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v2.4.1.9

Consolidated Statements Of Comprehensive Income (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Net Income | $ 202 us-gaap_ProfitLoss | $ 204 us-gaap_ProfitLoss
Retirement Benefits Liability |  |
Amortization of net actuarial loss, net of tax | 1 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax |
Derivative Instruments |  |
Reclassification adjustments included in net income, net of tax |  | 1 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Other Comprehensive Income (Loss) | 1 us-gaap_OtherComprehensiveIncomeLossNetOfTax | 1 us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive Income | 203 us-gaap_ComprehensiveIncomeNetOfTax | 205 us-gaap_ComprehensiveIncomeNetOfTax
Consumers Energy Company [Member] |  |
Net Income | 215 us-gaap_ProfitLoss / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 221 us-gaap_ProfitLoss / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Retirement Benefits Liability |  |
Amortization of net actuarial loss, net of tax | 1 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |
Investments |  |
Unrealized gain (loss) on investments, net of tax |  | 2 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Reclassification adjustments included in net income, net of tax | (5)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |
Derivative Instruments |  |
Other Comprehensive Income (Loss) | (4)us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 2 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Comprehensive Income | $ 211 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | $ 223 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember

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