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v2.4.1.9

Consolidated Statements Of Income (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Operating Revenue | $ 7,179 us-gaap_Revenues | $ 6,566 us-gaap_Revenues | $ 6,253 us-gaap_Revenues
Operating Expenses |  |  |
Fuel for electric generation | 673 us-gaap_FuelCosts | 621 us-gaap_FuelCosts | 598 us-gaap_FuelCosts
Purchased and interchange power | 1,602 us-gaap_UtilitiesOperatingExpensePurchasedPower | 1,387 us-gaap_UtilitiesOperatingExpensePurchasedPower | 1,364 us-gaap_UtilitiesOperatingExpensePurchasedPower
Purchased power - related parties | 90 cms_PurchasedPowerRelatedParties | 90 cms_PurchasedPowerRelatedParties | 87 cms_PurchasedPowerRelatedParties
Cost of gas sold | 1,493 us-gaap_CostOfNaturalGasPurchases | 1,228 us-gaap_CostOfNaturalGasPurchases | 1,150 us-gaap_CostOfNaturalGasPurchases
Maintenance and other operating expenses | 1,232 us-gaap_OtherCostAndExpenseOperating | 1,236 us-gaap_OtherCostAndExpenseOperating | 1,224 us-gaap_OtherCostAndExpenseOperating
Depreciation and amortization | 685 us-gaap_DepreciationDepletionAndAmortization | 628 us-gaap_DepreciationDepletionAndAmortization | 598 us-gaap_DepreciationDepletionAndAmortization
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 Income | 1,152 us-gaap_OperatingIncomeLoss | 1,142 us-gaap_OperatingIncomeLoss | 1,003 us-gaap_OperatingIncomeLoss
Other Income (Expense) |  |  |
Interest income | 5 us-gaap_InvestmentIncomeInterestAndDividend | 3 us-gaap_InvestmentIncomeInterestAndDividend | 5 us-gaap_InvestmentIncomeInterestAndDividend
Allowance for equity funds used during construction | 8 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity | 6 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity | 8 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity
Income from equity method investees | 15 us-gaap_IncomeLossFromEquityMethodInvestments | 13 us-gaap_IncomeLossFromEquityMethodInvestments | 17 us-gaap_IncomeLossFromEquityMethodInvestments
Other income | 11 us-gaap_OtherNonoperatingIncome | 10 us-gaap_OtherNonoperatingIncome | 11 us-gaap_OtherNonoperatingIncome
Other expense | (55)us-gaap_OtherNonoperatingExpense | (20)us-gaap_OtherNonoperatingExpense | (33)us-gaap_OtherNonoperatingExpense
Total other income (expense) | (16)us-gaap_NonoperatingIncomeExpense | 12 us-gaap_NonoperatingIncomeExpense | 8 us-gaap_NonoperatingIncomeExpense
Interest Charges |  |  |
Interest on long-term debt | 393 us-gaap_InterestExpenseDebt | 385 us-gaap_InterestExpenseDebt | 372 us-gaap_InterestExpenseDebt
Other interest expense | 17 us-gaap_InterestExpenseOther | 16 us-gaap_InterestExpenseOther | 21 us-gaap_InterestExpenseOther
Allowance for borrowed funds used during construction | (3)us-gaap_InterestCostsCapitalizedAdjustment | (3)us-gaap_InterestCostsCapitalizedAdjustment | (4)us-gaap_InterestCostsCapitalizedAdjustment
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 | 479 us-gaap_ProfitLoss | 454 us-gaap_ProfitLoss | 384 us-gaap_ProfitLoss
Income Attributable to Noncontrolling Interests | 2 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 2 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 2 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net Income Attributable to Common Stockholders |  |  |
Amounts attributable to continuing operations | 477 us-gaap_IncomeLossFromContinuingOperations | 452 us-gaap_IncomeLossFromContinuingOperations | 375 us-gaap_IncomeLossFromContinuingOperations
Amounts attributable to discontinued operations |  |  | 7 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Income Attributable to Noncontrolling Interests |  |  |
Amounts attributable to continuing operations | 2 us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity | 2 us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity | 2 us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity
Amounts attributable to discontinued operations |  |  |
Income attributable to noncontrolling interests | 2 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 2 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 2 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Basic Earnings Per Average Common Share |  |  |
Basic earnings from continuing operations | $ 1.76 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 1.71 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 1.43 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Basic earnings from discontinued operations |  |  | $ 0.03 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Basic earnings attributable to common stock | $ 1.76 us-gaap_EarningsPerShareBasic | $ 1.71 us-gaap_EarningsPerShareBasic | $ 1.46 us-gaap_EarningsPerShareBasic
Diluted Earnings Per Average Common Share |  |  |
Diluted earnings from continuing operations | $ 1.74 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 1.66 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 1.39 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Diluted earnings from discontinued operations |  |  | $ 0.03 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Diluted earnings attributable to common stock | $ 1.74 us-gaap_EarningsPerShareDiluted | $ 1.66 us-gaap_EarningsPerShareDiluted | $ 1.42 us-gaap_EarningsPerShareDiluted
Net income attributable to CMS Energy | 477 us-gaap_NetIncomeLoss | 452 us-gaap_NetIncomeLoss | 382 us-gaap_NetIncomeLoss
Basic Earnings Per Average Common Share | $ 1.76 us-gaap_EarningsPerShareBasic | $ 1.71 us-gaap_EarningsPerShareBasic | $ 1.46 us-gaap_EarningsPerShareBasic
Diluted Earnings Per Average Common Share | $ 1.74 us-gaap_EarningsPerShareDiluted | $ 1.66 us-gaap_EarningsPerShareDiluted | $ 1.42 us-gaap_EarningsPerShareDiluted
Consumers Energy Company [Member] |  |  |
Operating Revenue | 6,800 us-gaap_Revenues / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 6,321 us-gaap_Revenues / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 6,013 us-gaap_Revenues / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Operating Expenses |  |  |
