0-4000000.0-4000000.0-3000000.0-4000000.0-6000000.0-7000000.0-6000000.0-7000000.0-4000000.0-4000000.0-4000000.0-4000000.0-5000000.0-8000000.0-8000000.0-8000000.0-6000000.0-5000000.0-5000000.0
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cms:ConsumersEnergyCompany, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value-24000000.0-25000000.0-22000000.0-21000000.0-21000000.0-12000000.0-11000000.0-12000000.0-17000000.0-18000000.0-18000000.0-19000000.0-19000000.0-20000000.0-16000000.0-17000000.0
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses1200.01250.0550.0700.0525.0171.4183.3171.4425.0450.0450.0237.5237.5250.0320.0340.0

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-2000000.0-2000000.0-4000000.0-4000000.0-3000000.0-4000000.0-6000000.0-7000000.0-6000000.0-7000000.0-4000000.0-3000000.0-4000000.0-4000000.0-6000000.0-7000000.0-8000000.0-8000000.0-5000000.0-5000000.0-6000000.0
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.075.0100.0100.0120.087.5100.0100.083.3100.0120.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value-26000000.0-25000000.0-23000000.0-22000000.0-22000000.0-12000000.0-12000000.0-12000000.0-19000000.0-19000000.0-18000000.0-20000000.0-20000000.0-20000000.0-17000000.0-18000000.0
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses1300.01250.0575.0733.3550.0171.4200.0171.4475.0475.0450.0250.0250.0250.0340.0360.0

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

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit

cms:ConsumersEnergyCompany, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-13000000.0-13000000.0-14000000.0-13000000.0-13000000.0-14000000.0-15000000.0-15000000.0-16000000.0-15000000.0-16000000.0-17000000.0-16000000.0-16000000.0-14000000.0-8000000.0-8000000.0-9000000.0-10000000.0-10000000.0-10000000.0
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cms:ConsumersEnergyCompany, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value1000000.01000000.001000000.0001000000.001000000.001000000.01000000.01000000.01000000.01000000.01000000.0
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit-7.7-7.7-0.0-7.7-0.0-0.0-6.2-0.0-5.9-0.0-6.2-12.5-12.5-11.1-10.0-10.0

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-13000000.0-13000000.0-14000000.0-14000000.0-14000000.0-14000000.0-15000000.0-16000000.0-15000000.0-16000000.0-17000000.0-16000000.0-17000000.0-17000000.0-14000000.0-8000000.0-9000000.0-9000000.0-10000000.0-10000000.0-11000000.0
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit100.0100.0100.0107.7107.7100.0100.0106.793.8106.7106.294.1106.2106.2100.0100.0112.5100.0100.0100.0110.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value1000000.01000000.001000000.0001000000.001000000.001000000.01000000.01000000.01000000.01000000.01000000.0
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit-7.7-7.7-0.0-7.7-0.0-0.0-6.2-0.0-5.9-0.0-6.2-12.5-12.5-11.1-10.0-10.0

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

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets

cms:ConsumersEnergyCompany, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value262523232423202120212322232321212121202020
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cms:ConsumersEnergyCompany, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value49494546453838383534353837373536
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets188.5196.0195.7191.7195.7181.0190.0181.0159.1147.8152.2181.0176.2176.2175.0180.0

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value272725252525222222222424252423222322202221
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets103.8108.0108.7108.7104.2108.7110.0104.8110.0104.8104.3109.1108.7104.3109.5104.8109.5104.8100.0110.0105.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value52524748484041403837373938383637
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets200.0208.0204.3200.0208.7190.5205.0190.5172.7160.9160.9185.7181.0181.0180.0185.0

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

us-gaap:DefinedBenefitPlanInterestCost

cms:ConsumersEnergyCompany, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value5.06.07.08.08.08.010.010.010.010.08.08.09.08.011121313111211
Percentage of DefinedBenefitPlanInterestCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cms:ConsumersEnergyCompany, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value14142019202323232221212222212021
Percentage of DefinedBenefitPlanInterestCost280.0233.3250.0237.5250.0230.0230.0230.0275.0233.3262.5183.3169.2161.5166.7190.9

us-gaap:DefinedBenefitPlanInterestCost us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value5.06.08.08.09.08.010.01110.010.07.09.09.09.012131313111211
Percentage of DefinedBenefitPlanInterestCost100.0100.0114.3100.0112.5100.0100.0110.0100.0100.087.5112.5100.0112.5109.1108.3100.0100.0100.0100.0100.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value151518202021252424252322232221232222212122
Percentage of DefinedBenefitPlanInterestCost300.0250.0257.1250.0250.0262.5250.0240.0240.0250.0287.5275.0255.6275.0190.9191.7169.2169.2190.9175.0200.0

