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Income Taxes (Significant Components Of Income Tax Expense) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Federal |  |  | $ 1 us-gaap_CurrentFederalTaxExpenseBenefit
State and Local | 24 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 34 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 21 us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total Current Income Tax Expense | 24 us-gaap_CurrentIncomeTaxExpenseBenefit | 34 us-gaap_CurrentIncomeTaxExpenseBenefit | 22 us-gaap_CurrentIncomeTaxExpenseBenefit
Federal, deferred income taxes | 198 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 248 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 205 us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State and Local, deferred income taxes | 31 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 23 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 21 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total Deferred Income Tax Expense | 229 us-gaap_DeferredIncomeTaxExpenseBenefit | 271 us-gaap_DeferredIncomeTaxExpenseBenefit | 226 us-gaap_DeferredIncomeTaxExpenseBenefit
Deferred income tax credit | (3)us-gaap_OtherTaxExpenseBenefit | (3)us-gaap_OtherTaxExpenseBenefit | (3)us-gaap_OtherTaxExpenseBenefit
Tax Expense | 250 us-gaap_IncomeTaxExpenseBenefit | 302 us-gaap_IncomeTaxExpenseBenefit | 245 us-gaap_IncomeTaxExpenseBenefit
Consumers Energy Company [Member] |  |  |
Federal | 8 us-gaap_CurrentFederalTaxExpenseBenefit / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 137 us-gaap_CurrentFederalTaxExpenseBenefit / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 110 us-gaap_CurrentFederalTaxExpenseBenefit / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
State and Local | 36 us-gaap_CurrentStateAndLocalTaxExpenseBenefit / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 45 us-gaap_CurrentStateAndLocalTaxExpenseBenefit / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 37 us-gaap_CurrentStateAndLocalTaxExpenseBenefit / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Total Current Income Tax Expense | 44 us-gaap_CurrentIncomeTaxExpenseBenefit / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 182 us-gaap_CurrentIncomeTaxExpenseBenefit / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 147 us-gaap_CurrentIncomeTaxExpenseBenefit / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Federal, deferred income taxes | 236 us-gaap_DeferredFederalIncomeTaxExpenseBenefit / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 147 us-gaap_DeferredFederalIncomeTaxExpenseBenefit / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 134 us-gaap_DeferredFederalIncomeTaxExpenseBenefit / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
State and Local, deferred income taxes | 29 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 20 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 19 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Total Deferred Income Tax Expense | 265 us-gaap_DeferredIncomeTaxExpenseBenefit / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 167 us-gaap_DeferredIncomeTaxExpenseBenefit / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 153 us-gaap_DeferredIncomeTaxExpenseBenefit / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Deferred income tax credit | (3)us-gaap_OtherTaxExpenseBenefit / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | (3)us-gaap_OtherTaxExpenseBenefit / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | (3)us-gaap_OtherTaxExpenseBenefit / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Tax Expense | $ 306 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | $ 346 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | $ 297 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember

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- Definition Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6509736 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section I -Subsection 7 + Details
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