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Fair Value Measurements (Assets And Liabilties Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash equivalents | $ 110 us-gaap_CashAndCashEquivalentsFairValueDisclosure | [1] | $ 87 us-gaap_CashAndCashEquivalentsFairValueDisclosure
Restricted cash equivalents | 38 cms_RestrictedCashEquivalentsFairValueDisclosure | [1] | 16 cms_RestrictedCashEquivalentsFairValueDisclosure
Nonqualified deferred compensation plan assets | 8 cms_NonqualifiedDeferredCompensationPlanAssetsFairValueDisclosure | [1] | 6 cms_NonqualifiedDeferredCompensationPlanAssetsFairValueDisclosure
Commodity contracts | 2 us-gaap_DerivativeAssets | [1] | 5 us-gaap_DerivativeAssets
Total | 289 us-gaap_AssetsFairValueDisclosure | [1] | 250 us-gaap_AssetsFairValueDisclosure
Nonqualified deferred compensation plan liabilities | 8 cms_NonqualifiedDeferredCompensationPlanLiabilitiesFairValueDisclosure | [1] | 6 cms_NonqualifiedDeferredCompensationPlanLiabilitiesFairValueDisclosure
Commodity contracts | 1 us-gaap_DerivativeLiabilities | [1] | 1 us-gaap_DerivativeLiabilities
Total | 9 us-gaap_LiabilitiesFairValueDisclosure | [1] | 7 us-gaap_LiabilitiesFairValueDisclosure
Consumers Energy Company [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash equivalents | 19 us-gaap_CashAndCashEquivalentsFairValueDisclosure / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | [1] |
Restricted cash equivalents | 38 cms_RestrictedCashEquivalentsFairValueDisclosure / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | [1] | 15 cms_RestrictedCashEquivalentsFairValueDisclosure / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Nonqualified deferred compensation plan assets | 6 cms_NonqualifiedDeferredCompensationPlanAssetsFairValueDisclosure / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | [1] | 4 cms_NonqualifiedDeferredCompensationPlanAssetsFairValueDisclosure / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Commodity contracts | 2 us-gaap_DerivativeAssets / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | [1] | 4 us-gaap_DerivativeAssets / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Total | 196 us-gaap_AssetsFairValueDisclosure / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | [1] | 147 us-gaap_AssetsFairValueDisclosure / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Nonqualified deferred compensation plan liabilities | 6 cms_NonqualifiedDeferredCompensationPlanLiabilitiesFairValueDisclosure / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | [1] | 4 cms_NonqualifiedDeferredCompensationPlanLiabilitiesFairValueDisclosure / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Commodity contracts | 1 us-gaap_DerivativeLiabilities / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | [1] |
Total | 7 us-gaap_LiabilitiesFairValueDisclosure / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | [1] | 4 us-gaap_LiabilitiesFairValueDisclosure / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
DB SERP [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash equivalents | 4 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember | [1] |
DB SERP [Member] | Consumers Energy Company [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash equivalents | 3 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | [1] |
DB SERP [Member] | Mutual Fund [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale - Fair Value | 127 us-gaap_AvailableForSaleSecurities / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = cms_MutualFundMember | [1] | 136 us-gaap_AvailableForSaleSecurities / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = cms_MutualFundMember
DB SERP [Member] | Mutual Fund [Member] | Consumers Energy Company [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale - Fair Value | 90 us-gaap_AvailableForSaleSecurities / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = cms_MutualFundMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | [1] | 95 us-gaap_AvailableForSaleSecurities / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = cms_MutualFundMember / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
CMS Energy Common Stock [Member] | Consumers Energy Company [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available for sale - Fair Value | $ 38 us-gaap_AvailableForSaleSecurities / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | [1] | $ 29 us-gaap_AvailableForSaleSecurities / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
[1] | All assets and liabilities were classified as Level 1 with the exception of some commodity contracts, which were classified as Level 2 or Level 3, and which were insignificant at December 31, 2014 and 2013.

X
- Definition This element represents nonqualified deferred compensation plan assets measured at fair value on a recurring basis. The nonqualified deferred compensation plan assets consist of mutual funds, which are valued using quoted NAVs that are publicly available and are the basis for transactions to buy or sell shares in each fund. + References No definition available. + Details
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- Definition This element represents nonqualified deferred compensation plan liabilities measured at fair value on a recurring basis. The liabilities are based on the fair values of the plan assets, as they reflect what is owed to the plan participants in accordance with their investment elections. + References No definition available. + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. This item represents restricted cash equivalents only. + References No definition available. + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226008-175313 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226008-175313 + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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