CMS


Line plots across dimensions of each concept
Tables

Table of contents



us-gaap:CommonStockValue

us-gaap:CommonStockSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

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

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

us-gaap:CostsAndExpenses

us-gaap:OperatingIncomeLoss
dei:LegalEntity

us-gaap:InterestExpense
dei:LegalEntity

us-gaap:InterestExpenseDebt
dei:LegalEntity

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
dei:LegalEntity

us-gaap:NonoperatingIncomeExpense
dei:LegalEntity

us-gaap:IncomeTaxExpenseBenefit
dei:LegalEntity

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

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax
us-gaap:StatementEquityComponents

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax
dei:LegalEntity

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
dei:LegalEntity

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

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest

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

us-gaap:LiabilitiesAndStockholdersEquity
dei:LegalEntity

us-gaap:StockholdersEquity
dei:LegalEntity

us-gaap:AssetsCurrent
dei:LegalEntity

us-gaap:CashAndCashEquivalentsAtCarryingValue
dei:LegalEntity

us-gaap:AccountsReceivableNetCurrent
dei:LegalEntity

us-gaap:OtherAssetsCurrent
dei:LegalEntity

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:OtherAssetsNoncurrent
dei:LegalEntity

us-gaap:LiabilitiesCurrent
dei:LegalEntity

us-gaap:NotesPayableCurrent
dei:LegalEntity

us-gaap:LongTermDebtCurrent
dei:LegalEntity

us-gaap:AccountsPayableCurrent
dei:LegalEntity

us-gaap:TaxesPayableCurrent
dei:LegalEntity

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

us-gaap:LiabilitiesNoncurrent
dei:LegalEntity

us-gaap:LongTermDebtNoncurrent
dei:LegalEntity

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
dei:LegalEntity

us-gaap:MinorityInterest

us-gaap:OtherLiabilitiesNoncurrent
dei:LegalEntity

us-gaap:StockholdersEquity
dei:LegalEntity

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

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:NetCashProvidedByUsedInOperatingActivities
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInInvestingActivities
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInFinancingActivities
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInOperatingActivities
dei:LegalEntity

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

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

us-gaap:DepreciationDepletionAndAmortization

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet
dei:LegalEntity

us-gaap:IncreaseDecreaseInInventories
dei:LegalEntity

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:RepaymentsOfLongTermDebt
dei:LegalEntity

us-gaap:EffectiveIncomeTaxRateContinuingOperations
dei:LegalEntity

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

cms:EffectiveIncomeTaxRateReconciliationAMTSequestrationPercent

cms:EffectiveIncomeTaxRateReconciliationRegulatoryTaxBenefits
dei:LegalEntity

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

cms:InterestAndDividendIncomeRelatedParties
dei:LegalEntity
us-gaap:LitigationCase
cms:LossContingencyNumberOfLawsuits
us-gaap:StatementEquityComponents
cms:OtherChangesInNoncontrollingInterests

cms:OtherNonoperatingIncomeExpenseRetirementBenefitsNet
dei:LegalEntity

cms:PurchasedPowerRelatedParties
dei:LegalEntity
cms:ReductionOfIncomeTaxExpense

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

us-gaap:CapitalExpendituresIncurredButNotYetPaid
dei:LegalEntity

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
dei:LegalEntity

us-gaap:CommonStockDividendsPerShareDeclared
us-gaap:ConcentrationRiskByType, us-gaap:CreditScoreFico, us-gaap:StatementBusinessSegments
us-gaap:ConcentrationRiskPercentage1
us-gaap:ProductOrService, us-gaap:ConcentrationRiskByType, us-gaap:StatementBusinessSegments
us-gaap:ConsolidatedEntities, us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:VariableRate
us-gaap:DebtInstrumentBasisSpreadOnVariableRate1
us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:VariableRate
us-gaap:LongtermDebtType, us-gaap:StatementScenario
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
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:RetirementPlanType
us-gaap:DefinedBenefitPlanServiceCost
us-gaap:RetirementPlanType, dei:LegalEntity
us-gaap:StatementEquityComponents
us-gaap:DividendsCommonStockCash
us-gaap:StatementEquityComponents, dei:LegalEntity
us-gaap:StatementEquityComponents, dei:LegalEntity
us-gaap:DividendsPreferredStockCash

us-gaap:EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
dei:LegalEntity

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:StatementBusinessSegments
us-gaap:FinancingReceivableAllowanceForCreditLossesRecovery
us-gaap:StatementBusinessSegments
us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs
us-gaap:ForwardContractIndexedToIssuersEquityType
us-gaap:ForwardContractIndexedToIssuersEquityForwardRate

us-gaap:FuelCosts

us-gaap:IncomeLossFromEquityMethodInvestments

us-gaap:IncreaseDecreaseInAccountsAndOtherReceivables
dei:LegalEntity

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
dei:LegalEntity

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:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax
us-gaap:Range

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

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax
dei:LegalEntity

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax

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:ProceedsFromIssuanceOfCommonStock
us-gaap:SubsidiarySaleOfStock

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities
dei:LegalEntity

us-gaap:ProvisionForDoubtfulAccounts
us-gaap:StatementBusinessSegments
us-gaap:ProvisionForLoanLossesExpensed

us-gaap:PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity
dei:LegalEntity
dei:LegalEntity, us-gaap:PublicUtilitiesRegulatoryProceeding, us-gaap:StatementScenario
us-gaap:PublicUtilitiesApprovedRateIncreaseDecreaseAmount

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:UtilitiesOperatingExpenseMaintenanceAndOperations
dei:LegalEntity
us-gaap:UtilitiesOperatingExpensePurchasedPower
dei:LegalEntity
us-gaap:UtilitiesOperatingExpenseTaxes
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:VariableLeaseIncome

us-gaap:WeightedAverageNumberOfSharesIssuedBasic

cms:AccruedRateRefunds
dei:LegalEntity

cms:AssetsNoncurrentOtherThanPropertyPlantAndEquipment
dei:LegalEntity

cms:DebtInstrumentSupportedByThirdPartyCreditEnhancement
dei:LegalEntity

cms:DeferredPropertyTaxes
dei:LegalEntity

cms:FinanceLeaseLiabilityAndOtherNoncurrent
dei:LegalEntity

cms:LongTermDebtCurrentMaturitiesLeaseObligationAndOtherFinancingCurrent
dei:LegalEntity
us-gaap:FairValueByFairValueHierarchyLevel
cms:NonqualifiedDeferredCompensationPlanAssetsFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel, dei:LegalEntity
us-gaap:FairValueByFairValueHierarchyLevel
cms:NonqualifiedDeferredCompensationPlanLiabilitiesFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel, dei:LegalEntity
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, dei:LegalEntity
cms:NotesReceivableRelatedPartiesFairValueDisclosure
us-gaap:FairValueByMeasurementBasis, dei:LegalEntity

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

cms:PropertyPlantAndEquipmentNetExcludingCWIP
dei:LegalEntity
cms:PublicUtilitiesPropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
dei:LegalEntity
cms:PublicUtilitiesPropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortizationAndConstructionWorkInProgress
us-gaap:ConsolidationItems, dei:LegalEntity
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments, dei:LegalEntity
dei:LegalEntity
cms:PublicUtilitiesPropertyPlantAndEquipmentNetExcludingCWIP
dei:LegalEntity
cms:PublicUtilitiesPropertyPlantandEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization

dei:EntityCommonStockSharesOutstanding
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:AccountsReceivableFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, dei:LegalEntity
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis, dei:LegalEntity
us-gaap:FairValueByAssetClass
us-gaap:AccountsReceivableGrossCurrent
us-gaap:FairValueByAssetClass, dei:LegalEntity
us-gaap:EnvironmentalRemediationSite
us-gaap:AccrualForEnvironmentalLossContingencies
us-gaap:EnvironmentalRemediationSite, us-gaap:PublicUtility, dei:LegalEntity
us-gaap:Range, us-gaap:EnvironmentalRemediationSite, us-gaap:PublicUtility, dei:LegalEntity
us-gaap:EnvironmentalRemediationSite
us-gaap:AccrualForEnvironmentalLossContingenciesGross
us-gaap:EnvironmentalRemediationSite, us-gaap:PublicUtility, dei:LegalEntity
us-gaap:EnvironmentalRemediationSite
us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueInFifthYear
us-gaap:EnvironmentalRemediationSite, us-gaap:PublicUtility, dei:LegalEntity
us-gaap:EnvironmentalRemediationSite
us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueInFourthYear
us-gaap:EnvironmentalRemediationSite, us-gaap:PublicUtility, dei:LegalEntity
us-gaap:EnvironmentalRemediationSite
us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueInRemainderOfFiscalYear
us-gaap:EnvironmentalRemediationSite, us-gaap:PublicUtility, dei:LegalEntity
us-gaap:EnvironmentalRemediationSite
us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueInSecondYear
us-gaap:EnvironmentalRemediationSite, us-gaap:PublicUtility, dei:LegalEntity
us-gaap:EnvironmentalRemediationSite
us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueInThirdYear
us-gaap:EnvironmentalRemediationSite, us-gaap:PublicUtility, dei:LegalEntity
us-gaap:EnvironmentalRemediationSite
us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueWithinOneYear
us-gaap:EnvironmentalRemediationSite, us-gaap:PublicUtility, dei:LegalEntity

us-gaap:AccumulatedDeferredInvestmentTaxCredit
dei:LegalEntity

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent
dei:LegalEntity

us-gaap:AllowanceForNotesAndLoansReceivableCurrent

us-gaap:AllowanceForNotesAndLoansReceivableNoncurrent

us-gaap:AssetRetirementObligationsNoncurrent
dei:LegalEntity
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:AssetsFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel, dei:LegalEntity
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:CashAndCashEquivalentsFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel, dei:LegalEntity

us-gaap:ConstructionInProgressGross

us-gaap:DebtInstrumentFaceAmount
us-gaap:CreditFacility, us-gaap:DebtInstrument, dei:LegalEntity
us-gaap:DebtInstrumentInterestRateEffectivePercentage
us-gaap:DebtInstrument, dei:LegalEntity

us-gaap:DeferredIncomeTaxLiabilitiesNet
dei:LegalEntity

us-gaap:DerivativeFairValueOfDerivativeAsset
dei:LegalEntity

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

us-gaap:DueFromRelatedPartiesCurrent
dei:LegalEntity
dei:LegalEntity
us-gaap:DueFromRelatedPartiesNoncurrent

us-gaap:DueToRelatedPartiesCurrent
dei:LegalEntity

us-gaap:EnergyRelatedInventoryGasStoredUnderground
dei:LegalEntity

us-gaap:EnergyRelatedInventoryOtherFossilFuel
dei:LegalEntity

us-gaap:EquityMethodInvestments

us-gaap:FinancingReceivableAllowanceForCreditLosses
us-gaap:CumulativeEffectPeriodOfAdoption, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments
us-gaap:FinancingReceivableRecordedInvestmentPastDue
us-gaap:GuaranteeObligationsByNature
us-gaap:GuaranteeObligationsCurrentCarryingValue
us-gaap:LossContingenciesByNatureOfContingency
us-gaap:GuaranteeObligationsByNature
us-gaap:GuaranteeObligationsMaximumExposure
us-gaap:LossContingenciesByNatureOfContingency

us-gaap:HeldToMaturitySecurities

us-gaap:HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain

us-gaap:HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss

us-gaap:HeldToMaturitySecuritiesFairValue
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

us-gaap:InterestAndDividendsPayableCurrent
dei:LegalEntity
us-gaap:ConsolidatedEntities, us-gaap:LineOfCreditFacility
us-gaap:LettersOfCreditOutstandingAmount
us-gaap:LineOfCreditFacility, dei:LegalEntity
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:LiabilitiesFairValueDisclosure
us-gaap:FairValueByFairValueHierarchyLevel, dei:LegalEntity
us-gaap:ConsolidatedEntities, us-gaap:LineOfCreditFacility
us-gaap:LineOfCredit
us-gaap:ConsolidatedEntities, us-gaap:LineOfCreditFacility
us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity
us-gaap:LineOfCreditFacility, dei:LegalEntity
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:StatementBusinessSegments
us-gaap:LoansAndLeasesReceivableDeferredIncome
us-gaap:StatementBusinessSegments

us-gaap:LoansReceivableHeldForSaleAmount

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

us-gaap:NotesAndLoansReceivableNetCurrent
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments
us-gaap:NotesAndLoansReceivableNetNoncurrent
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:NotesPayableFairValueDisclosure
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis
us-gaap:NotesReceivableFairValueDisclosure
us-gaap:FairValueByMeasurementBasis

us-gaap:NotesReceivableNet
dei:LegalEntity
dei:LegalEntity
us-gaap:NotesReceivableRelatedPartiesCurrent
dei:LegalEntity
us-gaap:NotesReceivableRelatedPartiesNoncurrent
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable
us-gaap:OffBalanceSheetCreditLossLiability
us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:StatementBusinessSegments

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

us-gaap:OtherShortTermBorrowings
dei:LegalEntity
us-gaap:PreferredStockParOrStatedValuePerShare
dei:LegalEntity
us-gaap:PreferredStockValue
dei:LegalEntity
us-gaap:PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress

us-gaap:RegulatoryAssetsCurrent
dei:LegalEntity

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

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

us-gaap:RegulatoryLiabilityNoncurrent
dei:LegalEntity

us-gaap:RestrictedCashAndCashEquivalentsAtCarryingValue
dei:LegalEntity
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, dei:LegalEntity
dei:LegalEntity
us-gaap:UnbilledReceivablesCurrent

