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Schedule I - Condensed Financial Information of Registrant (Condensed Statements of Income) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Other operating expense |  |  |  |  |  |  |  |  | $ (1,232)us-gaap_OtherCostAndExpenseOperating | $ (1,236)us-gaap_OtherCostAndExpenseOperating | $ (1,224)us-gaap_OtherCostAndExpenseOperating
General taxes |  |  |  |  |  |  |  |  | 252 us-gaap_TaxesExcludingIncomeAndExciseTaxes | 234 us-gaap_TaxesExcludingIncomeAndExciseTaxes | 229 us-gaap_TaxesExcludingIncomeAndExciseTaxes
Total operating expenses |  |  |  |  |  |  |  |  | (6,027)us-gaap_OperatingExpenses | (5,424)us-gaap_OperatingExpenses | (5,250)us-gaap_OperatingExpenses
Operating Loss | 273 us-gaap_OperatingIncomeLoss | 236 us-gaap_OperatingIncomeLoss | 235 us-gaap_OperatingIncomeLoss | 408 us-gaap_OperatingIncomeLoss | 264 us-gaap_OperatingIncomeLoss | 317 us-gaap_OperatingIncomeLoss | 232 us-gaap_OperatingIncomeLoss | 329 us-gaap_OperatingIncomeLoss | 1,152 us-gaap_OperatingIncomeLoss | 1,142 us-gaap_OperatingIncomeLoss | 1,003 us-gaap_OperatingIncomeLoss
Interest income |  |  |  |  |  |  |  |  | 5 us-gaap_InvestmentIncomeInterestAndDividend | 3 us-gaap_InvestmentIncomeInterestAndDividend | 5 us-gaap_InvestmentIncomeInterestAndDividend
Total other income (expense) |  |  |  |  |  |  |  |  | (16)us-gaap_NonoperatingIncomeExpense | 12 us-gaap_NonoperatingIncomeExpense | 8 us-gaap_NonoperatingIncomeExpense
Interest on long-term debt |  |  |  |  |  |  |  |  | 393 us-gaap_InterestExpenseDebt | 385 us-gaap_InterestExpenseDebt | 372 us-gaap_InterestExpenseDebt
Intercompany interest expense and other |  |  |  |  |  |  |  |  | 17 us-gaap_InterestExpenseOther | 16 us-gaap_InterestExpenseOther | 21 us-gaap_InterestExpenseOther
Total interest charges |  |  |  |  |  |  |  |  | 407 us-gaap_InterestExpense | 398 us-gaap_InterestExpense | 389 us-gaap_InterestExpense
Income Before Income Taxes |  |  |  |  |  |  |  |  | 729 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 756 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 622 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income Tax Expense |  |  |  |  |  |  |  |  | 250 us-gaap_IncomeTaxExpenseBenefit | 302 us-gaap_IncomeTaxExpenseBenefit | 245 us-gaap_IncomeTaxExpenseBenefit
Income From Continuing Operations |  |  |  |  |  |  |  |  | 479 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 454 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 377 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Income From Discontinued Operations, Net of Tax |  |  |  |  |  |  |  |  |  |  | 7 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Net income attributable to CMS Energy | 96 us-gaap_NetIncomeLoss | 94 us-gaap_NetIncomeLoss | 83 us-gaap_NetIncomeLoss | 204 us-gaap_NetIncomeLoss | 102 us-gaap_NetIncomeLoss | 126 us-gaap_NetIncomeLoss | 80 us-gaap_NetIncomeLoss | 144 us-gaap_NetIncomeLoss | 477 us-gaap_NetIncomeLoss | 452 us-gaap_NetIncomeLoss | 382 us-gaap_NetIncomeLoss
CMS Energy [Member] |  |  |  |  |  |  |  |  |  |  |
Other operating expense |  |  |  |  |  |  |  |  | (6)us-gaap_OtherCostAndExpenseOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (6)us-gaap_OtherCostAndExpenseOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (8)us-gaap_OtherCostAndExpenseOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total operating expenses |  |  |  |  |  |  |  |  | (6)us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (6)us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (8)us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Operating Loss |  |  |  |  |  |  |  |  | (6)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (6)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (8)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity earnings of subsidiaries |  |  |  |  |  |  |  |  | 585 cms_EquityEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 566 cms_EquityEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 477 cms_EquityEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest income |  |  |  |  |  |  |  |  | 1 us-gaap_InvestmentIncomeInterestAndDividend / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1 us-gaap_InvestmentIncomeInterestAndDividend / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1 us-gaap_InvestmentIncomeInterestAndDividend / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other expense |  |  |  |  |  |  |  |  | (20)us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (8)us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (5)us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total other income (expense) |  |  |  |  |  |  |  |  | 566 us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 559 us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 473 us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest on long-term debt |  |  |  |  |  |  |  |  | 150 us-gaap_InterestExpenseDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 148 us-gaap_InterestExpenseDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 140 us-gaap_InterestExpenseDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Intercompany interest expense and other |  |  |  |  |  |  |  |  | 2 us-gaap_InterestExpenseOther / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3 us-gaap_InterestExpenseOther / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5 us-gaap_InterestExpenseOther / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total interest charges |  |  |  |  |  |  |  |  | 152 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 151 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 145 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income Before Income Taxes |  |  |  |  |  |  |  |  | 408 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 402 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 320 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income Tax Expense |  |  |  |  |  |  |  |  | (69)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (50)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (62)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income From Continuing Operations |  |  |  |  |  |  |  |  | 477 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 452 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 382 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income attributable to CMS Energy |  |  |  |  |  |  |  |  | $ 477 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 452 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 382 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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