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Leases (Schedule of Future Minimum Lease Payments for Leases) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Leases [Line Items] |  |  |  |
Capital and Financing Leases, Non-current portion | $ 123 us-gaap_CapitalLeaseObligationsNoncurrent |  | $ 138 us-gaap_CapitalLeaseObligationsNoncurrent |
Finance Leases Lessee Balance Sheet Assets Amortization And Interest Charges | 19 cms_FinanceLeasesLesseeBalanceSheetAssetsAmortizationAndInterestCharges |  | 20 cms_FinanceLeasesLesseeBalanceSheetAssetsAmortizationAndInterestCharges | 20 cms_FinanceLeasesLesseeBalanceSheetAssetsAmortizationAndInterestCharges
Consumers Energy Company [Member] |  |  |  |
Leases [Line Items] |  |  |  |
Capital and Financing Leases, Non-current portion | 123 us-gaap_CapitalLeaseObligationsNoncurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  | 138 us-gaap_CapitalLeaseObligationsNoncurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |
Operating Leases, 2015 | 25 us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |
Operating Leases, 2016 | 19 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |
Operating Leases, 2017 | 19 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |
Operating Leases, 2018 | 16 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |
Operating Leases, 2019 | 10 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |
Operating Leases, 2020 and thereafter | 40 us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |
Operating Leases, Total minimum lease payments | 129 us-gaap_OperatingLeasesFutureMinimumPaymentsDue / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |
Finance Leases Lessee Balance Sheet Assets Amortization And Interest Charges | 19 cms_FinanceLeasesLesseeBalanceSheetAssetsAmortizationAndInterestCharges / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  | 20 cms_FinanceLeasesLesseeBalanceSheetAssetsAmortizationAndInterestCharges / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 20 cms_FinanceLeasesLesseeBalanceSheetAssetsAmortizationAndInterestCharges / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Consumers Energy Company [Member] | Capital Leases [Member] |  |  |  |
Leases [Line Items] |  |  |  |
Capital and Financing Leases, 2015 | 15 us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent / cms_LeaseTypeAxis = us-gaap_CapitalLeaseObligationsMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |
Capital and Financing Leases, 2016 | 12 us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears / cms_LeaseTypeAxis = us-gaap_CapitalLeaseObligationsMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |
Capital and Financing Leases, 2017 | 11 us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears / cms_LeaseTypeAxis = us-gaap_CapitalLeaseObligationsMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |
Capital and Financing Leases, 2018 | 10 us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears / cms_LeaseTypeAxis = us-gaap_CapitalLeaseObligationsMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |
Capital and Financing Leases, 2019 | 11 us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears / cms_LeaseTypeAxis = us-gaap_CapitalLeaseObligationsMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |
Capital and Financing Leases, 2020 and thereafter | 25 us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter / cms_LeaseTypeAxis = us-gaap_CapitalLeaseObligationsMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |
Capital and Financing Leases, Total minimum lease payments | 84 us-gaap_CapitalLeasesFutureMinimumPaymentsDue / cms_LeaseTypeAxis = us-gaap_CapitalLeaseObligationsMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |
Capital and Financing Leases, Less imputed interest | 35 us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments / cms_LeaseTypeAxis = us-gaap_CapitalLeaseObligationsMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |
Capital and Financing Leases, Present value of net minimum lease payments | 49 us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments / cms_LeaseTypeAxis = us-gaap_CapitalLeaseObligationsMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |
Capital and Financing Leases, Less current portion | 8 us-gaap_CapitalLeaseObligationsCurrent / cms_LeaseTypeAxis = us-gaap_CapitalLeaseObligationsMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |
Capital and Financing Leases, Non-current portion | 41 us-gaap_CapitalLeaseObligationsNoncurrent / cms_LeaseTypeAxis = us-gaap_CapitalLeaseObligationsMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  |
Consumers Energy Company [Member] | Financing Leases [Member] |  |  |  |
Leases [Line Items] |  |  |  |
Capital and Financing Leases, 2015 | 18 us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent / cms_LeaseTypeAxis = cms_FinancingLeasesMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | [1] |  |
Capital and Financing Leases, 2016 | 17 us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears / cms_LeaseTypeAxis = cms_FinancingLeasesMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | [1] |  |
Capital and Financing Leases, 2017 | 17 us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears / cms_LeaseTypeAxis = cms_FinancingLeasesMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | [1] |  |
Capital and Financing Leases, 2018 | 16 us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears / cms_LeaseTypeAxis = cms_FinancingLeasesMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | [1] |  |
Capital and Financing Leases, 2019 | 15 us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears / cms_LeaseTypeAxis = cms_FinancingLeasesMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | [1] |  |
Capital and Financing Leases, 2020 and thereafter | 31 us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter / cms_LeaseTypeAxis = cms_FinancingLeasesMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | [1] |  |
Capital and Financing Leases, Total minimum lease payments | 114 us-gaap_CapitalLeasesFutureMinimumPaymentsDue / cms_LeaseTypeAxis = cms_FinancingLeasesMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | [1] |  |
Capital and Financing Leases, Less imputed interest | 19 us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments / cms_LeaseTypeAxis = cms_FinancingLeasesMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | [1] |  |
Capital and Financing Leases, Present value of net minimum lease payments | 95 us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments / cms_LeaseTypeAxis = cms_FinancingLeasesMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | [1] |  |
Capital and Financing Leases, Less current portion | 13 us-gaap_CapitalLeaseObligationsCurrent / cms_LeaseTypeAxis = cms_FinancingLeasesMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | [1] |  |
Capital and Financing Leases, Non-current portion | $ 82 us-gaap_CapitalLeaseObligationsNoncurrent / cms_LeaseTypeAxis = cms_FinancingLeasesMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | [1] |  |
[1] | In 2007, Consumers sold Palisades to Entergy and entered into a 15-year PPA to buy all of the capacity and energy then capable of being produced by Palisades. Consumers has continuing involvement with Palisades through security provided to Entergy for Consumers’ PPA obligation and other arrangements. Because of these ongoing arrangements, Consumers accounted for the transaction as a financing of Palisades and not a sale. Accordingly, no gain on the sale of Palisades was recognized on the consolidated statements of income. Consumers accounted for the remaining non-real-estate assets and liabilities associated with the transaction as a sale.Palisades remains on Consumers’ consolidated balance sheets and Consumers continues to depreciate it. Consumers recorded the related proceeds as a finance obligation with payments recorded to interest expense and the finance obligation based on the amortization of the obligation over the life of the Palisades PPA. The value of the finance obligation was determined based on an allocation of the transaction proceeds to the fair values of the net assets sold and fair value of the plant asset under the financing. Total amortization and interest charges under the financing were $19 million for the year ended December 31, 2014 and $20 million for each of the years ended December 31, 2013 and December 31, 2012.

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- Definition Amortization and interest charges under the financing. + References No definition available. + Details
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- Definition Amount of capital lease obligation due within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45023-112735 + Details
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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45023-112735 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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- Definition Amount of minimum lease payments for capital leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition Amount of minimum lease payments for capital leases due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition Amount of minimum lease payments for capital leases due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition Amount of minimum lease payments for capital leases due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition Amount of minimum lease payments for capital leases due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition Amount of minimum lease payments for capital leases due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition Amount of minimum lease payments for capital leases due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition Amount necessary to reduce net minimum lease payments to present value for capital leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition Present value of minimum lease payments for capital leases net of executory costs, including amounts paid by the lessee to the lessor for insurance, maintenance and taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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