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Schedule II - Valuation and Qualifying Accounts and Reserves (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Allowance for Uncollectible Accounts [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | $ 33 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember | $ 32 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember | $ 35 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember
Charged to Expense | 72 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember | 63 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember | 53 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember
Charged to other Accounts |  |  |
Deductions | 65 us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember | 62 us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember | 56 us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember
Balance at End of Period | 40 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember | 33 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember | 32 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember
Allowance for Uncollectible Accounts [Member] | Consumers Energy Company [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | 31 us-gaap_ValuationAllowancesAndReservesBalance / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember | 30 us-gaap_ValuationAllowancesAndReservesBalance / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember | 33 us-gaap_ValuationAllowancesAndReservesBalance / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember
Charged to Expense | 72 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember | 63 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember | 53 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember
Charged to other Accounts |  |  |
Deductions | 64 us-gaap_ValuationAllowancesAndReservesDeductions / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember | 62 us-gaap_ValuationAllowancesAndReservesDeductions / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember | 56 us-gaap_ValuationAllowancesAndReservesDeductions / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember
Balance at End of Period | 39 us-gaap_ValuationAllowancesAndReservesBalance / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember | 31 us-gaap_ValuationAllowancesAndReservesBalance / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember | 30 us-gaap_ValuationAllowancesAndReservesBalance / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsCurrentMember
Deferred Tax Valuation Allowance [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | 2 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceOtherTaxCarryforwardMember | 3 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceOtherTaxCarryforwardMember | 20 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceOtherTaxCarryforwardMember
Charged to other Accounts |  |  | (15)us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceOtherTaxCarryforwardMember
Deductions |  | 1 us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceOtherTaxCarryforwardMember | 2 us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceOtherTaxCarryforwardMember
Balance at End of Period | 2 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceOtherTaxCarryforwardMember | 2 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceOtherTaxCarryforwardMember | 3 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceOtherTaxCarryforwardMember
Deferred Tax Valuation Allowance [Member] | Consumers Energy Company [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | 1 us-gaap_ValuationAllowancesAndReservesBalance / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceOtherTaxCarryforwardMember | 1 us-gaap_ValuationAllowancesAndReservesBalance / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceOtherTaxCarryforwardMember | 1 us-gaap_ValuationAllowancesAndReservesBalance / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceOtherTaxCarryforwardMember
Charged to Expense |  |  |
Charged to other Accounts |  |  |
Deductions |  |  |
Balance at End of Period | 1 us-gaap_ValuationAllowancesAndReservesBalance / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceOtherTaxCarryforwardMember | 1 us-gaap_ValuationAllowancesAndReservesBalance / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceOtherTaxCarryforwardMember | 1 us-gaap_ValuationAllowancesAndReservesBalance / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceOtherTaxCarryforwardMember
Allowance For Notes Receivable [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | 5 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLossesOnFinanceReceivablesMember | 5 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLossesOnFinanceReceivablesMember | 5 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLossesOnFinanceReceivablesMember
Charged to Expense | 8 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLossesOnFinanceReceivablesMember | 4 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLossesOnFinanceReceivablesMember | 4 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLossesOnFinanceReceivablesMember
Charged to other Accounts |  |  |
Deductions | 5 us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLossesOnFinanceReceivablesMember | 4 us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLossesOnFinanceReceivablesMember | 4 us-gaap_ValuationAllowancesAndReservesDeductions / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLossesOnFinanceReceivablesMember
Balance at End of Period | $ 8 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLossesOnFinanceReceivablesMember | $ 5 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLossesOnFinanceReceivablesMember | $ 5 us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForLossesOnFinanceReceivablesMember

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to accounts other than costs and expenses in a given period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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