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Other Income and Other Expense (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Regulatory return on capital expenditures |  |  | $ 1 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions
Return on stranded costs |  |  | 1 cms_RegulatoryReturnOnStrandedCosts
Fee income | 8 cms_FeeIncome | 7 cms_FeeIncome | 7 cms_FeeIncome
All other | 3 cms_OtherOtherNonoperatingIncome | 3 cms_OtherOtherNonoperatingIncome | 2 cms_OtherOtherNonoperatingIncome
Total other income | 11 us-gaap_OtherNonoperatingIncome | 10 us-gaap_OtherNonoperatingIncome | 11 us-gaap_OtherNonoperatingIncome
Loss on reacquired and extinguished debt | (20)us-gaap_GainsLossesOnExtinguishmentOfDebt | (4)us-gaap_GainsLossesOnExtinguishmentOfDebt |
Donations | (15)cms_Donations | (4)cms_Donations | (11)cms_Donations
Civic and political expenditures | (14)cms_CivicAndPoliticalExpenditures | (5)cms_CivicAndPoliticalExpenditures | (17)cms_CivicAndPoliticalExpenditures
All other | (6)cms_OtherOtherNonoperatingExpense | (7)cms_OtherOtherNonoperatingExpense | (5)cms_OtherOtherNonoperatingExpense
Total other expense | (55)us-gaap_OtherNonoperatingExpense | (20)us-gaap_OtherNonoperatingExpense | (33)us-gaap_OtherNonoperatingExpense
Consumers Energy Company [Member] |  |  |
Regulatory return on capital expenditures |  |  | 1 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Gain on investment |  | 4 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 5 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Return on stranded costs |  |  | 1 cms_RegulatoryReturnOnStrandedCosts / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Fee income | 8 cms_FeeIncome / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 7 cms_FeeIncome / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 7 cms_FeeIncome / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
All other | 2 cms_OtherOtherNonoperatingIncome / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 3 cms_OtherOtherNonoperatingIncome / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 2 cms_OtherOtherNonoperatingIncome / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Total other income | 10 us-gaap_OtherNonoperatingIncome / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 14 us-gaap_OtherNonoperatingIncome / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 16 us-gaap_OtherNonoperatingIncome / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Donations | (15)cms_Donations / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | (4)cms_Donations / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | (11)cms_Donations / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Civic and political expenditures | (14)cms_CivicAndPoliticalExpenditures / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | (5)cms_CivicAndPoliticalExpenditures / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | (17)cms_CivicAndPoliticalExpenditures / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
All other | (6)cms_OtherOtherNonoperatingExpense / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | (7)cms_OtherOtherNonoperatingExpense / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | (5)cms_OtherOtherNonoperatingExpense / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Total other expense | $ (35)us-gaap_OtherNonoperatingExpense / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | $ (16)us-gaap_OtherNonoperatingExpense / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | $ (33)us-gaap_OtherNonoperatingExpense / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember

X
- Definition The amount of expenses incurred related to civic and political activities during the period + References No definition available. + Details
Name: | cms_CivicAndPoliticalExpenditures
Namespace Prefix: | cms_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of donations made to charitable organizations during the period + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Total increase in earnings in the period representing the amount of income generated related to miscellaneous fees. + References No definition available. + Details
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Namespace Prefix: | cms_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of other miscellaneous expense which are not identified separately as a component in Other expense table. + References No definition available. + Details
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Namespace Prefix: | cms_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition The amount of other miscellaneous income which are not identified separately as a component in Other Income table. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Total increase in earnings in the period representing the regulated allowed return on stranded costs and security costs, which is expected to be recovered through rate adjustments. + References No definition available. + Details
Name: | cms_RegulatoryReturnOnStrandedCosts
Namespace Prefix: | cms_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 + Details
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- Definition The aggregate amount of other expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating expense recognized during the period. Such amounts may include: (a) unusual costs, (b) loss on foreign exchange transactions, (c) losses on securities (net of profits), and (d) miscellaneous other expense items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The aggregate amount of other income amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) profits on securities (net of losses), and (d) miscellaneous other income items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 + Details
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- Definition Total increase in earnings in the period representing the cost of equity (based on assumed rate of return) and/or borrowed funds (based on interest rate) used to finance construction of regulated assets, which is expected to be recovered through rate adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500269&loc=d3e45485-110386 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44278-110382 + Details
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- Details
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