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v2.4.1.9

Consolidated Statements Of Comprehensive Income (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Net Income | $ 479 us-gaap_ProfitLoss | $ 454 us-gaap_ProfitLoss | $ 384 us-gaap_ProfitLoss
Retirement Benefits Liability |  |  |
Net gain (loss) arising during the period, net of tax | (29)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax | 26 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax | (10)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
Prior service credit adjustment, net of tax |  | 5 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax |
Amortization of net actuarial loss, net of tax | 3 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax | 4 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax | 2 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax
Amortization of prior service credit, net of tax | (1)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax |  |
Investments |  |  |
Unrealized gain (loss) on investments, net of tax | (1)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax | (2)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax | 2 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Derivative Instruments |  |  |
Reclassification adjustments included in net income, net of tax | 1 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax |  |
Other Comprehensive Income (Loss) | (27)us-gaap_OtherComprehensiveIncomeLossNetOfTax | 33 us-gaap_OtherComprehensiveIncomeLossNetOfTax | (6)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive Income | 452 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest | 487 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest | 378 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Comprehensive Income Attributable to Noncontrolling Interest | 2 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest | 2 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest | 2 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
Comprehensive Income Attributable to CMS Energy | 450 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | 485 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | 376 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Consumers Energy Company [Member] |  |  |
Net Income | 567 us-gaap_ProfitLoss / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 534 us-gaap_ProfitLoss / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 439 us-gaap_ProfitLoss / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Retirement Benefits Liability |  |  |
Net gain (loss) arising during the period, net of tax | (11)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 5 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | (8)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Amortization of net actuarial loss, net of tax | 2 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 3 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 2 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Investments |  |  |
Unrealized gain (loss) on investments, net of tax | 4 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 1 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 3 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Reclassification adjustments included in net income, net of tax |  | (3)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | (3)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Derivative Instruments |  |  |
Other Comprehensive Income (Loss) | (5)us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 6 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | (6)us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Comprehensive Income | $ 562 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | $ 540 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | $ 433 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember

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