us-gaap:UnrecoveredCostsForPurchasedGasAmount
dei:LegalEntity

Tables

  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:CommonStockValue ██████████████████████████████████████▁333333333333333333333333333333333333332NANANA
us-gaap:CommonStockSharesOutstanding ██▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▆▆▆▆▆▆▆▅▄▄▄▄▄▄▄▃▂▂▁▁▁286286283283283283283283283282281281281280279279279279277277276276275275275268266266265265264263263257254252251250249NANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding █▁286285NA284284283NA283282282NA281280279NA279279277NA276276275NA274274273NA272272270NA269268266NA263261261NA254247NA
us-gaap:EarningsPerShareBasic ▅█▆▇▄▇▄▆▅█▁▆▄▇▃▆▅▆▄▅▃▇▄▄▄▇▄▅▃▆▃▆▄▃▂▆▄▅▂▆▄▄0.480.860.590.730.330.750.380.60.490.86-0.010.610.330.710.280.670.450.590.390.530.250.730.350.340.310.770.380.480.30.550.260.560.380.260.160.550.40.540.110.580.350.37
us-gaap:EarningsPerShareDiluted ▅█▆▇▄▇▄▆▅█▁▆▄▇▃▆▅▆▄▅▃▇▄▄▃▇▄▅▃▅▃▆▄▃▂▅▄▅▂▅▄▄0.480.850.580.730.330.750.380.590.490.86-0.010.610.330.710.280.670.450.590.380.530.250.730.350.340.30.750.370.460.290.530.250.550.370.250.150.530.380.520.090.530.320.34
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax ▁▄▄▂▁▅▄▂▁▄▄▂▂▄▃▂▁▄▂▂▁▆▄▂▂█▃▂▁▅▃▂▁▃▃▂▁▅▃▂▁▅134317581795144213471957182915191413187317781527144918291640158713711801150914861350211117581430146825231736144514061979167015071333174316201464136420551682144313401967
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax dei:LegalEntity cms:ConsumersEnergyCompany▁▆▅▂▁█▅▃▂▇1326173916351425133119381674149813891849NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems,us-gaap:ProductOrService,us-gaap:StatementBusinessSegments,dei:LegalEntity us-gaap:OperatingSegments,cms:CommercialUtilityService,cms:ElectricUtility,cms:ConsumersEnergyCompany▁▁▃▇▃▂▃█▄341339362427362351364434386NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems,us-gaap:ProductOrService,us-gaap:StatementBusinessSegments,dei:LegalEntity us-gaap:OperatingSegments,cms:ResidentialUtilityServices,cms:ElectricUtility,cms:ConsumersEnergyCompany▄▃▂▇▁▄▂█▃507481457585423523448625475NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems,us-gaap:ProductOrService,us-gaap:StatementBusinessSegments,dei:LegalEntity us-gaap:OperatingSegments,cms:ResidentialUtilityServices,cms:GasUtility,cms:ConsumersEnergyCompany▂▇▅▁▂█▆▁▂206493418111198589435118194NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,cms:ElectricUtility▁▁▁▆▁▃▂█▃▂1020102510341247102611001055131010871076NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,cms:GasUtility▂▇▅▁▂█▆▁▂▇306714601178305838619188302773NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments,dei:LegalEntity us-gaap:OperatingSegments,cms:ElectricUtility,cms:ConsumersEnergyCompany▁▁▁▆▁▃▂█▃102010251034124710261100105513101087NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments,dei:LegalEntity us-gaap:OperatingSegments,cms:GasUtility,cms:ConsumersEnergyCompany▂▇▅▁▂█▆▁▂306714601178305838619188302NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService,dei:LegalEntity cms:CommercialUtilityService,cms:ConsumersEnergyCompany▁▆▅▄▂█▆▅▄392488475454420525481464444NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService,dei:LegalEntity cms:ResidentialUtilityServices,cms:ConsumersEnergyCompany▂▆▅▂▁█▅▃▂7139748756966211112883743669NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:Revenues ▂▄▄▂▂▅▄▃▂▅▄▂▂▄▃▂▁▄▂▂▁▆▄▂▂█▃▂▁▅▃▂▁▃▃▂▁▅▃▂▁▅144318641795154614452059182915991492195317781527144918291640158713711801150914861350211117581430146825231736144514061979167015071333174316201464136420551682144313401967
 us-gaap:Revenues dei:LegalEntity cms:ConsumersEnergyCompany▁▄▃▂▁▅▄▂▂▅▄▂▂▄▃▂▁▄▂▂▁▆▄▂▂█▄▂▁▅▃▂▁▄▃▂▁▆▃▂▁▅133017441670142913341943171215021395185516861437136217371550149812931723143914171281202816721359138723821674138613421919160814481282167515651397130319881620137012761890
 us-gaap:Revenues us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,cms:ElectricUtility▁▁▂▆▁▃▂█▃▂▃▆▂1022102810591250102711031081131310891078108812471077NANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,cms:GasUtility▂▇▆▁▂█▆▁▂▇▅▁▂308716611179307840631189306777598190285NANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments,dei:LegalEntity us-gaap:OperatingSegments,cms:ElectricUtility,cms:ConsumersEnergyCompany▁▁▂▆▁▃▂█▃102210281059125010271103108113131089NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments,dei:LegalEntity us-gaap:OperatingSegments,cms:GasUtility,cms:ConsumersEnergyCompany▂▇▆▁▂█▆▁▂308716611179307840631189306NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold us-gaap:ProductOrService us-gaap:ElectricityPurchased▂▂▁▆▂▃▄█▄▃▃▆362357349413356378391447393382371426NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold us-gaap:ProductOrService us-gaap:OilAndGasPurchased▂▆▅▁▂█▆▁▂█▅▁82273224351064042954811238125647NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:CostsAndExpenses ▁▅▅▁▂█▆▃▂▇1170149614841195122717001579130512371590NA119712081441NA120110861465NA116911461714NANANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingIncomeLoss ▄▇▅▆▃▇▄▅▄▇▇▆▃▇▅▇▅▆▃▅▂█▄▃▃█▄▅▃▆▃▆▄▂▁▅▂▅▁▆▄▃273368311351218359250294255363379330241388290386285336245317204397273236235408264317232329212343260188174316207306158319262239
 us-gaap:OperatingIncomeLoss dei:LegalEntity cms:ConsumersEnergyCompany▃▆▅▆▁▆▃▄▃▆▇▅▃▇▅▇▄▅▃▅▂▇▄▃▃█▄▅▃▆▂▆▄▁▁▅▂▅▂▅▂▃246329308319175328231271229334363308222359288365264317246305192379264245227399258314227319207334260183173305207300191304207224
us-gaap:InterestExpense █▇▆▆▆▃▃▂▁▁141137134133131121121114112111NA111110107NA110108106NA101103101NA101101101NA9910298NA969899NA104104105NA102117105
 us-gaap:InterestExpense dei:LegalEntity cms:ConsumersEnergyCompany█▆▅▄▃▂▃▃▁▂82797775747174737072NA706968NA676667NA656665NA646061NA606261NA596164NA666766NA647868
us-gaap:InterestExpenseDebt █▆▅▅▄▃▄▁▂▁121116112111110106108101103100NA101103100NA103103100NA959796NA989997NA969994NA929494NA9999100NA979898
 us-gaap:InterestExpenseDebt dei:LegalEntity cms:ConsumersEnergyCompany█▆▄▂▂▂▅▂▁▁77747169686973696767NA666666NA656565NA626363NA625959NA586059NA565861NA626363NA606063
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest ▃█▅▇▁▇▂▅▃█164270205249114261126202165281NA229140295NA281183238NA223104302NA141127309NA218NANANANANANANANANANANANANANA
 us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest dei:LegalEntity cms:ConsumersEnergyCompany▄█▇▇▁█▃▅▃█196279254270124280162220179286NA243157312NA298201254NA243128325NA184169337NA255NANANANANANANANANANANANANANA
us-gaap:NonoperatingIncomeExpense ▇█▆▇▆▅▁▅▅▆323928312723-3222229NA10914NA568NA736NA6-72NANA58NANA69NA989NA161416
 us-gaap:NonoperatingIncomeExpense dei:LegalEntity cms:ConsumersEnergyCompany█▇▆▆▆▆▁▅▅▆3229232623235222024NA5421NA934NA3211NA32-1NA127NA-539NA469NA121213
us-gaap:IncomeTaxExpenseBenefit ▃▃▆▇▂█▁▅▃▆27273742204817332540NA574796NA955874NA7536100NA4743105NA915495NA986738NA811077NA875961
 us-gaap:IncomeTaxExpenseBenefit dei:LegalEntity cms:ConsumersEnergyCompany▃▅▆█▁▇▂▄▁▅36444857265431402744NA6253101NA1036982NA8344110NA6560116NA10267103NA1078052NA885490NA925362
us-gaap:ProfitLoss ▅█▆▇▄▇▄▆▅█▁▆▄▇▃▆▅▆▄▅▃▇▄▄▃▇▄▅▃▅▃▅▄▃▂▅▄▅▂▅▃▄13724316820794213109169140241-217293199781861251641071486820297948420410212781144671491016741140101135251468488
 us-gaap:ProfitLoss dei:LegalEntity cms:ConsumersEnergyCompany▅█▇▇▂▇▄▆▄█▄▆▂▇▃▆▄▅▄▅▂▇▃▃▃▇▃▄▂▅▁▅▃▁▁▅▂▄▁▅▂▃1602352062139822613118015224213618110421111719513217213516084215118119109221119153100162781631227667155921537916088107
 us-gaap:ProfitLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▁█136243NA20793213NA169139241NA17292199NA186124164NA14867202NA9483204NANANA144NANA10067NANA100135NANA8288
 us-gaap:ProfitLoss us-gaap:StatementEquityComponents,dei:LegalEntity us-gaap:RetainedEarnings,cms:ConsumersEnergyCompany▄█▇▇▁█▃▅▄16023520621398226131180152NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax █▁0.0-4000000.0NA0.0-2000000.0-1000000.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax us-gaap:StatementEquityComponents us-gaap:AccumulatedGainLossNetCashFlowHedgeParent█▁0.0-4000000.0NA0.0-2000000.0-1000000.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTax 136NA16120792NA104171139NANA17393NANA188124164NA14767203NA9484205NANANANANA15010269NA137102135NANANANA
us-gaap:OtherComprehensiveIncomeLossNetOfTax ▆▄▁▆▅▅▃█▆▆0-3-60-1-1-4200NA111NA2NANANA-1NA1NANA11NA17-21NA222NA-22NANANANANA
 us-gaap:OtherComprehensiveIncomeLossNetOfTax dei:LegalEntity cms:ConsumersEnergyCompany▅▅▁▅▆▅█▆▅▅00-80106200NA01-6NA-223NA1-1-4NANA22NANA-32NA13-2NANA0NANANANANA
us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest 1NA101NA101NANA01NANANA1NANANA1NANANA1NANA11NANA11NANANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest ▃█▄▆▁▇▂▅▃█13724016220793212105171140241NA17394200NA188125164NA14768NANA9485205NA14479145NA15110369NANANANANANANANA
 us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest dei:LegalEntity cms:ConsumersEnergyCompany▄█▆▇▁▇▃▅▄█▃▅▁▆16023519821399226137182152242132181105205NANANA175NANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLoss 136NA16720793213108169139241-317292199771861241641061486720296948320410212680144671481006741139100135251458288
 us-gaap:NetIncomeLoss us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,cms:ElectricUtility119NA9122390NA67199130NA6117694NANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLoss us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,cms:GasUtility41NA114-108NA64-1921NA7259NANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic dei:LegalEntity cms:ConsumersEnergyCompany159NA205213972261301801512421351811032111161951311721341608321511711910822111915299162781621217667154911537915987107
 us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments,dei:LegalEntity us-gaap:OperatingSegments,cms:ElectricUtility,cms:ConsumersEnergyCompany119NA9122390NA67199130NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments,dei:LegalEntity us-gaap:OperatingSegments,cms:GasUtility,cms:ConsumersEnergyCompany41NA114-108NA64-1921NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:NetIncomeLossAttributableToNoncontrollingInterest 1NA1010101010101NA1NA1NA1NA1NA1NANA11NANA11NANA11NANA12NA
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
 Operating Margin dei:LegalEntity cms:ConsumersEnergyCompany▁▆▅▂▁█▅▃▂▇1326173916351425133119381674149813891849NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 EBT Margin dei:LegalEntity cms:ConsumersEnergyCompany▁▆▅▂▁█▅▃▂▇1326173916351425133119381674149813891849NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:Assets █▇▇▇▆▆▆▅▅▅▅▅▄▄▄▄▄▃▄▃▃▃▃▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁285812744726837260092529224793245292391323312228682305022120218672162321622208422046320037203401945219238191981918518381177191792417416169861742917269171311660816293161601645215958159451564215616NANANA
 us-gaap:Assets dei:LegalEntity cms:ConsumersEnergyCompany█▇▇▇▆▆▆▆▅▅▅▅▅▄▄▄▄▃▄▃▃▃▃▂▂▂▂▂▂▂▂▂▁▁▂▁▁▁▁250602420623699229382241622052220252149221283209492109920380202051982419946189801870218422186581797717867178541784716919163871631216179160941640916272162751580415554152671566215058151011495714839NANANA
 us-gaap:Assets us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,cms:ElectricUtility█▆▅▃▃▂▂▁▂159251539714911144951439614237140791385014075NA13906NANANA13429NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Assets us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,cms:GasUtility█▇▇▅▄▃▃▂▁900686788659831278907681780675137187NA7139NANANA6446NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Assets us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments,dei:LegalEntity us-gaap:OperatingSegments,cms:ElectricUtility,cms:ConsumersEnergyCompany█▆▃▁▁1598715459149731455714459NA14143NANANA13907NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Assets us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments,dei:LegalEntity us-gaap:OperatingSegments,cms:GasUtility,cms:ConsumersEnergyCompany█▆▆▄▁90528725870683597937NA7853NANANA7139NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
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  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
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  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
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us-gaap:OtherAssetsNoncurrent ▇▇▇▄▅▅▄▆███▂▂▂▃▂▂▂▃▂▂▃▃▃▃▃▃▁▂▂▂▁▁▂▂▁▁▂▁707723739492519538478629779789799269294321353258285315384288319354352335362392409233259283293217240268276203234252245NANANA
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  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
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  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
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  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
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us-gaap:RetainedEarningsAccumulatedDeficit ███▇▇▇▇▇▆▆▆▆▆▆▅▅▅▅▄▄▄▄▄▄▄▃▃▃▃▃▂▂▂▂▂▂▁▁▁7051-25-83-182-166-271-278-346-383-531-434-512-511-616-607-706-744-855-881-949-936-1058-1080-1099-1110-1242-1276-1334-1346-1423-1426-1511-1548-1553-1542-1628-1675-1757NANANA
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us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▁▁▁▂▂▂▂▃▃▃▄▅▄▄▄▅▅▅▅▄▄▄▄████▆▄▄▄▅▅▅▄▆▆▆▆-76-76-73-67-67-66-65-59-61-61-50-47-48-49-50-45-47-47-47-49-48-48-49-20-20-21-22-39-56-54-55-43-45-47-49-40-38-40-40NANANA
us-gaap:MinorityInterest ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁██████████373737373737373737373737373737373737373737373737373737373744444444444444444444NANANA
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  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities █▂▅▂▇█▁▁595201395210568617138149NA708NA80NA646NANANANANANANANANANANA611NANANA725NANANA635NANANA841NANANA657
 us-gaap:NetCashProvidedByUsedInOperatingActivities dei:LegalEntity cms:ConsumersEnergyCompany▇▂▄▁▆█▂▁543238350141491619194157NA720NA84NA648NANANANANANANANANANANA646NANANA713NANANA681NANANA867NANANA683
us-gaap:NetCashProvidedByUsedInInvestingActivities ▇█▇▁▃▅▁▁-609000000.0-559000000.0-604000000.0-802000000.0-735000000.0-675000000.0-791000000.0-807000000.0NA-456000000.0NA-548000000.0NA-346000000.0NANANANANANANANANANANA-346000000.0NANANA-293000000.0NANANA-313000000.0NANANA-228000000.0NANANA-212000000.0
us-gaap:NetCashProvidedByUsedInFinancingActivities ▆█▁▆▃▂▄▅7571062-67691234150462523NA-229NA200NA-94NANANANANANANANANANANA321NANANA61NANANA-125NANANA-61NANANA221
 us-gaap:NetCashProvidedByUsedInFinancingActivities dei:LegalEntity cms:ConsumersEnergyCompany▅█▁▅▃▁▄▃509904-52488181-109360126NA-195NA113NA-206NANANANANANANANANANANA-171NANANA-68NANANA-281NANANA3NANANA71
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities █▂▅▂▇█▁▁595201395210568617138149NA708NA80NA646NANANANANANANANANANANA611NANANA725NANANA635NANANA841NANANA657
 us-gaap:NetCashProvidedByUsedInOperatingActivities dei:LegalEntity cms:ConsumersEnergyCompany▇▂▄▁▆█▂▁543238350141491619194157NA720NA84NA648NANANANANANANANANANANA646NANANA713NANANA681NANANA867NANANA683
us-gaap:NetIncomeLoss 136NA16720793213108169139241-317292199771861241641061486720296948320410212680144671481006741139100135251458288
 us-gaap:NetIncomeLoss us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,cms:ElectricUtility119NA9122390NA67199130NA6117694NANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLoss us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,cms:GasUtility41NA114-108NA64-1921NA7259NANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ProfitLoss ▅█▆▇▄▇▄▆▅█▁▆▄▇▃▆▅▆▄▅▃▇▄▄▃▇▄▅▃▅▃▅▄▃▂▅▄▅▂▅▃▄13724316820794213109169140241-217293199781861251641071486820297948420410212781144671491016741140101135251468488
 us-gaap:ProfitLoss dei:LegalEntity cms:ConsumersEnergyCompany▅█▇▇▂▇▄▆▄█▄▆▂▇▃▆▄▅▄▅▂▇▃▃▃▇▃▄▂▅▁▅▃▁▁▅▂▄▁▅▂▃1602352062139822613118015224213618110421111719513217213516084215118119109221119153100162781631227667155921537916088107
 us-gaap:ProfitLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings▁█136243NA20793213NA169139241NA17292199NA186124164NA14867202NA9483204NANANA144NANA10067NANA100135NANA8288
 us-gaap:ProfitLoss us-gaap:StatementEquityComponents,dei:LegalEntity us-gaap:RetainedEarnings,cms:ConsumersEnergyCompany▄█▇▇▁█▃▅▄16023520621398226131180152NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:DepreciationDepletionAndAmortization ▂█▅▂▂▇▄▁▁▆223316263215216298244206204279NA193197262NA183176238NA173169222NA153151199NA145137181NA138NA172NANANA162NANANA172
us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet ▂▃▂█▁▄▂▆-443-39147-6712-42100NA2NANANA124NANANA101NANANA68NANANA-48NANANA-47NANANANANANANANANANANANA
us-gaap:IncreaseDecreaseInInventories ▆▂▃▇▇▁▃█72-171-93147111-209-90177NA-228NANANA-201NANANA-274NANANA-378NANANA-345NANANA-447NANANA-312NANANA-462NANANA-460
 us-gaap:IncreaseDecreaseInInventories dei:LegalEntity cms:ConsumersEnergyCompany▆▂▃█▇▁▃█71-170-92148108-204-90173NA-226NANANA-197NANANA-270NANANA-374NANANA-338NANANA-442NANANA-302NANANA-458NANANA-459
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▇█▇▁▃▅▁▁-609000000.0-559000000.0-604000000.0-802000000.0-735000000.0-675000000.0-791000000.0-807000000.0NA-456000000.0NA-548000000.0NA-346000000.0NANANANANANANANANANANA-346000000.0NANANA-293000000.0NANANA-313000000.0NANANA-228000000.0NANANA-212000000.0
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment ▁▄▄▅▃▂▃█423523534597492481502700NA422NANANA365NANANA407NANANA348NANANA304NANANA274NANANA294NANANA191NANANANA
 us-gaap:PaymentsToAcquirePropertyPlantAndEquipment dei:LegalEntity cms:ConsumersEnergyCompany▁▅▅█▄▃▄▃416520526596487476483480NA414NANANA361NANANA406NANANA345NANANA302NANANA273NANANA294NANANA186NANANANA
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▆█▁▆▃▂▄▅7571062-67691234150462523NA-229NA200NA-94NANANANANANANANANANANA321NANANA61NANANA-125NANANA-61NANANA221
 us-gaap:NetCashProvidedByUsedInFinancingActivities dei:LegalEntity cms:ConsumersEnergyCompany▅█▁▅▃▁▄▃509904-52488181-109360126NA-195NA113NA-206NANANANANANANANANANANA-171NANANA-68NANANA-281NANANA3NANANA71
us-gaap:ProceedsFromIssuanceOfLongTermDebt ▆▆▁▃▃▅█▂11551198756214629931723250NA250NANANA923NANANA30NANANA100NANANA550NANANA250NANANA390NANANA0NANANA300
 us-gaap:ProceedsFromIssuanceOfLongTermDebt dei:LegalEntity cms:ConsumersEnergyCompany▄▅▁▄▂▁█▁65587375621297015620NANANANANA349NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:RepaymentsOfLongTermDebt ▃▁▂▁▃▆█▁390211566314790116545NA180NANANA475NANANA30NANANA11NANANA26NANANA10NANANA459NANANA13NANANA34
 us-gaap:RepaymentsOfLongTermDebt dei:LegalEntity cms:ConsumersEnergyCompany▄▁▁▁▄▃█▁▄▁363013031321586303300NANANA250NANANANANANANA11NANANA11NANANA10NANANA310NANANA9NANANA9
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
us-gaap:RepaymentsOfLongTermDebt ▃▁▂▁▃▆█▁390211566314790116545NA180NANANA475NANANA30NANANA11NANANA26NANANA10NANANA459NANANA13NANANA34
 us-gaap:RepaymentsOfLongTermDebt dei:LegalEntity cms:ConsumersEnergyCompany▄▁▁▁▄▃█▁▄▁363013031321586303300NANANA250NANANANANANANA11NANANA11NANANA10NANANA310NANANA9NANANA9

us-gaap:CommonStockValue



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value3333333333333333333333333333333333333322
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockSharesOutstanding



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value286286283283283283283283283282281281281280279279279279277277276276275275275268266266265265264263263257254252251250249227
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding



Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value286285284284283283282282281280279279279277276276275274274273272272270269268266263261261254247
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:EarningsPerShareBasic



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.480.860.590.730.330.750.380.60.490.86-0.010.610.330.710.280.670.450.590.390.530.250.730.350.340.310.770.380.480.30.550.260.560.380.260.160.550.40.540.110.580.350.37
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareDiluted



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.480.850.580.730.330.750.380.590.490.86-0.010.610.330.710.280.670.450.590.380.530.250.730.350.340.30.750.370.460.290.530.250.550.370.250.150.530.380.520.090.530.320.34
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value134317581795144213471957182915191413187317781527144918291640158713711801150914861350211117581430146825231736144514061979167015071333174316201464136420551682144313401967
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues93.194.3100.093.393.295.0100.095.094.795.9100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1326173916351425133119381674149813891849
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax98.798.991.198.898.899.091.598.698.398.7
Percentage of Revenues91.993.391.192.292.194.191.593.793.194.7
Percentage of Revenues cms:ConsumersEnergyCompany99.799.797.999.799.899.797.899.799.699.7

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

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


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value17192217161923212424
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.31.11.21.21.21.01.31.41.71.3
Percentage of Revenues1.21.01.21.11.10.91.31.31.61.2
Percentage of Revenues us-gaap:OperatingSegments cms:OtherUtilityService cms:Enterprises0.00.00.00.00.00.00.00.00.00.0

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

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


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value341339362427362351364434386
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax25.419.320.229.626.917.919.928.627.3
Percentage of Revenues23.618.220.227.625.117.019.927.125.9
Percentage of Revenues us-gaap:OperatingSegments cms:CommercialUtilityService cms:ElectricUtility cms:ConsumersEnergyCompany0.00.00.00.00.00.00.00.00.0
us-gaap:OperatingSegments, cms:CommercialUtilityService, cms:GasUtility, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value5114911327581741173058
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.88.56.31.94.38.96.42.04.1
Percentage of Revenues3.58.06.31.74.08.56.41.93.9
Percentage of Revenues us-gaap:OperatingSegments cms:CommercialUtilityService cms:GasUtility cms:ConsumersEnergyCompany0.00.00.00.00.00.00.00.00.0
us-gaap:OperatingSegments, cms:IndustrialUtilityService, cms:ElectricUtility, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value126140158175174162175186170
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.48.08.812.112.98.39.612.212.0
Percentage of Revenues8.77.58.811.312.07.99.611.611.4
Percentage of Revenues us-gaap:OperatingSegments cms:IndustrialUtilityService cms:ElectricUtility cms:ConsumersEnergyCompany0.00.00.00.00.00.00.00.00.0
us-gaap:OperatingSegments, cms:IndustrialUtilityService, cms:GasUtility, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value7201538251849
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.51.10.80.20.61.31.00.30.6
Percentage of Revenues0.51.10.80.20.61.21.00.30.6
Percentage of Revenues us-gaap:OperatingSegments cms:IndustrialUtilityService cms:GasUtility cms:ConsumersEnergyCompany0.00.00.00.00.00.00.00.00.0
us-gaap:OperatingSegments, cms:OtherUtilityService, cms:ElectricUtility, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value466557606764686556
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.43.73.24.25.03.33.74.34.0
Percentage of Revenues3.23.53.23.94.63.13.74.13.8
Percentage of Revenues us-gaap:OperatingSegments cms:OtherUtilityService cms:ElectricUtility cms:ConsumersEnergyCompany0.00.00.00.00.00.00.00.00.0
us-gaap:OperatingSegments, cms:OtherUtilityService, cms:GasUtility, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value425255374150493641
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.13.03.12.63.02.62.72.42.9
Percentage of Revenues2.92.83.12.42.82.42.72.32.7
Percentage of Revenues us-gaap:OperatingSegments cms:OtherUtilityService cms:GasUtility cms:ConsumersEnergyCompany0.00.00.00.00.00.00.00.00.0
us-gaap:OperatingSegments, cms:ResidentialUtilityServices, cms:ElectricUtility, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value507481457585423523448625475
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax37.827.425.540.631.426.724.541.133.6
Percentage of Revenues35.125.825.537.829.325.424.539.131.8
Percentage of Revenues us-gaap:OperatingSegments cms:ResidentialUtilityServices cms:ElectricUtility cms:ConsumersEnergyCompany0.00.00.00.00.00.00.00.00.0
us-gaap:OperatingSegments, cms:ResidentialUtilityServices, cms:GasUtility, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value206493418111198589435118194
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax15.328.023.37.714.730.123.87.813.7
Percentage of Revenues14.326.423.37.213.728.623.87.413.0
Percentage of Revenues us-gaap:OperatingSegments cms:ResidentialUtilityServices cms:GasUtility cms:ConsumersEnergyCompany0.00.00.00.00.00.00.00.00.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, cms:ElectricUtility


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1020102510341247102611001055131010871076
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax75.958.357.686.576.256.257.786.276.957.4
Percentage of Revenues70.755.057.680.771.053.457.781.972.955.1
Percentage of Revenues us-gaap:OperatingSegments cms:ElectricUtility99.899.70.099.899.999.70.099.899.899.8
us-gaap:OperatingSegments, cms:Enterprises


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value17192217161923212424
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.31.11.21.21.21.01.31.41.71.3
Percentage of Revenues1.21.01.21.11.10.91.31.31.61.2
Percentage of Revenues us-gaap:OperatingSegments cms:Enterprises32.732.80.028.827.628.40.036.839.338.1
us-gaap:OperatingSegments, cms:GasUtility


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value306714601178305838619188302773
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax22.840.633.512.322.642.833.812.421.441.3
Percentage of Revenues21.238.333.511.521.140.733.811.820.239.6
Percentage of Revenues us-gaap:OperatingSegments cms:GasUtility99.499.70.099.499.399.80.099.598.799.5

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

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


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value102010251034124710261100105513101087
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax75.958.357.686.576.256.257.786.276.9
Percentage of Revenues70.755.057.680.771.053.457.781.972.9
Percentage of Revenues us-gaap:OperatingSegments cms:ElectricUtility cms:ConsumersEnergyCompany99.899.70.099.899.999.70.099.899.8
us-gaap:OperatingSegments, cms:GasUtility, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value306714601178305838619188302
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax22.840.633.512.322.642.833.812.421.4
Percentage of Revenues21.238.333.511.521.140.733.811.820.2
Percentage of Revenues us-gaap:OperatingSegments cms:GasUtility cms:ConsumersEnergyCompany99.499.70.099.499.399.80.099.598.7

us-gaap:ProductOrService

cms:OtherUtilityService


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value17192217161923212424
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.31.11.21.21.21.01.31.41.71.3
Percentage of Revenues1.21.01.21.11.10.91.31.31.61.2
Percentage of Revenues cms:OtherUtilityService0.00.00.00.00.00.00.00.00.00.0

us-gaap:ProductOrService, dei:LegalEntity

cms:CommercialUtilityService, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value392488475454420525481464444
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax29.227.826.531.531.226.826.330.531.4
Percentage of Revenues27.226.226.529.429.125.526.329.029.8
Percentage of Revenues cms:CommercialUtilityService cms:ConsumersEnergyCompany0.00.00.00.00.00.00.00.00.0
cms:IndustrialUtilityService, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value133160173178182187193190179
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.99.19.612.313.59.610.612.512.7
Percentage of Revenues9.28.69.611.512.69.110.611.912.0
Percentage of Revenues cms:IndustrialUtilityService cms:ConsumersEnergyCompany0.00.00.00.00.00.00.00.00.0
cms:OtherUtilityService, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value881171129710811411710197
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.66.76.26.78.05.86.46.66.9
Percentage of Revenues6.16.36.26.37.55.56.46.36.5
Percentage of Revenues cms:OtherUtilityService cms:ConsumersEnergyCompany0.00.00.00.00.00.00.00.00.0
cms:ResidentialUtilityServices, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value7139748756966211112883743669
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax53.155.448.748.346.156.848.348.947.3
Percentage of Revenues49.452.348.745.043.054.048.346.544.8
Percentage of Revenues cms:ResidentialUtilityServices cms:ConsumersEnergyCompany0.00.00.00.00.00.00.00.00.0

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:Revenues



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value144318641795154614452059182915991492195317781527144918291640158713711801150914861350211117581430146825231736144514061979167015071333174316201464136420551682144313401967
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value133017441670142913341943171215021395185516861437136217371550149812931723143914171281202816721359138723821674138613421919160814481282167515651397130319881620137012761890
Percentage of Revenues92.293.693.092.492.394.493.693.993.595.094.894.194.095.094.594.494.395.795.495.494.996.195.195.094.594.496.495.995.497.096.396.196.296.196.695.495.596.796.394.995.296.1
Percentage of Revenues92.293.693.092.492.394.493.693.993.595.094.894.194.095.094.594.494.395.795.495.494.996.195.195.094.594.496.495.995.497.096.396.196.296.196.695.495.596.796.394.995.296.1
Percentage of Revenues cms:ConsumersEnergyCompany100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, cms:ElectricUtility


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value1022102810591250102711031081131310891078108812471077
Percentage of Revenues70.855.259.080.971.153.659.182.173.055.261.281.774.3
Percentage of Revenues70.855.259.080.971.153.659.182.173.055.261.281.774.3
Percentage of Revenues us-gaap:OperatingSegments cms:ElectricUtility100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
us-gaap:OperatingSegments, cms:EnerBank


Period End2020-06-302020-03-312019-06-302019-03-31
Value61625349
Percentage of Revenues4.23.33.72.4
Percentage of Revenues4.23.33.72.4
Percentage of Revenues us-gaap:OperatingSegments cms:EnerBank100.0100.0100.0100.0
us-gaap:OperatingSegments, cms:Enterprises


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value52586459586771576163575855
Percentage of Revenues3.63.13.63.84.03.33.93.64.13.23.23.83.8
Percentage of Revenues3.63.13.63.84.03.33.93.64.13.23.23.83.8
Percentage of Revenues us-gaap:OperatingSegments cms:Enterprises100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
us-gaap:OperatingSegments, cms:GasUtility


