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Income Taxes (Principal Components Of Deferred Income Tax Assets) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Employee benefits | $ (72)cms_DeferredTaxLiabilitiesPostretirementBenefits | $ (99)cms_DeferredTaxLiabilitiesPostretirementBenefits
Gas inventory | (117)us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts | (130)us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts
Property, plant and equipment | (2,217)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | (1,856)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Net regulatory tax liability | 65 us-gaap_DeferredTaxAssetsRegulatoryAssetsAndLiabilities | 86 us-gaap_DeferredTaxAssetsRegulatoryAssetsAndLiabilities
Reserves and accruals | 63 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals | 57 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Securitized costs | (144)us-gaap_DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities | (190)us-gaap_DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities
Tax loss and credit carryforwards | 676 cms_DeferredTaxAssetsOperatingLossAndCreditCarryforwards | 629 cms_DeferredTaxAssetsOperatingLossAndCreditCarryforwards
Other |  | 15 cms_DeferredTaxAssetsLiabilitiesOther
Gross Deferred Tax Liabilities | (1,746)cms_DeferredTaxAssetsLiabilitiesBeforeValuationAllowance | (1,488)cms_DeferredTaxAssetsLiabilitiesBeforeValuationAllowance
Less: valuation allowance | (2)us-gaap_DeferredTaxAssetsValuationAllowance | (2)us-gaap_DeferredTaxAssetsValuationAllowance
Total net deferred income tax liabilities | (1,748)us-gaap_DeferredTaxLiabilities | (1,490)us-gaap_DeferredTaxLiabilities
Deferred tax assets, net of valuation reserves | 802 us-gaap_DeferredTaxAssetsNet | 785 us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities | (2,550)us-gaap_DeferredIncomeTaxLiabilities | (2,275)us-gaap_DeferredIncomeTaxLiabilities
Consumers Energy Company [Member] |  |
Employee benefits | (103)cms_DeferredTaxLiabilitiesPostretirementBenefits / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | (119)cms_DeferredTaxLiabilitiesPostretirementBenefits / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Gas inventory | (117)us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | (130)us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Property, plant and equipment | (2,263)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | (1,911)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Net regulatory tax liability | 65 us-gaap_DeferredTaxAssetsRegulatoryAssetsAndLiabilities / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 86 us-gaap_DeferredTaxAssetsRegulatoryAssetsAndLiabilities / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Reserves and accruals | 34 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 31 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Securitized costs | (144)us-gaap_DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | (190)us-gaap_DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Tax loss and credit carryforwards | 45 cms_DeferredTaxAssetsOperatingLossAndCreditCarryforwards / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 48 cms_DeferredTaxAssetsOperatingLossAndCreditCarryforwards / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Other | (2)cms_DeferredTaxAssetsLiabilitiesOther / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 16 cms_DeferredTaxAssetsLiabilitiesOther / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Gross Deferred Tax Liabilities | (2,485)cms_DeferredTaxAssetsLiabilitiesBeforeValuationAllowance / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | (2,169)cms_DeferredTaxAssetsLiabilitiesBeforeValuationAllowance / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Less: valuation allowance | (1)us-gaap_DeferredTaxAssetsValuationAllowance / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | (1)us-gaap_DeferredTaxAssetsValuationAllowance / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Total net deferred income tax liabilities | (2,486)us-gaap_DeferredTaxLiabilities / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | (2,170)us-gaap_DeferredTaxLiabilities / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Deferred tax assets, net of valuation reserves | 143 us-gaap_DeferredTaxAssetsNet / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 180 us-gaap_DeferredTaxAssetsNet / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Deferred tax liabilities | $ (2,629)us-gaap_DeferredIncomeTaxLiabilities / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | $ (2,350)us-gaap_DeferredIncomeTaxLiabilities / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember

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- Definition Amount of deferred tax assets and liabilities attributable to taxable temporary diferences not separately disclosed. + References No definition available. + Details
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- Definition The tax effect as of the balance sheet date of the amount of future tax deductions arising from tax carryforwards and the excesses of tax deductions over gross income in a year which cannot be used on the tax returns in the current year but can be carried forward to reduce taxable income or income taxes payable in a future year, for which there must be sufficient tax-basis income to utilize a portion or all of the carryforward amount to realize the deferred tax asset. + References No definition available. + Details
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- Definition Amount of deferred tax consequences attributable to taxable temporary differences derived from postretirement benefits. + References No definition available. + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Liability -URI http://asc.fasb.org/extlink&oid=6510232 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph b(2) -Article 7 + Details
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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences derived regulatory assets and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from reserves and accruals. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Amount of deferred tax consequences attributable to taxable temporary differences derived from inventory. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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