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

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

cms:ConsumersEnergyCompany, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-27.0-26.0-22.0-21.0-22.0-21.0-16.0-16.0-16.0-16.0-23.0-23.0-22.0-23.0-14.0-4.0-4.0-4.0-9.0-9.0-9.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cms:ConsumersEnergyCompany, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value5.05.09.07.08.07.07.07.01716171516161313
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost-18.5-19.2-42.9-31.8-38.1-43.8-43.8-43.8-73.9-72.7-73.9-375.0-400.0-400.0-144.4-144.4

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-28.0-28.0-23.0-23.0-23.0-23.0-17.0-17.0-18.0-17.0-26.0-24.0-24.0-24.0-15.0-5.0-6.0-5.0-10.0-10.0-11.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost103.7107.7104.5109.5104.5109.5106.2106.2112.5106.2113.0104.3109.1104.3107.1125.0150.0125.0111.1111.1122.2

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value5.04.09.08.07.07.06.07.01617161716161314
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost-18.5-15.4-42.9-36.4-33.3-43.8-37.5-43.8-69.6-77.3-69.6-425.0-400.0-400.0-144.4-155.6

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1 dei:LegalEntity, us-gaap:RegulatoryAsset, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1

cms:ConsumersEnergyCompany, us-gaap:PensionCosts, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-08-31
Value-35000000.0
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1100.0

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1 us-gaap:RetirementPlanType

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2020-08-312020-09-30
Value-36000000.0-1000000.0
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements10.0102.9

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

us-gaap:DefinedBenefitPlanServiceCost

cms:ConsumersEnergyCompany, us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value5.04.04.03.04.04.03.03.04.03.04.04.04.04.05.05.04.05.04.04.05.0
Percentage of DefinedBenefitPlanServiceCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cms:ConsumersEnergyCompany, us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value131312121210.010.010.01211121111111110.0
Percentage of DefinedBenefitPlanServiceCost260.0325.0400.0300.0300.0333.3250.0333.3300.0275.0300.0220.0275.0220.0275.0200.0

us-gaap:DefinedBenefitPlanServiceCost us-gaap:RetirementPlanType

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value5.04.04.04.04.04.04.03.03.04.04.04.05.04.04.05.05.05.04.05.04.0
Percentage of DefinedBenefitPlanServiceCost100.0100.0100.0133.3100.0100.0133.3100.075.0133.3100.0100.0125.0100.080.0100.0125.0100.0100.0125.080.0

us-gaap:PensionPlansDefinedBenefit


Defined
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value13141312131210.01110.010.012121212111211111110.010.0
Percentage of DefinedBenefitPlanServiceCost260.0350.0325.0400.0325.0300.0333.3366.7250.0333.3300.0300.0300.0300.0220.0240.0275.0220.0275.0250.0200.0

us-gaap:DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax

us-gaap:DiscontinuedOperationsHeldforsale, cms:EnerBank


Discontinued
Period End2021-06-30
Value-5000000.0
Percentage of DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax100.0

us-gaap:DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax

us-gaap:DiscontinuedOperationsHeldforsale, cms:EnerBank


Discontinued
Period End2021-06-302020-06-30
Value2511
Percentage of DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax100.0100.0

us-gaap:DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax

us-gaap:DiscontinuedOperationsHeldforsale, cms:EnerBank


Discontinued
Period End2021-06-302020-06-30
Value3011
Percentage of DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax100.0100.0

us-gaap:DiscontinuedOperationTaxEffectOfDiscontinuedOperation

us-gaap:DiscontinuedOperationTaxEffectOfDiscontinuedOperation


Discontinued
Period End2021-06-302020-06-302012-12-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value7.03.00.00.00.04.00.00.01.0-3.00.06.0-1.0
Percentage of DiscontinuedOperationTaxEffectOfDiscontinuedOperation100.0100.00.00.00.0100.00.00.0100.0100.00.0100.0100.0

us-gaap:DiscontinuedOperationTaxEffectOfDiscontinuedOperation us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:DiscontinuedOperationsHeldforsale, cms:EnerBank


