10-K Filing

CMS ENERGY CORP CIK: 811156 FY 2015

Filing Information

Form Type	10-K
Accession Number	`0001104659-16-095725`
Period End Date	20151231
Filing Date	20160211
Fiscal Year	2015
Fiscal Period	FY
XBRL Instance	cms-20151231.xml

Filing Contents

This filing contains the following financial statements:

Balance Sheet 121 Income Statement 133 Cash Flow Statement 109 Stockholders Equity 54 Comprehensive Income 48

Balance Sheet 121 line items

Line Item	Tag	Value	Unit	Period
Allowances for doubtful accounts receivable	`AllowanceForDoubtfulAccountsReceivableCurrent`	$28.00M	USD	Point-in-time
Allowances for doubtful accounts receivable	`AllowanceForDoubtfulAccountsReceivableCurrent`	$40.00M	USD	Point-in-time
Allowances for doubtful notes receivable	`AllowanceForNotesAndLoansReceivableCurrent`	$9.00M	USD	Point-in-time
Allowances for doubtful notes receivable	`AllowanceForNotesAndLoansReceivableCurrent`	$8.00M	USD	Point-in-time
Common stock, shares authorized	`CommonStockSharesAuthorized`	350.00M	shares	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$93.00M	USD	Point-in-time
Common stock, shares authorized	`CommonStockSharesAuthorized`	350.00M	shares	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$172.00M	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$207.00M	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$266.00M	USD	Point-in-time
Common stock, shares outstanding	`CommonStockSharesOutstanding`	275.20M	shares	Point-in-time
Restricted cash and cash equivalents	`RestrictedCashAndCashEquivalentsAtCarryingValue`	$19.00M	USD	Point-in-time
Common stock, shares outstanding	`CommonStockSharesOutstanding`	277.20M	shares	Point-in-time
Restricted cash and cash equivalents	`RestrictedCashAndCashEquivalentsAtCarryingValue`	$37.00M	USD	Point-in-time
Accounts receivable and accrued revenue, less allowances	`AccountsReceivableNetCurrent`	$774.00M	USD	Point-in-time
Accounts receivable and accrued revenue, less allowances	`AccountsReceivableNetCurrent`	$881.00M	USD	Point-in-time
Notes receivable, less allowances	`NotesAndLoansReceivableNetCurrent`	$128.00M	USD	Point-in-time
Notes receivable, less allowances	`NotesAndLoansReceivableNetCurrent`	$98.00M	USD	Point-in-time
Notes receivable held for sale	`LoansReceivableHeldForSaleAmount`	$41.00M	USD	Point-in-time
Notes receivable held for sale	`LoansReceivableHeldForSaleAmount`	$16.00M	USD	Point-in-time
Accounts receivable - related parties	`DueFromRelatedPartiesCurrent`	$11.00M	USD	Point-in-time
Accounts receivable - related parties	`DueFromRelatedPartiesCurrent`	$11.00M	USD	Point-in-time
Accrued gas revenue	`DeferredFuelCost`	-	USD	Point-in-time
Accrued gas revenue	`DeferredFuelCost`	$27.00M	USD	Point-in-time
Gas in underground storage	`EnergyRelatedInventoryGasStoredUnderground`	$568.00M	USD	Point-in-time
Gas in underground storage	`EnergyRelatedInventoryGasStoredUnderground`	$681.00M	USD	Point-in-time
Materials and supplies	`OtherInventorySupplies`	$126.00M	USD	Point-in-time
Materials and supplies	`OtherInventorySupplies`	$117.00M	USD	Point-in-time
Generating plant fuel stock	`EnergyRelatedInventoryOtherFossilFuel`	$120.00M	USD	Point-in-time
Generating plant fuel stock	`EnergyRelatedInventoryOtherFossilFuel`	$84.00M	USD	Point-in-time
Deferred property taxes	`DeferredPropertyTaxes`	$235.00M	USD	Point-in-time
