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v2.4.1.9

Income Taxes (Details) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
U.S. federal income tax rate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State and local income taxes, net of federal effect | 4.80%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 4.90%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Accelerated flow-through of regulatory tax benefits | (4.90%)cms_EffectiveIncomeTaxRateReconciliationRegulatoryTaxBenefits | (5.40%)cms_EffectiveIncomeTaxRateReconciliationRegulatoryTaxBenefits
Other, net | (1.80%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | (0.50%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective tax rate | 33.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 34.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Consumers Energy Company [Member] |  |
U.S. federal income tax rate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
State and local income taxes, net of federal effect | 4.70%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 4.90%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Accelerated flow-through of regulatory tax benefits | (4.40%)cms_EffectiveIncomeTaxRateReconciliationRegulatoryTaxBenefits / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | (4.80%)cms_EffectiveIncomeTaxRateReconciliationRegulatoryTaxBenefits / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Other, net | (1.50%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | (0.70%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Effective tax rate | 33.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 34.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember

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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax (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 Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + 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 S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: 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 + Details
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- Definition Percentage 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 Reference 2: 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) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: 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 + Details
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- Definition Percentage 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 applicable to state and local income tax expense (benefit), net of federal tax expense (benefit). + 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 S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: 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 + Details
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