Fuel for electric generation | 567 us-gaap_FuelCosts / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 541 us-gaap_FuelCosts / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 517 us-gaap_FuelCosts / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Purchased and interchange power | 1,564 us-gaap_UtilitiesOperatingExpensePurchasedPower / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 1,361 us-gaap_UtilitiesOperatingExpensePurchasedPower / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 1,339 us-gaap_UtilitiesOperatingExpensePurchasedPower / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Purchased power - related parties | 89 cms_PurchasedPowerRelatedParties / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 89 cms_PurchasedPowerRelatedParties / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 86 cms_PurchasedPowerRelatedParties / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Cost of gas sold | 1,375 us-gaap_CostOfNaturalGasPurchases / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 1,187 us-gaap_CostOfNaturalGasPurchases / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 1,110 us-gaap_CostOfNaturalGasPurchases / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Maintenance and other operating expenses | 1,146 us-gaap_OtherCostAndExpenseOperating / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 1,174 us-gaap_OtherCostAndExpenseOperating / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 1,162 us-gaap_OtherCostAndExpenseOperating / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Depreciation and amortization | 678 us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 622 us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 592 us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
General taxes | 246 us-gaap_TaxesExcludingIncomeAndExciseTaxes / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 229 us-gaap_TaxesExcludingIncomeAndExciseTaxes / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 223 us-gaap_TaxesExcludingIncomeAndExciseTaxes / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Total operating expenses | 5,665 us-gaap_OperatingExpenses / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 5,203 us-gaap_OperatingExpenses / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 5,029 us-gaap_OperatingExpenses / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Operating Income | 1,135 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 1,118 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 984 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Other Income (Expense) |  |  |
Interest income | 4 us-gaap_InvestmentIncomeInterestAndDividend / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 2 us-gaap_InvestmentIncomeInterestAndDividend / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 4 us-gaap_InvestmentIncomeInterestAndDividend / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Interest and dividend income - related parties | 1 cms_InterestAndDividendIncomeRelatedParties / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 1 cms_InterestAndDividendIncomeRelatedParties / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 1 cms_InterestAndDividendIncomeRelatedParties / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Allowance for equity funds used during construction | 8 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 6 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 8 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
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
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
Total other income (expense) | (12)us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 7 us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | (4)us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Interest Charges |  |  |
Interest on long-term debt | 243 us-gaap_InterestExpenseDebt / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 237 us-gaap_InterestExpenseDebt / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 232 us-gaap_InterestExpenseDebt / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Other interest expense | 10 us-gaap_InterestExpenseOther / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 11 us-gaap_InterestExpenseOther / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 16 us-gaap_InterestExpenseOther / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Allowance for borrowed funds used during construction | (3)us-gaap_InterestCostsCapitalizedAdjustment / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | (3)us-gaap_InterestCostsCapitalizedAdjustment / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | (4)us-gaap_InterestCostsCapitalizedAdjustment / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Total interest charges | 250 us-gaap_InterestExpense / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 245 us-gaap_InterestExpense / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 244 us-gaap_InterestExpense / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Income Before Income Taxes | 873 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 880 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 736 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Income Tax Expense | 306 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 346 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 297 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Net Income | 567 us-gaap_ProfitLoss / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 534 us-gaap_ProfitLoss / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 439 us-gaap_ProfitLoss / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Preferred Stock Dividends and Distribution | 2 us-gaap_PreferredStockDividendsAndOtherAdjustments / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 2 us-gaap_PreferredStockDividendsAndOtherAdjustments / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 2 us-gaap_PreferredStockDividendsAndOtherAdjustments / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Net Income Available to Common Stockholder | $ 565 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | $ 532 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | $ 437 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember

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