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v2.4.1.9

Reportable Segments (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | $ 2,111 us-gaap_Revenues |  | $ 2,523 us-gaap_Revenues |  |
Total net income available to common stockholders | 202 us-gaap_ProfitLoss |  | 204 us-gaap_ProfitLoss |  |
Plant, property, and equipment, gross | 17,930 cms_PropertyPlantAndEquipmentGrossExcludingCWIP |  |  | 17,721 cms_PropertyPlantAndEquipmentGrossExcludingCWIP |
Total Assets | 19,198 us-gaap_Assets |  |  | 19,185 us-gaap_Assets |
Consumers Energy Company [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | 2,028 us-gaap_Revenues / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  | 2,382 us-gaap_Revenues / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |
Total net income available to common stockholders | 215 us-gaap_ProfitLoss / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  | 221 us-gaap_ProfitLoss / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |
Plant, property, and equipment, gross | 17,788 cms_PublicUtilitiesPropertyPlantAndEquipmentGrossExcludingCWIP / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  | 17,580 cms_PublicUtilitiesPropertyPlantAndEquipmentGrossExcludingCWIP / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |
Total Assets | 17,854 us-gaap_Assets / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |  | 17,847 us-gaap_Assets / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |
Electric Utility [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | 1,033 us-gaap_Revenues / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_ElectricUtilityMember |  | 1,224 us-gaap_Revenues / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_ElectricUtilityMember |  |
Total net income available to common stockholders | 94 us-gaap_ProfitLoss / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_ElectricUtilityMember |  | 100 us-gaap_ProfitLoss / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_ElectricUtilityMember |  |
Plant, property, and equipment, gross | 12,397 cms_PropertyPlantAndEquipmentGrossExcludingCWIP / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_ElectricUtilityMember | [1] |  | 12,230 cms_PropertyPlantAndEquipmentGrossExcludingCWIP / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_ElectricUtilityMember | [1]
Total Assets | 11,851 us-gaap_Assets / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_ElectricUtilityMember | [1] |  | 11,582 us-gaap_Assets / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_ElectricUtilityMember | [1]
Electric Utility [Member] | Consumers Energy Company [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | 1,033 us-gaap_Revenues / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_ElectricUtilityMember |  | 1,224 us-gaap_Revenues / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_ElectricUtilityMember |  |
Total net income available to common stockholders | 94 us-gaap_ProfitLoss / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_ElectricUtilityMember |  | 100 us-gaap_ProfitLoss / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_ElectricUtilityMember |  |
Plant, property, and equipment, gross | 12,397 cms_PublicUtilitiesPropertyPlantAndEquipmentGrossExcludingCWIP / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_ElectricUtilityMember | [1] |  | 12,230 cms_PublicUtilitiesPropertyPlantAndEquipmentGrossExcludingCWIP / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_ElectricUtilityMember | [1]
Total Assets | 11,851 us-gaap_Assets / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_ElectricUtilityMember | [1] |  | 11,582 us-gaap_Assets / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_ElectricUtilityMember | [1]
Gas Utility [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | 995 us-gaap_Revenues / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_GasUtilityMember |  | 1,158 us-gaap_Revenues / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_GasUtilityMember |  |
Total net income available to common stockholders | 121 us-gaap_ProfitLoss / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_GasUtilityMember |  | 121 us-gaap_ProfitLoss / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_GasUtilityMember |  |
Plant, property, and equipment, gross | 5,376 cms_PropertyPlantAndEquipmentGrossExcludingCWIP / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_GasUtilityMember | [1] |  | 5,335 cms_PropertyPlantAndEquipmentGrossExcludingCWIP / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_GasUtilityMember | [1]
Total Assets | 5,092 us-gaap_Assets / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_GasUtilityMember | [1] |  | 5,391 us-gaap_Assets / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_GasUtilityMember | [1]
Gas Utility [Member] | Consumers Energy Company [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | 995 us-gaap_Revenues / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_GasUtilityMember |  | 1,158 us-gaap_Revenues / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_GasUtilityMember |  |
Total net income available to common stockholders | 121 us-gaap_ProfitLoss / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_GasUtilityMember |  | 121 us-gaap_ProfitLoss / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_GasUtilityMember |  |
Plant, property, and equipment, gross | 5,376 cms_PublicUtilitiesPropertyPlantAndEquipmentGrossExcludingCWIP / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_GasUtilityMember | [1] |  | 5,335 cms_PublicUtilitiesPropertyPlantAndEquipmentGrossExcludingCWIP / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_GasUtilityMember | [1]
Total Assets | 5,092 us-gaap_Assets / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_GasUtilityMember | [1] |  | 5,391 us-gaap_Assets / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_GasUtilityMember | [1]
Enterprises [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | 60 us-gaap_Revenues / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_EnterprisesMember |  | 122 us-gaap_Revenues / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_EnterprisesMember |  |
Total net income available to common stockholders | 7 us-gaap_ProfitLoss / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_EnterprisesMember |  | 2 us-gaap_ProfitLoss / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_EnterprisesMember |  |
Plant, property, and equipment, gross | 118 cms_PropertyPlantAndEquipmentGrossExcludingCWIP / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_EnterprisesMember |  |  | 115 cms_PropertyPlantAndEquipmentGrossExcludingCWIP / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_EnterprisesMember |
Total Assets | 234 us-gaap_Assets / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_EnterprisesMember |  |  | 231 us-gaap_Assets / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_EnterprisesMember |
Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | 23 us-gaap_Revenues / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_OtherSegmentMember |  | 19 us-gaap_Revenues / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_OtherSegmentMember |  |
Total net income available to common stockholders | (20)us-gaap_ProfitLoss / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_OtherSegmentMember |  | (19)us-gaap_ProfitLoss / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_OtherSegmentMember |  |
Plant, property, and equipment, gross | 39 cms_PropertyPlantAndEquipmentGrossExcludingCWIP / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_OtherSegmentMember |  |  | 41 cms_PropertyPlantAndEquipmentGrossExcludingCWIP / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_OtherSegmentMember |
Total Assets | 2,021 us-gaap_Assets / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_OtherSegmentMember |  |  | 1,981 us-gaap_Assets / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_OtherSegmentMember |
Other [Member] | Consumers Energy Company [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Plant, property, and equipment, gross | 15 cms_PublicUtilitiesPropertyPlantAndEquipmentGrossExcludingCWIP / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_OtherSegmentMember |  |  | 15 cms_PublicUtilitiesPropertyPlantAndEquipmentGrossExcludingCWIP / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_OtherSegmentMember |
Total Assets | $ 911 us-gaap_Assets / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_OtherSegmentMember |  |  | $ 874 us-gaap_Assets / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember / us-gaap_StatementOperatingActivitiesSegmentAxis = cms_OtherSegmentMember |
[1] | Amounts include a portion of Consumers’ other common assets attributable to both the electric and gas utility businesses.

X
- Definition Amount before accumulated depreciation, depletion and amortization and construction in progress 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 No definition available. + Details
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