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Plant, Property, and Equipment (Jointly Owned Regulated Utility Facilities) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014
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Campbell Unit 3 [Member] |
Public Utility, Property, Plant and Equipment [Line Items] |
Ownership share | 93.30%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare / us-gaap_JointlyOwnedUtilityPlantAxis = cms_CampbellUnit3Member
Utility plant in service | $ 1,077 us-gaap_JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInService / us-gaap_JointlyOwnedUtilityPlantAxis = cms_CampbellUnit3Member
Accumulated depreciation | (503)us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciation / us-gaap_JointlyOwnedUtilityPlantAxis = cms_CampbellUnit3Member
Construction work-in-progress | 358 us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress / us-gaap_JointlyOwnedUtilityPlantAxis = cms_CampbellUnit3Member
Net investment | 932 us-gaap_JointlyOwnedUtilityPlantNetOwnershipAmount / us-gaap_JointlyOwnedUtilityPlantAxis = cms_CampbellUnit3Member
Ludington [Member] |
Public Utility, Property, Plant and Equipment [Line Items] |
Ownership share | 51.00%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare / us-gaap_JointlyOwnedUtilityPlantAxis = cms_LudingtonMember
Utility plant in service | 194 us-gaap_JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInService / us-gaap_JointlyOwnedUtilityPlantAxis = cms_LudingtonMember
Accumulated depreciation | (156)us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciation / us-gaap_JointlyOwnedUtilityPlantAxis = cms_LudingtonMember
Construction work-in-progress | 175 us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress / us-gaap_JointlyOwnedUtilityPlantAxis = cms_LudingtonMember
Net investment | 213 us-gaap_JointlyOwnedUtilityPlantNetOwnershipAmount / us-gaap_JointlyOwnedUtilityPlantAxis = cms_LudingtonMember
Distribution [Member] |
Public Utility, Property, Plant and Equipment [Line Items] |
Utility plant in service | 194 us-gaap_JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInService / us-gaap_JointlyOwnedUtilityPlantAxis = cms_DistributionMember
Accumulated depreciation | (63)us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciation / us-gaap_JointlyOwnedUtilityPlantAxis = cms_DistributionMember
Construction work-in-progress | 2 us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress / us-gaap_JointlyOwnedUtilityPlantAxis = cms_DistributionMember
Net investment | $ 133 us-gaap_JointlyOwnedUtilityPlantNetOwnershipAmount / us-gaap_JointlyOwnedUtilityPlantAxis = cms_DistributionMember

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- Definition The period end amount owned by the reporting utility of a jointly owned utility plant in service. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 10.C) -URI http://asc.fasb.org/extlink&oid=6500719&loc=d3e659983-123033 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section C + Details
Name: | us-gaap_JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInService
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The total period end amount of plant in service and construction in progress net of accumulated depreciation for the utility's share of jointly owned electricity generation plant. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 10.C) -URI http://asc.fasb.org/extlink&oid=6500719&loc=d3e659983-123033 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section C + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The period end amount of construction work in progress at a jointly owned electricity generation plant. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 10.C) -URI http://asc.fasb.org/extlink&oid=6500719&loc=d3e659983-123033 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section C + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The period end amount of accumulated depreciation in a jointly owned electricity generation plant. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 10.C) -URI http://asc.fasb.org/extlink&oid=6500719&loc=d3e659983-123033 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section C + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The proportionate share of interest (percent) in a jointly owned utility plant. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 10.C) -URI http://asc.fasb.org/extlink&oid=6500719&loc=d3e659983-123033 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section C + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=cms_CampbellUnit3Member
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Data Type: | na
Balance Type: |
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- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=cms_DistributionMember
Namespace Prefix: |
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Balance Type: |
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- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=cms_LudingtonMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |