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Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Current Assets |  |
Cash and cash equivalents | $ 522 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 207 us-gaap_CashAndCashEquivalentsAtCarryingValue
Restricted cash and cash equivalents | 49 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue | 37 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
Accounts receivable and accrued revenue, less allowances | 908 us-gaap_AccountsReceivableNetCurrent | 881 us-gaap_AccountsReceivableNetCurrent
Notes receivable | 103 us-gaap_NotesAndLoansReceivableNetCurrent | 98 us-gaap_NotesAndLoansReceivableNetCurrent
Notes receivable held for sale | 49 us-gaap_LoansReceivableHeldForSaleAmount | 41 us-gaap_LoansReceivableHeldForSaleAmount
Accounts receivable - related parties | 11 us-gaap_DueFromRelatedPartiesCurrent | 11 us-gaap_DueFromRelatedPartiesCurrent
Accrued gas revenue |  | 27 us-gaap_DeferredFuelCost
Inventories at average cost |  |
Gas in underground storage | 328 us-gaap_EnergyRelatedInventoryGasStoredUnderground | 681 us-gaap_EnergyRelatedInventoryGasStoredUnderground
Materials and supplies | 115 us-gaap_OtherInventorySupplies | 117 us-gaap_OtherInventorySupplies
Generating plant fuel stock | 97 us-gaap_EnergyRelatedInventoryOtherFossilFuel | 120 us-gaap_EnergyRelatedInventoryOtherFossilFuel
Deferred property taxes | 178 cms_DeferredPropertyTaxes | 216 cms_DeferredPropertyTaxes
Regulatory assets | 57 us-gaap_RegulatoryAssetsCurrent | 89 us-gaap_RegulatoryAssetsCurrent
Prepayments and other current assets | 84 us-gaap_OtherAssetsCurrent | 72 us-gaap_OtherAssetsCurrent
Total current assets | 2,501 us-gaap_AssetsCurrent | 2,597 us-gaap_AssetsCurrent
Plant, Property, and Equipment |  |
Plant, property, and equipment, gross | 17,930 cms_PropertyPlantAndEquipmentGrossExcludingCWIP | 17,721 cms_PropertyPlantAndEquipmentGrossExcludingCWIP
Less accumulated depreciation and amortization | 5,545 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | 5,415 us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Plant, property, and equipment, net | 12,385 cms_PropertyPlantAndEquipmentNetExcludingCWIP | 12,306 cms_PropertyPlantAndEquipmentNetExcludingCWIP
Construction work in progress | 1,141 us-gaap_ConstructionInProgressGross | 1,106 us-gaap_ConstructionInProgressGross
Total plant, property, and equipment | 13,526 us-gaap_PropertyPlantAndEquipmentNet | 13,412 us-gaap_PropertyPlantAndEquipmentNet
Other Non-current Assets |  |
Regulatory assets | 1,932 us-gaap_RegulatoryAssetsNoncurrent | 1,956 us-gaap_RegulatoryAssetsNoncurrent
Accounts and notes receivable, less allowances | 823 us-gaap_LongTermAccountsNotesAndLoansReceivableNetNoncurrent | 807 us-gaap_LongTermAccountsNotesAndLoansReceivableNetNoncurrent
Investments | 62 us-gaap_EquityMethodInvestments | 61 us-gaap_EquityMethodInvestments
Other | 354 us-gaap_OtherAssetsNoncurrent | 352 us-gaap_OtherAssetsNoncurrent
Total other non-current assets | 3,171 us-gaap_AssetsNoncurrent | 3,176 us-gaap_AssetsNoncurrent
Total Assets | 19,198 us-gaap_Assets | 19,185 us-gaap_Assets
Current Liabilities |  |
Current portion of long-term debt, capital leases, and financing obligation | 543 us-gaap_DebtCurrent | 540 us-gaap_DebtCurrent
Notes payable |  | 60 us-gaap_NotesPayableCurrent
Accounts payable | 512 us-gaap_AccountsPayableCurrent | 678 us-gaap_AccountsPayableCurrent
Accounts payable - related parties | 9 us-gaap_DueToRelatedPartiesCurrent | 10 us-gaap_DueToRelatedPartiesCurrent
Accrued rate refunds | 23 cms_AccruedRateRefunds | 6 cms_AccruedRateRefunds
Accrued interest | 67 us-gaap_InterestAndDividendsPayableCurrent | 108 us-gaap_InterestAndDividendsPayableCurrent
Accrued taxes | 239 us-gaap_TaxesPayableCurrent | 316 us-gaap_TaxesPayableCurrent
Deferred income taxes | 21 us-gaap_DeferredTaxLiabilitiesCurrent | 66 us-gaap_DeferredTaxLiabilitiesCurrent
Regulatory liabilities | 68 us-gaap_RegulatoryLiabilityCurrent | 67 us-gaap_RegulatoryLiabilityCurrent
Other current liabilities | 117 us-gaap_OtherLiabilitiesCurrent | 163 us-gaap_OtherLiabilitiesCurrent
Total current liabilities | 1,599 us-gaap_LiabilitiesCurrent | 2,014 us-gaap_LiabilitiesCurrent
Non-current Liabilities |  |
Long-term debt | 8,143 us-gaap_LongTermDebtNoncurrent | 8,016 us-gaap_LongTermDebtNoncurrent
Non-current portion of capital leases and financing obligation | 117 us-gaap_CapitalLeaseObligationsNoncurrent | 123 us-gaap_CapitalLeaseObligationsNoncurrent
Regulatory liabilities | 2,139 us-gaap_RegulatoryLiabilityNoncurrent | 2,095 us-gaap_RegulatoryLiabilityNoncurrent
Postretirement benefits | 844 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent | 872 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
Asset retirement obligations | 344 us-gaap_AssetRetirementObligationsNoncurrent | 340 us-gaap_AssetRetirementObligationsNoncurrent
Deferred investment tax credit | 58 us-gaap_AccumulatedDeferredInvestmentTaxCredit | 37 us-gaap_AccumulatedDeferredInvestmentTaxCredit
Deferred income taxes | 1,811 us-gaap_DeferredTaxLiabilitiesNoncurrent | 1,682 us-gaap_DeferredTaxLiabilitiesNoncurrent
Other non-current liabilities | 304 us-gaap_OtherLiabilitiesNoncurrent | 299 us-gaap_OtherLiabilitiesNoncurrent
Total non-current liabilities | 13,760 us-gaap_LiabilitiesNoncurrent | 13,464 us-gaap_LiabilitiesNoncurrent
