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Stock-Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Deferred Compensation Arrangements Plan Term | 10 years |  |
Number of shares authorized | 6,500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized |  |
Maximum shares issuable per employee | 500,000 cms_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesAwardablePerEmployee |  |
Shares available for grant | 6,405,833 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant |  |
Tax benefits recognized in equity | 1 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |  |
Unrealized Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation | 76 cms_UnrealizedAdjustmentsToAdditionalPaidInCapitalIncomeTaxBenefitFromShareBasedCompensation |  |
Consumers Energy Company [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Deferred Compensation Arrangements Plan Term | 10 years |  |
Number of shares authorized | 6,500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |
Maximum shares issuable per employee | 500,000 cms_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesAwardablePerEmployee / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |
Shares available for grant | 6,405,833 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |
Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percent of Initial Grant Issued on Vesting Date | 0.00%cms_PercentOfInitialGrantIssuedOnVestingDate / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Minimum [Member] | Consumers Energy Company [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percent of Initial Grant Issued on Vesting Date | 0.00%cms_PercentOfInitialGrantIssuedOnVestingDate / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percent of Initial Grant Issued on Vesting Date | 200.00%cms_PercentOfInitialGrantIssuedOnVestingDate / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Maximum [Member] | Consumers Energy Company [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percent of Initial Grant Issued on Vesting Date | 200.00%cms_PercentOfInitialGrantIssuedOnVestingDate / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Performance-Based Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Type of award grant, percentage | 37.50%cms_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentage / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |
Service period | 38 months |  |
Vesting period | 3 years |  |
Performance-Based Restricted Stock [Member] | Consumers Energy Company [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Type of award grant, percentage | 37.50%cms_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentage / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |
Service period | 38 months |  |
Vesting period | 3 years |  |
Performance-Based Restricted Stock [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Service period | 36 months |  |
Performance-Based Restricted Stock [Member] | Minimum [Member] | Consumers Energy Company [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Service period | 36 months |  |
Market-Based Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Type of award grant, percentage | 37.50%cms_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentage / us-gaap_AwardTypeAxis = cms_MarketBasedRestrictedStockMember | 75.00%cms_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentage / us-gaap_AwardTypeAxis = cms_MarketBasedRestrictedStockMember | 75.00%cms_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentage / us-gaap_AwardTypeAxis = cms_MarketBasedRestrictedStockMember
Service period | 3 years |  |
Market-Based Restricted Stock [Member] | Consumers Energy Company [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Type of award grant, percentage | 37.50%cms_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentage / us-gaap_AwardTypeAxis = cms_MarketBasedRestrictedStockMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 75.00%cms_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentage / us-gaap_AwardTypeAxis = cms_MarketBasedRestrictedStockMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 75.00%cms_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentage / us-gaap_AwardTypeAxis = cms_MarketBasedRestrictedStockMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Service period | 3 years |  |
Time-Lapsed Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Type of award grant, percentage | 25.00%cms_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentage / us-gaap_AwardTypeAxis = cms_TimeLapsedRestrictedStockMember | 25.00%cms_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentage / us-gaap_AwardTypeAxis = cms_TimeLapsedRestrictedStockMember | 25.00%cms_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentage / us-gaap_AwardTypeAxis = cms_TimeLapsedRestrictedStockMember
Vesting period | 3 years |  |
Time-Lapsed Restricted Stock [Member] | Consumers Energy Company [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Type of award grant, percentage | 25.00%cms_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentage / us-gaap_AwardTypeAxis = cms_TimeLapsedRestrictedStockMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 25.00%cms_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentage / us-gaap_AwardTypeAxis = cms_TimeLapsedRestrictedStockMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 25.00%cms_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentage / us-gaap_AwardTypeAxis = cms_TimeLapsedRestrictedStockMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Vesting period | 3 years |  |

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- Definition Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6419406&loc=d3e23524-113945 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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