Deferred property taxes	`DeferredPropertyTaxes`	$216.00M	USD	Point-in-time
Regulatory assets	`RegulatoryAssetsCurrent`	$16.00M	USD	Point-in-time
Regulatory assets	`RegulatoryAssetsCurrent`	$89.00M	USD	Point-in-time
Prepayments and other current assets	`OtherAssetsCurrent`	$72.00M	USD	Point-in-time
Prepayments and other current assets	`OtherAssetsCurrent`	$77.00M	USD	Point-in-time
Total current assets	`AssetsCurrent`	$2.32B	USD	Point-in-time
Total current assets	`AssetsCurrent`	$2.60B	USD	Point-in-time
Plant, property, and equipment, gross	`PropertyPlantAndEquipmentGrossExcludingCWIP`	$18.94B	USD	Point-in-time
Plant, property, and equipment, gross	`PropertyPlantAndEquipmentGrossExcludingCWIP`	$16.18B	USD	Point-in-time
Plant, property, and equipment, gross	`PropertyPlantAndEquipmentGrossExcludingCWIP`	$17.72B	USD	Point-in-time
Less accumulated depreciation and amortization	`AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment`	$5.42B	USD	Point-in-time
Less accumulated depreciation and amortization	`AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment`	$5.75B	USD	Point-in-time
Plant, property, and equipment, net	`PropertyPlantAndEquipmentNetExcludingCWIP`	$13.20B	USD	Point-in-time
Plant, property, and equipment, net	`PropertyPlantAndEquipmentNetExcludingCWIP`	$12.31B	USD	Point-in-time
Construction work in progress	`ConstructionInProgressGross`	$1.11B	USD	Point-in-time
Construction work in progress	`ConstructionInProgressGross`	$1.51B	USD	Point-in-time
Total plant, property, and equipment	`PropertyPlantAndEquipmentNet`	$14.71B	USD	Point-in-time
Total plant, property, and equipment	`PropertyPlantAndEquipmentNet`	$13.41B	USD	Point-in-time
Regulatory assets	`RegulatoryAssetsNoncurrent`	$1.96B	USD	Point-in-time
Regulatory assets	`RegulatoryAssetsNoncurrent`	$1.84B	USD	Point-in-time
Accounts and notes receivable	`LongTermAccountsNotesAndLoansReceivableNetNoncurrent`	$1.03B	USD	Point-in-time
Accounts and notes receivable	`LongTermAccountsNotesAndLoansReceivableNetNoncurrent`	$807.00M	USD	Point-in-time
Investments	`EquityMethodInvestments`	$64.00M	USD	Point-in-time
Investments	`EquityMethodInvestments`	$59.00M	USD	Point-in-time
Investments	`EquityMethodInvestments`	$61.00M	USD	Point-in-time
Other	`OtherAssetsNoncurrent`	$384.00M	USD	Point-in-time
Other	`OtherAssetsNoncurrent`	$352.00M	USD	Point-in-time
Total other non-current assets	`AssetsNoncurrentOtherThanPropertyPlantAndEquipment`	$3.31B	USD	Point-in-time
Total other non-current assets	`AssetsNoncurrentOtherThanPropertyPlantAndEquipment`	$3.18B	USD	Point-in-time
Total Assets	`Assets`	$19.18B	USD	Point-in-time
Total Assets	`Assets`	$17.29B	USD	Point-in-time
Total Assets	`Assets`	$20.34B	USD	Point-in-time
Current portion of long-term debt, capital leases, and financing obligation	`DebtCurrent`	$540.00M	USD	Point-in-time
Current portion of long-term debt, capital leases, and financing obligation	`DebtCurrent`	$706.00M	USD	Point-in-time
Notes payable	`NotesPayableCurrent`	$60.00M	USD	Point-in-time
Notes payable	`NotesPayableCurrent`	$249.00M	USD	Point-in-time
Accounts payable	`AccountsPayableCurrent`	$678.00M	USD	Point-in-time
Accounts payable	`AccountsPayableCurrent`	$633.00M	USD	Point-in-time
Accounts payable - related parties, current	`DueToRelatedPartiesCurrent`	$9.00M	USD	Point-in-time
Accounts payable - related parties, current	`DueToRelatedPartiesCurrent`	$10.00M	USD	Point-in-time