Commitments and Contingencies (Notes 2 and 3) |  |
Equity |  |
Common stock | 3 us-gaap_CommonStockValue | 3 us-gaap_CommonStockValue
Other paid-in capital | 4,783 us-gaap_AdditionalPaidInCapitalCommonStock | 4,774 us-gaap_AdditionalPaidInCapitalCommonStock
Accumulated other comprehensive loss | (48)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (49)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Retained earnings (Accumulated deficit) | (936)us-gaap_RetainedEarningsAccumulatedDeficit | (1,058)us-gaap_RetainedEarningsAccumulatedDeficit
Total common stockholders' equity | 3,802 us-gaap_StockholdersEquity | 3,670 us-gaap_StockholdersEquity
Noncontrolling interests | 37 us-gaap_MinorityInterest | 37 us-gaap_MinorityInterest
Total equity | 3,839 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 3,707 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total Liabilities and Equity | 19,198 us-gaap_LiabilitiesAndStockholdersEquity | 19,185 us-gaap_LiabilitiesAndStockholdersEquity
Consumers Energy Company [Member] |  |
Current Assets |  |
Cash and cash equivalents | 425 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 71 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Restricted cash and cash equivalents | 49 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 37 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Accounts receivable and accrued revenue, less allowances | 888 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 863 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Accounts receivable - related parties | 1 us-gaap_DueFromRelatedPartiesCurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 1 us-gaap_DueFromRelatedPartiesCurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Accrued gas revenue |  | 27 us-gaap_DeferredFuelCost / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Inventories at average cost |  |
Gas in underground storage | 328 us-gaap_EnergyRelatedInventoryGasStoredUnderground / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 681 us-gaap_EnergyRelatedInventoryGasStoredUnderground / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Materials and supplies | 110 us-gaap_OtherInventorySupplies / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 113 us-gaap_OtherInventorySupplies / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Generating plant fuel stock | 94 us-gaap_EnergyRelatedInventoryOtherFossilFuel / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 112 us-gaap_EnergyRelatedInventoryOtherFossilFuel / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Deferred property taxes | 178 cms_DeferredPropertyTaxes / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 216 cms_DeferredPropertyTaxes / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Regulatory assets | 57 us-gaap_RegulatoryAssetsCurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 89 us-gaap_RegulatoryAssetsCurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Prepayments and other current assets | 78 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 63 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Total current assets | 2,208 us-gaap_AssetsCurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 2,273 us-gaap_AssetsCurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Plant, Property, and Equipment |  |
Plant, property, and equipment, gross | 17,788 cms_PublicUtilitiesPropertyPlantAndEquipmentGrossExcludingCWIP / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 17,580 cms_PublicUtilitiesPropertyPlantAndEquipmentGrossExcludingCWIP / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Less accumulated depreciation and amortization | 5,477 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 5,346 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Plant, property, and equipment, net | 12,311 cms_PublicUtilitiesPropertyPlantAndEquipmentNetExcludingCWIP / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 12,234 cms_PublicUtilitiesPropertyPlantAndEquipmentNetExcludingCWIP / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Construction work in progress | 1,138 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 1,103 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Total plant, property, and equipment | 13,449 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 13,337 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Other Non-current Assets |  |
Regulatory assets | 1,932 us-gaap_RegulatoryAssetsNoncurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 1,956 us-gaap_RegulatoryAssetsNoncurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Accounts and notes receivable, less allowances | 7 us-gaap_LongTermAccountsNotesAndLoansReceivableNetNoncurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 7 us-gaap_LongTermAccountsNotesAndLoansReceivableNetNoncurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Investments | 28 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 38 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Other | 230 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 236 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Total other non-current assets | 2,197 us-gaap_AssetsNoncurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 2,237 us-gaap_AssetsNoncurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Total Assets | 17,854 us-gaap_Assets / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 17,847 us-gaap_Assets / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Current Liabilities |  |
