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Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Taxes [Line Items] |  |  |
Income from continuing operataions before income taxes | $ 729 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | $ 756 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | $ 622 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income from continuing operations before income taxes | 727 cms_IncomeLossFromContinuingOperationsExcludingNoncontrollingInterestsBeforeIncomeTaxes | 754 cms_IncomeLossFromContinuingOperationsExcludingNoncontrollingInterestsBeforeIncomeTaxes | 620 cms_IncomeLossFromContinuingOperationsExcludingNoncontrollingInterestsBeforeIncomeTaxes
Income tax expense at statutory rate | 254 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 264 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 217 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State and local income taxes, net of federal effect | 36 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 37 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 27 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Accelerated flow-through of regulatory tax benefits | (39)cms_IncomeTaxReconciliationRegulatoryTaxBenefits |  |
Other, net | (1)us-gaap_IncomeTaxReconciliationOtherAdjustments | 1 us-gaap_IncomeTaxReconciliationOtherAdjustments | 1 us-gaap_IncomeTaxReconciliationOtherAdjustments
Income Tax Expense | 250 us-gaap_IncomeTaxExpenseBenefit | 302 us-gaap_IncomeTaxExpenseBenefit | 245 us-gaap_IncomeTaxExpenseBenefit
Effective income tax rate | 34.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 40.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 39.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Consumers Energy Company [Member] |  |  |
Income Taxes [Line Items] |  |  |
Income from continuing operataions before income taxes | 873 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 880 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 736 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Income tax expense at statutory rate | 306 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 308 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 258 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
State and local income taxes, net of federal effect | 42 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 43 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 36 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Accelerated flow-through of regulatory tax benefits | (39)cms_IncomeTaxReconciliationRegulatoryTaxBenefits / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember |  |
Other, net | (3)us-gaap_IncomeTaxReconciliationOtherAdjustments / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | (5)us-gaap_IncomeTaxReconciliationOtherAdjustments / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 3 us-gaap_IncomeTaxReconciliationOtherAdjustments / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Income 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
Effective income tax rate | 35.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 39.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 40.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember

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- Definition The earnings or loss from continuing operations before income taxes excluding earnings or loss from noncontrolling interests + References No definition available. + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to regulatory tax benefits. + References No definition available. + Details
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: 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)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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- Definition This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35710027&loc=d3e41242-110953 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 5 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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