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Consolidated Statements Of Changes In Equity (USD $) In Millions, except Share data | Consumers Energy Company [Member] CMS Energy Common Stock [Member] | Consumers Energy Company [Member] Other Paid-in Capital [Member] | Consumers Energy Company [Member] Accumulated Other Comprehensive Income (Loss) [Member] | Consumers Energy Company [Member] Retirement Benefits Liability [Member] | Consumers Energy Company [Member] Investments [Member] | Consumers Energy Company [Member] Retained Earnings (Accumulated Deficit) [Member] | Consumers Energy Company [Member] Preferred Stock [Member] | Consumers Energy Company [Member] | CMS Energy Common Stock [Member] | Other Paid-in Capital [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Retirement Benefits Liability [Member] | Investments [Member] | Derivative Instruments [Member] | Retained Earnings (Accumulated Deficit) [Member] | Noncontrolling Interest [Member] | Total
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Total Equity, beginning at Dec. 31, 2011 | $ 841 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 2,957 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (2)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (19)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | $ 17 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | $ 554 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 44 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | $ 4,394 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | $ 3 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 4,627 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (49)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (48)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |  | $ (1)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | $ (1,553)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 44 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | $ 3,072 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Beginning of period, shares at Dec. 31, 2011 |  |  |  |  |  |  |  |  | 254,100,000 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |
Common stock issued |  |  |  |  |  |  |  |  |  | 45 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |
Number of Shares Issued |  |  |  |  |  |  |  |  | 10,107,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |
Common stock repurchased |  |  |  |  |  |  |  |  |  | (9)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |
Common stock repurchased, shares |  |  |  |  |  |  |  |  | (389,000)us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |
Common stock reissued |  |  |  |  |  |  |  |  |  | 6 cms_CommonStockReissuedValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |
Common stock reissued, shares |  |  |  |  |  |  |  |  | 272,000 cms_CommonStockReissuedShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |
Conversion option on convertible debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reacquired, value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reacquired, shares |  |  |  |  |  |  |  |  | (18,000)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |
Stockholder contribution |  | 150 cms_AdjustmentsToAdditionalPaidInCapitalStockholderContribution / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Return of stockholder contribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net gain arising during the period |  |  |  | (8)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |  |  |  | (8)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |  | (10)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |  |  |  |  | (10)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
Prior service credit adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial loss |  |  |  | 2 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |  |  |  | 2 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |  | 2 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |  |  |  |  | 2 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax
Unrealized gain (loss) on investments, net of tax |  |  |  |  | 3 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |  | 3 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |  |  | 2 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |  |  | 2 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Reclassification adjustments included in net income, net of tax |  |  |  |  | (3)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |  | 3 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |  |  |  |  |  |  |
Net income attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 382 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 382 us-gaap_NetIncomeLoss
Net income |  |  |  |  |  | 439 us-gaap_ProfitLoss / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 439 us-gaap_ProfitLoss / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |  |  |  |  |  |  | 384 us-gaap_ProfitLoss
Common stock dividends declared |  |  |  |  |  | (393)us-gaap_DividendsCommonStockCash / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |  |  |  |  |  | (252)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Preferred stock dividends and distributions declared |  |  |  |  |  | (2)us-gaap_DividendsPreferredStockCash / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |  |  |  |  |  |  |  |
Income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 2 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Distributions, redemptions, and other changes in noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2)cms_OtherChangesInNoncontrollingInterests / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |
Preferred stock redeemed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Equity, end at Dec. 31, 2012 | 841 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 3,107 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (8)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (25)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 17 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 598 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 44 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 4,582 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 3 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 4,669 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (55)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (56)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 2 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (1)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | (1,423)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 44 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 3,238 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
End of period, shares at Dec. 31, 2012 |  |  |  |  |  |  |  |  | 264,072,000 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |
Net income attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 144 us-gaap_NetIncomeLoss
Net income |  |  |  |  |  |  |  | 162 us-gaap_ProfitLoss / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |  |  |  |  |  |  | 144 us-gaap_ProfitLoss
