10-K Filing

CMS ENERGY CORP CIK: 811156 FY 2017

Filing Information

Form Type	10-K
Accession Number	`0001104659-18-009493`
Period End Date	20171231
Filing Date	20180214
Fiscal Year	2017
Fiscal Period	FY
XBRL Instance	cms-20171231.xml

Filing Contents

This filing contains the following financial statements:

Balance Sheet 117 Income Statement 136 Cash Flow Statement 106 Stockholders Equity 56 Comprehensive Income 45

Balance Sheet 117 line items

Line Item	Tag	Value	Unit	Period
Allowances for doubtful accounts receivable	`AllowanceForDoubtfulAccountsReceivableCurrent`	$24.00M	USD	Point-in-time
Allowances for doubtful accounts receivable	`AllowanceForDoubtfulAccountsReceivableCurrent`	$20.00M	USD	Point-in-time
Allowances for doubtful notes receivable	`AllowanceForNotesAndLoansReceivableCurrent`	$20.00M	USD	Point-in-time
Allowances for doubtful notes receivable	`AllowanceForNotesAndLoansReceivableCurrent`	$16.00M	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$235.00M	USD	Point-in-time
Common stock, shares authorized	`CommonStockSharesAuthorized`	350.00M	shares	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$182.00M	USD	Point-in-time
Common stock, shares authorized	`CommonStockSharesAuthorized`	350.00M	shares	Point-in-time
Common stock, shares outstanding	`CommonStockSharesOutstanding`	281.60M	shares	Point-in-time
Restricted cash and cash equivalents	`RestrictedCashAndCashEquivalentsAtCarryingValue`	$19.00M	USD	Point-in-time
Common stock, shares outstanding	`CommonStockSharesOutstanding`	279.20M	shares	Point-in-time
Restricted cash and cash equivalents	`RestrictedCashAndCashEquivalentsAtCarryingValue`	$17.00M	USD	Point-in-time
Accounts receivable and accrued revenue, less allowance	`AccountsReceivableNetCurrent`	$1.03B	USD	Point-in-time
Accounts receivable and accrued revenue, less allowance	`AccountsReceivableNetCurrent`	$821.00M	USD	Point-in-time
Notes receivable, less allowance	`NotesAndLoansReceivableNetCurrent`	$180.00M	USD	Point-in-time
Notes receivable, less allowance	`NotesAndLoansReceivableNetCurrent`	$198.00M	USD	Point-in-time
Notes receivable held for sale	`LoansReceivableHeldForSaleAmount`	$2.00M	USD	Point-in-time
Notes receivable held for sale	`LoansReceivableHeldForSaleAmount`	$39.00M	USD	Point-in-time
Accounts receivable - related parties	`DueFromRelatedPartiesCurrent`	$12.00M	USD	Point-in-time
Accounts receivable - related parties	`DueFromRelatedPartiesCurrent`	$12.00M	USD	Point-in-time
Gas in underground storage	`EnergyRelatedInventoryGasStoredUnderground`	$446.00M	USD	Point-in-time
Gas in underground storage	`EnergyRelatedInventoryGasStoredUnderground`	$458.00M	USD	Point-in-time
Materials and supplies	`OtherInventorySupplies`	$133.00M	USD	Point-in-time
Materials and supplies	`OtherInventorySupplies`	$119.00M	USD	Point-in-time
Generating plant fuel stock	`EnergyRelatedInventoryOtherFossilFuel`	$81.00M	USD	Point-in-time
Generating plant fuel stock	`EnergyRelatedInventoryOtherFossilFuel`	$61.00M	USD	Point-in-time
Deferred property taxes	`DeferredPropertyTaxes`	$250.00M	USD	Point-in-time
Deferred property taxes	`DeferredPropertyTaxes`	$257.00M	USD	Point-in-time
Regulatory assets	`RegulatoryAssetsCurrent`	$17.00M	USD	Point-in-time
Regulatory assets	`RegulatoryAssetsCurrent`	$20.00M	USD	Point-in-time
Prepayments and other current assets	`OtherAssetsCurrent`	$83.00M	USD	Point-in-time
Prepayments and other current assets	`OtherAssetsCurrent`	$81.00M	USD	Point-in-time
Total current assets	`AssetsCurrent`	$2.28B	USD	Point-in-time
Total current assets	`AssetsCurrent`	$2.48B	USD	Point-in-time
Plant, property, and equipment, gross	`PropertyPlantAndEquipmentGrossExcludingCWIP`	$22.51B	USD	Point-in-time
Plant, property, and equipment, gross	`PropertyPlantAndEquipmentGrossExcludingCWIP`	$18.94B	USD	Point-in-time
Plant, property, and equipment, gross	`PropertyPlantAndEquipmentGrossExcludingCWIP`	$21.01B	USD	Point-in-time
Less accumulated depreciation and amortization	`AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment`	$6.51B	USD	Point-in-time
Less accumulated depreciation and amortization	`AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment`	$6.06B	USD	Point-in-time
Plant, property, and equipment, net	`PropertyPlantAndEquipmentNetExcludingCWIP`	$16.00B	USD	Point-in-time
Plant, property, and equipment, net	`PropertyPlantAndEquipmentNetExcludingCWIP`	$14.95B	USD	Point-in-time
Construction work in progress	`ConstructionInProgressGross`	$761.00M	USD	Point-in-time
Construction work in progress	`ConstructionInProgressGross`	$765.00M	USD	Point-in-time
Total plant, property, and equipment	`PropertyPlantAndEquipmentNet`	$16.76B	USD	Point-in-time
Total plant, property, and equipment	`PropertyPlantAndEquipmentNet`	$15.71B	USD	Point-in-time
Regulatory assets	`RegulatoryAssetsNoncurrent`	$2.09B	USD	Point-in-time
Regulatory assets	`RegulatoryAssetsNoncurrent`	$1.76B	USD	Point-in-time
Accounts and notes receivable	`LongTermAccountsNotesAndLoansReceivableNetNoncurrent`	$1.19B	USD	Point-in-time
Accounts and notes receivable	`LongTermAccountsNotesAndLoansReceivableNetNoncurrent`	$1.12B	USD	Point-in-time
Investments	`EquityMethodInvestments`	$65.00M	USD	Point-in-time
Investments	`EquityMethodInvestments`	$64.00M	USD	Point-in-time
