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Notes Receivable (Schedule Of Current And Non-Current Notes Receivable) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current notes receivable $ 98us-gaap_NotesAndLoansReceivableNetCurrent $ 63us-gaap_NotesAndLoansReceivableNetCurrent
Total notes receivable 939us-gaap_NotesReceivableNet 698us-gaap_NotesReceivableNet
Consumers Energy Company [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current notes receivable   14us-gaap_NotesAndLoansReceivableNetCurrent
/ dei_LegalEntityAxis
= cms_ConsumersEnergyCompanyMember
Total notes receivable   14us-gaap_NotesReceivableNet
/ dei_LegalEntityAxis
= cms_ConsumersEnergyCompanyMember
EnerBank [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current notes receivable 138us-gaap_NotesAndLoansReceivableNetCurrent
/ dei_LegalEntityAxis
= cms_EnerBankMember
48us-gaap_NotesAndLoansReceivableNetCurrent
/ dei_LegalEntityAxis
= cms_EnerBankMember
Noncurrent notes receivable 800us-gaap_NotesAndLoansReceivableNetNoncurrent
/ dei_LegalEntityAxis
= cms_EnerBankMember
635us-gaap_NotesAndLoansReceivableNetNoncurrent
/ dei_LegalEntityAxis
= cms_EnerBankMember
Receivables, Excluding Held For Sale [Member] | EnerBank [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current notes receivable 97us-gaap_NotesAndLoansReceivableNetCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cms_ReceivablesExcludingHeldForSaleMember
/ dei_LegalEntityAxis
= cms_EnerBankMember
48us-gaap_NotesAndLoansReceivableNetCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cms_ReceivablesExcludingHeldForSaleMember
/ dei_LegalEntityAxis
= cms_EnerBankMember
Receivables Held For Sale [Member] | EnerBank [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current notes receivable 41us-gaap_NotesAndLoansReceivableNetCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cms_ReceivablesHeldForSaleMember
/ dei_LegalEntityAxis
= cms_EnerBankMember
 
Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current notes receivable 1us-gaap_NotesAndLoansReceivableNetCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cms_OtherReceivableMember
15us-gaap_NotesAndLoansReceivableNetCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cms_OtherReceivableMember
Other [Member] | Consumers Energy Company [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current notes receivable   $ 14us-gaap_NotesAndLoansReceivableNetCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cms_OtherReceivableMember
/ dei_LegalEntityAxis
= cms_ConsumersEnergyCompanyMember