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-30
Value308716611179307840631189306777598190285
Percentage of Revenues21.338.434.011.621.240.834.511.820.539.833.612.419.7
Percentage of Revenues21.338.434.011.621.240.834.511.820.539.833.612.419.7
Percentage of Revenues us-gaap:OperatingSegments cms:GasUtility100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

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


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value102210281059125010271103108113131089
Percentage of Revenues70.855.259.080.971.153.659.182.173.0
Percentage of Revenues70.855.259.080.971.153.659.182.173.0
Percentage of Revenues us-gaap:OperatingSegments cms:ElectricUtility cms:ConsumersEnergyCompany100.0100.0100.0100.0100.0100.0100.0100.0100.0
us-gaap:OperatingSegments, cms:GasUtility, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value308716611179307840631189306
Percentage of Revenues21.338.434.011.621.240.834.511.820.5
Percentage of Revenues21.338.434.011.621.240.834.511.820.5
Percentage of Revenues us-gaap:OperatingSegments cms:GasUtility cms:ConsumersEnergyCompany100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenues

us-gaap:ProductOrService

us-gaap:CostOfGoodsAndServicesSold

us-gaap:ElectricityPurchased


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value362357349413356378391447393382371426
Percentage of CostOfGoodsAndServicesSold100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues25.119.219.426.724.618.421.428.026.319.620.927.9
Percentage of Revenues us-gaap:ElectricityPurchased0.00.00.00.00.00.00.00.00.00.00.00.0
us-gaap:OilAndGasPurchased


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value82273224351064042954811238125647
Percentage of CostOfGoodsAndServicesSold22.776.564.28.529.8106.975.410.728.599.769.011.0
Percentage of Revenues5.714.612.52.37.319.616.13.07.519.514.43.1
Percentage of Revenues us-gaap:OilAndGasPurchased0.00.00.00.00.00.00.00.00.00.00.00.0

Cost Of Goods And Services Sold

us-gaap:CostsAndExpenses



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-31
Value1170149614841195122717001579130512371590119712081441120110861465116911461714
Percentage of CostsAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues81.180.382.777.384.982.686.381.682.981.478.483.478.875.779.281.378.784.981.2

Costs And Expenses

us-gaap:OperatingIncomeLoss



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value273368311351218359250294255363379330241388290386285336245317204397273236235408264317232329212343260188174316207306158319262239
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues18.919.717.322.715.117.413.718.417.118.621.321.616.621.217.724.320.818.716.221.315.118.815.516.516.016.215.221.916.516.612.722.819.510.810.721.615.214.99.422.119.612.2

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value246329308319175328231271229334363308222359288365264317246305192379264245227399258314227319207334260183173305207300191304207224
Percentage of OperatingIncomeLoss90.189.499.090.980.391.492.492.289.892.095.893.392.192.599.394.692.694.3100.496.294.195.596.7103.896.697.897.799.197.897.097.697.4100.097.399.496.5100.098.0120.995.379.093.7
Percentage of Revenues17.017.717.220.612.115.912.616.915.317.120.420.215.319.617.623.019.317.616.320.514.218.015.017.115.515.814.921.716.116.112.422.219.510.510.720.815.214.611.421.115.411.4
Percentage of Revenues cms:ConsumersEnergyCompany18.518.918.422.313.116.913.518.016.418.021.521.416.320.718.624.420.418.417.121.515.018.715.818.016.416.815.422.716.916.612.923.120.310.911.121.815.915.111.822.216.211.9

Operating Income Loss

us-gaap:InterestExpense



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value1411371341331311211211141121111111101071101081061011031011011011019910298969899104104105102117105
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues9.87.37.58.69.15.96.67.17.55.77.37.65.96.97.95.96.87.64.87.16.94.06.97.35.06.47.45.77.17.65.17.18.75.3

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value82797775747174737072706968676667656665646061606261596164666766647868
Percentage of InterestExpense58.257.757.556.456.558.761.264.062.564.963.162.763.660.961.163.264.464.164.463.459.460.460.660.862.261.562.264.663.564.462.962.766.764.8
Percentage of Revenues5.74.24.34.95.13.44.04.64.73.74.64.83.74.24.83.74.44.93.14.54.12.44.24.43.13.94.63.74.54.93.24.45.83.5
Percentage of Revenues cms:ConsumersEnergyCompany6.24.54.65.25.53.74.34.95.03.94.95.13.94.55.13.94.65.23.24.74.32.64.34.63.24.14.83.84.75.13.34.76.13.6

Interest Expense

us-gaap:InterestExpenseDebt



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value1211161121111101061081011031001011031001031031009597969899979699949294949999100979898
Percentage of InterestExpenseDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues8.46.26.27.27.65.15.96.36.95.16.67.15.56.57.55.66.47.24.56.96.73.86.67.04.76.17.15.46.87.34.96.77.35.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value77747169686973696767666666656565626363625959586059565861626363606063
Percentage of InterestExpenseDebt63.663.863.462.261.865.167.668.365.067.065.364.166.063.163.165.065.364.965.663.359.660.860.460.662.860.961.764.962.663.663.061.961.264.3
Percentage of Revenues5.34.04.04.54.73.44.04.34.53.44.34.63.64.14.73.64.24.73.04.34.02.34.04.33.03.74.43.54.24.63.14.24.53.2
Percentage of Revenues cms:ConsumersEnergyCompany5.84.24.34.85.13.64.34.64.83.64.64.83.84.35.03.84.44.93.14.64.32.54.24.53.13.94.53.64.44.83.24.44.73.3

Interest Expense Debt

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-30
Value164270205249114261126202165281229140295281183238223104302141127309218
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues11.414.511.416.17.912.76.912.611.114.415.09.716.117.713.313.215.07.714.39.98.712.215.1

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-30
Value196279254270124280162220179286243157312298201254243128325184169337255
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest119.5103.3123.9108.4108.8107.3128.6108.9108.5101.8106.1112.1105.8106.0109.8106.7109.0123.1107.6130.5133.1109.1117.0
Percentage of Revenues13.615.014.217.58.613.68.913.812.014.615.910.817.118.814.714.116.49.515.412.911.513.417.6
Percentage of Revenues cms:ConsumersEnergyCompany14.716.015.218.99.314.49.514.612.815.416.911.518.019.915.514.717.110.016.013.512.214.118.4

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

us-gaap:NonoperatingIncomeExpense



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-06-302013-03-312012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value323928312723-3222229109145687366-725869989161416
Percentage of NonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues2.22.11.62.01.91.1-0.21.41.51.50.70.60.80.30.40.40.50.20.30.4-0.50.10.40.40.50.50.60.60.41.11.00.8

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value32292326232352220245421934321132-1127-539469121213
Percentage of NonoperatingIncomeExpense100.074.482.183.985.2100.0-166.7100.090.982.850.044.4150.0180.050.050.042.966.7183.350.0-28.6-50.00.040.087.50.050.0100.044.475.0100.075.085.781.2
Percentage of Revenues2.21.61.31.71.61.10.31.41.31.20.30.31.10.60.20.20.20.10.50.20.1-0.00.10.10.4-0.30.20.50.30.40.40.80.90.7
Percentage of Revenues cms:ConsumersEnergyCompany2.41.71.41.81.71.20.31.51.41.30.30.31.20.60.20.20.20.20.50.20.1-0.00.10.10.4-0.30.20.50.30.50.50.90.90.7

Nonoperating Income Expense

us-gaap:IncomeTaxExpenseBenefit



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value2727374220481733254057479695587475361004743105915495986738811077875961
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues1.91.42.12.71.42.30.92.11.72.03.73.25.26.04.24.15.02.74.73.32.94.26.33.84.86.55.02.25.50.73.76.04.43.1

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value364448572654314027446253101103698283441106560116102671031078052885490925362
Percentage of IncomeTaxExpenseBenefit133.3163.0129.7135.7130.0112.5182.4121.2108.0110.0108.8112.8105.2108.4119.0110.8110.7122.2110.0138.3139.5110.5112.1124.1108.4109.2119.4136.8108.6540.0116.9105.789.8101.6
Percentage of Revenues2.52.42.73.71.82.61.72.51.82.34.13.75.56.55.04.65.63.35.24.54.14.67.14.85.27.16.03.06.04.04.46.44.03.2
Percentage of Revenues cms:ConsumersEnergyCompany2.72.52.94.01.92.81.82.71.92.44.33.95.86.95.34.85.93.45.44.84.34.97.45.05.47.46.23.16.34.14.56.74.23.3

Income Tax Expense Benefit

us-gaap:ProfitLoss



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value13724316820794213109169140241-217293199781861251641071486820297948420410212781144671491016741140101135251468488
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues9.513.09.413.46.510.36.010.69.412.3-0.111.36.410.94.811.79.19.17.110.05.09.65.56.65.78.15.98.85.87.34.09.97.63.82.59.67.46.61.510.16.34.5

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1602352062139822613118015224213618110421111719513217213516084215118119109221119153100162781631227667155921537916088107
Percentage of ProfitLoss116.896.7122.6102.9104.3106.1120.2106.5108.6100.4-6800.0105.2111.8106.0150.0104.8105.6104.9126.2108.1123.5106.4121.6126.6129.8108.3116.7120.5123.5112.5116.4109.4120.8113.4163.4110.791.1113.3316.0109.6104.8121.6
Percentage of Revenues11.112.611.513.86.811.07.211.310.212.47.611.97.211.57.112.39.69.68.910.86.210.26.78.37.48.86.910.67.18.24.710.89.24.44.110.66.77.44.711.16.65.4
Percentage of Revenues cms:ConsumersEnergyCompany12.013.512.314.97.311.67.712.010.913.08.112.67.612.17.513.010.210.09.411.36.610.67.18.87.99.37.111.07.58.44.911.39.54.54.311.17.17.74.911.76.95.7

us-gaap:ConsolidationItems

cms:CorporateAndReconcilingItems


Period End2020-03-312019-03-312018-03-31
Value-26-14-16
Percentage of ProfitLoss-10.7-6.6-6.6
Percentage of Revenues-1.4-0.7-0.8
Percentage of Revenues cms:CorporateAndReconcilingItems0.0-28.6-45.7

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, cms:ElectricUtility


Period End2020-03-312019-03-312018-03-31
Value118105139
Percentage of ProfitLoss48.649.357.7
Percentage of Revenues6.35.17.1
Percentage of Revenues us-gaap:OperatingSegments cms:ElectricUtility11.59.512.9
us-gaap:OperatingSegments, cms:EnerBank


Period End2020-03-312019-03-31
Value1411
Percentage of ProfitLoss5.85.2
Percentage of Revenues0.80.5
Percentage of Revenues us-gaap:OperatingSegments cms:EnerBank22.622.4
us-gaap:OperatingSegments, cms:Enterprises


Period End2020-03-312019-03-312018-03-31
Value20115
Percentage of ProfitLoss8.20.56.2
Percentage of Revenues1.10.00.8
Percentage of Revenues us-gaap:OperatingSegments cms:Enterprises34.51.523.8
us-gaap:OperatingSegments, cms:GasUtility


Period End2020-03-312019-03-312018-03-31
Value117121103
Percentage of ProfitLoss48.156.842.7
Percentage of Revenues6.35.95.3
Percentage of Revenues us-gaap:OperatingSegments cms:GasUtility16.314.413.3

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

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


Period End2020-03-312019-03-31
Value118105
Percentage of ProfitLoss48.649.3
Percentage of Revenues6.35.1
Percentage of Revenues us-gaap:OperatingSegments cms:ElectricUtility cms:ConsumersEnergyCompany11.59.5
us-gaap:OperatingSegments, cms:GasUtility, cms:ConsumersEnergyCompany


Period End2020-03-312019-03-31
Value117121
Percentage of ProfitLoss48.156.8
Percentage of Revenues6.35.9
Percentage of Revenues us-gaap:OperatingSegments cms:GasUtility cms:ConsumersEnergyCompany16.314.4

us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest


Period End2020-06-302019-09-302019-06-302018-09-302018-06-302017-09-302017-06-30
Value1010101
Percentage of ProfitLoss0.70.01.10.00.70.01.1
Percentage of Revenues0.10.00.10.00.10.00.1
Percentage of Revenues us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.0
us-gaap:RetainedEarnings


Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-06-302011-03-312010-06-302010-03-31
Value1362432079321316913924117292199186124164148672029483204144100671001358288
Percentage of ProfitLoss99.3100.0100.098.9100.0100.099.3100.0100.098.9100.0100.099.2100.0100.098.5100.0100.098.8100.0100.099.0100.099.0100.097.6100.0
Percentage of Revenues9.413.013.46.410.310.69.312.311.36.310.911.79.09.110.05.09.66.65.78.17.37.53.87.36.66.14.5
Percentage of Revenues us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents, dei:LegalEntity

us-gaap:RetainedEarnings, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value16023520621398226131180152
Percentage of ProfitLoss116.896.7122.6102.9104.3106.1120.2106.5108.6
Percentage of Revenues11.112.611.513.86.811.07.211.310.2
Percentage of Revenues us-gaap:RetainedEarnings cms:ConsumersEnergyCompany0.00.00.00.00.00.00.00.00.0

Profit Loss

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax



Period End2020-06-302020-03-312019-09-302019-06-302019-03-31
Value0.0-4000000.00.0-2000000.0-1000000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax100.0100.0100.0100.0100.0
Percentage of Revenues0.0-0.20.0-0.1-0.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Period End2020-06-302020-03-312019-09-302019-06-302019-03-31
Value0.0-4000000.00.0-2000000.0-1000000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax100.0100.0100.0100.0100.0
Percentage of Revenues0.0-0.20.0-0.1-0.0
Percentage of Revenues us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.0

Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax

us-gaap:ComprehensiveIncomeNetOfTax



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-09-302017-06-302016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-31
Value136161207921041711391739318812416414767203948420515010269137102135
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues9.49.013.46.45.710.79.311.36.411.89.09.19.95.09.66.65.78.110.07.74.09.47.56.6

Comprehensive Income Net Of Tax

us-gaap:OtherComprehensiveIncomeLossNetOfTax



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302015-09-302015-03-312014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-30
Value0-3-60-1-1-42001112-111117-21222-22
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.0-0.2-0.30.0-0.1-0.0-0.20.10.00.00.10.10.10.1-0.10.00.10.01.2-0.10.10.10.20.1-0.10.1

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-06-302014-03-312013-06-302013-03-312012-09-302012-06-302012-03-312011-06-30
Value00-8010620001-6-2231-1-422-3213-20
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0-0.0133.3100.0-100.0-0.0-150.0100.0100.0100.00.0100.0-600.0-100.00.00.0-100.00.0-400.0200.0200.0150.0200.050.0150.0-100.00.0
Percentage of Revenues0.00.0-0.40.00.10.00.30.10.00.00.00.1-0.3-0.10.10.20.1-0.1-0.20.10.1-0.20.10.10.2-0.10.0
Percentage of Revenues cms:ConsumersEnergyCompany0.00.0-0.50.00.10.00.40.10.00.00.00.1-0.3-0.10.20.20.1-0.1-0.20.10.1-0.20.10.10.2-0.10.0

Other Comprehensive Income Loss Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-09-302017-06-302016-06-302015-06-302014-06-302013-09-302013-06-302012-09-302012-06-30
Value1101101011111111
Percentage of ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.10.10.00.10.10.00.10.00.10.10.10.10.10.10.10.1

Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value13724016220793212105171140241173942001881251641476894852051447914515110369
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues9.512.99.013.46.410.35.710.79.412.311.36.510.911.89.19.19.95.06.65.88.110.05.67.310.07.74.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-03-31
Value16023519821399226137182152242132181105205175
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest116.897.9122.2102.9106.5106.6130.5106.4108.6100.40.0104.6111.7102.5106.7
Percentage of Revenues11.112.611.013.86.911.07.511.410.212.47.411.97.211.29.7
Percentage of Revenues cms:ConsumersEnergyCompany12.013.511.914.97.411.68.012.110.913.07.812.67.711.810.2

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

us-gaap:NetIncomeLoss



Period End2020-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value13616720793213108169139241-317292199771861241641061486720296948320410212680144671481006741139100135251458288
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues9.49.313.46.410.35.910.69.312.3-0.211.36.310.94.711.79.09.17.010.05.09.65.56.65.78.15.98.75.77.34.09.87.53.82.59.57.36.61.510.06.14.5

us-gaap:ConsolidationItems

cms:CorporateAndReconcilingItems


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-30
Value-33-102-13-15-24-15-26-82-17-18
Percentage of NetIncomeLoss-24.3-61.1-6.3-16.1-22.2-8.9-18.72733.3-9.9-19.6
Percentage of Revenues-2.3-5.7-0.8-1.0-1.3-0.9-1.7-4.6-1.1-1.2
Percentage of Revenues cms:CorporateAndReconcilingItems0.00.0-22.4-28.3-52.2-37.5-72.2-234.3-53.1-56.2

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, cms:ElectricUtility


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-30
Value1199122390671991306117694
Percentage of NetIncomeLoss87.554.5107.796.862.0117.893.5-2033.3102.3102.2
Percentage of Revenues8.25.114.46.23.712.48.73.411.56.5
Percentage of Revenues us-gaap:OperatingSegments cms:ElectricUtility11.68.617.88.86.215.211.95.614.18.7
us-gaap:OperatingSegments, cms:EnerBank


Period End2020-06-302019-06-30
Value810
Percentage of NetIncomeLoss5.910.8
Percentage of Revenues0.60.7
Percentage of Revenues us-gaap:OperatingSegments cms:EnerBank13.118.9
us-gaap:OperatingSegments, cms:Enterprises


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-30
Value1157101414-5487
Percentage of NetIncomeLoss0.79.03.410.80.92.410.11800.04.77.6
Percentage of Revenues0.10.80.50.70.10.30.9-3.00.50.5
Percentage of Revenues us-gaap:OperatingSegments cms:Enterprises1.923.411.917.21.47.023.0-94.713.812.7
us-gaap:OperatingSegments, cms:GasUtility


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-30
Value41114-10864-19217259
Percentage of NetIncomeLoss30.168.3-4.88.659.3-11.215.1-2400.02.99.8
Percentage of Revenues2.86.4-0.60.63.5-1.21.44.00.30.6
Percentage of Revenues us-gaap:OperatingSegments cms:GasUtility13.318.7-5.62.610.1-10.16.912.02.63.2

Net Income Loss

dei:LegalEntity

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

cms:ConsumersEnergyCompany


Period End2020-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value159205213972261301801512421351811032111161951311721341608321511711910822111915299162781621217667154911537915987107
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues11.011.413.86.711.07.111.310.112.47.611.97.111.57.112.39.69.68.910.86.110.26.78.37.48.86.910.57.08.24.710.79.14.44.110.56.77.44.711.06.55.4
Percentage of Revenues cms:ConsumersEnergyCompany12.012.314.97.311.67.612.010.813.08.012.67.612.17.513.010.110.09.311.36.510.67.08.87.89.37.111.07.48.44.911.29.44.54.311.07.07.74.911.66.85.7

us-gaap:ConsolidationItems, dei:LegalEntity

cms:CorporateAndReconcilingItems, cms:ConsumersEnergyCompany


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-30
Value-100-1-100
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic-0.60.00.0-1.0-0.80.00.0
Percentage of Revenues-0.10.00.0-0.1-0.10.00.0
Percentage of Revenues cms:CorporateAndReconcilingItems cms:ConsumersEnergyCompany0.00.00.00.00.00.00.0

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

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


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-30
Value119912239067199130
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic74.844.4104.792.851.5110.686.1
Percentage of Revenues8.25.114.46.23.712.48.7
Percentage of Revenues us-gaap:OperatingSegments cms:ElectricUtility cms:ConsumersEnergyCompany11.68.617.88.86.215.211.9
us-gaap:OperatingSegments, cms:GasUtility, cms:ConsumersEnergyCompany


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-30
Value41114-10864-1921
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic25.855.6-4.78.249.2-10.613.9
Percentage of Revenues2.86.4-0.60.63.5-1.21.4
Percentage of Revenues us-gaap:OperatingSegments cms:GasUtility cms:ConsumersEnergyCompany13.318.7-5.62.610.1-10.16.9

Net Income Loss Available To Common Stockholders Basic

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest



Period End2020-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-06-302015-12-312015-06-302014-12-312014-06-302013-09-302013-06-302012-09-302012-06-302011-09-302011-06-302010-09-302010-06-30
Value110101010101011111111111112
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.10.10.00.10.00.10.00.10.00.10.00.10.00.10.10.10.10.10.10.10.10.10.10.10.10.10.1

Net Income Loss Attributable To Noncontrolling Interest

us-gaap:Assets



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value28581274472683726009252922479324529239132331222868230502212021867216232162220842204632003720340194521923819198191851838117719179241741616986174291726917131166081629316160164521595815945156421561615256
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value25060242062369922938224162205222025214922128320949210992038020205198241994618980187021842218658179771786717854178471691916387163121617916094164091627216275158041555415267156621505815101149571483914622
Percentage of Assets87.788.288.388.288.688.989.889.991.391.691.592.192.491.792.291.191.491.991.792.492.993.093.092.092.591.092.994.794.194.295.095.295.594.595.294.494.795.695.095.8
Percentage of Assets87.788.288.388.288.688.989.889.991.391.691.592.192.491.792.291.191.491.991.792.492.993.093.092.092.591.092.994.794.194.295.095.295.594.595.294.494.795.695.095.8
Percentage of Assets cms:ConsumersEnergyCompany100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

cms:CorporateAndReconcilingItems


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value3091794827022484235121042012172916631478
Percentage of Assets1.10.70.210.49.89.58.68.47.47.26.8
Percentage of Assets1.10.70.210.49.89.58.68.47.47.26.8
Percentage of Assets cms:CorporateAndReconcilingItems100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, dei:LegalEntity

cms:CorporateAndReconcilingItems, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312017-12-31
Value21222022202953
Percentage of Assets0.10.10.10.10.10.10.2
Percentage of Assets0.10.10.10.10.10.10.2
Percentage of Assets cms:CorporateAndReconcilingItems cms:ConsumersEnergyCompany100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, cms:ElectricUtility


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value1592515397149111449514396142371407913850140751390613429
Percentage of Assets55.756.155.655.756.957.457.457.960.460.362.1
Percentage of Assets55.756.155.655.756.957.457.457.960.460.362.1
Percentage of Assets us-gaap:OperatingSegments cms:ElectricUtility100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
us-gaap:OperatingSegments, cms:EnerBank


Period End2020-06-302020-03-312019-12-312018-12-312017-12-31
Value27992640269220061453
Percentage of Assets9.89.610.08.26.3
Percentage of Assets9.89.610.08.26.3
Percentage of Assets us-gaap:OperatingSegments cms:EnerBank100.0100.0100.0100.0100.0
us-gaap:OperatingSegments, cms:Enterprises


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value542553527500522524540538321342269
Percentage of Assets1.92.02.01.92.12.12.22.21.41.51.2
Percentage of Assets1.92.02.01.92.12.12.22.21.41.51.2
Percentage of Assets us-gaap:OperatingSegments cms:Enterprises100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
us-gaap:OperatingSegments, cms:GasUtility


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value90068678865983127890768178067513718771396446
Percentage of Assets31.531.632.332.031.231.031.831.430.831.029.8
Percentage of Assets31.531.632.332.031.231.031.831.430.831.029.8
Percentage of Assets us-gaap:OperatingSegments cms:GasUtility100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

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


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312017-12-31
Value15987154591497314557144591414313907
Percentage of Assets55.956.355.856.057.257.760.3
Percentage of Assets55.956.355.856.057.257.760.3
Percentage of Assets us-gaap:OperatingSegments cms:ElectricUtility cms:ConsumersEnergyCompany100.0100.0100.0100.0100.0100.0100.0
us-gaap:OperatingSegments, cms:GasUtility, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312017-12-31
Value9052872587068359793778537139
Percentage of Assets31.731.832.432.131.432.031.0
Percentage of Assets31.731.832.432.131.432.031.0
Percentage of Assets us-gaap:OperatingSegments cms:GasUtility cms:ConsumersEnergyCompany100.0100.0100.0100.0100.0100.0100.0

Assets

us-gaap:LiabilitiesAndStockholdersEquity



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value28581274472683726009252922479324529239132331222868230502212021867216232162220842204632003720340194521923819198191851838117719179241741616986174291726917131166081629316160164521595815945156421561615256
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value250602420623699229382241622052220252149221283209492109920380202051982419946189801870218422186581797717867178541784716919163871631216179160941640916272162751580415554152671566215058151011495714839
Percentage of LiabilitiesAndStockholdersEquity87.788.288.388.288.688.989.889.991.391.691.592.192.491.792.291.191.491.991.792.492.993.093.092.092.591.092.994.794.194.295.095.295.594.595.294.494.795.695.0
Percentage of Assets87.788.288.388.288.688.989.889.991.391.691.592.192.491.792.291.191.491.991.792.492.993.093.092.092.591.092.994.794.194.295.095.295.594.595.294.494.795.695.0
Percentage of Assets cms:ConsumersEnergyCompany100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities And Stockholders Equity

us-gaap:StockholdersEquity



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value5214518550184957485148584755474946724596444145354449437042534259415641093938390238183802367036703645361834543396332333063194319631113049302830432958288727932602
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets18.218.918.719.119.219.619.419.920.020.119.320.520.320.219.720.420.320.519.420.119.819.819.120.020.620.219.820.019.119.118.619.219.118.918.419.118.618.517.917.1

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value846880667700769976107287688368866851667664516495642562095902592458795679550954855429547952405214521350584820480047544759453845594540445943504367430943104136
Percentage of StockholdersEquity162.4155.6153.4155.3156.9150.0144.8145.0146.6145.3145.3143.2144.4142.1138.8139.1141.5138.2139.9140.6142.2144.1142.8142.1143.0139.8139.5141.3143.1144.0142.1142.6145.9146.2143.7143.5145.7149.3148.1
Percentage of Assets29.629.428.729.630.129.428.128.829.429.228.029.429.428.727.328.428.728.327.128.228.228.527.328.429.428.227.728.327.327.626.527.527.927.626.427.427.027.626.5
Percentage of Assets cms:ConsumersEnergyCompany33.833.332.533.633.933.031.332.032.231.930.631.931.831.329.631.231.430.829.530.530.430.729.430.831.831.029.829.829.029.227.928.829.229.227.829.028.528.827.9

Stockholders Equity

us-gaap:AssetsCurrent



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value3532281723312305225423762468237422862207247521212211221522802198203118902320212322912501259727342465296925262401248525282422236022062268256528602956274127592742
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets12.410.38.78.98.99.610.19.99.89.710.79.610.110.210.510.59.99.411.410.911.913.013.514.913.916.614.514.114.314.614.114.213.514.015.617.918.517.517.718.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value277022031872186517591794198017451825176619751790191217461942164715641549192918262038220822732256204922362157224421532216225522272110201624072563267926002519
Percentage of AssetsCurrent78.478.280.380.978.075.580.273.579.880.079.884.486.578.885.274.977.082.083.186.089.088.387.582.583.175.385.493.586.687.793.194.495.688.993.889.690.694.991.3
Percentage of Assets9.78.07.07.27.07.28.17.37.87.78.68.18.78.19.07.97.67.79.59.410.611.511.812.311.612.512.413.212.412.813.213.413.012.514.616.116.816.616.1
Percentage of Assets cms:ConsumersEnergyCompany11.19.17.98.17.88.19.08.18.68.49.48.89.58.89.78.78.48.410.310.211.412.412.713.312.513.713.313.913.113.613.914.113.613.215.417.017.717.417.0

Assets Current

us-gaap:CashAndCashEquivalentsAtCarryingValue



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value15878341404033122341533234771951821424184332353393851772661504775222074933587581722605375869312818735816162399480124769653675590207344
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.63.00.51.51.20.90.61.42.00.90.80.61.92.01.11.61.90.91.30.82.52.71.12.72.04.21.01.53.13.40.50.81.12.21.03.96.25.11.60.00.00.00.60.00.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value1215604112591963739925411544553431821312111727504339742571200981781819928635555715417385373766713712333205913969
Percentage of CashAndCashEquivalentsAtCarryingValue76.672.47.964.362.815.825.52.853.259.024.238.782.142.055.76.230.415.318.828.783.281.434.340.627.423.510.576.553.360.65.444.582.448.352.859.977.189.028.733.559.778.343.333.3
Percentage of Assets4.32.20.01.00.80.10.20.01.10.50.20.21.60.80.60.10.60.10.20.22.12.20.41.10.61.00.11.21.62.10.00.30.91.10.52.34.84.60.50.00.00.00.30.0
Percentage of Assets cms:ConsumersEnergyCompany4.82.50.01.10.90.20.20.01.20.50.20.31.70.90.70.10.60.10.30.22.22.40.41.20.61.10.11.21.72.20.00.41.01.10.52.55.14.80.50.00.00.00.30.0

Cash And Cash Equivalents At Carrying Value

us-gaap:AccountsReceivableNetCurrent



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value737884886641749997964710708100210326316667758216346037307746406699088816837541032914678728914855667670750869690719930981948
Percentage of AccountsReceivableNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.63.23.32.53.04.03.93.03.04.44.52.93.03.63.83.02.93.63.83.33.54.74.63.74.35.85.24.04.25.35.04.04.14.65.34.34.55.96.36.2

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value6537858276116538948556866908588856126487558006165857137586276558888636697391013902669719901844659659737860683706915963
Percentage of AccountsReceivableNetCurrent88.688.893.395.387.289.788.796.697.585.685.897.097.397.497.497.297.097.797.998.097.997.898.098.098.098.298.798.798.898.698.798.898.498.399.099.098.298.498.2
Percentage of Assets2.32.93.12.32.63.63.52.93.03.83.82.83.03.53.73.02.93.63.73.23.44.64.53.64.25.75.23.94.15.24.94.04.04.65.24.34.45.86.2
Percentage of Assets cms:ConsumersEnergyCompany2.63.23.52.72.94.13.93.23.24.14.23.03.23.84.03.23.13.94.13.53.75.04.84.04.56.25.64.24.45.55.24.24.24.85.54.54.76.16.5

Accounts Receivable Net Current

us-gaap:OtherAssetsCurrent



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1621018686839710110393101831181171208194102917787898472791081198668795653627050504937393731
Percentage of OtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.60.40.30.30.30.40.40.40.40.40.40.50.50.60.40.50.50.50.40.40.50.40.40.40.60.70.50.40.50.30.30.40.40.30.30.30.20.20.20.2

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value143857374718683908289711101101147085978466798378637310111177607250455663424343303027
Percentage of OtherAssetsCurrent88.384.284.986.085.588.782.287.488.288.185.593.294.095.086.490.495.192.385.790.893.392.987.592.493.593.389.588.291.189.384.990.390.084.086.087.881.176.973.0
Percentage of Assets0.50.30.30.30.30.30.30.40.40.40.30.50.50.50.30.40.50.40.30.40.40.40.30.40.60.60.40.40.40.30.30.30.40.30.30.30.20.20.2
Percentage of Assets cms:ConsumersEnergyCompany0.60.40.30.30.30.40.40.40.40.40.30.50.50.60.40.40.50.50.40.40.50.40.40.40.60.70.50.40.40.30.30.40.40.30.30.30.20.20.2

Other Assets Current

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value7697756373607264713072367037690968086682651064036311620660565953592258785747569756335545541553215242516850875355527852005121504749735008490148694802473146464540
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets26.927.627.427.928.229.228.728.929.229.228.228.928.928.728.028.628.929.328.329.329.328.928.228.929.628.829.231.530.330.129.930.430.531.029.830.530.130.229.829.8

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:PropertyPlantAndEquipmentNet



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value194361914418926185241810618315181261779017237169041676116444161191585715715154431518714907147051416013775135261341212246
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets68.069.770.571.271.673.973.974.473.973.972.774.373.773.372.774.174.274.472.372.871.670.569.970.3

Property Plant And Equipment Net

us-gaap:OtherAssetsNoncurrent



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value707723739492519538478629779789799269294321353258285315384288319354352335362392409233259283293217240268276203234252245226
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.52.62.81.92.12.21.92.63.33.53.51.21.31.51.61.21.41.61.91.51.71.81.81.82.02.22.31.41.51.61.71.31.51.71.71.31.51.61.61.5

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value599619637407434458410545660674687160189218250151179209262165194230236208233263283149172198209134157179196123150174176
Percentage of OtherAssetsNoncurrent84.785.686.282.783.685.185.886.684.785.486.059.564.367.970.858.562.866.368.257.360.865.067.062.164.467.169.263.966.470.071.361.865.466.871.060.664.169.071.8
Percentage of Assets2.12.32.41.61.71.81.72.32.82.93.00.70.91.01.20.70.91.01.30.81.01.21.21.11.31.51.60.91.01.11.20.81.01.11.20.80.91.11.1
Percentage of Assets cms:ConsumersEnergyCompany2.42.62.71.81.92.11.92.53.13.23.30.80.91.11.30.81.01.11.40.91.11.31.31.21.41.61.70.91.01.21.30.81.01.21.30.81.01.21.2

Other Assets Noncurrent

us-gaap:LiabilitiesCurrent



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value3123294027042165238621062624344225352482278422612115192626552069209120472302178816401599201416481563180119451464180216451797148518071819233822142241229020211954
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.910.710.18.39.48.510.714.410.910.912.110.29.78.912.39.910.210.211.39.28.58.310.59.08.810.011.28.610.39.510.58.911.111.314.213.914.114.612.912.8

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value182016711712115612571298161823071635205621361679158314002094130315711511173113151146108013861161128813431480111711881286141011301274109016421383136312871161
Percentage of LiabilitiesCurrent58.356.863.353.452.761.661.767.064.582.876.774.374.872.778.963.075.173.875.273.569.967.568.870.482.474.676.176.365.978.278.576.170.559.970.262.560.856.257.4
Percentage of Assets6.46.16.44.45.05.26.69.67.09.09.37.67.26.59.76.37.77.58.56.86.05.67.26.37.37.58.56.66.87.48.26.87.86.710.08.78.58.27.4
Percentage of Assets cms:ConsumersEnergyCompany7.36.97.25.05.65.97.310.77.79.810.18.27.87.110.56.98.48.29.37.36.46.07.86.97.98.29.16.97.27.98.77.28.27.110.59.29.08.67.8

Liabilities Current

us-gaap:NotesPayableCurrent



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302016-12-312016-09-302015-12-312015-09-302014-12-312013-12-312012-12-31
Value00900030972790170230398752496860170110
Percentage of NotesPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.30.00.00.10.41.20.00.71.01.80.41.20.30.31.00.6

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302016-12-312016-09-302015-12-312015-09-302014-12-312013-12-312012-12-31
Value00900030972790170230398752496860170110
Percentage of NotesPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.30.00.00.10.41.20.00.71.01.80.41.20.30.31.00.6
Percentage of Assets cms:ConsumersEnergyCompany0.00.00.40.00.00.10.41.30.00.81.12.00.41.30.40.31.10.7

Notes Payable Current

us-gaap:LongTermDebtCurrent



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value170017001111110011008219741900120013001081959819790864984897929684720498521519669418645541511737711519488631814103311161099726
Percentage of LongTermDebtCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.96.24.14.24.33.34.07.95.15.74.74.33.73.74.04.74.44.63.43.72.62.72.73.62.43.63.13.04.24.13.02.93.95.06.37.06.94.6

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value5375022021022626268763766933434433733053752754484481982611001131246045444342422414140403933933833837
Percentage of LongTermDebtCurrent31.629.518.29.32.43.22.746.131.353.331.746.245.538.643.427.949.948.228.936.220.121.723.99.010.86.87.98.25.733.97.98.26.34.832.830.330.85.1
Percentage of Assets1.91.80.80.40.10.10.13.71.63.01.52.01.71.41.71.32.22.21.01.30.50.60.60.30.30.20.20.20.21.40.20.20.20.22.12.12.10.2
Percentage of Assets cms:ConsumersEnergyCompany2.12.10.90.40.10.10.14.11.83.31.62.21.81.51.91.42.42.41.11.50.60.60.70.40.30.30.30.30.31.50.30.30.30.32.22.22.20.2

Long Term Debt Current

us-gaap:AccountsPayableCurrent



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value629490622598627544723680623534725624599479598539559534633586558512678604587632585519512426512491527409575484444413492509
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.21.82.32.32.52.22.92.82.72.33.12.82.72.22.82.62.72.73.13.02.92.73.53.33.33.53.43.12.92.53.03.03.22.53.53.02.82.63.23.3

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value595458593569595515685636594514701601580465580521545521613571540496662591573611571508502414501480512396561473429403471
Percentage of AccountsPayableCurrent94.693.595.395.294.994.794.793.595.396.396.796.396.897.197.096.797.597.696.897.496.896.997.697.897.696.797.697.998.097.297.997.897.296.897.697.796.697.695.7
Percentage of Assets2.11.72.22.22.42.12.82.72.52.23.02.72.72.22.72.52.72.63.02.92.82.63.53.23.23.43.33.02.92.42.92.93.12.53.43.02.72.63.0
Percentage of Assets cms:ConsumersEnergyCompany2.41.92.52.52.72.33.13.02.82.53.32.92.92.32.92.72.92.83.33.23.02.83.73.53.53.73.53.23.12.53.13.03.32.63.63.12.82.73.2

Accounts Payable Current

us-gaap:TaxesPayableCurrent



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value326330437125295295398107267265360902562603489325225434990235239316892252252978820621127983199206282103239239302283
Percentage of TaxesPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.11.21.60.51.21.21.60.41.11.21.60.41.21.21.60.41.21.31.70.51.21.21.60.51.31.31.70.51.21.21.60.51.21.31.70.61.51.51.91.9

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value34136348115829836943614827948454211125729135411426526235278166140149159283343353201316329376198271250287102163182199
Percentage of TaxesPayableCurrent104.6110.0110.1126.4101.0125.1109.5138.3104.5182.6150.6123.3100.4111.9101.7122.6105.2103.1100.986.770.658.647.2178.7125.8152.4118.9228.4153.4155.9134.8238.6136.2121.4101.899.068.276.265.9
Percentage of Assets1.21.31.80.61.21.51.80.61.22.12.40.51.21.31.60.51.31.31.70.40.90.70.80.91.61.92.01.21.81.92.21.21.71.51.70.61.01.21.3
Percentage of Assets cms:ConsumersEnergyCompany1.41.52.00.71.31.72.00.71.32.32.60.51.31.51.80.61.41.41.90.40.90.80.80.91.72.12.21.21.92.02.31.31.71.61.80.71.11.21.3

Taxes Payable Current

us-gaap:OtherLiabilitiesCurrent



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value181162186170182148147134117134195130145135199159127118142130123117163124129131146136139134152137136139159131122109144123
Percentage of OtherLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.60.60.70.70.70.60.60.60.50.60.80.60.70.60.90.80.60.60.70.70.60.60.80.70.70.70.80.80.80.80.90.80.80.91.00.80.80.70.90.8

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value11710511812714211512096841031599310899164127938710910093901359997101112991009710910510810311994857695
Percentage of OtherLiabilitiesCurrent64.664.863.474.778.077.781.671.671.876.981.571.574.573.382.479.973.273.776.876.975.676.982.879.875.277.176.772.871.972.471.776.679.474.174.871.869.769.766.0
Percentage of Assets0.40.40.40.50.60.50.50.40.40.50.70.40.50.50.80.60.50.40.50.50.50.50.70.50.50.60.60.60.60.60.60.60.70.60.70.60.50.50.6
Percentage of Assets cms:ConsumersEnergyCompany0.50.40.50.60.60.50.50.40.40.50.80.50.50.50.80.70.50.50.60.60.50.50.80.60.60.60.70.60.60.60.70.70.70.70.80.60.60.50.6

us-gaap:RestructuringCostAndReserve, us-gaap:RestructuringPlan

cms:RetentionBenefits, cms:D.E.KarnGeneratingComplex


Period End2020-06-302020-03-31
Value54
Percentage of OtherLiabilitiesCurrent2.82.5
Percentage of Assets0.00.0
Percentage of Assets cms:RetentionBenefits cms:D.E.KarnGeneratingComplex0.00.0

Other Liabilities Current

us-gaap:LiabilitiesNoncurrent



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value20207192851907818850180181779217113156851606815753157881528715266152901467714477141791384414063137251374313760134641302612474124681198012089122671227412096118831133111248110421065710702104211075810364
Percentage of LiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets70.770.371.172.571.271.869.865.668.968.968.569.169.870.767.969.569.369.169.170.671.471.770.270.970.469.668.871.270.471.170.671.569.569.667.166.867.166.668.967.9

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value14735144321425014046135121343013487122621276012180124751216912160121781191311716112151119511381111401125511258111841050798499874984210140104301018310283100719696967496269264938593169498
Percentage of LiabilitiesNoncurrent72.974.874.774.575.075.578.878.279.477.379.079.679.779.681.280.979.180.980.981.281.981.883.180.779.079.282.283.985.083.085.084.885.686.087.286.987.789.488.3
Percentage of Assets51.652.653.154.053.454.255.051.354.753.354.155.055.656.355.156.254.855.956.057.358.558.658.357.255.655.156.559.759.859.060.060.659.559.958.558.158.959.660.8
Percentage of Assets cms:ConsumersEnergyCompany58.859.660.161.260.360.961.257.160.058.159.159.760.261.459.761.760.060.861.062.063.063.162.762.160.160.560.863.063.662.663.263.762.363.461.561.562.162.364.0

Liabilities Noncurrent

us-gaap:LongTermDebtNoncurrent



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value13414125451195112040112361110510615886992728996912390249091912986408722848681708441790380408143801680427535753671017089669567416710671162216193604060376184592664485895
Percentage of LongTermDebtNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets46.945.744.546.344.444.843.337.139.839.339.640.841.642.240.041.841.540.841.540.641.842.441.843.842.542.040.841.738.439.039.240.438.238.336.737.838.837.941.338.6

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value786776167048708765466565677952395738521155615275533954195253536549224934520649695141515451545230455545674579459142764086429743083967397739873997416941794488
Percentage of LongTermDebtNoncurrent58.660.759.058.958.359.163.959.161.957.961.058.558.759.460.861.558.060.461.762.963.963.364.365.060.560.664.564.863.960.664.064.263.864.266.066.267.470.569.6
Percentage of Assets27.527.726.327.225.926.527.621.924.622.824.123.824.425.124.325.724.124.625.625.526.726.826.928.525.725.526.327.024.523.725.125.924.324.624.225.026.126.728.7
Percentage of Assets cms:ConsumersEnergyCompany31.431.529.730.929.229.830.824.427.024.926.425.926.427.326.328.326.326.827.927.628.828.928.930.927.828.028.328.526.125.126.427.325.526.025.526.527.627.930.2

Long Term Debt Noncurrent

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value140141674447443440436797787778766760770781789560570581591847846844872242241240239740139313981451129112891288128911391136113511351460
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.50.52.51.71.81.81.83.33.43.43.33.43.53.63.62.72.82.92.94.44.44.44.51.31.41.31.44.48.08.18.57.87.98.07.87.17.17.37.39.6

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value10210362240440039639274173172171170371272373050051051952977076876679318318218017970213291334138512291227122512251081107810761076
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent72.973.092.390.490.390.089.993.092.992.792.892.592.592.692.589.389.589.389.590.990.890.890.975.675.575.074.994.995.495.495.595.295.295.195.094.994.994.894.8
Percentage of Assets0.40.42.31.61.61.61.63.13.13.23.13.23.33.33.42.42.52.62.64.04.04.04.11.01.01.01.04.17.67.78.17.47.57.67.46.86.86.96.9
Percentage of Assets cms:ConsumersEnergyCompany0.40.42.61.81.81.81.83.43.43.43.43.43.53.63.72.62.72.82.84.34.34.34.41.11.11.11.14.48.18.28.57.87.98.07.87.27.17.27.3

Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent

us-gaap:MinorityInterest



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value37373737373737373737373737373737373737373737373737373737374444444444444444444497
Percentage of MinorityInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.10.10.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.30.30.30.30.30.30.30.30.30.30.6

Minority Interest

us-gaap:OtherLiabilitiesNoncurrent



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value413395383373364345294295305307307308289295290283301314313299304304299307303307306316316311311323336328336265278288267310
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.41.41.41.41.41.41.21.21.31.31.31.41.31.41.31.41.51.61.51.51.61.61.61.71.71.71.81.91.81.81.81.92.12.02.01.71.71.81.72.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value334311304298291274230233243244241241219223218212231243236239243241237243251253252260259253252252262254256178186187176
Percentage of OtherLiabilitiesNoncurrent80.978.779.479.979.979.478.279.079.779.578.578.275.875.675.274.976.777.475.479.979.979.379.379.282.882.482.482.382.081.481.078.078.077.476.267.266.964.965.9
Percentage of Assets1.21.11.11.11.21.10.91.01.01.11.01.11.01.01.01.01.11.21.21.21.31.31.21.31.41.41.41.51.51.51.51.51.61.61.61.11.21.21.1
Percentage of Assets cms:ConsumersEnergyCompany1.31.31.31.31.31.21.01.11.11.21.11.21.11.11.11.11.21.31.31.31.41.31.31.41.51.61.61.61.61.61.51.61.71.71.61.21.21.31.2

Other Liabilities Noncurrent

us-gaap:StockholdersEquity



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value5214518550184957485148584755474946724596444145354449437042534259415641093938390238183802367036703645361834543396332333063194319631113049302830432958288727932602
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets18.218.918.719.119.219.619.419.920.020.119.320.520.320.219.720.420.320.519.420.119.819.819.120.020.620.219.820.019.119.118.619.219.118.918.419.118.618.517.917.1