Investments	`EquityMethodInvestments`	$64.00M	USD	Point-in-time
Other	`OtherAssetsNoncurrent`	$799.00M	USD	Point-in-time
Other	`OtherAssetsNoncurrent`	$353.00M	USD	Point-in-time
Total other non-current assets	`AssetsNoncurrentOtherThanPropertyPlantAndEquipment`	$3.81B	USD	Point-in-time
Total other non-current assets	`AssetsNoncurrentOtherThanPropertyPlantAndEquipment`	$3.63B	USD	Point-in-time
Total Assets	`Assets`	$20.30B	USD	Point-in-time
Total Assets	`Assets`	$23.05B	USD	Point-in-time
Total Assets	`Assets`	$21.62B	USD	Point-in-time
Current portion of long-term debt, capital leases, and financing obligation	`DebtCurrent`	$886.00M	USD	Point-in-time
Current portion of long-term debt, capital leases, and financing obligation	`DebtCurrent`	$1.10B	USD	Point-in-time
Notes payable	`NotesPayableCurrent`	$170.00M	USD	Point-in-time
Notes payable	`NotesPayableCurrent`	$398.00M	USD	Point-in-time
Accounts payable	`AccountsPayableCurrent`	$598.00M	USD	Point-in-time
Accounts payable	`AccountsPayableCurrent`	$725.00M	USD	Point-in-time
Accounts payable - related parties	`DueToRelatedPartiesCurrent`	$12.00M	USD	Point-in-time
Accounts payable - related parties	`DueToRelatedPartiesCurrent`	$15.00M	USD	Point-in-time
Accrued rate refunds	`AccruedRateRefunds`	$21.00M	USD	Point-in-time
Accrued rate refunds	`AccruedRateRefunds`	$33.00M	USD	Point-in-time
Accrued interest	`InterestAndDividendsPayableCurrent`	$103.00M	USD	Point-in-time
Accrued interest	`InterestAndDividendsPayableCurrent`	$98.00M	USD	Point-in-time
Accrued taxes	`TaxesPayableCurrent`	$348.00M	USD	Point-in-time
Accrued taxes	`TaxesPayableCurrent`	$360.00M	USD	Point-in-time
Regulatory liabilities	`RegulatoryLiabilityCurrent`	$95.00M	USD	Point-in-time
Regulatory liabilities	`RegulatoryLiabilityCurrent`	$80.00M	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$199.00M	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$195.00M	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$2.65B	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$2.78B	USD	Point-in-time
Long-term debt	`LongTermDebtNoncurrent`	$9.12B	USD	Point-in-time
Long-term debt	`LongTermDebtNoncurrent`	$8.64B	USD	Point-in-time
Non-current portion of capital leases and financing obligation	`CapitalLeaseObligationsNoncurrent`	$91.00M	USD	Point-in-time
Non-current portion of capital leases and financing obligation	`CapitalLeaseObligationsNoncurrent`	$110.00M	USD	Point-in-time
Regulatory liabilities	`RegulatoryLiabilityNoncurrent`	$2.04B	USD	Point-in-time
Regulatory liabilities	`RegulatoryLiabilityNoncurrent`	$3.71B	USD	Point-in-time
Postretirement benefits	`PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent`	$766.00M	USD	Point-in-time
Postretirement benefits	`PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent`	$789.00M	USD	Point-in-time
Asset retirement obligations	`AssetRetirementObligationsNoncurrent`	$447.00M	USD	Point-in-time
Asset retirement obligations	`AssetRetirementObligationsNoncurrent`	$430.00M	USD	Point-in-time
Deferred investment tax credit	`AccumulatedDeferredInvestmentTaxCredit`	$87.00M	USD	Point-in-time
Deferred investment tax credit	`AccumulatedDeferredInvestmentTaxCredit`	$73.00M	USD	Point-in-time
Deferred income taxes	`DeferredTaxLiabilitiesNoncurrent`	$1.27B	USD	Point-in-time
Deferred income taxes	`DeferredTaxLiabilitiesNoncurrent`	$2.29B	USD	Point-in-time
Other non-current liabilities	`OtherLiabilitiesNoncurrent`	$290.00M	USD	Point-in-time
Other non-current liabilities	`OtherLiabilitiesNoncurrent`	$307.00M	USD	Point-in-time
Total non-current liabilities	`LiabilitiesNoncurrent`	$14.68B	USD	Point-in-time
Total non-current liabilities	`LiabilitiesNoncurrent`	$15.79B	USD	Point-in-time
Commitments and Contingencies (Notes 3 and 4)	`CommitmentsAndContingencies`	-	USD	Point-in-time
Commitments and Contingencies (Notes 3 and 4)	`CommitmentsAndContingencies`	-	USD	Point-in-time
Common stock	`CommonStockValue`	$3.00M	USD	Point-in-time
Common stock	`CommonStockValue`	$3.00M	USD	Point-in-time
Other paid-in capital	`AdditionalPaidInCapitalCommonStock`	$4.92B	USD	Point-in-time
Other paid-in capital	`AdditionalPaidInCapitalCommonStock`	$5.02B	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-50.00M	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-50.00M	USD	Point-in-time
Retained earnings (Accumulated deficit)	`RetainedEarningsAccumulatedDeficit`	$-616.00M	USD	Point-in-time
Retained earnings (Accumulated deficit)	`RetainedEarningsAccumulatedDeficit`	$-531.00M	USD	Point-in-time
Total common stockholders' equity	`StockholdersEquity`	$4.25B	USD	Point-in-time
Total common stockholders' equity	`StockholdersEquity`	$4.44B	USD	Point-in-time
Noncontrolling interests	`MinorityInterest`	$37.00M	USD	Point-in-time
Noncontrolling interests	`MinorityInterest`	$37.00M	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.29B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.71B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.98B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.48B	USD	Point-in-time
Total Liabilities and Equity	`LiabilitiesAndStockholdersEquity`	$23.05B	USD	Point-in-time
Total Liabilities and Equity	`LiabilitiesAndStockholdersEquity`	$21.62B	USD	Point-in-time

