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Notes Receivable (Schedule Of Current And Non-Current Notes Receivable) (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current notes receivable | $ 103 us-gaap_NotesAndLoansReceivableNetCurrent | $ 98 us-gaap_NotesAndLoansReceivableNetCurrent
Total notes receivable | 968 us-gaap_NotesReceivableNet | 939 us-gaap_NotesReceivableNet
EnerBank [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current notes receivable | 151 us-gaap_NotesAndLoansReceivableNetCurrent / dei_LegalEntityAxis = cms_EnerBankMember | 138 us-gaap_NotesAndLoansReceivableNetCurrent / dei_LegalEntityAxis = cms_EnerBankMember
Noncurrent notes receivable | 816 us-gaap_NotesAndLoansReceivableNetNoncurrent / dei_LegalEntityAxis = cms_EnerBankMember | 800 us-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 | 102 us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cms_ReceivablesExcludingHeldForSaleMember / dei_LegalEntityAxis = cms_EnerBankMember | 97 us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cms_ReceivablesExcludingHeldForSaleMember / dei_LegalEntityAxis = cms_EnerBankMember
Receivables Held For Sale [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current notes receivable | 49 us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cms_ReceivablesHeldForSaleMember | 41 us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cms_ReceivablesHeldForSaleMember
Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current notes receivable | $ 1 us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cms_OtherReceivableMember | $ 1 us-gaap_NotesAndLoansReceivableNetCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = cms_OtherReceivableMember

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- Definition An amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money within one year from the balance sheet date (or the normal operating cycle, whichever is longer), net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale. + 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 210.5-02.3) -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 3 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4531-111522 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 + Details
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- Definition An amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date more than one year from the balance sheet date, net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale. + 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 210.5-02.17) -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 17 -Article 5 + Details
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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + 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 210.5-02.3) -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 3 -Article 5 + Details
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