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value846880667700769976107287688368866851667664516495642562095902592458795679550954855429547952405214521350584820480047544759453845594540445943504367430943104136
Percentage of StockholdersEquity162.4155.6153.4155.3156.9150.0144.8145.0146.6145.3145.3143.2144.4142.1138.8139.1141.5138.2139.9140.6142.2144.1142.8142.1143.0139.8139.5141.3143.1144.0142.1142.6145.9146.2143.7143.5145.7149.3148.1
Percentage of Assets29.629.428.729.630.129.428.128.829.429.228.029.429.428.727.328.428.728.327.128.228.228.527.328.429.428.227.728.327.327.626.527.527.927.626.427.427.027.626.5
Percentage of Assets cms:ConsumersEnergyCompany33.833.332.533.633.933.031.332.032.231.930.631.931.831.329.631.231.430.829.530.530.430.729.430.831.831.029.829.829.029.227.928.829.229.227.829.028.528.827.9

Stockholders Equity

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value52515222505549944888489547924786470946334478457244864407429042964193414639753939385538393707370736823655349134333360335032383240315530933072308730022931283728662993294129382815
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets18.419.018.819.219.319.719.520.020.220.319.420.720.520.419.820.620.520.719.520.220.020.019.320.220.820.420.020.219.319.418.919.519.419.118.719.318.818.718.20.00.00.019.30.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-31
Value85058103773777367647732469206923688867136488653264626246593959615916571655465522546655165277525152505095485748374791480345824603458445034394441143534354418042064132405038583749
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest162.0155.2153.1154.9156.4149.6144.4144.7146.3144.9144.9142.9144.0141.7138.4138.8141.1137.9139.5140.2141.8143.7142.4141.7142.6139.4139.1140.9142.6143.4141.5142.1145.3145.6143.0142.9145.0148.5147.3146.8138.1137.7131.3133.2
Percentage of Assets29.829.528.829.730.229.528.229.029.529.428.129.529.628.927.528.628.928.527.328.428.428.727.528.629.628.427.928.527.527.826.727.728.127.926.727.627.327.826.80.00.00.025.30.0
Percentage of Assets cms:ConsumersEnergyCompany33.933.532.633.734.133.231.432.232.432.030.832.132.031.529.831.431.631.029.730.730.630.929.631.032.031.230.030.129.229.528.229.129.529.528.129.328.829.128.20.00.00.026.40.0

us-gaap:CumulativeEffectPeriodOfAdoption, us-gaap:StatementEquityComponents

srt:CumulativeEffectPeriodOfAdoptionAdjustment, us-gaap:RetainedEarnings


Period End2020-03-312019-12-312019-03-312018-12-31
Value0-5100
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.0-1.00.00.0
Percentage of Assets0.0-0.20.00.0
Percentage of Assets srt:CumulativeEffectPeriodOfAdoptionAdjustment us-gaap:RetainedEarnings0.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value-68-68-69-62-62-63-63-59-60-60-50-49-49-50-50-42-43-43-43-45-46-47-48-20-20-21-21-38-54-55-56-45-46-47-48-38-38-39-39-30-30-31-32-27-15
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-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-0.2-0.2-0.3-0.2-0.2-0.3-0.3-0.2-0.3-0.3-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.3-0.1-0.1-0.1-0.1-0.2-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.2-0.2-0.2-0.20.00.00.0-0.20.00.0
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
us-gaap:AccumulatedGainLossNetCashFlowHedgeParent


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value-8-8-4-5-5-3-2
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-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
Percentage of Assets us-gaap:AccumulatedGainLossNetCashFlowHedgeParent0.00.00.00.00.00.00.0
us-gaap:AccumulatedOtherComprehensiveIncome


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value-76-76-73-67-67-66-65-59-61-61-50-47-48-49-50-45-47-47-47-49-48-48-49-20-20-21-22-39-56-54-55-43-45-47-49-40-38-40-40-31-31-32-33-28-144
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-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-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.2-0.3-0.3-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.3-0.2-0.3-0.3-0.1-0.1-0.1-0.1-0.2-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.2-0.3-0.30.00.00.0-0.20.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
us-gaap:AdditionalPaidInCapital


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value521752075113510450975087508850835076503750195013500649274916490849064897483748294812478347744767476147464715470847104703466946624664464146274622462145994588458145694564456045334517
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest99.499.7101.1102.2104.3103.9106.2106.2107.8108.7112.1109.6111.6111.8114.6114.2117.0118.1121.7122.6124.8124.6128.8128.6129.3129.8135.1137.1140.2140.4144.2143.9147.8150.0150.6149.7153.9156.9161.7159.8152.7155.2155.2161.00.0
Percentage of Assets18.319.019.119.620.220.520.721.321.822.021.822.722.922.822.723.524.024.423.824.825.024.924.925.926.926.527.127.727.027.227.328.128.628.728.129.029.029.429.40.00.00.029.90.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
us-gaap:CommonStock


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value333333333333333333333333333333333333332222222
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
us-gaap:NoncontrollingInterest


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value373737373737373737373737373737373737373737373737373737373744444444444444444444454544979697
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.70.70.70.70.80.80.80.80.80.80.80.80.80.80.90.90.90.90.90.91.01.01.01.01.01.01.11.11.11.31.41.41.41.41.41.41.51.51.61.61.51.53.33.40.0
Percentage of Assets0.10.10.10.10.10.10.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.30.30.30.30.30.30.30.30.30.30.00.00.00.60.00.0
Percentage of Assets us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
us-gaap:RetainedEarnings


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value7051-25-83-182-166-271-278-346-383-531-434-512-511-616-607-706-744-855-881-949-936-1058-1080-1099-1110-1242-1276-1334-1346-1423-1426-1511-1548-1553-1542-1628-1675-1757-1731-1831-1876-1927-2031-2227
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest1.31.0-0.5-1.7-3.7-3.4-5.7-5.8-7.3-8.3-11.9-9.5-11.4-11.6-14.4-14.1-16.8-17.9-21.5-22.4-24.6-24.4-28.5-29.1-29.8-30.4-35.6-37.2-39.7-40.2-43.9-44.0-47.9-50.0-50.6-50.0-54.2-57.1-61.9-60.4-61.2-63.8-65.6-72.10.0
Percentage of Assets0.20.2-0.1-0.3-0.7-0.7-1.1-1.2-1.5-1.7-2.3-2.0-2.3-2.4-2.8-2.9-3.5-3.7-4.2-4.5-4.9-4.9-5.5-5.9-6.2-6.2-7.1-7.5-7.7-7.8-8.3-8.6-9.3-9.6-9.4-9.7-10.2-10.7-11.30.00.00.0-12.60.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents, dei:LegalEntity

us-gaap:AccumulatedDefinedBenefitPlansAdjustment, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value-28-28-28-20-20-21-21-27-28-28-24-21
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-0.5-0.5-0.6-0.4-0.4-0.4-0.4-0.6-0.6-0.6-0.5-0.5
Percentage of Assets-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment cms:ConsumersEnergyCompany0.00.00.00.00.00.00.00.00.00.00.00.0
us-gaap:AccumulatedOtherComprehensiveIncome, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value-28-28-28-20-20-21-21-27-29-29-12-3
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-0.5-0.5-0.6-0.4-0.4-0.4-0.4-0.6-0.6-0.6-0.3-0.1
Percentage of Assets-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome cms:ConsumersEnergyCompany0.00.00.00.00.00.00.00.00.00.00.00.0
us-gaap:AdditionalPaidInCapital, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value602457245374537453745049469946994699454944493999
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest114.7109.6106.3107.6109.9103.198.198.299.898.299.493.2
Percentage of Assets21.120.920.020.721.220.419.219.720.219.919.318.5
Percentage of Assets us-gaap:AdditionalPaidInCapital cms:ConsumersEnergyCompany0.00.00.00.00.00.00.00.00.00.00.00.0
us-gaap:RetainedEarnings, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value163115291513150414151418136413731340131511731065
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest31.129.329.930.128.929.028.528.728.528.426.224.8
Percentage of Assets5.75.65.65.85.65.75.65.75.75.85.14.9
Percentage of Assets us-gaap:RetainedEarnings cms:ConsumersEnergyCompany0.00.00.00.00.00.00.00.00.00.00.00.0

Stockholders Equity Including Portion Attributable To Noncontrolling Interest

us-gaap:CommonStockValue



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value3333333333333333333333333333333333333322
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:AdditionalPaidInCapitalCommonStock



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value5217520751135104509750875088508350765037501950135006492749164908490648974837482948124783477447674761474647154708471047034669466246644641462746224621459945884560
Percentage of AdditionalPaidInCapitalCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets18.319.019.119.620.220.520.721.321.822.021.822.722.922.822.723.524.024.423.824.825.024.924.925.926.926.527.127.727.027.227.328.128.628.728.129.029.029.429.429.9

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value602457245374537453745049469946994699454944494449444942493999399939993874372437243724372435743574357234073257325732573257310731073107310729572957295729572832
Percentage of AdditionalPaidInCapitalCommonStock115.5109.9105.1105.3105.499.392.492.492.690.388.688.788.986.281.381.581.579.177.077.177.477.974.975.075.071.869.169.269.269.366.566.666.666.963.964.064.064.361.7
Percentage of Assets21.120.920.020.721.220.419.219.720.219.919.320.120.319.718.519.219.519.318.319.119.419.418.619.420.219.018.719.218.718.918.118.719.119.218.018.518.518.918.1
Percentage of Assets cms:ConsumersEnergyCompany24.023.622.723.424.022.921.321.922.121.721.121.822.021.420.021.121.421.020.020.720.820.920.021.121.820.920.120.219.820.019.119.720.020.418.919.619.619.819.1

Additional Paid In Capital Common Stock

us-gaap:RetainedEarningsAccumulatedDeficit



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value7051-25-83-182-166-271-278-346-383-531-434-512-511-616-607-706-744-855-881-949-936-1058-1080-1099-1110-1242-1276-1334-1346-1423-1426-1511-1548-1553-1542-1628-1675-1757-1927
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.2-0.1-0.3-0.7-0.7-1.1-1.2-1.5-1.7-2.3-2.0-2.3-2.4-2.8-2.9-3.5-3.7-4.2-4.5-4.9-4.9-5.5-5.9-6.2-6.2-7.1-7.5-7.7-7.8-8.3-8.6-9.3-9.6-9.4-9.7-10.2-10.7-11.3-12.6

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value16311529151315041415141813641373134013151173121311431128106510871040967950931876925832797798810724711665667598611593515554569511512463
Percentage of RetainedEarningsAccumulatedDeficit2330.02998.0-6052.0-1812.0-777.5-854.2-503.3-493.9-387.3-343.3-220.9-279.5-223.2-220.7-172.9-179.1-147.3-130.0-111.1-105.7-92.3-98.8-78.6-73.8-72.6-73.0-58.3-55.7-49.9-49.6-42.0-42.8-39.2-33.3-35.7-36.9-31.4-30.6-26.4
Percentage of Assets5.75.65.65.85.65.75.65.75.75.85.15.55.25.24.95.25.14.84.74.84.64.84.34.34.54.54.24.23.83.93.53.73.63.23.43.63.23.33.0
Percentage of Assets cms:ConsumersEnergyCompany6.56.36.46.66.36.46.26.46.36.35.66.05.75.75.35.75.65.25.15.24.95.24.74.74.95.04.54.44.14.13.73.93.83.43.53.83.43.43.1

Retained Earnings Accumulated Deficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value-76-76-73-67-67-66-65-59-61-61-50-47-48-49-50-45-47-47-47-49-48-48-49-20-20-21-22-39-56-54-55-43-45-47-49-40-38-40-40-33
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-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

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-312013-09-302013-06-302013-03-312012-12-312012-06-302012-03-312011-12-312010-12-31
Value-28-28-28-20-20-21-21-27-29-29-12-8-8-9-3-3-1-3-6-11-12-11-722-2-9-9-6-8-1-4-20
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax36.836.838.429.929.931.832.345.847.547.524.017.016.718.46.06.72.16.412.822.425.022.914.3-10.0-10.09.123.116.111.114.52.28.54.1-0.0
Percentage of Assets-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.1-0.1-0.1-0.00.00.0-0.0-0.1-0.1-0.0-0.0-0.0-0.0-0.00.0
Percentage of Assets cms:ConsumersEnergyCompany-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.1-0.1-0.1-0.00.00.0-0.0-0.1-0.1-0.0-0.0-0.0-0.0-0.00.0

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:MinorityInterest



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value37373737373737373737373737373737373737373737373737373737374444444444444444444497
Percentage of MinorityInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.10.10.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.30.30.30.30.30.30.30.30.30.30.6

Minority Interest

us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueNewIssues

us-gaap:AdditionalPaidInCapital


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value1110610810757398780839701729107837782972387226564
Percentage of StockIssuedDuringPeriodValueNewIssues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Stock Issued During Period Value New Issues

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-09-302017-03-312014-03-312013-03-312012-03-312011-03-312010-03-31
Value59520139521056861713814970880646611725635841657
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues41.210.822.013.639.330.07.59.336.35.235.324.236.636.440.933.4

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-09-302017-03-312014-03-312013-03-312012-03-312011-03-312010-03-31
Value54323835014149161919415772084648646713681867683
Percentage of NetCashProvidedByUsedInOperatingActivities91.3118.488.667.186.4100.3140.6105.4101.7105.0100.3105.798.3107.2103.1104.0
Percentage of Revenues37.612.819.59.134.030.110.69.836.95.535.425.636.039.142.234.7
Percentage of Revenues cms:ConsumersEnergyCompany40.813.621.09.936.831.911.310.538.85.837.327.137.240.743.636.1

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-09-302017-03-312014-03-312013-03-312012-03-312011-03-312010-03-31
Value-609000000.0-559000000.0-604000000.0-802000000.0-735000000.0-675000000.0-791000000.0-807000000.0-456000000.0-548000000.0-346000000.0-346000000.0-293000000.0-313000000.0-228000000.0-212000000.0
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-42.2-30.0-33.6-51.9-50.9-32.8-43.2-50.5-23.3-35.9-18.9-13.7-14.8-18.0-11.1-10.8

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-09-302017-03-312014-03-312013-03-312012-03-312011-03-312010-03-31
Value-451000000.0-542000000.0-554000000.0-557000000.0-524000000.0-502000000.0-536000000.0-521000000.0-444000000.0-476000000.0-382000000.0-315000000.0-295000000.0-312000000.0-228000000.0-202000000.0
Percentage of NetCashProvidedByUsedInInvestingActivities74.197.091.769.571.374.467.864.697.486.9110.491.0100.799.7100.095.3
Percentage of Revenues-31.3-29.1-30.9-36.0-36.3-24.4-29.3-32.6-22.7-31.2-20.9-12.5-14.9-17.9-11.1-10.3
Percentage of Revenues cms:ConsumersEnergyCompany-33.9-31.1-33.2-39.0-39.3-25.8-31.3-34.7-23.9-33.1-22.0-13.2-15.4-18.6-11.5-10.7

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-09-302017-03-312014-03-312013-03-312012-03-312011-03-312010-03-31
Value7571062-67691234150462523-229200-9432161-125-61221
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues52.557.0-3.744.716.27.325.332.7-11.713.1-5.112.73.1-7.2-3.011.2

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-09-302017-03-312014-03-312013-03-312012-03-312011-03-312010-03-31
Value509904-52488181-109360126-195113-206-171-68-281371
Percentage of NetCashProvidedByUsedInFinancingActivities67.285.177.670.677.4-72.777.924.185.256.5219.1-53.3-111.5224.8-4.932.1
Percentage of Revenues35.348.5-2.931.612.5-5.319.77.9-10.07.4-11.3-6.8-3.4-16.10.13.6
Percentage of Revenues cms:ConsumersEnergyCompany38.351.8-3.134.113.6-5.621.08.4-10.57.9-11.9-7.2-3.5-16.80.23.8

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-09-302017-03-312014-03-312013-03-312012-03-312011-03-312010-03-31
Value59520139521056861713814970880646611725635841657
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues41.210.822.013.639.330.07.59.336.35.235.324.236.636.440.933.4

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-09-302017-03-312014-03-312013-03-312012-03-312011-03-312010-03-31
Value54323835014149161919415772084648646713681867683
Percentage of NetCashProvidedByUsedInOperatingActivities91.3118.488.667.186.4100.3140.6105.4101.7105.0100.3105.798.3107.2103.1104.0
Percentage of Revenues37.612.819.59.134.030.110.69.836.95.535.425.636.039.142.234.7
Percentage of Revenues cms:ConsumersEnergyCompany40.813.621.09.936.831.911.310.538.85.837.327.137.240.743.636.1

Net Cash Provided By Used In Operating Activities

us-gaap:NetIncomeLoss



Period End2020-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value13616720793213108169139241-317292199771861241641061486720296948320410212680144671481006741139100135251458288
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues9.49.313.46.410.35.910.69.312.3-0.211.36.310.94.711.79.09.17.010.05.09.65.56.65.78.15.98.75.77.34.09.87.53.82.59.57.36.61.510.06.14.5

us-gaap:ConsolidationItems

cms:CorporateAndReconcilingItems


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-30
Value-33-102-13-15-24-15-26-82-17-18
Percentage of NetIncomeLoss-24.3-61.1-6.3-16.1-22.2-8.9-18.72733.3-9.9-19.6
Percentage of Revenues-2.3-5.7-0.8-1.0-1.3-0.9-1.7-4.6-1.1-1.2
Percentage of Revenues cms:CorporateAndReconcilingItems0.00.0-22.4-28.3-52.2-37.5-72.2-234.3-53.1-56.2

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, cms:ElectricUtility


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-30
Value1199122390671991306117694
Percentage of NetIncomeLoss87.554.5107.796.862.0117.893.5-2033.3102.3102.2
Percentage of Revenues8.25.114.46.23.712.48.73.411.56.5
Percentage of Revenues us-gaap:OperatingSegments cms:ElectricUtility11.68.617.88.86.215.211.95.614.18.7
us-gaap:OperatingSegments, cms:EnerBank


Period End2020-06-302019-06-30
Value810
Percentage of NetIncomeLoss5.910.8
Percentage of Revenues0.60.7
Percentage of Revenues us-gaap:OperatingSegments cms:EnerBank13.118.9
us-gaap:OperatingSegments, cms:Enterprises


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-30
Value1157101414-5487
Percentage of NetIncomeLoss0.79.03.410.80.92.410.11800.04.77.6
Percentage of Revenues0.10.80.50.70.10.30.9-3.00.50.5
Percentage of Revenues us-gaap:OperatingSegments cms:Enterprises1.923.411.917.21.47.023.0-94.713.812.7
us-gaap:OperatingSegments, cms:GasUtility


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-30
Value41114-10864-19217259
Percentage of NetIncomeLoss30.168.3-4.88.659.3-11.215.1-2400.02.99.8
Percentage of Revenues2.86.4-0.60.63.5-1.21.44.00.30.6
Percentage of Revenues us-gaap:OperatingSegments cms:GasUtility13.318.7-5.62.610.1-10.16.912.02.63.2

Net Income Loss

us-gaap:ProfitLoss



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value13724316820794213109169140241-217293199781861251641071486820297948420410212781144671491016741140101135251468488
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues9.513.09.413.46.510.36.010.69.412.3-0.111.36.410.94.811.79.19.17.110.05.09.65.56.65.78.15.98.85.87.34.09.97.63.82.59.67.46.61.510.16.34.5

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value1602352062139822613118015224213618110421111719513217213516084215118119109221119153100162781631227667155921537916088107
Percentage of ProfitLoss116.896.7122.6102.9104.3106.1120.2106.5108.6100.4-6800.0105.2111.8106.0150.0104.8105.6104.9126.2108.1123.5106.4121.6126.6129.8108.3116.7120.5123.5112.5116.4109.4120.8113.4163.4110.791.1113.3316.0109.6104.8121.6
Percentage of Revenues11.112.611.513.86.811.07.211.310.212.47.611.97.211.57.112.39.69.68.910.86.210.26.78.37.48.86.910.67.18.24.710.89.24.44.110.66.77.44.711.16.65.4
Percentage of Revenues cms:ConsumersEnergyCompany12.013.512.314.97.311.67.712.010.913.08.112.67.612.17.513.010.210.09.411.36.610.67.18.87.99.37.111.07.58.44.911.39.54.54.311.17.17.74.911.76.95.7

us-gaap:ConsolidationItems

cms:CorporateAndReconcilingItems


Period End2020-03-312019-03-312018-03-31
Value-26-14-16
Percentage of ProfitLoss-10.7-6.6-6.6
Percentage of Revenues-1.4-0.7-0.8
Percentage of Revenues cms:CorporateAndReconcilingItems0.0-28.6-45.7

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, cms:ElectricUtility


Period End2020-03-312019-03-312018-03-31
Value118105139
Percentage of ProfitLoss48.649.357.7
Percentage of Revenues6.35.17.1
Percentage of Revenues us-gaap:OperatingSegments cms:ElectricUtility11.59.512.9
us-gaap:OperatingSegments, cms:EnerBank


Period End2020-03-312019-03-31
Value1411
Percentage of ProfitLoss5.85.2
Percentage of Revenues0.80.5
Percentage of Revenues us-gaap:OperatingSegments cms:EnerBank22.622.4
us-gaap:OperatingSegments, cms:Enterprises


Period End2020-03-312019-03-312018-03-31
Value20115
Percentage of ProfitLoss8.20.56.2
Percentage of Revenues1.10.00.8
Percentage of Revenues us-gaap:OperatingSegments cms:Enterprises34.51.523.8
us-gaap:OperatingSegments, cms:GasUtility


Period End2020-03-312019-03-312018-03-31
Value117121103
Percentage of ProfitLoss48.156.842.7
Percentage of Revenues6.35.95.3
Percentage of Revenues us-gaap:OperatingSegments cms:GasUtility16.314.413.3

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

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


Period End2020-03-312019-03-31
Value118105
Percentage of ProfitLoss48.649.3
Percentage of Revenues6.35.1
Percentage of Revenues us-gaap:OperatingSegments cms:ElectricUtility cms:ConsumersEnergyCompany11.59.5
us-gaap:OperatingSegments, cms:GasUtility, cms:ConsumersEnergyCompany


Period End2020-03-312019-03-31
Value117121
Percentage of ProfitLoss48.156.8
Percentage of Revenues6.35.9
Percentage of Revenues us-gaap:OperatingSegments cms:GasUtility cms:ConsumersEnergyCompany16.314.4

us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest


Period End2020-06-302019-09-302019-06-302018-09-302018-06-302017-09-302017-06-30
Value1010101
Percentage of ProfitLoss0.70.01.10.00.70.01.1
Percentage of Revenues0.10.00.10.00.10.00.1
Percentage of Revenues us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.0
us-gaap:RetainedEarnings


Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-03-312012-06-302012-03-312011-06-302011-03-312010-06-302010-03-31
Value1362432079321316913924117292199186124164148672029483204144100671001358288
Percentage of ProfitLoss99.3100.0100.098.9100.0100.099.3100.0100.098.9100.0100.099.2100.0100.098.5100.0100.098.8100.0100.099.0100.099.0100.097.6100.0
Percentage of Revenues9.413.013.46.410.310.69.312.311.36.310.911.79.09.110.05.09.66.65.78.17.37.53.87.36.66.14.5
Percentage of Revenues us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents, dei:LegalEntity

us-gaap:RetainedEarnings, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value16023520621398226131180152
Percentage of ProfitLoss116.896.7122.6102.9104.3106.1120.2106.5108.6
Percentage of Revenues11.112.611.513.86.811.07.211.310.2
Percentage of Revenues us-gaap:RetainedEarnings cms:ConsumersEnergyCompany0.00.00.00.00.00.00.00.00.0