Income Statement 136 line items

Line Item	Tag	Value	Unit	Period
Operating Revenue	`Revenues`	$1.37B	USD	1 Quarter
Operating Revenue	`Revenues`	$1.80B	USD	1 Quarter
Operating Revenue	`Revenues`	$1.78B	USD	1 Quarter
Operating Revenue	`Revenues`	$1.53B	USD	1 Quarter
Operating Revenue	`Revenues`	$6.46B	USD	Annual
Operating Revenue	`Revenues`	$6.40B	USD	Annual
Operating Revenue	`Revenues`	$1.83B	USD	1 Quarter
Operating Revenue	`Revenues`	$6.58B	USD	Annual
Operating Revenue	`Revenues`	$1.64B	USD	1 Quarter
Operating Revenue	`Revenues`	$1.45B	USD	1 Quarter
Operating Revenue	`Revenues`	$1.59B	USD	1 Quarter
Fuel for electric generation	`FuelCosts`	$593.00M	USD	Annual
Fuel for electric generation	`FuelCosts`	$505.00M	USD	Annual
Fuel for electric generation	`FuelCosts`	$499.00M	USD	Annual
Purchased and interchange power	`UtilitiesOperatingExpensePurchasedPower`	$1.41B	USD	Annual
Purchased and interchange power	`UtilitiesOperatingExpensePurchasedPower`	$1.51B	USD	Annual
Purchased and interchange power	`UtilitiesOperatingExpensePurchasedPower`	$1.50B	USD	Annual
Purchased power - related parties	`PurchasedPowerRelatedParties`	$86.00M	USD	Annual
Purchased power - related parties	`PurchasedPowerRelatedParties`	$86.00M	USD	Annual
Purchased power - related parties	`PurchasedPowerRelatedParties`	$83.00M	USD	Annual
Cost of gas sold	`CostOfNaturalGasPurchases`	$710.00M	USD	Annual
Cost of gas sold	`CostOfNaturalGasPurchases`	$750.00M	USD	Annual
Cost of gas sold	`CostOfNaturalGasPurchases`	$961.00M	USD	Annual
Maintenance and other operating expenses	`OtherCostAndExpenseOperating`	$1.25B	USD	Annual
Maintenance and other operating expenses	`OtherCostAndExpenseOperating`	$1.24B	USD	Annual
Maintenance and other operating expenses	`OtherCostAndExpenseOperating`	$1.22B	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$811.00M	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$750.00M	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$881.00M	USD	Annual
General taxes	`TaxesExcludingIncomeAndExciseTaxes`	$281.00M	USD	Annual
General taxes	`TaxesExcludingIncomeAndExciseTaxes`	$284.00M	USD	Annual
General taxes	`TaxesExcludingIncomeAndExciseTaxes`	$262.00M	USD	Annual
Total operating expenses	`CostsAndExpenses`	$5.25B	USD	Annual
Total operating expenses	`CostsAndExpenses`	$5.14B	USD	Annual
Total operating expenses	`CostsAndExpenses`	$5.28B	USD	Annual
Operating Income	`OperatingIncomeLoss`	$241.00M	USD	1 Quarter
Operating Income	`OperatingIncomeLoss`	$280.00M	USD	1 Quarter
Operating Income	`OperatingIncomeLoss`	$1.18B	USD	Annual
Operating Income	`OperatingIncomeLoss`	$330.00M	USD	1 Quarter
Operating Income	`OperatingIncomeLoss`	$379.00M	USD	1 Quarter
Operating Income	`OperatingIncomeLoss`	$275.00M	USD	1 Quarter
Operating Income	`OperatingIncomeLoss`	$1.34B	USD	Annual
Operating Income	`OperatingIncomeLoss`	$1.26B	USD	Annual
Operating Income	`OperatingIncomeLoss`	$388.00M	USD	1 Quarter
Operating Income	`OperatingIncomeLoss`	$375.00M	USD	1 Quarter
Operating Income	`OperatingIncomeLoss`	$326.00M	USD	1 Quarter
Interest income	`InvestmentIncomeInterestAndDividend`	$6.00M	USD	Annual
Interest income	`InvestmentIncomeInterestAndDividend`	$12.00M	USD	Annual
Interest income	`InvestmentIncomeInterestAndDividend`	$12.00M	USD	Annual
Allowance for equity funds used during construction	`PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity`	$12.00M	USD	Annual
Allowance for equity funds used during construction	`PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity`	$10.00M	USD	Annual
Allowance for equity funds used during construction	`PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity`	$5.00M	USD	Annual
Income from equity method investees	`IncomeLossFromEquityMethodInvestments`	$15.00M	USD	Annual
Income from equity method investees	`IncomeLossFromEquityMethodInvestments`	$13.00M	USD	Annual
Income from equity method investees	`IncomeLossFromEquityMethodInvestments`	$14.00M	USD	Annual
Nonoperating retirement benefits, net	`OtherNonoperatingIncomeExpenseRetirementBenefitsNet`	$41.00M	USD	Annual
Nonoperating retirement benefits, net	`OtherNonoperatingIncomeExpenseRetirementBenefitsNet`	$-15.00M	USD	Annual
Nonoperating retirement benefits, net	`OtherNonoperatingIncomeExpenseRetirementBenefitsNet`	$24.00M	USD	Annual
Other income	`OtherNonoperatingIncome`	$6.00M	USD	Annual
Other income	`OtherNonoperatingIncome`	$10.00M	USD	Annual
Other income	`OtherNonoperatingIncome`	$8.00M	USD	Annual
Other expense	`OtherNonoperatingExpense`	$17.00M	USD	Annual
Other expense	`OtherNonoperatingExpense`	$76.00M	USD	Annual
Other expense	`OtherNonoperatingExpense`	$75.00M	USD	Annual
Total other income (expense)	`NonoperatingIncomeExpense`	$14.00M	USD	Annual
Total other income (expense)	`NonoperatingIncomeExpense`	$-14.00M	USD	Annual
Total other income (expense)	`NonoperatingIncomeExpense`	$5.00M	USD	Annual
Interest on long-term debt	`InterestExpenseDebt`	$411.00M	USD	Annual
Interest on long-term debt	`InterestExpenseDebt`	$406.00M	USD	Annual
Interest on long-term debt	`InterestExpenseDebt`	$386.00M	USD	Annual