Total Equity, end at Mar. 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Equity, beginning at Dec. 31, 2012 | 841 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 3,107 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (8)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (25)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 17 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 598 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 44 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 4,582 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 3 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 4,669 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (55)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (56)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 2 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (1)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | (1,423)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 44 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 3,238 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Beginning of period, shares at Dec. 31, 2012 |  |  |  |  |  |  |  |  | 264,072,000 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |
Common stock issued |  |  |  |  |  |  |  |  |  | 51 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |
Number of Shares Issued |  |  |  |  |  |  |  |  | 2,238,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |
Common stock repurchased |  |  |  |  |  |  |  |  |  | (10)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |
Common stock repurchased, shares |  |  |  |  |  |  |  |  | (356,000)us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |
Common stock reissued |  |  |  |  |  |  |  |  |  | 5 cms_CommonStockReissuedValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |
Common stock reissued, shares |  |  |  |  |  |  |  |  | 205,000 cms_CommonStockReissuedShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |
Conversion option on convertible debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reacquired, value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reacquired, shares |  |  |  |  |  |  |  |  | (22,000)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |
Stockholder contribution |  | 150 cms_AdjustmentsToAdditionalPaidInCapitalStockholderContribution / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Return of stockholder contribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net gain arising during the period |  |  |  | 5 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |  |  |  | 5 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |  | 26 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |  |  |  |  | 26 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
Prior service credit adjustment |  |  |  |  |  |  |  |  |  |  |  | 5 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |  |  |  |  | 5 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax
Amortization of net actuarial loss |  |  |  | 3 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |  |  |  | 3 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |  | 4 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |  |  |  |  | 4 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax
Unrealized gain (loss) on investments, net of tax |  |  |  |  | 1 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |  | 1 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |  |  | (2)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |  |  | (2)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Reclassification adjustments included in net income, net of tax |  |  |  |  | (3)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |  | 3 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |  |  |  |  |  |  |
Net income attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 452 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 452 us-gaap_NetIncomeLoss
Net income |  |  |  |  |  | 534 us-gaap_ProfitLoss / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 534 us-gaap_ProfitLoss / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |  |  |  |  |  |  | 454 us-gaap_ProfitLoss
Common stock dividends declared |  |  |  |  |  | (406)us-gaap_DividendsCommonStockCash / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |  |  |  |  |  | (271)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Preferred stock dividends and distributions declared |  |  |  |  |  | (2)us-gaap_DividendsPreferredStockCash / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |  |  |  |  |  |  |  |
Income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 2 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Distributions, redemptions, and other changes in noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (9)cms_OtherChangesInNoncontrollingInterests / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |
Preferred stock redeemed |  |  |  |  |  |  | (7)us-gaap_StockRedeemedOrCalledDuringPeriodValue / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  |  |  |  |  |  |  |  |
Total Equity, end at Dec. 31, 2013 | 841 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 3,257 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (2)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (17)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 15 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 724 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 37 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 4,857 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 3 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 4,715 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (22)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (21)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |  |  | (1,242)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 37 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 3,491 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
End of period, shares at Dec. 31, 2013 |  |  |  |  |  |  |  | 84,100,000 us-gaap_CommonStockSharesOutstanding / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 266,137,000 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  | 266,100,000 us-gaap_CommonStockSharesOutstanding
Total Equity, beginning at Sep. 30, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 102 us-gaap_NetIncomeLoss
Net income |  |  |  |  |  |  |  | 119 us-gaap_ProfitLoss / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |  |  |  |  |  |  | 102 us-gaap_ProfitLoss
Total Equity, end at Dec. 31, 2013 | 841 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | (2)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  |  | 4,857 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  | (22)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  |  |  | 3,491 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
End of period, shares at Dec. 31, 2013 |  |  |  |  |  |  |  | 84,100,000 us-gaap_CommonStockSharesOutstanding / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |  |  |  |  |  |  | 266,100,000 us-gaap_CommonStockSharesOutstanding
Common stock issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 us-gaap_StockIssuedDuringPeriodValueNewIssues
Number of Shares Issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,070,080 us-gaap_StockIssuedDuringPeriodSharesNewIssues
Net income attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 204 us-gaap_NetIncomeLoss
Net income |  |  |  |  |  |  |  | 221 us-gaap_ProfitLoss / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |  |  |  |  |  |  | 204 us-gaap_ProfitLoss
