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Stock-Based Compensation (Schedule Of Restricted Stock Granted) (Details) | 12 Months Ended
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Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 863,742 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Consumers Energy Company [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 831,069 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Time-Lapsed Restricted Stock [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 289,510 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = cms_TimeLapsedRestrictedStockMember
Time-Lapsed Restricted Stock [Member] | Consumers Energy Company [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 282,990 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = cms_TimeLapsedRestrictedStockMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Market-Based Restricted Stock [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 169,409 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = cms_MarketBasedRestrictedStockMember
Market-Based Restricted Stock [Member] | Consumers Energy Company [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 162,264 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = cms_MarketBasedRestrictedStockMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Performance-Based Restricted Stock [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 169,409 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember
Performance-Based Restricted Stock [Member] | Consumers Energy Company [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 162,264 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Dividends On Market-Based Awards [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 29,579 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = cms_DividendsOnMarketBasedAwardsMember
Dividends On Market-Based Awards [Member] | Consumers Energy Company [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 28,199 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = cms_DividendsOnMarketBasedAwardsMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Dividends On Performance-Based Awards [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 6,146 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = cms_DividendsOnPerformanceBasedAwardsMember
Dividends On Performance-Based Awards [Member] | Consumers Energy Company [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 5,888 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = cms_DividendsOnPerformanceBasedAwardsMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Additional Market-Based Shares Based On Achievement Of Condition [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 199,689 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = cms_AdditionalMarketBasedSharesBasedOnAchievementOfConditionMember
Additional Market-Based Shares Based On Achievement Of Condition [Member] | Consumers Energy Company [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of Shares, Granted | 189,464 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = cms_AdditionalMarketBasedSharesBasedOnAchievementOfConditionMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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