Other interest expense	`InterestExpenseOther`	$14.00M	USD	Annual
Other interest expense	`InterestExpenseOther`	$34.00M	USD	Annual
Other interest expense	`InterestExpenseOther`	$29.00M	USD	Annual
Allowance for borrowed funds used during construction	`InterestCostsCapitalizedAdjustment`	$4.00M	USD	Annual
Allowance for borrowed funds used during construction	`InterestCostsCapitalizedAdjustment`	$5.00M	USD	Annual
Allowance for borrowed funds used during construction	`InterestCostsCapitalizedAdjustment`	$2.00M	USD	Annual
Total interest charges	`InterestExpense`	$438.00M	USD	Annual
Total interest charges	`InterestExpense`	$435.00M	USD	Annual
Total interest charges	`InterestExpense`	$396.00M	USD	Annual
Income Before Income Taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$826.00M	USD	Annual
Income Before Income Taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$886.00M	USD	Annual
Income Before Income Taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$796.00M	USD	Annual
Income Tax Expense	`IncomeTaxExpenseBenefit`	$424.00M	USD	Annual
Income Tax Expense	`IncomeTaxExpenseBenefit`	$273.00M	USD	Annual
Income Tax Expense	`IncomeTaxExpenseBenefit`	$271.00M	USD	Annual
Net Income	`ProfitLoss`	$553.00M	USD	Annual
Net Income	`ProfitLoss`	$78.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$462.00M	USD	Annual
Net Income	`ProfitLoss`	$172.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$-2.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$186.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$199.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$125.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$93.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$164.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$525.00M	USD	Annual
Income Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$1.00M	USD	1 Quarter
Income Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$1.00M	USD	1 Quarter
Income Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$2.00M	USD	Annual
Income Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$1.00M	USD	1 Quarter
Income Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$2.00M	USD	Annual
Income Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$2.00M	USD	Annual
Income Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$1.00M	USD	1 Quarter
Net Income Available to Common Stockholders	`NetIncomeLoss`	$460.00M	USD	Annual
Net Income Available to Common Stockholders	`NetIncomeLoss`	$186.00M	USD	1 Quarter
Net Income Available to Common Stockholders	`NetIncomeLoss`	$172.00M	USD	1 Quarter
Net Income Available to Common Stockholders	`NetIncomeLoss`	$77.00M	USD	1 Quarter
Net Income Available to Common Stockholders	`NetIncomeLoss`	$-3.00M	USD	1 Quarter
Net Income Available to Common Stockholders	`NetIncomeLoss`	$199.00M	USD	1 Quarter
Net Income Available to Common Stockholders	`NetIncomeLoss`	$124.00M	USD	1 Quarter
Net Income Available to Common Stockholders	`NetIncomeLoss`	$523.00M	USD	Annual
Net Income Available to Common Stockholders	`NetIncomeLoss`	$92.00M	USD	1 Quarter
Net Income Available to Common Stockholders	`NetIncomeLoss`	$164.00M	USD	1 Quarter
Net Income Available to Common Stockholders	`NetIncomeLoss`	$551.00M	USD	Annual
Basic Earnings Per Average Common Share	`EarningsPerShareBasic`	$0.33	USD	1 Quarter
Basic Earnings Per Average Common Share	`EarningsPerShareBasic`	$0.28	USD	1 Quarter
Basic Earnings Per Average Common Share	`EarningsPerShareBasic`	$1.90	USD	Annual
Basic Earnings Per Average Common Share	`EarningsPerShareBasic`	$0.67	USD	1 Quarter
Basic Earnings Per Average Common Share	`EarningsPerShareBasic`	$0.71	USD	1 Quarter
Basic Earnings Per Average Common Share	`EarningsPerShareBasic`	$1.99	USD	Annual
Basic Earnings Per Average Common Share	`EarningsPerShareBasic`	$0.61	USD	1 Quarter
Basic Earnings Per Average Common Share	`EarningsPerShareBasic`	$-0.01	USD	1 Quarter
Basic Earnings Per Average Common Share	`EarningsPerShareBasic`	$1.64	USD	Annual
Basic Earnings Per Average Common Share	`EarningsPerShareBasic`	$0.45	USD	1 Quarter
Basic Earnings Per Average Common Share	`EarningsPerShareBasic`	$0.59	USD	1 Quarter
Diluted Earnings Per Average Common Share	`EarningsPerShareDiluted`	$0.33	USD	1 Quarter
Diluted Earnings Per Average Common Share	`EarningsPerShareDiluted`	$0.59	USD	1 Quarter
Diluted Earnings Per Average Common Share	`EarningsPerShareDiluted`	$0.71	USD	1 Quarter
Diluted Earnings Per Average Common Share	`EarningsPerShareDiluted`	$1.64	USD	Annual
Diluted Earnings Per Average Common Share	`EarningsPerShareDiluted`	$0.67	USD	1 Quarter
Diluted Earnings Per Average Common Share	`EarningsPerShareDiluted`	$0.45	USD	1 Quarter
Diluted Earnings Per Average Common Share	`EarningsPerShareDiluted`	$0.28	USD	1 Quarter
Diluted Earnings Per Average Common Share	`EarningsPerShareDiluted`	$0.61	USD	1 Quarter
Diluted Earnings Per Average Common Share	`EarningsPerShareDiluted`	$1.98	USD	Annual
Diluted Earnings Per Average Common Share	`EarningsPerShareDiluted`	$-0.01	USD	1 Quarter
Diluted Earnings Per Average Common Share	`EarningsPerShareDiluted`	$1.89	USD	Annual