Accrued rate refunds	`AccruedRateRefunds`	$26.00M	USD	Point-in-time
Accrued rate refunds	`AccruedRateRefunds`	$6.00M	USD	Point-in-time
Accrued interest	`InterestAndDividendsPayableCurrent`	$108.00M	USD	Point-in-time
Accrued interest	`InterestAndDividendsPayableCurrent`	$106.00M	USD	Point-in-time
Accrued taxes	`TaxesPayableCurrent`	$316.00M	USD	Point-in-time
Accrued taxes	`TaxesPayableCurrent`	$349.00M	USD	Point-in-time
Regulatory liabilities	`RegulatoryLiabilityCurrent`	$67.00M	USD	Point-in-time
Regulatory liabilities	`RegulatoryLiabilityCurrent`	$82.00M	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$163.00M	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$142.00M	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$2.30B	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$1.95B	USD	Point-in-time
Long-term debt	`LongTermDebtNoncurrent`	$8.44B	USD	Point-in-time
Long-term debt	`LongTermDebtNoncurrent`	$8.02B	USD	Point-in-time
Non-current portion of capital leases and financing obligation	`CapitalLeaseObligationsNoncurrent`	$123.00M	USD	Point-in-time
Non-current portion of capital leases and financing obligation	`CapitalLeaseObligationsNoncurrent`	$118.00M	USD	Point-in-time
Regulatory liabilities	`RegulatoryLiabilityNoncurrent`	$2.10B	USD	Point-in-time
Regulatory liabilities	`RegulatoryLiabilityNoncurrent`	$2.09B	USD	Point-in-time
Postretirement benefits	`PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent`	$872.00M	USD	Point-in-time
Postretirement benefits	`PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent`	$591.00M	USD	Point-in-time
Asset retirement obligations	`AssetRetirementObligationsNoncurrent`	$439.00M	USD	Point-in-time
Asset retirement obligations	`AssetRetirementObligationsNoncurrent`	$340.00M	USD	Point-in-time
Deferred investment tax credit	`AccumulatedDeferredInvestmentTaxCredit`	$56.00M	USD	Point-in-time
Deferred investment tax credit	`AccumulatedDeferredInvestmentTaxCredit`	$37.00M	USD	Point-in-time
Deferred income taxes	`DeferredTaxLiabilitiesNoncurrent`	$2.02B	USD	Point-in-time
Deferred income taxes	`DeferredTaxLiabilitiesNoncurrent`	$1.75B	USD	Point-in-time
Other non-current liabilities	`OtherLiabilitiesNoncurrent`	$313.00M	USD	Point-in-time
Other non-current liabilities	`OtherLiabilitiesNoncurrent`	$299.00M	USD	Point-in-time
Total non-current liabilities	`LiabilitiesNoncurrent`	$13.53B	USD	Point-in-time
Total non-current liabilities	`LiabilitiesNoncurrent`	$14.06B	USD	Point-in-time
Commitments and Contingencies (Notes 3, 4, and 5)	`CommitmentsAndContingencies`	-	USD	Point-in-time
Commitments and Contingencies (Notes 3, 4, and 5)	`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`	$4.77B	USD	Point-in-time
Other paid-in capital	`AdditionalPaidInCapitalCommonStock`	$4.84B	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-47.00M	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-49.00M	USD	Point-in-time
Retained earnings (Accumulated deficit)	`RetainedEarningsAccumulatedDeficit`	$-855.00M	USD	Point-in-time
Retained earnings (Accumulated deficit)	`RetainedEarningsAccumulatedDeficit`	$-1.06B	USD	Point-in-time
Total common stockholders' equity	`StockholdersEquity`	$3.67B	USD	Point-in-time