Current portion of long-term debt, capital leases, and financing obligation | 135 us-gaap_DebtCurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 145 us-gaap_DebtCurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Notes payable |  | 60 us-gaap_NotesPayableCurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Accounts payable | 496 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 662 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Accounts payable - related parties | 14 us-gaap_DueToRelatedPartiesCurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 12 us-gaap_DueToRelatedPartiesCurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Accrued rate refunds | 23 cms_AccruedRateRefunds / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 6 cms_AccruedRateRefunds / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Accrued interest | 47 us-gaap_InterestAndDividendsPayableCurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 70 us-gaap_InterestAndDividendsPayableCurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Accrued taxes | 140 us-gaap_TaxesPayableCurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 149 us-gaap_TaxesPayableCurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Deferred income taxes | 67 us-gaap_DeferredTaxLiabilitiesCurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 80 us-gaap_DeferredTaxLiabilitiesCurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Regulatory liabilities | 68 us-gaap_RegulatoryLiabilityCurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 67 us-gaap_RegulatoryLiabilityCurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Other current liabilities | 90 us-gaap_OtherLiabilitiesCurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 135 us-gaap_OtherLiabilitiesCurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Total current liabilities | 1,080 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 1,386 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Non-current Liabilities |  |
Long-term debt | 5,154 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 5,154 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Non-current portion of capital leases and financing obligation | 117 us-gaap_CapitalLeaseObligationsNoncurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 123 us-gaap_CapitalLeaseObligationsNoncurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Regulatory liabilities | 2,139 us-gaap_RegulatoryLiabilityNoncurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 2,095 us-gaap_RegulatoryLiabilityNoncurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Postretirement benefits | 766 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 793 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Asset retirement obligations | 343 us-gaap_AssetRetirementObligationsNoncurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 339 us-gaap_AssetRetirementObligationsNoncurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Deferred investment tax credit | 58 us-gaap_AccumulatedDeferredInvestmentTaxCredit / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 37 us-gaap_AccumulatedDeferredInvestmentTaxCredit / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Deferred income taxes | 2,440 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 2,406 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Other non-current liabilities | 241 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 237 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Total non-current liabilities | 11,258 us-gaap_LiabilitiesNoncurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 11,184 us-gaap_LiabilitiesNoncurrent / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Commitments and Contingencies (Notes 2 and 3) |  |
Equity |  |
Common stock | 841 us-gaap_CommonStockValue / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 841 us-gaap_CommonStockValue / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Other paid-in capital | 3,724 us-gaap_AdditionalPaidInCapitalCommonStock / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 3,574 us-gaap_AdditionalPaidInCapitalCommonStock / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Accumulated other comprehensive loss | (11)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | (7)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Retained earnings (Accumulated deficit) | 925 us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 832 us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Total common stockholders' equity | 5,479 us-gaap_StockholdersEquity / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 5,240 us-gaap_StockholdersEquity / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Preferred stock | 37 us-gaap_PreferredStockValue / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 37 us-gaap_PreferredStockValue / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Total equity | 5,516 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 5,277 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Total Liabilities and Equity | $ 17,854 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | $ 17,847 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember

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