Discontinued
Period End2021-06-302020-06-30
Value7.03.0
Percentage of DiscontinuedOperationTaxEffectOfDiscontinuedOperation100.0100.0

us-gaap:DisposalGroupIncludingDiscontinuedOperationInterestExpense us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:DisposalGroupIncludingDiscontinuedOperationInterestExpense

us-gaap:DiscontinuedOperationsHeldforsale, cms:EnerBank


Disposal
Period End2021-06-302020-06-30
Value1114
Percentage of DisposalGroupIncludingDiscontinuedOperationInterestExpense100.0100.0

us-gaap:DisposalGroupIncludingDiscontinuedOperationOperatingExpense us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:DisposalGroupIncludingDiscontinuedOperationOperatingExpense

us-gaap:DiscontinuedOperationsHeldforsale, cms:EnerBank


Disposal
Period End2021-06-302020-06-30
Value2836
Percentage of DisposalGroupIncludingDiscontinuedOperationOperatingExpense100.0100.0

us-gaap:DisposalGroupIncludingDiscontinuedOperationRevenue us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:DisposalGroupIncludingDiscontinuedOperationRevenue

us-gaap:DiscontinuedOperationsHeldforsale, cms:EnerBank


Disposal
Period End2021-06-302020-06-30
Value6961
Percentage of DisposalGroupIncludingDiscontinuedOperationRevenue100.0100.0

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

us-gaap:DividendsCommonStockCash

cms:ConsumersEnergyCompany, us-gaap:RetainedEarnings


Dividends
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value10427618817357219196124100172139147126119175111881481381485815511510513212282120120135106106101939114443115829692104999154114
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStockCash us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Dividends
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value12612611511711711610910810910810110110210194949394868786868080808074757272686868676463636252535353-95.0343534
Percentage of DividendsCommonStockCash121.245.761.267.6205.353.055.687.1109.062.872.768.781.084.953.784.7105.763.562.358.8148.355.569.676.260.665.690.262.560.053.364.264.267.372.070.343.8146.553.963.455.257.651.0-96.037.464.829.8

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

us-gaap:DividendsPreferredStockCash

cms:ConsumersEnergyCompany, us-gaap:RetainedEarnings


Dividends
Period End2021-06-302020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-12-312014-09-302014-06-302013-12-312013-09-302013-06-302012-12-312012-09-302012-06-302011-12-312011-09-302011-06-302010-12-312010-09-302010-06-30
Value1.01.00.01.01.00.01.01.00.01.01.00.01.01.00.01.01.00.01.01.00.01.00.01.01.00.01.01.00.01.01.00.01.01.0
Percentage of DividendsPreferredStockCash100.0100.00.0100.0100.00.0100.0100.00.0100.0100.00.0100.0100.00.0100.0100.00.0100.0100.00.0100.00.0100.0100.00.0100.0100.00.0100.0100.00.0100.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate

us-gaap:EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate


Effective
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value-0.6-5.3-3.96-0.001-0.0390.0010-0.0350-0.0630.0290
Percentage of EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate100.0100.0100.0100.0100.0100.00.0100.00.0100.0100.00.0

us-gaap:EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate dei:LegalEntity

cms:ConsumersEnergyCompany


Effective
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value0.2-5.1-3.564-0.002-0.03400.001-0.0330.001-0.0610.0290
Percentage of EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate-33.396.290.0200.087.20.00.094.30.096.8100.00.0

us-gaap:EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities

us-gaap:EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities


Effective
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value0.44.72.97200.02800.0010.0240.0030.0020.015000.01
Percentage of EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities100.0100.0100.00.0100.00.0100.0100.0100.0100.0100.00.00.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities dei:LegalEntity