Total common stockholders' equity	`StockholdersEquity`	$3.94B	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`	$3.24B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.71B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.49B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.98B	USD	Point-in-time
Total Liabilities and Equity	`LiabilitiesAndStockholdersEquity`	$19.18B	USD	Point-in-time
Total Liabilities and Equity	`LiabilitiesAndStockholdersEquity`	$20.34B	USD	Point-in-time

Income Statement 133 line items

Line Item	Tag	Value	Unit	Period
Operating Revenue	`Revenues`	$1.49B	USD	1 Quarter
Operating Revenue	`Revenues`	$1.47B	USD	1 Quarter
Operating Revenue	`Revenues`	$2.11B	USD	1 Quarter
Operating Revenue	`Revenues`	$1.76B	USD	1 Quarter
Operating Revenue	`Revenues`	$7.18B	USD	Annual
Operating Revenue	`Revenues`	$6.46B	USD	Annual
Operating Revenue	`Revenues`	$1.51B	USD	1 Quarter
Operating Revenue	`Revenues`	$2.52B	USD	1 Quarter
Operating Revenue	`Revenues`	$1.43B	USD	1 Quarter
Operating Revenue	`Revenues`	$1.35B	USD	1 Quarter
Operating Revenue	`Revenues`	$6.57B	USD	Annual
Fuel for electric generation	`FuelCosts`	$593.00M	USD	Annual
Fuel for electric generation	`FuelCosts`	$621.00M	USD	Annual
Fuel for electric generation	`FuelCosts`	$673.00M	USD	Annual
Purchased and interchange power	`UtilitiesOperatingExpensePurchasedPower`	$1.41B	USD	Annual
Purchased and interchange power	`UtilitiesOperatingExpensePurchasedPower`	$1.60B	USD	Annual
Purchased and interchange power	`UtilitiesOperatingExpensePurchasedPower`	$1.39B	USD	Annual
Purchased power - related parties	`PurchasedPowerRelatedParties`	$83.00M	USD	Annual
Purchased power - related parties	`PurchasedPowerRelatedParties`	$90.00M	USD	Annual
Purchased power - related parties	`PurchasedPowerRelatedParties`	$90.00M	USD	Annual
Cost of gas sold	`CostOfNaturalGasPurchases`	$1.23B	USD	Annual
Cost of gas sold	`CostOfNaturalGasPurchases`	$1.49B	USD	Annual
Cost of gas sold	`CostOfNaturalGasPurchases`	$961.00M	USD	Annual
Maintenance and other operating expenses	`OtherCostAndExpenseOperating`	$1.23B	USD	Annual
Maintenance and other operating expenses	`OtherCostAndExpenseOperating`	$1.24B	USD	Annual
Maintenance and other operating expenses	`OtherCostAndExpenseOperating`	$1.24B	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$628.00M	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$685.00M	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$750.00M	USD	Annual
General taxes	`TaxesExcludingIncomeAndExciseTaxes`	$252.00M	USD	Annual
General taxes	`TaxesExcludingIncomeAndExciseTaxes`	$262.00M	USD	Annual
General taxes	`TaxesExcludingIncomeAndExciseTaxes`	$234.00M	USD	Annual
Total operating expenses	`CostsAndExpenses`	$5.29B	USD	Annual
Total operating expenses	`CostsAndExpenses`	$5.42B	USD	Annual
Total operating expenses	`CostsAndExpenses`	$6.03B	USD	Annual
Operating Income	`OperatingIncomeLoss`	$317.00M	USD	1 Quarter
Operating Income	`OperatingIncomeLoss`	$236.00M	USD	1 Quarter
Operating Income	`OperatingIncomeLoss`	$204.00M	USD	1 Quarter
Operating Income	`OperatingIncomeLoss`	$245.00M	USD	1 Quarter
Operating Income	`OperatingIncomeLoss`	$1.14B	USD	Annual
Operating Income	`OperatingIncomeLoss`	$273.00M	USD	1 Quarter
Operating Income	`OperatingIncomeLoss`	$235.00M	USD	1 Quarter
Operating Income	`OperatingIncomeLoss`	$408.00M	USD	1 Quarter
Operating Income	`OperatingIncomeLoss`	$1.15B	USD	Annual
Operating Income	`OperatingIncomeLoss`	$397.00M	USD	1 Quarter
Operating Income	`OperatingIncomeLoss`	$1.16B	USD	Annual
Interest income	`InvestmentIncomeInterestAndDividend`	$3.00M	USD	Annual
Interest income	`InvestmentIncomeInterestAndDividend`	$12.00M	USD	Annual
Interest income	`InvestmentIncomeInterestAndDividend`	$5.00M	USD	Annual
Allowance for equity funds used during construction	`PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity`	$8.00M	USD	Annual
Allowance for equity funds used during construction	`PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity`	$6.00M	USD	Annual
Allowance for equity funds used during construction	`PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity`	$10.00M	USD	Annual
Income from equity method investees	`IncomeLossFromEquityMethodInvestments`	$14.00M	USD	Annual
Income from equity method investees	`IncomeLossFromEquityMethodInvestments`	$13.00M	USD	Annual
Income from equity method investees	`IncomeLossFromEquityMethodInvestments`	$15.00M	USD	Annual
Other income	`OtherNonoperatingIncome`	$11.00M	USD	Annual
Other income	`OtherNonoperatingIncome`	$10.00M	USD	Annual
Other income	`OtherNonoperatingIncome`	$10.00M	USD	Annual
Other expense	`OtherNonoperatingExpense`	$17.00M	USD	Annual
Other expense	`OtherNonoperatingExpense`	$20.00M	USD	Annual
Other expense	`OtherNonoperatingExpense`	$55.00M	USD	Annual
Total other income (expense)	`NonoperatingIncomeExpense`	$-16.00M	USD	Annual
Total other income (expense)	`NonoperatingIncomeExpense`	$29.00M	USD	Annual
Total other income (expense)	`NonoperatingIncomeExpense`	$12.00M	USD	Annual
Interest on long-term debt	`InterestExpenseDebt`	$386.00M	USD	Annual
Interest on long-term debt	`InterestExpenseDebt`	$385.00M	USD	Annual
Interest on long-term debt	`InterestExpenseDebt`	$393.00M	USD	Annual
Other interest expense	`InterestExpenseOther`	$16.00M	USD	Annual
Other interest expense	`InterestExpenseOther`	$17.00M	USD	Annual
Other interest expense	`InterestExpenseOther`	$14.00M	USD	Annual
Allowance for borrowed funds used during construction	`InterestCostsCapitalizedAdjustment`	$3.00M	USD	Annual
Allowance for borrowed funds used during construction	`InterestCostsCapitalizedAdjustment`	$4.00M	USD	Annual
Allowance for borrowed funds used during construction	`InterestCostsCapitalizedAdjustment`	$3.00M	USD	Annual
Total interest charges	`InterestExpense`	$396.00M	USD	Annual
Total interest charges	`InterestExpense`	$398.00M	USD	Annual
Total interest charges	`InterestExpense`	$407.00M	USD	Annual
Income Before Income Taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$729.00M	USD	Annual
Income Before Income Taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$796.00M	USD	Annual
Income Before Income Taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$756.00M	USD	Annual
Income Tax Expense	`IncomeTaxExpenseBenefit`	$302.00M	USD	Annual
Income Tax Expense	`IncomeTaxExpenseBenefit`	$250.00M	USD	Annual
Income Tax Expense	`IncomeTaxExpenseBenefit`	$271.00M	USD	Annual
Net Income	`ProfitLoss`	$84.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$525.00M	USD	Annual
Net Income	`ProfitLoss`	$148.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$479.00M	USD	Annual
Net Income	`ProfitLoss`	$94.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$68.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$97.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$202.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$204.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$454.00M	USD	Annual
