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Financings and Capitalization (Debt Maturities) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014
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Long-term debt maturities, 2015 | $ 519 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
Long-term debt maturities, 2016 | 542 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
Long-term debt maturities, 2017 | 734 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
Long-term debt maturities, 2018 | 866 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
Long-term debt maturities, 2019 | 1,234 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
Consumers Energy Company [Member] |
Long-term debt maturities, 2015 | 124 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Long-term debt maturities, 2016 | 198 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Long-term debt maturities, 2017 | 375 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Long-term debt maturities, 2018 | 523 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Long-term debt maturities, 2019 | $ 876 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember

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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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