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Notes Receivable (Narrative) (Details) (EnerBank [Member], USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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EnerBank [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Delinquent loans | $ 5 us-gaap_FinancingReceivableRecordedInvestmentPastDue / dei_LegalEntityAxis = cms_EnerBankMember | $ 5 us-gaap_FinancingReceivableRecordedInvestmentPastDue / dei_LegalEntityAxis = cms_EnerBankMember
Loans modified as troubled debt restructurings | $ 1 us-gaap_FinancingReceivableModificationsRecordedInvestment / dei_LegalEntityAxis = cms_EnerBankMember | $ 1 us-gaap_FinancingReceivableModificationsRecordedInvestment / dei_LegalEntityAxis = cms_EnerBankMember

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- Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
Name: | us-gaap_FinancingReceivableModificationsRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Recorded Investment in financing receivables that are past due at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953401-111524 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentPastDue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant