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Schedule I - Condensed Financial Information of Registrant (Condensed Balance Sheets) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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Cash and cash equivalents | $ 207 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | $ 172 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | $ 93 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 161 us-gaap_CashAndCashEquivalentsAtCarryingValue
Notes and accrued interest receivable | 98 us-gaap_NotesAndLoansReceivableNetCurrent |  | 63 us-gaap_NotesAndLoansReceivableNetCurrent |  |  |
Accounts receivable, including intercompany and related parties | 11 us-gaap_DueFromRelatedPartiesCurrent |  | 10 us-gaap_DueFromRelatedPartiesCurrent |  |  |
Deferred income taxes |  |  | 126 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent |  |  |
Total current assets | 2,597 us-gaap_AssetsCurrent |  | 2,526 us-gaap_AssetsCurrent |  |  |
Less accumulated depreciation and amortization | 5,415 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment |  | 5,087 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment |  |  |
Total plant, property, and equipment | 13,412 us-gaap_PropertyPlantAndEquipmentNet | [1] | 12,246 us-gaap_PropertyPlantAndEquipmentNet | [1] |  |
Other | 352 us-gaap_OtherAssetsNoncurrent |  | 409 us-gaap_OtherAssetsNoncurrent |  |  |
Total other non-current assets | 3,176 us-gaap_AssetsNoncurrent |  | 2,644 us-gaap_AssetsNoncurrent |  |  |
Total Assets | 19,185 us-gaap_Assets |  | 17,416 us-gaap_Assets |  | 17,131 us-gaap_Assets |
Current portion of long-term debt | 540 us-gaap_DebtCurrent |  | 562 us-gaap_DebtCurrent |  |  |
Accounts and notes payable, including intercompany and related parties | 10 us-gaap_DueToRelatedPartiesCurrent |  | 10 us-gaap_DueToRelatedPartiesCurrent |  |  |
Accrued interest, including intercompany | 108 us-gaap_InterestAndDividendsPayableCurrent |  | 96 us-gaap_InterestAndDividendsPayableCurrent |  |  |
Accrued taxes | 316 us-gaap_TaxesPayableCurrent |  | 297 us-gaap_TaxesPayableCurrent |  |  |
Other liabilities current | 163 us-gaap_OtherLiabilitiesCurrent |  | 146 us-gaap_OtherLiabilitiesCurrent |  |  |
Total current liabilities | 2,014 us-gaap_LiabilitiesCurrent |  | 1,945 us-gaap_LiabilitiesCurrent |  |  |
Long-term debt | 8,016 us-gaap_LongTermDebtNoncurrent |  | 7,101 us-gaap_LongTermDebtNoncurrent |  |  |
Net unamortized discount | (12)us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet |  | (12)us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet |  |  |
Postretirement benefits | 872 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent |  | 239 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent |  |  |
Other non-current liabilities | 299 us-gaap_OtherLiabilitiesNoncurrent |  | 306 us-gaap_OtherLiabilitiesNoncurrent |  |  |
Total non-current liabilities | 13,464 us-gaap_LiabilitiesNoncurrent |  | 11,980 us-gaap_LiabilitiesNoncurrent |  |  |
Common stockholders' equity | 3,670 us-gaap_StockholdersEquity |  | 3,454 us-gaap_StockholdersEquity |  |  |
Total Liabilities and Equity | 19,185 us-gaap_LiabilitiesAndStockholdersEquity |  | 17,416 us-gaap_LiabilitiesAndStockholdersEquity |  |  |
CMS Energy [Member] |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  | 2 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Notes and accrued interest receivable | 2 us-gaap_NotesAndLoansReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 1 us-gaap_NotesAndLoansReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Accounts receivable, including intercompany and related parties | 9 us-gaap_DueFromRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 7 us-gaap_DueFromRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Deferred income taxes | 3 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 2 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Total current assets | 14 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 10 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Plant, property, and equipment, gross | 16 us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 16 us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Less accumulated depreciation and amortization | 16 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 16 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Total plant, property, and equipment |  |  |  |  |  |
Deferred income taxes | 314 us-gaap_DeferredIncomeTaxesAndOtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 345 us-gaap_DeferredIncomeTaxesAndOtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Invetment in subsidiaries | 5,961 cms_InvestmentInSubsidiariesParentOnly / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 5,626 cms_InvestmentInSubsidiariesParentOnly / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Other investments - DB SERP | 22 us-gaap_AvailableForSaleSecuritiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 23 us-gaap_AvailableForSaleSecuritiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Other | 23 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 23 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Total other non-current assets | 6,320 us-gaap_AssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 6,017 us-gaap_AssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Total Assets | 6,334 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 6,027 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Current portion of long-term debt |  |  | 172 us-gaap_DebtCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Accounts and notes payable, including intercompany and related parties | 86 us-gaap_DueToRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 107 us-gaap_DueToRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Accrued interest, including intercompany | 37 us-gaap_InterestAndDividendsPayableCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 32 us-gaap_InterestAndDividendsPayableCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Accrued taxes | 138 us-gaap_TaxesPayableCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 41 us-gaap_TaxesPayableCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Other liabilities current | 4 us-gaap_OtherLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 4 us-gaap_OtherLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Total current liabilities | 265 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 356 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Long-term debt | 2,380 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 2,205 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Net unamortized discount | (7)us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (9)us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Postretirement benefits | 24 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 19 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Other non-current liabilities | 2 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 2 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Total non-current liabilities | 2,399 us-gaap_LiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 2,217 us-gaap_LiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Common stockholders' equity | 3,670 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 3,454 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Total Liabilities and Equity | $ 6,334 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | $ 6,027 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
[1] | For the year ended December 31, 2014, utility plant additions were $1.6 billion and utility plant retirements were $126 million. For the year ended December 31, 2013, utility plant additions were $1.3 billion and utility plant retirements were $156 million.

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- Definition Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer. + 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 210.5-02.21) -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 21 -Article 5 + Details
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- Definition Amount of obligation due after one year or beyond the normal operating cycle, if longer. + 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 210.5-02.22-26) -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 22, 23, 24, 25, 26, 27 -Article 5 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 210.5-02.22) -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 22 -Article 5 + Details
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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 Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer). + 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 Aggregate carrying amount of current liabilities (due within one year or within the normal operating cycle if longer) not separately disclosed in the balance sheet. Includes costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered and of liabilities not separately disclosed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -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 210 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6911-107765 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6904-107765 + Details
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- Definition This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans. + 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 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 + Details
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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 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 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 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 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E 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 210.5-02.29-31) -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 29, 30, 31 -Article 5 + Details
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- Definition Carrying value as of the balance sheet date of obligations incurred and payable for statutory income, sales, use, payroll, excise, real, property and other taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + 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 210.5-02.19,20) -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 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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