Cash Flow Statement 106 line items

Line Item	Tag	Value	Unit	Period
Net Income	`ProfitLoss`	$553.00M	USD	Annual
Net Income	`ProfitLoss`	$78.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$462.00M	USD	Annual
Net Income	`ProfitLoss`	$172.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$-2.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$186.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$199.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$125.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$93.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$164.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$525.00M	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$811.00M	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$750.00M	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$881.00M	USD	Annual
Deferred income taxes and investment tax credit	`DeferredIncomeTaxesAndTaxCredits`	$417.00M	USD	Annual
Deferred income taxes and investment tax credit	`DeferredIncomeTaxesAndTaxCredits`	$247.00M	USD	Annual
Deferred income taxes and investment tax credit	`DeferredIncomeTaxesAndTaxCredits`	$264.00M	USD	Annual
Bad debt expense	`ProvisionForDoubtfulAccounts`	$50.00M	USD	Annual
Bad debt expense	`ProvisionForDoubtfulAccounts`	$58.00M	USD	Annual
Bad debt expense	`ProvisionForDoubtfulAccounts`	$49.00M	USD	Annual
Other non-cash operating activities and reconciling adjustments	`OtherNoncashIncomeExpense`	$-100.00M	USD	Annual
Other non-cash operating activities and reconciling adjustments	`OtherNoncashIncomeExpense`	$-52.00M	USD	Annual
Other non-cash operating activities and reconciling adjustments	`OtherNoncashIncomeExpense`	$-82.00M	USD	Annual
Postretirement benefits contributions	`PensionAndOtherPostretirementBenefitContributions`	$108.00M	USD	Annual
Postretirement benefits contributions	`PensionAndOtherPostretirementBenefitContributions`	$12.00M	USD	Annual
Postretirement benefits contributions	`PensionAndOtherPostretirementBenefitContributions`	$262.00M	USD	Annual
Decrease (increase) in accounts and notes receivable and accrued revenue	`IncreaseDecreaseInAccountsAndOtherReceivables`	$66.00M	USD	Annual
Decrease (increase) in accounts and notes receivable and accrued revenue	`IncreaseDecreaseInAccountsAndOtherReceivables`	$-120.00M	USD	Annual
Decrease (increase) in accounts and notes receivable and accrued revenue	`IncreaseDecreaseInAccountsAndOtherReceivables`	$155.00M	USD	Annual
Decrease (increase) in inventories	`IncreaseDecreaseInInventories`	$-147.00M	USD	Annual
Decrease (increase) in inventories	`IncreaseDecreaseInInventories`	$-146.00M	USD	Annual
Decrease (increase) in inventories	`IncreaseDecreaseInInventories`	$46.00M	USD	Annual
Increase (decrease) in accounts payable and accrued refunds	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$59.00M	USD	Annual
Increase (decrease) in accounts payable and accrued refunds	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$49.00M	USD	Annual
Increase (decrease) in accounts payable and accrued refunds	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$-26.00M	USD	Annual
Other current and non-current assets and liabilities	`IncreaseDecreaseInOtherOperatingCapitalNet`	$19.00M	USD	Annual
Other current and non-current assets and liabilities	`IncreaseDecreaseInOtherOperatingCapitalNet`	$43.00M	USD	Annual
Other current and non-current assets and liabilities	`IncreaseDecreaseInOtherOperatingCapitalNet`	$111.00M	USD	Annual
Net cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$1.71B	USD	Annual
Net cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$1.63B	USD	Annual
Net cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$1.64B	USD	Annual
Capital expenditures (excludes assets placed under capital lease)	`PaymentsToAcquirePropertyPlantAndEquipment`	$1.56B	USD	Annual
Capital expenditures (excludes assets placed under capital lease)	`PaymentsToAcquirePropertyPlantAndEquipment`	$1.67B	USD	Annual
Capital expenditures (excludes assets placed under capital lease)	`PaymentsToAcquirePropertyPlantAndEquipment`	$1.67B	USD	Annual
Jackson plant acquisition	`PaymentsToAcquireBusinessNetOfAcquisitionCosts`	$154.00M	USD	Annual
Decrease (increase) in EnerBank notes receivable	`PaymentsForProceedsFromLoansAndLeases`	$136.00M	USD	Annual
Decrease (increase) in EnerBank notes receivable	`PaymentsForProceedsFromLoansAndLeases`	$138.00M	USD	Annual
Decrease (increase) in EnerBank notes receivable	`PaymentsForProceedsFromLoansAndLeases`	$279.00M	USD	Annual
Proceeds from the sale of EnerBank notes receivable	`ProceedsFromSaleOfNotesReceivable`	$50.00M	USD	Annual
Proceeds from the sale of EnerBank notes receivable	`ProceedsFromSaleOfNotesReceivable`	$48.00M	USD	Annual
Cost to retire property and other investing activities	`PaymentsForProceedsFromOtherInvestingActivities`	$115.00M	USD	Annual
Cost to retire property and other investing activities	`PaymentsForProceedsFromOtherInvestingActivities`	$115.00M	USD	Annual
Cost to retire property and other investing activities	`PaymentsForProceedsFromOtherInvestingActivities`	$107.00M	USD	Annual
Net cash used in investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-1.92B	USD	Annual
Net cash used in investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-1.87B	USD	Annual
Net cash used in investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-2.06B	USD	Annual
Proceeds from issuance of debt	`ProceedsFromIssuanceOfLongTermDebt`	$599.00M	USD	Annual
Proceeds from issuance of debt	`ProceedsFromIssuanceOfLongTermDebt`	$1.63B	USD	Annual
Proceeds from issuance of debt	`ProceedsFromIssuanceOfLongTermDebt`	$1.05B	USD	Annual
Net increase in EnerBank certificates of deposit	`ProceedsFromRepaymentsOfNotesPayable`	$47.00M	USD	Annual
Net increase in EnerBank certificates of deposit	`ProceedsFromRepaymentsOfNotesPayable`	$214.00M	USD	Annual
Net increase in EnerBank certificates of deposit	`ProceedsFromRepaymentsOfNotesPayable`	$100.00M	USD	Annual
Issuance of common stock	`ProceedsFromIssuanceOfCommonStock`	$72.00M	USD	Annual
Issuance of common stock	`ProceedsFromIssuanceOfCommonStock`	$43.00M	USD	Annual
Issuance of common stock	`ProceedsFromIssuanceOfCommonStock`	$83.00M	USD	Annual
Retirement of debt	`RepaymentsOfLongTermDebt`	$980.00M	USD	Annual
Retirement of debt	`RepaymentsOfLongTermDebt`	$728.00M	USD	Annual
Retirement of debt	`RepaymentsOfLongTermDebt`	$224.00M	USD	Annual
Debt prepayment costs	`PaymentsOfDebtExtinguishmentCosts`	$22.00M	USD	Annual
Debt prepayment costs	`PaymentsOfDebtExtinguishmentCosts`	$18.00M	USD	Annual
Payment of dividends on common and preferred stock	`PaymentsOfOrdinaryDividends`	$347.00M	USD	Annual
Payment of dividends on common and preferred stock	`PaymentsOfOrdinaryDividends`	$377.00M	USD	Annual
Payment of dividends on common and preferred stock	`PaymentsOfOrdinaryDividends`	$322.00M	USD	Annual
Change in notes payable	`ProceedsFromRepaymentsOfShortTermDebt`	$-228.00M	USD	Annual
Change in notes payable	`ProceedsFromRepaymentsOfShortTermDebt`	$189.00M	USD	Annual
Change in notes payable	`ProceedsFromRepaymentsOfShortTermDebt`	$149.00M	USD	Annual
Payment of capital lease obligations and other financing costs	`ProceedsFromPaymentsForOtherFinancingActivities`	$-46.00M	USD	Annual
Payment of capital lease obligations and other financing costs	`ProceedsFromPaymentsForOtherFinancingActivities`	$-22.00M	USD	Annual
Payment of capital lease obligations and other financing costs	`ProceedsFromPaymentsForOtherFinancingActivities`	$-36.00M	USD	Annual
Net cash provided by (used in) financing activities	`NetCashProvidedByUsedInFinancingActivities`	$255.00M	USD	Annual
Net cash provided by (used in) financing activities	`NetCashProvidedByUsedInFinancingActivities`	$463.00M	USD	Annual
Net cash provided by (used in) financing activities	`NetCashProvidedByUsedInFinancingActivities`	$110.00M	USD	Annual
Net Increase (Decrease) in Cash and Cash Equivalents, Including Restricted Amounts	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect`	$39.00M	USD	Annual
Net Increase (Decrease) in Cash and Cash Equivalents, Including Restricted Amounts	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect`	$-53.00M	USD	Annual
Net Increase (Decrease) in Cash and Cash Equivalents, Including Restricted Amounts	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect`	$-31.00M	USD	Annual
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$257.00M	USD	Point-in-time
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$288.00M	USD	Point-in-time
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$204.00M	USD	Point-in-time
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$249.00M	USD	Point-in-time
Cash and Cash Equivalents, Including Restricted Amounts, End of Period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$257.00M	USD	Point-in-time
Cash and Cash Equivalents, Including Restricted Amounts, End of Period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$288.00M	USD	Point-in-time
Cash and Cash Equivalents, Including Restricted Amounts, End of Period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$204.00M	USD	Point-in-time
Cash and Cash Equivalents, Including Restricted Amounts, End of Period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$249.00M	USD	Point-in-time
Interest paid (net of amounts capitalized)	`InterestPaidNet`	$418.00M	USD	Annual
Interest paid (net of amounts capitalized)	`InterestPaidNet`	$427.00M	USD	Annual
Interest paid (net of amounts capitalized)	`InterestPaidNet`	$386.00M	USD	Annual
Income taxes paid (refunds received), net	`IncomeTaxesPaidNet`	$5.00M	USD	Annual
Income taxes paid (refunds received), net	`IncomeTaxesPaidNet`	$10.00M	USD	Annual
Income taxes paid (refunds received), net	`IncomeTaxesPaidNet`	$32.00M	USD	Annual
Capital expenditures not paid	`CapitalExpendituresIncurredButNotYetPaid`	$138.00M	USD	Annual
Capital expenditures not paid	`CapitalExpendituresIncurredButNotYetPaid`	$172.00M	USD	Annual
Capital expenditures not paid	`CapitalExpendituresIncurredButNotYetPaid`	$201.00M	USD	Annual
Note receivable recorded for future refund of use taxes paid and capitalized	`RefundNotReceived`	$29.00M	USD	Annual
Other assets placed under capital lease	`CapitalLeaseObligationsIncurred`	$3.00M	USD	Annual
Other assets placed under capital lease	`CapitalLeaseObligationsIncurred`	$13.00M	USD	Annual
Other assets placed under capital lease	`CapitalLeaseObligationsIncurred`	$17.00M	USD	Annual