Profit Loss

us-gaap:DepreciationDepletionAndAmortization



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-03-312011-03-312010-03-31
Value223316263215216298244206204279193197262183176238173169222153151199145137181138172162172
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Depreciation Depletion And Amortization

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-31
Value-443-39147-6712-42100212410168-48-47
Percentage of IncreaseDecreaseInOtherOperatingCapitalNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-31
Value-18-181211022-15-2768-4811684-3-49-44
Percentage of IncreaseDecreaseInOtherOperatingCapitalNet40.9-600.0-30.874.8-32.8-125.064.368.0-2400.093.583.2-4.4102.193.6

Increase Decrease In Other Operating Capital Net

us-gaap:IncreaseDecreaseInInventories



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-312011-03-312010-03-31
Value72-171-93147111-209-90177-228-201-274-378-345-447-312-462-460
Percentage of IncreaseDecreaseInInventories100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-312011-03-312010-03-31
Value71-170-92148108-204-90173-226-197-270-374-338-442-302-458-459
Percentage of IncreaseDecreaseInInventories98.699.498.9100.797.397.6100.097.799.198.098.598.998.098.996.899.199.8

Increase Decrease In Inventories

us-gaap:NetCashProvidedByUsedInInvestingActivities



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-09-302017-03-312014-03-312013-03-312012-03-312011-03-312010-03-31
Value-609000000.0-559000000.0-604000000.0-802000000.0-735000000.0-675000000.0-791000000.0-807000000.0-456000000.0-548000000.0-346000000.0-346000000.0-293000000.0-313000000.0-228000000.0-212000000.0
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-42.2-30.0-33.6-51.9-50.9-32.8-43.2-50.5-23.3-35.9-18.9-13.7-14.8-18.0-11.1-10.8

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-09-302017-03-312014-03-312013-03-312012-03-312011-03-312010-03-31
Value-451000000.0-542000000.0-554000000.0-557000000.0-524000000.0-502000000.0-536000000.0-521000000.0-444000000.0-476000000.0-382000000.0-315000000.0-295000000.0-312000000.0-228000000.0-202000000.0
Percentage of NetCashProvidedByUsedInInvestingActivities74.197.091.769.571.374.467.864.697.486.9110.491.0100.799.7100.095.3
Percentage of Revenues-31.3-29.1-30.9-36.0-36.3-24.4-29.3-32.6-22.7-31.2-20.9-12.5-14.9-17.9-11.1-10.3
Percentage of Revenues cms:ConsumersEnergyCompany-33.9-31.1-33.2-39.0-39.3-25.8-31.3-34.7-23.9-33.1-22.0-13.2-15.4-18.6-11.5-10.7

Net Cash Provided By Used In Investing Activities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-312011-03-31
Value423523534597492481502700422365407348304274294191
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-312011-03-31
Value416520526596487476483480414361406345302273294186
Percentage of PaymentsToAcquirePropertyPlantAndEquipment98.399.498.599.899.099.096.268.698.198.999.899.199.399.6100.097.4

Payments To Acquire Property Plant And Equipment

us-gaap:NetCashProvidedByUsedInFinancingActivities



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-09-302017-03-312014-03-312013-03-312012-03-312011-03-312010-03-31
Value7571062-67691234150462523-229200-9432161-125-61221
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues52.557.0-3.744.716.27.325.332.7-11.713.1-5.112.73.1-7.2-3.011.2

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-09-302017-03-312014-03-312013-03-312012-03-312011-03-312010-03-31
Value509904-52488181-109360126-195113-206-171-68-281371
Percentage of NetCashProvidedByUsedInFinancingActivities67.285.177.670.677.4-72.777.924.185.256.5219.1-53.3-111.5224.8-4.932.1
Percentage of Revenues35.348.5-2.931.612.5-5.319.77.9-10.07.4-11.3-6.8-3.4-16.10.13.6
Percentage of Revenues cms:ConsumersEnergyCompany38.351.8-3.134.113.6-5.621.08.4-10.57.9-11.9-7.2-3.5-16.80.23.8

Net Cash Provided By Used In Financing Activities

us-gaap:ProceedsFromIssuanceOfLongTermDebt



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-312011-03-312010-03-31
Value11551198756214629931723250250923301005502503900300
Percentage of ProceedsFromIssuanceOfLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-03-31
Value65587375621297015620349
Percentage of ProceedsFromIssuanceOfLongTermDebt56.772.9100.0100.064.30.090.70.037.8

Proceeds From Issuance Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-312011-03-312010-03-31
Value390211566314790116545180475301126104591334
Percentage of RepaymentsOfLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-03-312015-03-312014-03-312013-03-312012-03-312011-03-312010-03-31
Value36301303132158630330025011111031099
Percentage of RepaymentsOfLongTermDebt93.10.011.30.099.727.274.10.00.00.052.6100.042.3100.067.569.226.5
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations cms:ConsumersEnergyCompany0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-312011-03-312010-03-31
Value390211566314790116545180475301126104591334
Percentage of RepaymentsOfLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-03-312015-03-312014-03-312013-03-312012-03-312011-03-312010-03-31
Value36301303132158630330025011111031099
Percentage of RepaymentsOfLongTermDebt93.10.011.30.099.727.274.10.00.00.052.6100.042.3100.067.569.226.5
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations cms:ConsumersEnergyCompany0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Repayments Of Long Term Debt

us-gaap:EffectiveIncomeTaxRateContinuingOperations



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-312011-03-31
Value0.0239999999999999940.10.0010000000000000009-0.0050000000000000044-0.00300000000000000270.184-0.00200000000000000180.00500000000000000440.1420.3250.3110.3310.340.3970.3880.367
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-312011-03-31
Value0.0100000000000000090.158-0.00400000000000000360.00500000000000000440.00500000000000000440.1930.0060000000000000050.0090000000000000080.1540.3240.3230.3380.3440.3890.4060.372
Percentage of EffectiveIncomeTaxRateContinuingOperations41.7158.0-400.0-100.0-166.7104.9-300.0180.0108.599.7103.9102.1101.298.0104.6101.4

Effective Income Tax Rate Continuing Operations

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312014-12-31
Value1604861157433334267175366501227204173441463257368406288249
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-312014-12-31
Value12296282828421264563827614665853642121525013771112
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents76.672.917.865.663.524.032.010.455.164.331.949.182.545.859.113.633.724.745.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:StatementEquityComponents, dei:LegalEntity

cms:AdjustmentsToAdditionalPaidInCapitalStockholderContribution

us-gaap:AdditionalPaidInCapital, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value3003500032535000150
Percentage of AdjustmentsToAdditionalPaidInCapitalStockholderContribution100.0100.0100.0100.0100.0100.0100.0100.0100.0

cms:EffectiveIncomeTaxRateReconciliationAMTSequestrationPercent



Period End2020-06-302020-03-312019-06-302019-03-31
Value0.012-0.0330.00.0
Percentage of EffectiveIncomeTaxRateReconciliationAMTSequestrationPercent100.0100.0100.0100.0

cms:EffectiveIncomeTaxRateReconciliationRegulatoryTaxBenefits



Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-31
Value0.0-0.0150.00.0-0.0150.0-0.05-0.043-0.047-0.049-0.054
Percentage of EffectiveIncomeTaxRateReconciliationRegulatoryTaxBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-31
Value0.002999999999999999-0.0190.0079999999999999980.007000000000000003-0.0250.0030000000000000027-0.048-0.042-0.042-0.044-0.048
Percentage of EffectiveIncomeTaxRateReconciliationRegulatoryTaxBenefits100.0126.7100.0100.0166.7100.096.097.789.489.888.9

cms:FinancingIncome



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value65676362565450434039
Percentage of FinancingIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value4524354344
Percentage of FinancingIncome6.27.53.26.55.49.38.07.010.010.3

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, cms:ElectricUtility


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2323133322
Percentage of FinancingIncome3.14.53.24.81.85.66.07.05.05.1
us-gaap:OperatingSegments, cms:EnerBank


Period End2020-06-302020-03-312019-06-302019-03-31
Value61625349
Percentage of FinancingIncome93.892.594.690.7
us-gaap:OperatingSegments, cms:GasUtility


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2201221022
Percentage of FinancingIncome3.13.00.01.63.63.72.00.05.05.1

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

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


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value232313332
Percentage of FinancingIncome3.14.53.24.81.85.66.07.05.0
us-gaap:OperatingSegments, cms:GasUtility, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value220122102
Percentage of FinancingIncome3.13.00.01.63.63.72.00.05.0

cms:InterestAndDividendIncomeRelatedParties



Period End2020-06-302020-03-312019-06-302019-03-31
Value0700
Percentage of InterestAndDividendIncomeRelatedParties100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302016-06-302014-09-302013-09-302012-09-302011-09-30
Value1121111100011111
Percentage of InterestAndDividendIncomeRelatedParties100.014.30.00.0100.0100.00.00.00.00.00.00.00.00.00.00.0

us-gaap:LitigationCase

cms:LossContingencyNumberOfLawsuits

cms:ClassActionLawsuits


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-03-312016-03-31
Value0.04.00.00.00.04.00.00.04.04.04.0
Percentage of LossContingencyNumberOfLawsuits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
cms:IndividualLawsuits


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-03-312016-03-31
Value0.01.00.00.00.01.00.00.01.01.01.0
Percentage of LossContingencyNumberOfLawsuits100.025.0100.0100.0100.025.0100.0100.025.025.025.0

us-gaap:StatementEquityComponents

cms:OtherChangesInNoncontrollingInterests

us-gaap:NoncontrollingInterest


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-09-302017-06-302016-06-302015-06-302014-06-302013-09-302013-06-302012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value110110101111-1-8-1-10-1-10-1-1
Percentage of OtherChangesInNoncontrollingInterests100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cms:OtherNonoperatingIncomeExpenseRetirementBenefitsNet



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-31
Value30312322232322222224343111010
Percentage of OtherNonoperatingIncomeExpenseRetirementBenefitsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-31
Value282921212221202120223239109
Percentage of OtherNonoperatingIncomeExpenseRetirementBenefitsNet93.393.591.395.595.791.390.995.590.991.7100.050.0100.081.8100.090.0

cms:PurchasedPowerRelatedParties



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value14182219161822211919212122222122211723212224212323232022232021212121
Percentage of PurchasedPowerRelatedParties100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ReductionOfIncomeTaxExpense

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-03-312016-03-31
Value2500798141311
Percentage of ReductionOfIncomeTaxExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cms:StockOfferingProgramMaximumValue



Period End2020-04-302018-08-312017-03-31
Value500250100
Percentage of StockOfferingProgramMaximumValue100.0100.0100.0

us-gaap:TaxCreditCarryforward

cms:TaxCarryforwardAmountIncreaseDecrease

us-gaap:Research


Period End2020-03-31
Value9
Percentage of TaxCarryforwardAmountIncreaseDecrease100.0

us-gaap:TaxCreditCarryforward, dei:LegalEntity

us-gaap:Research, cms:ConsumersEnergyCompany


Period End2020-03-31
Value8
Percentage of TaxCarryforwardAmountIncreaseDecrease88.9

dei:LegalEntity

cms:UtilitiesOperatingExpensePurchasedPowerRelatedParties

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value141822191618222219202323
Percentage of UtilitiesOperatingExpensePurchasedPowerRelatedParties100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CapitalExpendituresIncurredButNotYetPaid



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-31
Value729535-155199-119102112173117116
Percentage of CapitalExpendituresIncurredButNotYetPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-31
Value728537-155385151290101154117116
Percentage of CapitalExpendituresIncurredButNotYetPaid100.089.5105.7100.0103.985.9-1500.063.288.290.289.0100.0100.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect



Period End2020-06-302020-03-312019-06-302019-03-31
Value7437046792
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-06-302019-03-31
Value6016001488
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect80.985.2220.98.7

us-gaap:CommonStockDividendsPerShareDeclared



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value0.40750.40750.382500000000000060.38250.38250.38250.357499999999999930.35750.35750.35750.33250.33250.330.310.310.310.290.290.290.270.270.270.2550.2550.2550.240.240.240.210.210.210.150.150.15
Percentage of CommonStockDividendsPerShareDeclared100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:ConcentrationRiskPercentage1

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


Period End2020-03-31
Value0.85
Percentage of ConcentrationRiskPercentage1100.0

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

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


Period End2020-03-31
Value0.97
Percentage of ConcentrationRiskPercentage1114.1

us-gaap:ConsolidatedEntities, us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:VariableRate

us-gaap:DebtInstrumentBasisSpreadOnVariableRate1

srt:ParentCompany, cms:TermLoanFacilityDueFebruary2021, cms:TermLoanFacility, us-gaap:LondonInterbankOfferedRateLIBOR


Period End2020-03-31
Value0.005
Percentage of DebtInstrumentBasisSpreadOnVariableRate1100.0

us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:VariableRate

cms:TermLoanFacilityDueJanuary2021, cms:TermLoanFacility, us-gaap:LondonInterbankOfferedRateLIBOR


Period End2020-03-31
Value0.0045
Percentage of DebtInstrumentBasisSpreadOnVariableRate190.0

us-gaap:LongtermDebtType, us-gaap:StatementScenario

cms:TermLoanFacility, us-gaap:ScenarioForecast


Period End2022-10-31
Value0.0175
Percentage of DebtInstrumentBasisSpreadOnVariableRate10.0

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

srt:ScenarioForecast, cms:TermLoanFacilityDue2025, cms:TermLoanFacility


Period End2022-10-31
Value0.0175
Percentage of DebtInstrumentBasisSpreadOnVariableRate10.0

us-gaap:LongtermDebtType, us-gaap:StatementScenario

us-gaap:DebtInstrumentInterestRateDuringPeriod

cms:TermLoanFacility, us-gaap:ScenarioForecast


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

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

srt:ScenarioForecast, cms:TermLoanFacilityDue2025, cms:TermLoanFacility


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

us-gaap:DeferredIncomeTaxesAndTaxCredits



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-312011-03-312010-03-31
Value28676129174392303790689910287427342
Percentage of DeferredIncomeTaxesAndTaxCredits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-312011-03-312010-03-31
Value23440-42417835369623946442039-19
Percentage of DeferredIncomeTaxesAndTaxCredits82.165.70.0-13.8141.239.590.216.78.176.791.239.445.150.647.653.4-45.2

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value-3000000.0-4000000.0-6000000.0-7000000.0-6000000.0-7000000.0-4000000.0-3000000.0-4000000.0-4000000.0-7000000.0-8000000.0-8000000.0-5000000.0-6000000.0
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
us-gaap:PensionPlansDefinedBenefit


Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value-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 DefinedBenefitPlanAmortizationOfGainsLosses733.3550.0171.4200.0171.4633.3475.0450.0285.7250.0250.0340.0300.0

us-gaap:RetirementPlanType, dei:LegalEntity

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-3000000.0-4000000.0-6000000.0-7000000.0-6000000.0-7000000.0-4000000.0-4000000.0-4000000.0
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses100.0100.0100.0100.0100.0100.0100.0133.3100.0
us-gaap:PensionPlansDefinedBenefit, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value-21000000.0-21000000.0-12000000.0-11000000.0-12000000.0-17000000.0-18000000.0
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses700.0525.0171.4183.3171.4566.7450.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value-14-14-15-16-15-16-17-16-17-17-8-9-9-10-11
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
us-gaap:PensionPlansDefinedBenefit


Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value1001010111111
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit-7.1-0.0-0.0-6.7-0.0-6.2-0.0-5.9-12.5-11.1-11.1-10.0-9.1

us-gaap:RetirementPlanType, dei:LegalEntity

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-13-14-15-15-16-15-16-17-16
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit92.9100.0100.093.8106.793.894.1106.294.1
us-gaap:PensionPlansDefinedBenefit, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value1001010
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit-7.1-0.0-0.0-6.7-0.0-6.2-0.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value252522222222242425242223222221
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
us-gaap:PensionPlansDefinedBenefit


Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value48484041403837373938383637
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets192.0192.0181.8186.4181.8158.3148.0154.2177.3165.2172.7163.6176.2

us-gaap:RetirementPlanType, dei:LegalEntity

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value242320212021232223
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets96.092.090.995.590.995.595.891.792.0
us-gaap:PensionPlansDefinedBenefit, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value46453838383534
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets184.0180.0172.7172.7172.7145.8136.0

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanInterestCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value981011101079991313131211
Percentage of DefinedBenefitPlanInterestCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
us-gaap:PensionPlansDefinedBenefit


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value202125242425232223222322222122
Percentage of DefinedBenefitPlanInterestCost222.2262.5250.0218.2240.0250.0328.6244.4255.6244.4176.9169.2169.2175.0200.0

us-gaap:RetirementPlanType, dei:LegalEntity

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value8810101010889
Percentage of DefinedBenefitPlanInterestCost88.9100.0100.090.9100.0100.0114.388.9100.0
us-gaap:PensionPlansDefinedBenefit, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value19202323232221
Percentage of DefinedBenefitPlanInterestCost211.1250.0209.1230.0230.0244.4233.3

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value-23-23-17-17-18-17-26-24-24-24-5-6-5-10-11
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
us-gaap:PensionPlansDefinedBenefit


Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value877671617161716161314
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost-34.8-30.4-41.2-33.3-41.2-66.7-70.8-66.7-340.0-266.7-320.0-130.0-127.3

us-gaap:RetirementPlanType, dei:LegalEntity

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-22-21-16-16-16-16-23-23-22
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost95.791.394.194.188.994.188.595.891.7
us-gaap:PensionPlansDefinedBenefit, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value787771716
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost-30.4-34.8-41.2-38.9-41.2-70.8-66.7

us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanServiceCost

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value444334445455554
Percentage of DefinedBenefitPlanServiceCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
us-gaap:PensionPlansDefinedBenefit


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-30
Value131210111010121212121211111010
Percentage of DefinedBenefitPlanServiceCost325.0300.0250.0366.7333.3250.0300.0300.0240.0300.0240.0220.0220.0200.0250.0

us-gaap:RetirementPlanType, dei:LegalEntity

us-gaap:OtherPostretirementBenefitPlansDefinedBenefit, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value443343444
Percentage of DefinedBenefitPlanServiceCost100.0100.075.0100.0133.375.0100.0100.080.0
us-gaap:PensionPlansDefinedBenefit, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value12121010101211
Percentage of DefinedBenefitPlanServiceCost300.0300.0333.3333.3250.0300.0220.0

us-gaap:StatementEquityComponents

us-gaap:DividendsCommonStockCash

us-gaap:RetainedEarnings


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value117116109108109108101101102101949394878686808080757272686867636362535353343534
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents, dei:LegalEntity

us-gaap:RetainedEarnings, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value57219196124100172139147126
Percentage of DividendsCommonStockCash48.7188.8179.8114.891.7159.3137.6145.5123.5

us-gaap:StatementEquityComponents, dei:LegalEntity

us-gaap:DividendsPreferredStockCash

us-gaap:RetainedEarnings, cms:ConsumersEnergyCompany


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-30
Value1101101
Percentage of DividendsPreferredStockCash100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate



Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-312011-03-31
Value0.00.210.00.00.210.00.210.350.350.350.350.350.350.35
Percentage of EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-312011-03-31
Value0.00.210.00.00.210.00.210.350.350.350.350.350.350.35
Percentage of EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate



Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-03-312017-09-30
Value-0.0010000000000000009-0.0390.00100000000000000090.0-0.0350.00.0290.0
Percentage of EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-03-312017-09-30
Value-0.001999999999999995-0.0340.00.0010000000000000009-0.0330.00100000000000000090.0290.0
Percentage of EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate200.087.20.0100.094.3100.0100.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities



Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-03-312017-09-302017-03-31
Value0.00.0280.00.00100000000000000090.0240.0029999999999999990.0150.00.01
Percentage of EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-03-312017-09-302017-03-31
Value0.0020.0140.0030000000000000010.0029999999999999990.010.00100000000000000090.0110.00100000000000000090.007
Percentage of EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities100.050.0100.0300.041.733.373.3100.070.0

us-gaap:EffectiveIncomeTaxRateReconciliationOtherAdjustments



Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312011-03-31
Value0.001-0.007-0.006-0.002-0.004-0.0040.003-0.01-0.011-0.018-0.005-0.0020.001
Percentage of EffectiveIncomeTaxRateReconciliationOtherAdjustments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-312011-03-31
Value-0.002-0.0030.0-0.001-0.003-0.0060.003-0.012-0.009-0.015-0.007-0.0090.0070.002
Percentage of EffectiveIncomeTaxRateReconciliationOtherAdjustments-200.042.9-0.050.075.0150.0100.0120.081.883.3140.0450.00.0200.0

us-gaap:EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes



Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-312011-03-31
Value0.00.0460.00.00.0540.00299999999999999570.0570.0470.0410.0480.0490.0490.0420.034
Percentage of EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-312011-03-31
Value0.00100000000000000090.0490.00.00100000000000000090.0560.00299999999999999570.0620.0450.0440.0470.0490.0480.0560.035
Percentage of EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes100.0106.5100.0100.0103.7100.0108.895.7107.397.9100.098.0133.3102.9

us-gaap:EffectiveIncomeTaxRateReconciliationTaxCreditsResearch



Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-03-312017-09-302017-03-31
Value-0.0120000000000000040.0340.00.00.002-0.0059999999999999980.0280.00.001
Percentage of EffectiveIncomeTaxRateReconciliationTaxCreditsResearch100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-03-312017-09-302017-03-31
Value-0.0120.0310.00.00.002-0.0060000000000000020.0270.00.001
Percentage of EffectiveIncomeTaxRateReconciliationTaxCreditsResearch100.091.2100.0100.0100.0100.096.4100.0100.0

us-gaap:StatementBusinessSegments

us-gaap:FinancingReceivableAllowanceForCreditLossesRecovery

cms:EnerBank


Period End2020-06-30
Value1
Percentage of FinancingReceivableAllowanceForCreditLossesRecovery100.0

us-gaap:StatementBusinessSegments

us-gaap:FinancingReceivableAllowanceForCreditLossesWriteOffs

cms:EnerBank


Period End2020-06-30
Value9
Percentage of FinancingReceivableAllowanceForCreditLossesWriteOffs100.0

us-gaap:ForwardContractIndexedToIssuersEquityType

us-gaap:ForwardContractIndexedToIssuersEquityForwardRate

cms:ForwardContractsEnteredIntoFebruary212019AndMaturingMarch312021


Period End2020-06-302019-02-21
Value50.8852.27
Percentage of ForwardContractIndexedToIssuersEquityForwardRate100.0100.0
cms:ForwardContractsEnteredIntoNovember202018AndMaturingMarch312021


Period End2020-06-302018-11-20
Value49.3250.91
Percentage of ForwardContractIndexedToIssuersEquityForwardRate96.90.0

us-gaap:FuelCosts



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value6310310213011914213115011513214412511714597125161134167161154219165147154190126130199153152183151138
Percentage of FuelCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeLossFromEquityMethodInvestments



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value-23452-13-143334534414434335535424323
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccountsAndOtherReceivables



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-312011-03-312010-03-31
Value-14717252-107-25161284-1-7-37-1648313103-99-9-36
Percentage of IncreaseDecreaseInAccountsAndOtherReceivables100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-312011-03-312010-03-31
Value-127-31222-43-24659204-6-5-43-3343303102-100-6-31
Percentage of IncreaseDecreaseInAccountsAndOtherReceivables86.4-182.488.140.298.096.771.8600.071.4116.2206.289.696.899.0101.066.786.1

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-31
Value77-5413-3441-8968-5-92-40-48-36105
Percentage of IncreaseDecreaseInAccountsPayableAndAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-31
Value72-5413-3539-8060-14-88-38-42-32108
Percentage of IncreaseDecreaseInAccountsPayableAndAccruedLiabilities93.5100.0100.0102.995.189.988.2280.095.795.087.588.9102.9

us-gaap:IncreaseDecreaseInTimeDeposits



Period End2020-06-302020-03-312019-06-302019-03-31
Value139-7220151
Percentage of IncreaseDecreaseInTimeDeposits100.0100.0100.0100.0

us-gaap:IncrementalCommonSharesAttributableToEquityForwardAgreements



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0100000000
Percentage of IncrementalCommonSharesAttributableToEquityForwardAgreements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value000000000000111100000011111000000
Percentage of IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestCostsCapitalizedAdjustment



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-31
Value0111111110011121111111
Percentage of InterestCostsCapitalizedAdjustment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-31
Value0111111110011121111111
Percentage of InterestCostsCapitalizedAdjustment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestExpenseOther



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value1719202019161414101110888777764353455566666208
Percentage of InterestExpenseOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value23444325454433334433232334445545196
Percentage of InterestExpenseOther11.815.820.020.021.118.814.335.740.045.540.050.037.537.542.942.957.157.150.075.066.760.066.775.060.080.080.066.783.383.366.783.395.075.0

us-gaap:InterestExpenseRelatedParty



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value333330000
Percentage of InterestExpenseRelatedParty100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value333330000
Percentage of InterestExpenseRelatedParty100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentIncomeInterestAndDividend



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302013-09-302013-06-302012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value11222132423251211111112111422545
Percentage of InvestmentIncomeInterestAndDividend100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302013-06-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value111211222222411111111211222445
Percentage of InvestmentIncomeInterestAndDividend100.0100.050.0100.050.0100.066.7100.050.0100.066.7100.080.0100.050.0100.0100.0100.0100.0100.0100.0100.0100.0100.050.0100.0100.080.0100.0100.0

us-gaap:LeaseIncome



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value353942424248
Percentage of LeaseIncome100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, cms:Enterprises


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value353942424248
Percentage of LeaseIncome100.0100.0100.0100.0100.0100.0

us-gaap:IncomeTaxAuthorityName

us-gaap:LossContingencyDamagesSoughtValue

cms:EquatorialGuineaTaxAuthority


Period End2020-06-302020-03-312019-09-302019-06-302019-03-31
Value015200152
Percentage of LossContingencyDamagesSoughtValue100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302016-06-302015-09-302014-09-30
Value-1000000.00.0-1000000.00.00.0-1000000.00.00.0-1000000.00.00.00.0-1000000.0-1000000.0-1000000.0
Percentage of OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302016-06-302015-09-302014-09-30
Value-1000000.00.0-1000000.00.00.0-1000000.00.00.0-1000000.00.00.00.0-1000000.0-1000000.0-1000000.0
Percentage of OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302013-09-30
Value0.00.00.00.00.00.0-1000000.00.00.00.00.00.00.0-1000000.0
Percentage of OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax



Period End2020-06-302020-03-312019-09-302019-06-302019-03-31
Value0.0-1000000.00.0-1000000.00.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.0-5000000.00.00.0-3000000.0-1000000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax100.0100.0100.0100.0100.0100.0

us-gaap:Range

srt:Maximum


Period End2020-06-30
Value-1000000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax100.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302016-09-302016-06-302015-09-302015-06-302015-03-312014-09-302014-06-302013-09-302013-06-302013-03-312012-09-30
Value-1000000.0-1000000.0-1000000.00.0-1000000.0-1000000.0-1000000.0-1000000.0-1000000.0-1000000.00.0-1000000.0-1000000.0-1000000.0-2000000.0-1000000.0-1000000.0-1000000.0-1000000.0-1000000.0-1000000.0-1000000.0-1000000.0
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302015-09-302015-06-302015-03-312014-09-302014-06-302013-06-302013-03-312012-09-30
Value0.00.00.00.0-1000000.00.00.0-1000000.00.0-1000000.00.0-1000000.0-1000000.0-1000000.0-1000000.0-1000000.0-1000000.0-1000000.0-1000000.0-1000000.0
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax-0.0-0.0-0.0100.0100.0-0.0-0.0100.0-0.0100.0100.0100.050.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302016-09-302016-06-302015-09-302015-06-302015-03-312014-09-302014-06-302013-09-302013-06-302013-03-312012-09-30
Value-1000000.0-1000000.0-1000000.00.0-1000000.0-1000000.0-1000000.0-1000000.0-1000000.0-1000000.00.0-1000000.0-1000000.0-1000000.0-2000000.0-1000000.0-1000000.0-1000000.0-1000000.0-1000000.0-1000000.0-1000000.0-1000000.0
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents, dei:LegalEntity

us-gaap:AccumulatedDefinedBenefitPlansAdjustment, cms:ConsumersEnergyCompany


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-30
Value0.00.00.0-1000000.00.0-1000000.00.0
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax-0.0-0.0100.0100.0-0.0100.0-0.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302015-09-302015-06-302015-03-312014-06-302013-09-302013-06-30
Value101000100010111111
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302015-06-302013-09-302013-06-30
Value0100000000000111
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax0.0100.00.0100.0100.0100.00.0100.0100.0100.00.00.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302015-09-302013-09-302012-09-30
Value00000000011-11
Percentage of OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherCostAndExpenseOperating



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value351315438313343354415366326310304315290290276293311312283329304266285304282295282295301288279273296275
Percentage of OtherCostAndExpenseOperating100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherNoncashIncomeExpense



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-31
Value-11-947207-1625-25-10-21-21-19-19
Percentage of OtherNoncashIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-31
Value40828-2-220-18-7-22-17-17-16
Percentage of OtherNoncashIncomeExpense-36.4-0.017.0140.0-28.612.580.072.070.0104.881.089.584.2

us-gaap:OtherNonoperatingExpense



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value1450533349222264334431677331132332232
Percentage of OtherNonoperatingExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value235053214322226433443463331132332232
Percentage of OtherNonoperatingExpense200.075.0100.0100.0100.0100.063.6100.033.3100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.025.085.742.9100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherNonoperatingIncome



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value2010210101202223233233223333354999
Percentage of OtherNonoperatingIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value201011100110142232312233227338358999
Percentage of OtherNonoperatingIncome100.0100.0100.0100.050.0100.0100.00.0100.0100.050.0100.0700.0100.0100.0100.0100.0100.0400.0100.0100.0100.0100.0100.0233.3100.0100.0266.7100.0100.0200.0100.0100.0100.0

us-gaap:PaymentsForProceedsFromOtherInvestingActivities



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-312011-03-312010-03-31
Value352429562027444629142835281012201
Percentage of PaymentsForProceedsFromOtherInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-312011-03-312010-03-31
Value352229373726534130212728-11311251
Percentage of PaymentsForProceedsFromOtherInvestingActivities100.091.7100.066.1185.096.3120.589.1103.4150.096.480.0-3.6130.091.7125.0100.0

us-gaap:PaymentsOfOrdinaryDividends



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value118116110108110108102101103101
Percentage of PaymentsOfOrdinaryDividends100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value58219197124101172140147127119
Percentage of PaymentsOfOrdinaryDividends49.2188.8179.1114.891.8159.3137.3145.5123.3117.8

us-gaap:PaymentsToAcquireLoansReceivable



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value1444731581244610712075551
Percentage of PaymentsToAcquireLoansReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsToAcquireNotesReceivable



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value7836879912113878000-25
Percentage of PaymentsToAcquireNotesReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PensionAndOtherPostretirementBenefitContributions



Period End2020-06-302020-03-312019-06-302019-03-312015-03-312014-03-312013-03-312012-03-312011-03-312010-03-31
Value053100312681919135
Percentage of PensionAndOtherPostretirementBenefitContributions100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-06-302019-03-312015-03-312014-03-312013-03-312012-03-312011-03-312010-03-31
Value051800301671819125
Percentage of PensionAndOtherPostretirementBenefitContributions100.097.6100.0100.096.850.098.594.7100.092.6

dei:LegalEntity

us-gaap:PreferredStockDividendsAndOtherAdjustments

cms:ConsumersEnergyCompany


Period End2020-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-06-302015-12-312015-06-302014-12-312014-06-302013-09-302013-06-302012-09-302012-06-30
Value11010101010101111111111
Percentage of PreferredStockDividendsAndOtherAdjustments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

us-gaap:ProceedsFromContributedCapital

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-312011-03-312010-03-31
Value3003500032535000100250150150150150150125200
Percentage of ProceedsFromContributedCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromIssuanceOfCommonStock



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-31
Value31013333233363433241
Percentage of ProceedsFromIssuanceOfCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SubsidiarySaleOfStock

cms:SettlementOfForwardContracts


Period End2020-03-31
Value97
Percentage of ProceedsFromIssuanceOfCommonStock96.0

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-31
Value-32000000.0-22000000.0-11000000.0-10000000.03000000.0-32000000.0-2000000.0-16000000.0-22000000.0-24000000.0-12000000.0-16000000.0-10000000.0-10000000.0
Percentage of ProceedsFromPaymentsForOtherFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-03-312017-03-312016-03-312015-03-312014-03-312013-03-31
Value-25000000.0-10000000.01000000.0-9000000.03000000.0-5000000.04000000.0-7000000.0-6000000.0-9000000.0-1000000.0-6000000.0-5000000.0-5000000.0
Percentage of ProceedsFromPaymentsForOtherFinancingActivities78.145.5-9.190.0100.015.6-200.043.827.337.58.337.550.050.0

us-gaap:ProvisionForDoubtfulAccounts



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value854696632877
Percentage of ProvisionForDoubtfulAccounts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

us-gaap:ProvisionForLoanLossesExpensed

cms:EnerBank


Period End2020-06-30
Value13
Percentage of ProvisionForLoanLossesExpensed100.0

us-gaap:PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value2132322211122333322222113222121121
Percentage of PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value2132322211122333322222113222121121
Percentage of PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity, us-gaap:PublicUtilitiesRegulatoryProceeding, us-gaap:StatementScenario

us-gaap:PublicUtilitiesApprovedRateIncreaseDecreaseAmount

cms:ConsumersEnergyCompany, cms:GasRateCase, us-gaap:ScenarioForecast


Period End2020-07-312019-07-31
Value109
Percentage of PublicUtilitiesApprovedRateIncreaseDecreaseAmount100.0100.0

us-gaap:RepaymentsOfShortTermDebt



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-30
Value090-9003067017060-230
Percentage of RepaymentsOfShortTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-06-302018-03-312017-12-312017-09-30
Value090-9003067017060-230
Percentage of RepaymentsOfShortTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestructuringCostAndReserve, us-gaap:RestructuringPlan

us-gaap:RestructuringCharges

cms:RetentionBenefits, cms:D.E.KarnGeneratingComplex


Period End2020-06-302020-03-31
Value34
Percentage of RestructuringCharges100.0100.0

us-gaap:StatementEquityComponents

us-gaap:StockRepurchasedDuringPeriodValue

us-gaap:AdditionalPaidInCapital


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-03-312015-03-312014-09-302014-03-312013-09-302013-06-302012-09-302011-09-302011-06-302010-09-302010-06-30
Value112110800010011211011169-19-60-1-1
Percentage of StockRepurchasedDuringPeriodValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TaxesExcludingIncomeAndExciseTaxes



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value7511486707110681676887626681626087596081575675545070534869335167494166
Percentage of TaxesExcludingIncomeAndExciseTaxes100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

us-gaap:UtilitiesOperatingExpense

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value108414151362111011591615148112311166152113231129
Percentage of UtilitiesOperatingExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

us-gaap:UtilitiesOperatingExpenseDepreciationAndAmortization

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value218312259210212294240203201277226191
Percentage of UtilitiesOperatingExpenseDepreciationAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

us-gaap:UtilitiesOperatingExpenseFuelUsed

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value43798010188106971228610294115
Percentage of UtilitiesOperatingExpenseFuelUsed100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

us-gaap:UtilitiesOperatingExpenseGasAndPetroleumPurchased

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value80270217321044012894510837725142
Percentage of UtilitiesOperatingExpenseGasAndPetroleumPurchased100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

us-gaap:UtilitiesOperatingExpenseMaintenanceAndOperations

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value302278364272320319373334298282289274
Percentage of UtilitiesOperatingExpenseMaintenanceAndOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

us-gaap:UtilitiesOperatingExpensePurchasedPower

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value354347338408350374381440388378424369331445360343389337346382348484374340329379327313362299293359310277
Percentage of UtilitiesOperatingExpensePurchasedPower100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

us-gaap:UtilitiesOperatingExpenseTaxes

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value73111826869103796566857360
Percentage of UtilitiesOperatingExpenseTaxes100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:VariableLeaseIncome

us-gaap:OperatingSegments, cms:Enterprises


Period End2020-06-302020-03-312019-06-302019-03-31
Value21252934
Percentage of VariableLeaseIncome100.0100.0100.0100.0

us-gaap:WeightedAverageNumberOfSharesIssuedBasic



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value28528302832822820282282281280279278278278276276275274274268266264264263262261255251250250229228
Percentage of WeightedAverageNumberOfSharesIssuedBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cms:AccruedRateRefunds



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value4442351834254144546333577732133413426202723612
Percentage of AccruedRateRefunds100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value4442351834254144546333577732133413426202723612
Percentage of AccruedRateRefunds100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cms:AssetsNoncurrentOtherThanPropertyPlantAndEquipment



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value5613548655805180493241023935374937893757381435553537355136273201324532403315316931723176
Percentage of AssetsNoncurrentOtherThanPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value3211321532572905291023022284232223722415249422642287233524012006206620802141207221352237
Percentage of AssetsNoncurrentOtherThanPropertyPlantAndEquipment57.258.658.456.159.056.158.061.962.664.365.463.764.765.866.262.763.764.264.665.467.370.4

cms:DebtInstrumentSupportedByThirdPartyCreditEnhancement



Period End2020-06-302020-03-312019-12-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value353535353535103103103103103103103103103103103103103103103103103103103103103103103103103103103103
Percentage of DebtInstrumentSupportedByThirdPartyCreditEnhancement100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value353535353535353535103103103103103103103103103103103103103103103103103103103103103103103103103103103103103
Percentage of DebtInstrumentSupportedByThirdPartyCreditEnhancement100.0100.0100.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0

cms:DeferredPropertyTaxes



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value223246305184204226279167187207257157179203250152174193235141159178216202
Percentage of DeferredPropertyTaxes100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value223246305184204226279167187207257157179203250152174193235141159178216202
Percentage of DeferredPropertyTaxes100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cms:FinanceLeaseLiabilityAndOtherNoncurrent



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value67717681869169
Percentage of FinanceLeaseLiabilityAndOtherNoncurrent100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value67717681869169
Percentage of FinanceLeaseLiabilityAndOtherNoncurrent100.0100.0100.0100.0100.0100.0100.0

cms:LongTermDebtCurrentMaturitiesLeaseObligationAndOtherFinancingCurrent



Period End2020-06-302020-03-312019-12-31
Value174417211130
Percentage of LongTermDebtCurrentMaturitiesLeaseObligationAndOtherFinancingCurrent100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-31
Value556521221
Percentage of LongTermDebtCurrentMaturitiesLeaseObligationAndOtherFinancingCurrent31.930.319.6

us-gaap:FairValueByFairValueHierarchyLevel

cms:NonqualifiedDeferredCompensationPlanAssetsFairValueDisclosure

us-gaap:FairValueInputsLevel1


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value19171817161514665554
Percentage of NonqualifiedDeferredCompensationPlanAssetsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, dei:LegalEntity

us-gaap:FairValueInputsLevel1, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value151314131210
Percentage of NonqualifiedDeferredCompensationPlanAssetsFairValueDisclosure78.976.577.876.575.071.4

us-gaap:FairValueByFairValueHierarchyLevel

cms:NonqualifiedDeferredCompensationPlanLiabilitiesFairValueDisclosure

us-gaap:FairValueInputsLevel1


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value19171817161514665555554446
Percentage of NonqualifiedDeferredCompensationPlanLiabilitiesFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, dei:LegalEntity

us-gaap:FairValueInputsLevel1, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value151314131210
Percentage of NonqualifiedDeferredCompensationPlanLiabilitiesFairValueDisclosure78.976.577.876.575.071.4

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

cms:NotesReceivableRelatedPartiesFairValueDisclosure

us-gaap:FairValueInputsLevel3, us-gaap:EstimateOfFairValueFairValueDisclosure, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value103103103104105106
Percentage of NotesReceivableRelatedPartiesFairValueDisclosure100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementBasis, dei:LegalEntity

us-gaap:CarryingReportedAmountFairValueDisclosure, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value103103103104105106
Percentage of NotesReceivableRelatedPartiesFairValueDisclosure100.0100.0100.0100.0100.0100.0
us-gaap:EstimateOfFairValueFairValueDisclosure, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value103103103104105106
Percentage of NotesReceivableRelatedPartiesFairValueDisclosure100.0100.0100.0100.0100.0100.0

cms:PropertyPlantAndEquipmentGrossExcludingCWIP



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-312012-12-31
Value25911256752539024645242632472924400237512325822878225062196621628212652101020698204971933418943185471821717930177211618415592
Percentage of PropertyPlantAndEquipmentGrossExcludingCWIP100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

cms:CorporateAndReconcilingItems


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value2021204544424240403830
Percentage of PropertyPlantAndEquipmentGrossExcludingCWIP0.10.10.10.20.20.20.20.20.20.20.1

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, cms:ElectricUtility


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value1644716338161581581215660161961602715772156461522114540
Percentage of PropertyPlantAndEquipmentGrossExcludingCWIP63.563.663.664.264.565.565.766.467.367.669.2
us-gaap:OperatingSegments, cms:EnerBank


Period End2020-06-302020-03-312019-12-312018-12-312017-12-31
Value3522222521
Percentage of PropertyPlantAndEquipmentGrossExcludingCWIP0.10.10.10.10.1
us-gaap:OperatingSegments, cms:Enterprises


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value408407405406405404412405175167157
Percentage of PropertyPlantAndEquipmentGrossExcludingCWIP1.61.61.61.61.71.61.71.70.80.70.7
us-gaap:OperatingSegments, cms:GasUtility


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value90018887878583828154808779197534739770806283
Percentage of PropertyPlantAndEquipmentGrossExcludingCWIP34.734.634.634.033.632.732.531.731.831.529.9

cms:PropertyPlantAndEquipmentNetExcludingCWIP



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value182141811218030173811713317493173631684216450161961599615563153171505914954147451457513456131961285012584123851230611097
Percentage of PropertyPlantAndEquipmentNetExcludingCWIP100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:PublicUtilitiesPropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312018-12-31
Value19079187881857017761
Percentage of PublicUtilitiesPropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization100.0100.0100.0100.0

dei:LegalEntity

cms:PublicUtilitiesPropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortizationAndConstructionWorkInProgress

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312018-12-312017-12-31
Value2546825246249632396322318
Percentage of PublicUtilitiesPropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortizationAndConstructionWorkInProgress100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, dei:LegalEntity

cms:CorporateAndReconcilingItems, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312018-12-312017-12-31
Value2021201717
Percentage of PublicUtilitiesPropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortizationAndConstructionWorkInProgress0.10.10.10.10.1

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

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


Period End2020-06-302020-03-312019-12-312018-12-312017-12-31
Value1644716338161581602715221
Percentage of PublicUtilitiesPropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortizationAndConstructionWorkInProgress64.664.764.766.968.2
us-gaap:OperatingSegments, cms:GasUtility, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312018-12-312017-12-31
Value90018887878579197080
Percentage of PublicUtilitiesPropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortizationAndConstructionWorkInProgress35.335.235.233.031.7

dei:LegalEntity

cms:PublicUtilitiesPropertyPlantAndEquipmentNetExcludingCWIP

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312013-12-31
Value178681777517691170391678717144170051648816323160801587715449152051494914844146351446313344131211277412510123111223411022
Percentage of PublicUtilitiesPropertyPlantAndEquipmentNetExcludingCWIP100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:PublicUtilitiesPropertyPlantandEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312018-12-31
Value7600747172726958
Percentage of PublicUtilitiesPropertyPlantandEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization100.0100.0100.0100.0

dei:EntityCommonStockSharesOutstanding



Period End2020-07-072020-04-062020-01-102019-10-072019-07-092019-04-082019-01-142018-10-092018-07-11
Value286286283283283283283283283
Percentage of EntityCommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

us-gaap:AccountsReceivableFairValueDisclosure

us-gaap:FairValueInputsLevel3, us-gaap:EstimateOfFairValueFairValueDisclosure


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value1919202120212222212021222018222321
Percentage of AccountsReceivableFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

us-gaap:FairValueInputsLevel3, us-gaap:EstimateOfFairValueFairValueDisclosure, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value191920212022
Percentage of AccountsReceivableFairValueDisclosure100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value1919202120212222212021222018222321
Percentage of AccountsReceivableFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
us-gaap:EstimateOfFairValueFairValueDisclosure


