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Plant, Property, and Equipment (Schedule of Capital Leased Asssets) (Details) (Consumers Energy Company [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Consumers Energy Company [Member] |  |
Balance at beginning of period | $ 291 us-gaap_CapitalLeasedAssetsGross / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | $ 285 us-gaap_CapitalLeasedAssetsGross / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Capital Leased Assets, Gross, Additions | 7 us-gaap_PropertyPlantAndEquipmentAdditions / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 12 us-gaap_PropertyPlantAndEquipmentAdditions / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Capital Leased Assets, Gross, Disposals and Transfers | (3)us-gaap_PropertyPlantAndEquipmentDisposals / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | (6)us-gaap_PropertyPlantAndEquipmentDisposals / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Balance at end of period | 295 us-gaap_CapitalLeasedAssetsGross / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 291 us-gaap_CapitalLeasedAssetsGross / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation | $ 143 us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | $ 124 us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember

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- Definition Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45014-112735 + Details
Name: | us-gaap_CapitalLeasedAssetsGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45014-112735 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 2) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
Name: | us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of acquisition of long-lived, 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, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentAdditions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of divestiture of long-lived, 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, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentDisposals
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration