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Plant, Property, and Equipment (Public Utilities Property Plant and Equipment Schedule of Accumulated Depreciation and Amortization) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Public Utility, Property, Plant and Equipment [Line Items] |  |
Accumulated Depreciation, Depletion and Amortization | $ 5,415 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | $ 5,087 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Consumers Energy Company [Member] |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Accumulated depreciation and amortization | 5,346 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 5,022 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Utility Plant Assets [Member] |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Accumulated Depreciation, Depletion and Amortization | 5,345 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PublicUtilityAxis = cms_UtilityPlantAssetsMember | 5,021 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PublicUtilityAxis = cms_UtilityPlantAssetsMember
Utility Plant Assets [Member] | Consumers Energy Company [Member] |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Accumulated depreciation and amortization | 5,345 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_PublicUtilityAxis = cms_UtilityPlantAssetsMember | 5,021 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_PublicUtilityAxis = cms_UtilityPlantAssetsMember
Non-Utility Plant Assets [Member] |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Accumulated Depreciation, Depletion and Amortization | 70 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PublicUtilityAxis = cms_NonUtilityPlantAssetsMember | 66 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PublicUtilityAxis = cms_NonUtilityPlantAssetsMember
Non-Utility Plant Assets [Member] | Consumers Energy Company [Member] |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Accumulated depreciation and amortization | $ 1 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_PublicUtilityAxis = cms_NonUtilityPlantAssetsMember | $ 1 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_PublicUtilityAxis = cms_NonUtilityPlantAssetsMember

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- Definition Amount of accumulated depreciation, depletion and amortization for 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 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -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 210.5-02.14) -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 14 -Article 5 + Details
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- Definition Period end book value of accumulated depreciation on property, plant and equipment (PPE) that is owned by the regulated operations of the public utility. + References No definition available. + Details
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