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value1919202120212222212021222018222321
Percentage of AccountsReceivableFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementBasis, dei:LegalEntity

us-gaap:CarryingReportedAmountFairValueDisclosure, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value191920212022
Percentage of AccountsReceivableFairValueDisclosure100.0100.0100.0100.0100.0100.0
us-gaap:EstimateOfFairValueFairValueDisclosure, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value191920212022
Percentage of AccountsReceivableFairValueDisclosure100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByAssetClass

us-gaap:AccountsReceivableGrossCurrent

cms:OtherReceivables


Period End2020-06-302020-03-312019-12-31
Value121313
Percentage of AccountsReceivableGrossCurrent100.0100.0100.0

us-gaap:FairValueByAssetClass, dei:LegalEntity

cms:OtherReceivables, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value121313141414
Percentage of AccountsReceivableGrossCurrent100.0100.0100.00.00.00.0

us-gaap:EnvironmentalRemediationSite

us-gaap:AccrualForEnvironmentalLossContingencies

cms:BayHarbor


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value454646444545464647484849505151525354585960616263505152
Percentage of AccrualForEnvironmentalLossContingencies100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

cms:ManufacturedGasPlant, cms:GasUtility, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-09-302019-06-30
Value63677068
Percentage of AccrualForEnvironmentalLossContingencies140.0145.7159.1151.1

us-gaap:Range, us-gaap:EnvironmentalRemediationSite, us-gaap:PublicUtility, dei:LegalEntity

srt:Maximum, cms:Nrepa, cms:GasUtility, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-30
Value11311
Percentage of AccrualForEnvironmentalLossContingencies2.22.26.52.32.2

us-gaap:EnvironmentalRemediationSite

us-gaap:AccrualForEnvironmentalLossContingenciesGross

cms:BayHarbor


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value565758565657585858596162636465676869747577788082686971
Percentage of AccrualForEnvironmentalLossContingenciesGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

cms:ManufacturedGasPlant, cms:GasUtility, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-09-302019-06-30
Value67727274
Percentage of AccrualForEnvironmentalLossContingenciesGross119.6126.3128.6132.1

us-gaap:EnvironmentalRemediationSite

us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueInFifthYear

cms:BayHarbor


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value4444444444444444444555554
Percentage of AccrualForEnvironmentalLossContingenciesUndiscountedDueInFifthYear100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

cms:ManufacturedGasPlant, cms:GasUtility, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-09-302019-06-30
Value22112
Percentage of AccrualForEnvironmentalLossContingenciesUndiscountedDueInFifthYear50.050.0275.050.0

us-gaap:EnvironmentalRemediationSite

us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueInFourthYear

cms:BayHarbor


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value4444444444444444445555554
Percentage of AccrualForEnvironmentalLossContingenciesUndiscountedDueInFourthYear100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

cms:ManufacturedGasPlant, cms:GasUtility, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-09-302019-06-30
Value211207
Percentage of AccrualForEnvironmentalLossContingenciesUndiscountedDueInFourthYear50.0275.0500.0175.0

us-gaap:EnvironmentalRemediationSite

us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueInRemainderOfFiscalYear

cms:BayHarbor


Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-30
Value342231231345667778
Percentage of AccrualForEnvironmentalLossContingenciesUndiscountedDueInRemainderOfFiscalYear100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

cms:ManufacturedGasPlant, cms:GasUtility, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-09-302019-06-30
Value71238
Percentage of AccrualForEnvironmentalLossContingenciesUndiscountedDueInRemainderOfFiscalYear233.3300.0150.0400.0

us-gaap:EnvironmentalRemediationSite

us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueInSecondYear

cms:BayHarbor


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value4445444444444445555666665
Percentage of AccrualForEnvironmentalLossContingenciesUndiscountedDueInSecondYear100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

cms:ManufacturedGasPlant, cms:GasUtility, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-09-302019-06-30
Value2081316
Percentage of AccrualForEnvironmentalLossContingenciesUndiscountedDueInSecondYear500.0200.0260.0400.0

us-gaap:EnvironmentalRemediationSite

us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueInThirdYear

cms:BayHarbor


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value4444444444444444445555565
Percentage of AccrualForEnvironmentalLossContingenciesUndiscountedDueInThirdYear100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

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

cms:ManufacturedGasPlant, cms:GasUtility, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-09-302019-06-30
Value11201221
Percentage of AccrualForEnvironmentalLossContingenciesUndiscountedDueInThirdYear275.0500.0300.0525.0

us-gaap:EnvironmentalRemediationSite

us-gaap:AccrualForEnvironmentalLossContingenciesUndiscountedDueWithinOneYear

cms:BayHarbor


Period End2020-06-302019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value45455686
Percentage of AccrualForEnvironmentalLossContingenciesUndiscountedDueWithinOneYear100.0100.0100.0100.0100.0100.0100.0100.0

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

cms:ManufacturedGasPlant, cms:GasUtility, cms:ConsumersEnergyCompany


Period End2020-06-30
Value8
Percentage of AccrualForEnvironmentalLossContingenciesUndiscountedDueWithinOneYear200.0

us-gaap:AccumulatedDeferredInvestmentTaxCredit



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value118119120116117989910110286878889727374735556565758373839394041414243444445464747484951
Percentage of AccumulatedDeferredInvestmentTaxCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value1181191201161179899101102868788897273747355565657583738393940414142434444454647474849
Percentage of AccumulatedDeferredInvestmentTaxCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value33222021202020202019202222242427272928333737403636333331313132303535352525252523
Percentage of AllowanceForDoubtfulAccountsReceivableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value332220212020202020192022222424272729283336363934343131292929302833333323232323
Percentage of AllowanceForDoubtfulAccountsReceivableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.097.397.397.594.494.493.993.993.593.593.593.893.394.394.394.392.092.092.092.0

us-gaap:AllowanceForNotesAndLoansReceivableCurrent



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302014-12-31
Value353333332826242323212019181716121010998
Percentage of AllowanceForNotesAndLoansReceivableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForNotesAndLoansReceivableNoncurrent



Period End2020-06-302020-03-312019-12-312015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value6966088865555555555555556
Percentage of AllowanceForNotesAndLoansReceivableNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetRetirementObligationsNoncurrent



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value483485477451438433432421426427430443452451447445442440439419348344340330329328325322319316312264261257254254252249245229
Percentage of AssetRetirementObligationsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value480482474448435430428417425426429442451450446444441439438418347343339329328327324321318315311263260257253253251248244
Percentage of AssetRetirementObligationsNoncurrent99.499.499.499.399.399.399.199.099.899.899.899.899.899.899.899.899.899.899.899.899.799.799.799.799.799.799.799.799.799.799.799.699.6100.099.699.699.699.699.6

us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:AssetsFairValueDisclosure

us-gaap:FairValueInputsLevel12And3


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value1391353649586864
Percentage of AssetsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, dei:LegalEntity

us-gaap:FairValueInputsLevel12And3, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value1333833413129
Percentage of AssetsFairValueDisclosure95.728.191.783.753.445.3

us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:CashAndCashEquivalentsFairValueDisclosure

us-gaap:FairValueInputsLevel1


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value1009100182027871003394855360141271109512875183
Percentage of CashAndCashEquivalentsFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, dei:LegalEntity

us-gaap:FairValueInputsLevel1, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value10000000
Percentage of CashAndCashEquivalentsFairValueDisclosure100.00.0100.0100.00.00.0

us-gaap:ConstructionInProgressGross



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value122210328961143973822763948787708765881802798761698612145115091310119111411106121113391206114994311081135108011341011899783672644627570506
Percentage of ConstructionInProgressGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentFaceAmount



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312017-09-302016-12-312016-09-302015-12-312011-12-312010-12-31
Value23341175209620211395930248010007501410885102575050070937206
Percentage of DebtInstrumentFaceAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CreditFacility, us-gaap:DebtInstrument, dei:LegalEntity

us-gaap:DebtInstrumentInterestRateEffectivePercentage

cms:TermLoanFacilityDueJanuary2021, cms:TermLoanFacility, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-31
Value0.005560.01466
Percentage of DebtInstrumentInterestRateEffectivePercentage100.0100.0

us-gaap:DebtInstrument, dei:LegalEntity

cms:FirstMortgageBondsDueMay2070, cms:ConsumersEnergyCompany


Period End2020-06-30
Value0.00077
Percentage of DebtInstrumentInterestRateEffectivePercentage13.8

us-gaap:DeferredIncomeTaxLiabilitiesNet



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value1763172216551588154815441487138213441269
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value1958192318641858185118401809171116891640
Percentage of DeferredIncomeTaxLiabilitiesNet111.1111.7112.6117.0119.6119.2121.7123.8125.7129.2

us-gaap:DerivativeFairValueOfDerivativeAsset



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value301221
Percentage of DerivativeFairValueOfDerivativeAsset100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value301221
Percentage of DerivativeFairValueOfDerivativeAsset100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeFairValueOfDerivativeLiability



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value2119811113
Percentage of DerivativeFairValueOfDerivativeLiability100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value100110
Percentage of DerivativeFairValueOfDerivativeLiability4.80.00.09.19.10.0

us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation

us-gaap:OtherLiabilities, us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value10105663
Percentage of DerivativeFairValueOfDerivativeLiability47.652.662.554.554.5100.0

us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, us-gaap:StatementBusinessSegments

us-gaap:OtherLiabilities, us-gaap:FairValueHedging, us-gaap:DesignatedAsHedgingInstrument, cms:EnerBank


Period End2020-06-302020-03-312019-12-31
Value771
Percentage of DerivativeFairValueOfDerivativeLiability33.336.812.5

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

us-gaap:DerivativeNotionalAmount

us-gaap:InterestRateSwap, us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument


Period End2020-06-302020-03-312019-12-312019-09-302019-06-30
Value8890929495
Percentage of DerivativeNotionalAmount100.0100.0100.0100.0100.0

us-gaap:DueFromRelatedPartiesCurrent



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value2025171615141415141312121212121212111112121111111110101010101011101010101011100
Percentage of DueFromRelatedPartiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value88988915812222292111711111114112111112111
Percentage of DueFromRelatedPartiesCurrent40.032.052.950.053.364.3107.153.37.115.416.716.716.716.775.016.78.39.1154.58.38.39.19.19.19.110.040.010.010.020.010.09.110.010.010.020.010.09.110.0

dei:LegalEntity

us-gaap:DueFromRelatedPartiesNoncurrent

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value1011021021021031041040
Percentage of DueFromRelatedPartiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DueToRelatedPartiesCurrent



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value6713996109661589912999986910910101079109998998890
Percentage of DueToRelatedPartiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1316201416111413111019121513189151515111114121114161310131411111211111211111111
Percentage of DueToRelatedPartiesCurrent216.7228.6153.8155.6177.8183.3140.0144.4183.3166.7126.7150.0166.7144.4150.0100.0166.7166.7166.7137.5183.3155.6120.0122.2140.0160.0130.0142.9144.4140.0122.2122.2133.3137.5122.2133.3137.5137.5122.2100.0

us-gaap:EnergyRelatedInventoryGasStoredUnderground



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value28522539950535325645055136724445858439524344655337731456865245932868183358234066083056838982098676061092910507204809461043
Percentage of EnergyRelatedInventoryGasStoredUnderground100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value2852253995053532564505513672444585843952434465533773145686524593286818335823406538245683898169827566079291050720480941
Percentage of EnergyRelatedInventoryGasStoredUnderground100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.098.999.3100.0100.099.599.699.599.5100.0100.0100.0100.099.5

us-gaap:EnergyRelatedInventoryOtherFossilFuel



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value716666525238575060658177666461647764849210697120968485114152159149168187196182166127143126125158
Percentage of EnergyRelatedInventoryOtherFossilFuel100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value686463494837524458627673636357607463808710094112898284113152159148167186196180164125141126124
Percentage of EnergyRelatedInventoryOtherFossilFuel95.897.095.594.292.397.491.288.096.795.493.894.895.598.493.493.896.198.495.294.694.396.993.392.797.698.899.1100.0100.099.399.499.5100.098.998.898.498.6100.099.2

us-gaap:EquityMethodInvestments



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value6872716864626972746764716866656866646461616261616261595750499
Percentage of EquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableAllowanceForCreditLosses



Period End2020-03-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value9933242016985555555555555
Percentage of FinancingReceivableAllowanceForCreditLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CumulativeEffectPeriodOfAdoption, us-gaap:StatementBusinessSegments

srt:CumulativeEffectPeriodOfAdoptionAdjustment, cms:EnerBank


Period End2020-03-312019-12-31
Value062
Percentage of FinancingReceivableAllowanceForCreditLosses0.0187.9

us-gaap:StatementBusinessSegments

cms:EnerBank


Period End2020-06-302020-03-312019-12-31
Value1049933
Percentage of FinancingReceivableAllowanceForCreditLosses0.0100.0100.0

us-gaap:StatementBusinessSegments

us-gaap:FinancingReceivableRecordedInvestmentPastDue

cms:EnerBank


Period End2020-06-302020-03-312019-12-312018-12-31
Value23313321
Percentage of FinancingReceivableRecordedInvestmentPastDue100.0100.0100.0100.0

us-gaap:GuaranteeObligationsByNature

us-gaap:GuaranteeObligationsCurrentCarryingValue

us-gaap:GuaranteeTypeOther


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value000000000111111111
Percentage of GuaranteeObligationsCurrentCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LossContingenciesByNatureOfContingency

us-gaap:IndemnificationGuarantee


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value22222233377777777778777716161616151515151616172121
Percentage of GuaranteeObligationsCurrentCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.01500.01500.01500.01500.01600.01600.01700.02100.02100.0

us-gaap:GuaranteeObligationsByNature

us-gaap:GuaranteeObligationsMaximumExposure

us-gaap:GuaranteeTypeOther


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value30303636363639393942454545454848484951515151545454545757575760606060636333
Percentage of GuaranteeObligationsMaximumExposure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LossContingenciesByNatureOfContingency

us-gaap:IndemnificationGuarantee


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value153153153153153153153153153153153153153153153153153153143143148148150450469469471476482482512512512512512512512
Percentage of GuaranteeObligationsMaximumExposure510.0510.0425.0425.0425.0425.0392.3392.3392.3364.3340.0340.0340.0340.0318.8318.8318.8312.2280.4280.4290.2290.2277.8833.3868.5868.5826.3835.1845.6845.6853.3853.3853.3853.3812.7812.71551.5

us-gaap:HeldToMaturitySecurities



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-312015-12-312014-12-312014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value292826242622222219161311111211101010998887775
Percentage of HeldToMaturitySecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value0001000000
Percentage of HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value0.00.00.00.00.00.01000000.01000000.00.00.0
Percentage of HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:HeldToMaturitySecuritiesFairValue



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-312015-12-312015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value29282625262221211916131112111112111010109109997876
Percentage of HeldToMaturitySecuritiesFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value29282625262221211917161613121314131311121311
Percentage of HeldToMaturitySecuritiesFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.00.00.0100.00.00.00.0100.00.00.0100.0

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value29282624262222221917161613121313131311121312111110
Percentage of HeldToMaturitySecuritiesFairValue100.0100.0100.096.0100.0100.0104.8104.8100.00.0100.00.00.00.0100.00.00.00.0100.00.00.0100.0100.0100.0100.0
us-gaap:EstimateOfFairValueFairValueDisclosure


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value29282625262221211917161613121314131311121311
Percentage of HeldToMaturitySecuritiesFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.00.00.0100.00.00.00.0100.00.00.0100.0

us-gaap:InterestAndDividendsPayableCurrent



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value10910010499951099483102771037910473987610772106641036710865103679665936895649666101701077510296
Percentage of InterestAndDividendsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-31
Value707867765879595865506748674767486547654464477045634363435937653465397341754174
Percentage of InterestAndDividendsPayableCurrent64.278.064.476.861.172.562.869.963.764.965.060.864.464.468.463.260.765.361.368.862.170.164.869.261.264.265.666.263.454.468.453.167.759.172.358.670.154.772.5

us-gaap:ConsolidatedEntities, us-gaap:LineOfCreditFacility

us-gaap:LettersOfCreditOutstandingAmount

srt:ParentCompany, cms:RevolvingCreditFacilitiesTwo


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value54632419
Percentage of LettersOfCreditOutstandingAmount100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LineOfCreditFacility, dei:LegalEntity

cms:RevolvingCreditFacilitiesOne, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-30
Value18102515
Percentage of LettersOfCreditOutstandingAmount20.0200.0166.7833.3750.0

us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:LiabilitiesFairValueDisclosure

us-gaap:FairValueInputsLevel12And3


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value40362628271917
Percentage of LiabilitiesFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, dei:LegalEntity

us-gaap:FairValueInputsLevel12And3, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value161314141310
Percentage of LiabilitiesFairValueDisclosure40.036.153.850.048.158.8

us-gaap:ConsolidatedEntities, us-gaap:LineOfCreditFacility

us-gaap:LineOfCredit

srt:ParentCompany, cms:RevolvingCreditFacilitiesTwo


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value0250000300
Percentage of LineOfCredit100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidatedEntities, us-gaap:LineOfCreditFacility

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity

srt:ParentCompany, cms:RevolvingCreditFacilitiesTwo


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value545521544547548546519541
Percentage of LineOfCreditFacilityRemainingBorrowingCapacity100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LineOfCreditFacility, dei:LegalEntity

cms:RevolvingCreditFacilitiesOne, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-30
Value249242240225235
Percentage of LineOfCreditFacilityRemainingBorrowingCapacity45.746.444.141.142.9

us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:StatementBusinessSegments

us-gaap:LoansAndLeasesReceivableDeferredIncome

cms:ReceivablesExcludingHeldForSale, cms:EnerBank


Period End2020-03-312019-12-31
Value130134
Percentage of LoansAndLeasesReceivableDeferredIncome100.0100.0

us-gaap:StatementBusinessSegments

cms:EnerBank


Period End2020-06-302019-12-312018-12-31
Value131134102
Percentage of LoansAndLeasesReceivableDeferredIncome0.0100.00.0

us-gaap:LoansReceivableHeldForSaleAmount



Period End2020-03-312019-12-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-03-312014-12-31
Value0190260223118193941151616174941
Percentage of LoansReceivableHeldForSaleAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LongTermAccountsNotesAndLoansReceivableNetNoncurrent



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value2353222622812253200517911645139312461183118711771125109211181110109810341027950884823807759687646646556504508521462
Percentage of LongTermAccountsNotesAndLoansReceivableNetNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value26292929292927222122224528252756541010977774211171114171
Percentage of LongTermAccountsNotesAndLoansReceivableNetNoncurrent1.11.31.31.31.41.61.61.61.71.91.93.82.52.32.45.04.91.01.00.90.80.90.90.90.60.31.73.12.22.83.30.2

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

us-gaap:LongTermDebtFairValue

us-gaap:FairValueInputsLevel1, us-gaap:EstimateOfFairValueFairValueDisclosure


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-31
Value1150111311971245117711474594451990
Percentage of LongTermDebtFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value142901226911048111631005394189404908890538971936393319463936789909628932488568648821180888252
Percentage of LongTermDebtFairValue1242.61102.3923.0896.6854.1821.12048.82042.24549.20.0100.00.00.00.00.00.00.00.00.00.00.00.0
us-gaap:FairValueInputsLevel3, us-gaap:EstimateOfFairValueFairValueDisclosure


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value17141971194019631882183917671265128713021352115397297896310231070985951101810021033
Percentage of LongTermDebtFairValue149.0177.1162.1157.7159.9160.3385.0284.3646.70.0100.00.00.00.00.00.00.00.00.00.00.00.0

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

us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value819869686070607252205066
Percentage of LongTermDebtFairValue712.9626.1507.1487.7443.51103.7
us-gaap:FairValueInputsLevel3, us-gaap:EstimateOfFairValueFairValueDisclosure, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value171419711940196318821767
Percentage of LongTermDebtFairValue149.0177.1162.1157.7159.9385.0

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value151391424713062130941229211926115891081710466102611020499839910991995049706938390999125862385388664853587117642
Percentage of LongTermDebtFairValue1316.41280.11091.21051.71044.41039.82524.82430.85259.30.0100.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
us-gaap:EstimateOfFairValueFairValueDisclosure


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-31
Value17154153531418514371131121240411630107981053910273107151048410435103459953106511039498419599922990909285
Percentage of LongTermDebtFairValue1491.71379.41185.01154.31114.01081.42533.82426.55296.00.0100.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:FairValueByMeasurementBasis, dei:LegalEntity

us-gaap:CarryingReportedAmountFairValueDisclosure, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value840481187250718965726805
Percentage of LongTermDebtFairValue730.8729.4605.7577.4558.41482.6
us-gaap:EstimateOfFairValueFairValueDisclosure, cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value991289398010803571026833
Percentage of LongTermDebtFairValue861.9803.1669.2645.4603.41488.7

us-gaap:NotesAndLoansReceivableNetCurrent



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value26424122323424925023323720620119819719318618014614213512811911410398968869638476734128402549625770
Percentage of NotesAndLoansReceivableNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType, us-gaap:StatementBusinessSegments

cms:ReceivablesExcludingHeldForSale, cms:EnerBank


Period End2020-03-312019-12-312018-12-31
Value241223233
Percentage of NotesAndLoansReceivableNetCurrent100.0100.0100.0
cms:ReceivablesHeldForSale, cms:EnerBank


Period End2020-03-312019-12-312018-12-31
Value0190
Percentage of NotesAndLoansReceivableNetCurrent0.08.50.0

us-gaap:StatementBusinessSegments

cms:EnerBank


Period End2020-06-302020-03-312019-12-312018-12-31
Value264241242233
Percentage of NotesAndLoansReceivableNetCurrent100.0100.0108.5100.0

us-gaap:StatementBusinessSegments

us-gaap:NotesAndLoansReceivableNetNoncurrent

cms:EnerBank


Period End2020-06-302020-03-312019-12-312018-12-31
Value2333220322581624
Percentage of NotesAndLoansReceivableNetNoncurrent100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

us-gaap:NotesPayableFairValueDisclosure

us-gaap:FairValueInputsLevel3, us-gaap:EstimateOfFairValueFairValueDisclosure


Period End2020-06-302020-03-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value32303227261714
Percentage of NotesPayableFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure


Period End2020-06-302020-03-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value31313027271714
Percentage of NotesPayableFairValueDisclosure96.9103.393.8100.0103.8100.0100.0
us-gaap:EstimateOfFairValueFairValueDisclosure


Period End2020-06-302020-03-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value32303227261714
Percentage of NotesPayableFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis

us-gaap:NotesReceivableFairValueDisclosure

us-gaap:FairValueInputsLevel3, us-gaap:EstimateOfFairValueFairValueDisclosure


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value289627212652261923592126196717301522145314641479141113731415137413361228
Percentage of NotesReceivableFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value259724442500246422312018185716401437137013711382132512881326128612451161
Percentage of NotesReceivableFairValueDisclosure89.789.894.394.194.694.994.494.894.494.393.693.493.993.893.793.693.294.5
us-gaap:EstimateOfFairValueFairValueDisclosure


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value289627212652261923592126196717301522145314641479141113731415137413361228
Percentage of NotesReceivableFairValueDisclosure100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NotesReceivableNet



Period End2020-06-302020-03-312019-12-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-312011-12-312011-09-302011-06-302010-12-31
Value25972444250018571640143713701371138213251288132612861245117511611077991968939848771713698561480439398386
Percentage of NotesReceivableNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302013-12-312012-12-31
Value1031031031041051051061241717174646454545441416
Percentage of NotesReceivableNet4.04.24.10.00.00.05.77.61.21.21.23.33.53.53.43.53.52.02.9

dei:LegalEntity

us-gaap:NotesReceivableRelatedPartiesCurrent

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value777777770
Percentage of NotesReceivableRelatedPartiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

us-gaap:NotesReceivableRelatedPartiesNoncurrent

cms:ConsumersEnergyCompany


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value969696979898991000
Percentage of NotesReceivableRelatedPartiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable

us-gaap:OffBalanceSheetCreditLossLiability

us-gaap:UnfundedLoanCommitment


Period End2020-03-31
Value3
Percentage of OffBalanceSheetCreditLossLiability100.0

us-gaap:FinancingReceivableRecordedInvestmentByClassOfFinancingReceivable, us-gaap:StatementBusinessSegments

us-gaap:UnfundedLoanCommitment, cms:EnerBank


Period End2020-06-30
Value9
Percentage of OffBalanceSheetCreditLossLiability0.0