Stockholders Equity 56 line items

Line Item	Tag	Value	Unit	Period
Total Equity, beginning	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.29B	USD	Point-in-time
Total Equity, beginning	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.71B	USD	Point-in-time
Total Equity, beginning	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.98B	USD	Point-in-time
Total Equity, beginning	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.48B	USD	Point-in-time
Beginning of period, shares	`CommonStockSharesOutstanding`	281.60M	shares	Point-in-time
Beginning of period, shares	`CommonStockSharesOutstanding`	279.20M	shares	Point-in-time
Common stock issued	`StockIssuedDuringPeriodValueNewIssues`	$70.00M	USD	Annual
Number of Shares Issued	`StockIssuedDuringPeriodSharesNewIssues`	1.49M	shares	Annual
Net gain (loss) arising during the period	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	$-5.00M	USD	Annual
Net gain (loss) arising during the period	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	$1.00M	USD	Annual
Net gain (loss) arising during the period	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	$-8.00M	USD	Annual
Prior service credit adjustment	`OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax`	$-4.00M	USD	Annual
Amortization of net actuarial loss	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax`	$-2.00M	USD	Annual
Amortization of net actuarial loss	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax`	$-5.00M	USD	Annual
Amortization of net actuarial loss	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax`	$-2.00M	USD	Annual
Amortization of prior service credit	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax`	$-1.00M	USD	Annual
Amortization of prior service credit	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax`	$-1.00M	USD	Annual
Amortization of prior service credit	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax`	$-1.00M	USD	Annual
Unrealized gain (loss) on investments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$-3.00M	USD	Annual
Unrealized gain (loss) on investments	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$1.00M	USD	Annual
Other-than-temporary impairment included in net income	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax`	$3.00M	USD	Annual
Net income (loss) attributable to CMS Energy	`NetIncomeLoss`	$460.00M	USD	Annual
Net income (loss) attributable to CMS Energy	`NetIncomeLoss`	$186.00M	USD	1 Quarter
Net income (loss) attributable to CMS Energy	`NetIncomeLoss`	$172.00M	USD	1 Quarter
Net income (loss) attributable to CMS Energy	`NetIncomeLoss`	$77.00M	USD	1 Quarter
Net income (loss) attributable to CMS Energy	`NetIncomeLoss`	$-3.00M	USD	1 Quarter
Net income (loss) attributable to CMS Energy	`NetIncomeLoss`	$199.00M	USD	1 Quarter
Net income (loss) attributable to CMS Energy	`NetIncomeLoss`	$124.00M	USD	1 Quarter
Net income (loss) attributable to CMS Energy	`NetIncomeLoss`	$523.00M	USD	Annual
Net income (loss) attributable to CMS Energy	`NetIncomeLoss`	$92.00M	USD	1 Quarter
Net income (loss) attributable to CMS Energy	`NetIncomeLoss`	$164.00M	USD	1 Quarter
Net income (loss) attributable to CMS Energy	`NetIncomeLoss`	$551.00M	USD	Annual
Net Income	`ProfitLoss`	$553.00M	USD	Annual
Net Income	`ProfitLoss`	$78.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$462.00M	USD	Annual
Net Income	`ProfitLoss`	$172.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$-2.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$186.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$199.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$125.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$93.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$164.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$525.00M	USD	Annual
Income Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$1.00M	USD	1 Quarter
Income Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$1.00M	USD	1 Quarter
Income Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$2.00M	USD	Annual
Income Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$1.00M	USD	1 Quarter
Income Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$2.00M	USD	Annual
Income Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$2.00M	USD	Annual
Income Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$1.00M	USD	1 Quarter
End of period, shares	`CommonStockSharesOutstanding`	281.60M	shares	Point-in-time
End of period, shares	`CommonStockSharesOutstanding`	279.20M	shares	Point-in-time
Total Equity, end	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.29B	USD	Point-in-time
Total Equity, end	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.71B	USD	Point-in-time
Total Equity, end	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.98B	USD	Point-in-time
Total Equity, end	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.48B	USD	Point-in-time

Comprehensive Income 45 line items

Line Item	Tag	Value	Unit	Period
Net Income	`ProfitLoss`	$553.00M	USD	Annual
Net Income	`ProfitLoss`	$78.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$462.00M	USD	Annual
Net Income	`ProfitLoss`	$172.00M	USD	1 Quarter
Net gain (loss) arising during the period, tax	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax`	$-5.00M	USD	Annual
Net Income	`ProfitLoss`	$-2.00M	USD	1 Quarter
Net gain (loss) arising during the period, tax	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax`	$-4.00M	USD	Annual
Net Income	`ProfitLoss`	$186.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$199.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$125.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$93.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$164.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$525.00M	USD	Annual
Prior service credit adjustment, tax	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBenefitPlanImprovementTaxEffect`	$3.00M	USD	Annual
Net gain (loss) arising during the period, net of tax	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	$-5.00M	USD	Annual
Net gain (loss) arising during the period, net of tax	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	$1.00M	USD	Annual
Amortization of net actuarial loss, tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax`	$1.00M	USD	Annual
Amortization of net actuarial loss, tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax`	$4.00M	USD	Annual
Net gain (loss) arising during the period, net of tax	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	$-8.00M	USD	Annual
Prior service credit adjustment, net of tax	`OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax`	$-4.00M	USD	Annual
Amortization of prior service credit, tax	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax`	-	USD	Annual
Amortization of prior service credit, tax	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax`	-	USD	Annual
Amortization of prior service credit, tax	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax`	-	USD	Annual
Amortization of net actuarial loss, net of tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax`	$-2.00M	USD	Annual
Amortization of net actuarial loss, net of tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax`	$-5.00M	USD	Annual
Unrealized gain (loss) on investments, tax expense (tax benefit)	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax`	$-1.00M	USD	Annual
Amortization of net actuarial loss, net of tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax`	$-2.00M	USD	Annual
Amortization of prior service credit, net of tax	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax`	$-1.00M	USD	Annual
Amortization of prior service credit, net of tax	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax`	$-1.00M	USD	Annual
Amortization of prior service credit, net of tax	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax`	$-1.00M	USD	Annual
Other-than-temporary impairment, tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesTax`	$2.00M	USD	Annual
Unrealized gain (loss) on investments, net of tax	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$-3.00M	USD	Annual
Unrealized gain (loss) on investments, net of tax	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$1.00M	USD	Annual
Other-than-temporary impairment included in net income, net of tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWritedownOfSecuritiesNetOfTax`	$3.00M	USD	Annual
Other Comprehensive Income (Loss)	`OtherComprehensiveIncomeLossNetOfTax`	$-3.00M	USD	Annual
Other Comprehensive Income (Loss)	`OtherComprehensiveIncomeLossNetOfTax`	$2.00M	USD	Annual
Comprehensive Income	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$550.00M	USD	Annual
Comprehensive Income	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$527.00M	USD	Annual
Comprehensive Income	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$462.00M	USD	Annual
Comprehensive Income Attributable to Noncontrolling Interest	`ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest`	$2.00M	USD	Annual
Comprehensive Income Attributable to Noncontrolling Interest	`ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest`	$2.00M	USD	Annual
Comprehensive Income Attributable to Noncontrolling Interest	`ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest`	$2.00M	USD	Annual
Comprehensive Income Attributable to CMS Energy	`ComprehensiveIncomeNetOfTax`	$525.00M	USD	Annual
Comprehensive Income Attributable to CMS Energy	`ComprehensiveIncomeNetOfTax`	$460.00M	USD	Annual
Comprehensive Income Attributable to CMS Energy	`ComprehensiveIncomeNetOfTax`	$548.00M	USD	Annual

Data is extracted from SEC EDGAR XBRL filings. Values shown are as reported in the filing.