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Financings and Capitalization (Preferred Stock of Subsidiary) (Details) (USD $) In Millions, except Share data, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Par value of Preferred Stock | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare |
Shares of Preferred Stock authorized | 10,000,000 us-gaap_PreferredStockSharesAuthorized |
Consumers Energy Company [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Par value of Preferred Stock | $ 100 us-gaap_PreferredStockParOrStatedValuePerShare / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | $ 100 us-gaap_PreferredStockParOrStatedValuePerShare / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Shares of Preferred Stock authorized | 7,500,000 us-gaap_PreferredStockSharesAuthorized / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 7,500,000 us-gaap_PreferredStockSharesAuthorized / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Preferred stock Value | $ 37 us-gaap_PreferredStockValue / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | $ 37 us-gaap_PreferredStockValue / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Preferred Stock $4.50 Series [Member] | Consumers Energy Company [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Optional Redemption Price | $ 110.00 us-gaap_PreferredStockRedemptionPricePerShare / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementClassOfStockAxis = cms_Series450Member | $ 110.00 us-gaap_PreferredStockRedemptionPricePerShare / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementClassOfStockAxis = cms_Series450Member
Number of Shares | 373,148 us-gaap_PreferredStockSharesIssued / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementClassOfStockAxis = cms_Series450Member | 373,148 us-gaap_PreferredStockSharesIssued / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementClassOfStockAxis = cms_Series450Member
Preferred stock Value | $ 37 us-gaap_PreferredStockValue / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementClassOfStockAxis = cms_Series450Member | $ 37 us-gaap_PreferredStockValue / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementClassOfStockAxis = cms_Series450Member

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- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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- Definition The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644 + Details
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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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