cms:ConsumersEnergyCompany


Effective
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value0.62.61.8840.0020.0140.0030.0030.010.0010.0040.0110.0010.0020.007
Percentage of EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities150.055.363.40.050.00.0300.041.733.3200.073.30.00.070.0

us-gaap:EffectiveIncomeTaxRateReconciliationOtherAdjustments

us-gaap:EffectiveIncomeTaxRateReconciliationOtherAdjustments


Effective
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-03-312011-09-302011-06-302011-03-312010-09-30
Value0.20.2-0.1940.001-0.007-0.006-0.002-0.004-0.0040.0030.003-0.008-0.002-0.010.001-0.004-0.01100.005-0.018-0.001-0.001-0.005-0.002-0.0020.0020.0010.002
Percentage of EffectiveIncomeTaxRateReconciliationOtherAdjustments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationOtherAdjustments dei:LegalEntity

cms:ConsumersEnergyCompany


Effective
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-30
Value-0.1-0.2-0.295-0.002-0.0030-0.001-0.003-0.00600.003-0.007-0.004-0.012-0.001-0.002-0.00900-0.015-0.0010.001-0.0070.0020.005-0.0090.001-0.010.0070-0.0050.002-0.003
Percentage of EffectiveIncomeTaxRateReconciliationOtherAdjustments-50.0-100.0152.1-200.042.9-0.050.075.0150.00.0100.087.5200.0120.0-100.050.081.80.00.083.3100.0-100.0140.00.00.0450.00.00.00.0-0.0-250.0200.0-150.0

us-gaap:EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes

us-gaap:EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes


Effective
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-30
Value0.35.14.65400.046000.0540.003-0.0010.057-0.02400.0470.004-0.0030.041000.048-0.0010.0010.0490.00100.04900.0050.042-0.0010.0010.0340
Percentage of EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes100.0100.0100.00.0100.00.00.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.00.0100.00.0100.0100.0100.0100.0100.00.0

us-gaap:EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes dei:LegalEntity

cms:ConsumersEnergyCompany


Effective
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-30
Value0.15.14.950.0010.04900.0010.0560.003-0.0040.062-0.0230.0010.04500.0020.04400.0010.047000.049000.048-0.003-0.0030.056-0.003-0.0010.0350
Percentage of EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes33.3100.0106.40.0106.50.00.0103.7100.0400.0108.895.80.095.70.0-66.7107.30.00.097.9-0.00.0100.00.00.098.00.0-60.0133.3300.0-100.0102.90.0

us-gaap:EffectiveIncomeTaxRateReconciliationTaxCreditsResearch

us-gaap:EffectiveIncomeTaxRateReconciliationTaxCreditsResearch


Effective
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value00.31.478-0.0120.034000.002-0.006-0.0060.028000.001
Percentage of EffectiveIncomeTaxRateReconciliationTaxCreditsResearch0.0100.0100.0100.0100.00.00.0100.0100.0100.0100.00.00.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationTaxCreditsResearch dei:LegalEntity

cms:ConsumersEnergyCompany


Effective
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value00.21.281-0.0120.031000.002-0.006-0.0060.027000.001
Percentage of EffectiveIncomeTaxRateReconciliationTaxCreditsResearch0.066.786.7100.091.20.00.0100.0100.0100.096.40.00.0100.0

us-gaap:FinancingReceivableAllowanceForCreditLossesRecovery

us-gaap:FinancingReceivableAllowanceForCreditLossesRecovery


Financing
Period End2021-03-312020-03-312013-12-312013-09-302013-06-302012-12-312012-09-302011-12-31
Value2000000.02000000.0001000000.02000000.0-1000000.02000000.0
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery100.0100.00.00.0100.0100.0100.0100.0

us-gaap:FinancingReceivableAllowanceForCreditLossesRecovery us-gaap:StatementBusinessSegments

cms:EnerBank


Financing
Period End2020-09-302020-06-30
Value2000000.01000000.0
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery0.00.0

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs


Financing
Period End2021-03-312020-03-312014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value12112.01.01.02.01.01.02.01.01.01.01.0
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableSignificantPurchases us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:StatementBusinessSegments

us-gaap:FinancingReceivableSignificantPurchases

cms:RetailInstallmentContracts, cms:EnerBank


Financing