Net Income	`ProfitLoss`	$107.00M	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`	$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`	$1.00M	USD	1 Quarter
Income Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$2.00M	USD	Annual
Net Income Available to Common Stockholders	`NetIncomeLoss`	$202.00M	USD	1 Quarter
Net Income Available to Common Stockholders	`NetIncomeLoss`	$523.00M	USD	Annual
Net Income Available to Common Stockholders	`NetIncomeLoss`	$67.00M	USD	1 Quarter
Net Income Available to Common Stockholders	`NetIncomeLoss`	$94.00M	USD	1 Quarter
Net Income Available to Common Stockholders	`NetIncomeLoss`	$148.00M	USD	1 Quarter
Net Income Available to Common Stockholders	`NetIncomeLoss`	$96.00M	USD	1 Quarter
Net Income Available to Common Stockholders	`NetIncomeLoss`	$204.00M	USD	1 Quarter
Net Income Available to Common Stockholders	`NetIncomeLoss`	$83.00M	USD	1 Quarter
Net Income Available to Common Stockholders	`NetIncomeLoss`	$477.00M	USD	Annual
Net Income Available to Common Stockholders	`NetIncomeLoss`	$452.00M	USD	Annual
Net Income Available to Common Stockholders	`NetIncomeLoss`	$106.00M	USD	1 Quarter
Basic Earnings Per Average Common Share	`EarningsPerShareBasic`	$1.71	USD	Annual
Basic Earnings Per Average Common Share	`EarningsPerShareBasic`	$0.77	USD	1 Quarter
Basic Earnings Per Average Common Share	`EarningsPerShareBasic`	$0.73	USD	1 Quarter
Basic Earnings Per Average Common Share	`EarningsPerShareBasic`	$0.53	USD	1 Quarter
Basic Earnings Per Average Common Share	`EarningsPerShareBasic`	$0.31	USD	1 Quarter
Basic Earnings Per Average Common Share	`EarningsPerShareBasic`	$0.39	USD	1 Quarter
Basic Earnings Per Average Common Share	`EarningsPerShareBasic`	$1.90	USD	Annual
Basic Earnings Per Average Common Share	`EarningsPerShareBasic`	$0.34	USD	1 Quarter
Basic Earnings Per Average Common Share	`EarningsPerShareBasic`	$0.25	USD	1 Quarter
Basic Earnings Per Average Common Share	`EarningsPerShareBasic`	$1.76	USD	Annual
Basic Earnings Per Average Common Share	`EarningsPerShareBasic`	$0.35	USD	1 Quarter
Diluted Earnings Per Average Common Share	`EarningsPerShareDiluted`	$1.74	USD	Annual
Diluted Earnings Per Average Common Share	`EarningsPerShareDiluted`	$0.75	USD	1 Quarter
Diluted Earnings Per Average Common Share	`EarningsPerShareDiluted`	$0.34	USD	1 Quarter
Diluted Earnings Per Average Common Share	`EarningsPerShareDiluted`	$0.38	USD	1 Quarter
Diluted Earnings Per Average Common Share	`EarningsPerShareDiluted`	$1.89	USD	Annual
Diluted Earnings Per Average Common Share	`EarningsPerShareDiluted`	$0.53	USD	1 Quarter
Diluted Earnings Per Average Common Share	`EarningsPerShareDiluted`	$1.66	USD	Annual
Diluted Earnings Per Average Common Share	`EarningsPerShareDiluted`	$0.25	USD	1 Quarter
Diluted Earnings Per Average Common Share	`EarningsPerShareDiluted`	$0.35	USD	1 Quarter
Diluted Earnings Per Average Common Share	`EarningsPerShareDiluted`	$0.73	USD	1 Quarter
Diluted Earnings Per Average Common Share	`EarningsPerShareDiluted`	$0.30	USD	1 Quarter

Cash Flow Statement 109 line items

Line Item	Tag	Value	Unit	Period
Net income	`ProfitLoss`	$84.00M	USD	1 Quarter
Net income	`ProfitLoss`	$525.00M	USD	Annual
Net income	`ProfitLoss`	$148.00M	USD	1 Quarter
Net income	`ProfitLoss`	$479.00M	USD	Annual
Net income	`ProfitLoss`	$94.00M	USD	1 Quarter