Total Equity, end at Mar. 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Equity, beginning at Dec. 31, 2013 | 841 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 3,257 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (2)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (17)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 15 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 724 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 37 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 4,857 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 3 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 4,715 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (22)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (21)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |  | (1)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | (1,242)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 37 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 3,491 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Beginning of period, shares at Dec. 31, 2013 |  |  |  |  |  |  |  | 84,100,000 us-gaap_CommonStockSharesOutstanding / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 266,137,000 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  | 266,100,000 us-gaap_CommonStockSharesOutstanding
Common stock issued |  |  |  |  |  |  |  |  |  | 59 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |
Number of Shares Issued |  |  |  |  |  |  |  |  | 9,371,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |
Common stock repurchased |  |  |  |  |  |  |  |  |  | (7)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |
Common stock repurchased, shares |  |  |  |  |  |  |  |  | (271,000)us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |
Common stock reissued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reissued, shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion option on convertible debt |  |  |  |  |  |  |  |  |  | 7 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecuritiesNetOfAdjustments / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |
Common stock reacquired, value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reacquired, shares |  |  |  |  |  |  |  |  | (53,000)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |
Stockholder contribution |  | 495 cms_AdjustmentsToAdditionalPaidInCapitalStockholderContribution / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Return of stockholder contribution |  | (178)cms_AdjustmentsToAdditionalPaidInCapitalReturnOfStockholderContribution / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net gain arising during the period |  |  |  | (11)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |  |  |  | (11)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |  | (29)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |  |  |  |  | (29)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
Prior service credit adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial loss |  |  |  | 2 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |  |  |  | 2 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |  | 3 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |  |  |  |  | 3 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax
Amortization of prior service credit |  |  |  |  |  |  |  |  |  |  |  | (1)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |  |  |  |  | (1)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax
Unrealized gain (loss) on investments, net of tax |  |  |  |  | 4 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |  | 4 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |  |  | (1)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |  |  | (1)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Reclassification adjustments included in net income, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification adjustments included in net income |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |  |  | (1)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Net income attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 477 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 477 us-gaap_NetIncomeLoss
Net income |  |  |  |  |  | 567 us-gaap_ProfitLoss / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 567 us-gaap_ProfitLoss / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |  |  |  |  |  |  | 479 us-gaap_ProfitLoss
Common stock dividends declared |  |  |  |  |  | (457)us-gaap_DividendsCommonStockCash / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |  |  |  |  |  | (293)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Preferred stock dividends and distributions declared |  |  |  |  |  | (2)us-gaap_DividendsPreferredStockCash / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |  |  |  |  |  |  |  |
Income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 2 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Distributions, redemptions, and other changes in noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2)cms_OtherChangesInNoncontrollingInterests / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |
Preferred stock redeemed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Equity, end at Dec. 31, 2014 | 841 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 3,574 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (7)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (26)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 19 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 832 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 37 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 5,277 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 3 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 4,774 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (49)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (48)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (1)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  | (1,058)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 37 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 3,707 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
End of period, shares at Dec. 31, 2014 |  |  |  |  |  |  |  | 84,100,000 us-gaap_CommonStockSharesOutstanding / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 275,184,000 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  | 275,200,000 us-gaap_CommonStockSharesOutstanding
Total Equity, beginning at Sep. 30, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to CMS Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 96 us-gaap_NetIncomeLoss
Net income |  |  |  |  |  |  |  | 118 us-gaap_ProfitLoss / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |  |  |  |  |  |  | 97 us-gaap_ProfitLoss
Income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Total Equity, end at Dec. 31, 2014 | $ 841 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | $ (7)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  |  | $ 5,277 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  | $ (49)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |  |  |  | $ 3,707 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
End of period, shares at Dec. 31, 2014 |  |  |  |  |  |  |  | 84,100,000 us-gaap_CommonStockSharesOutstanding / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |  |  |  |  |  |  | 275,200,000 us-gaap_CommonStockSharesOutstanding

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