Net income	`ProfitLoss`	$68.00M	USD	1 Quarter
Net income	`ProfitLoss`	$97.00M	USD	1 Quarter
Net income	`ProfitLoss`	$202.00M	USD	1 Quarter
Net income	`ProfitLoss`	$204.00M	USD	1 Quarter
Net income	`ProfitLoss`	$454.00M	USD	Annual
Net income	`ProfitLoss`	$107.00M	USD	1 Quarter
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$628.00M	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$685.00M	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$750.00M	USD	Annual
Deferred income taxes and investment tax credit	`DeferredIncomeTaxesAndTaxCredits`	$247.00M	USD	Annual
Deferred income taxes and investment tax credit	`DeferredIncomeTaxesAndTaxCredits`	$268.00M	USD	Annual
Deferred income taxes and investment tax credit	`DeferredIncomeTaxesAndTaxCredits`	$227.00M	USD	Annual
Postretirement benefits expense	`PensionAndOtherPostretirementBenefitExpense`	$91.00M	USD	Annual
Postretirement benefits expense	`PensionAndOtherPostretirementBenefitExpense`	$23.00M	USD	Annual
Postretirement benefits expense	`PensionAndOtherPostretirementBenefitExpense`	$144.00M	USD	Annual
Bad debt expense	`ProvisionForDoubtfulAccounts`	$58.00M	USD	Annual
Bad debt expense	`ProvisionForDoubtfulAccounts`	$80.00M	USD	Annual
Bad debt expense	`ProvisionForDoubtfulAccounts`	$67.00M	USD	Annual
Other non-cash operating activities	`OtherNoncashIncomeExpense`	$-9.00M	USD	Annual
Other non-cash operating activities	`OtherNoncashIncomeExpense`	$-22.00M	USD	Annual
Other non-cash operating activities	`OtherNoncashIncomeExpense`	$-17.00M	USD	Annual
Postretirement benefits contributions	`PensionAndOtherPostretirementBenefitContributions`	$262.00M	USD	Annual
Postretirement benefits contributions	`PensionAndOtherPostretirementBenefitContributions`	$229.00M	USD	Annual
Postretirement benefits contributions	`PensionAndOtherPostretirementBenefitContributions`	$32.00M	USD	Annual
Proceeds from government grant	`ProceedsFromGovernmentGrant`	$69.00M	USD	Annual
Decrease (increase) in accounts receivable, notes receivable, and accrued revenue	`IncreaseDecreaseInAccountsAndOtherReceivables`	$-120.00M	USD	Annual
Decrease (increase) in accounts receivable, notes receivable, and accrued revenue	`IncreaseDecreaseInAccountsAndOtherReceivables`	$120.00M	USD	Annual
Decrease (increase) in accounts receivable, notes receivable, and accrued revenue	`IncreaseDecreaseInAccountsAndOtherReceivables`	$31.00M	USD	Annual
Decrease (increase) in inventories	`IncreaseDecreaseInInventories`	$36.00M	USD	Annual
Decrease (increase) in inventories	`IncreaseDecreaseInInventories`	$-147.00M	USD	Annual
Decrease (increase) in inventories	`IncreaseDecreaseInInventories`	$-202.00M	USD	Annual
Increase (decrease) in accounts payable and accrued refunds	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$4.00M	USD	Annual
Increase (decrease) in accounts payable and accrued refunds	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$-26.00M	USD	Annual
Increase (decrease) in accounts payable and accrued refunds	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$50.00M	USD	Annual
Other current and non-current assets and liabilities	`IncreaseDecreaseInOtherOperatingCapitalNet`	$88.00M	USD	Annual
Other current and non-current assets and liabilities	`IncreaseDecreaseInOtherOperatingCapitalNet`	$19.00M	USD	Annual
Other current and non-current assets and liabilities	`IncreaseDecreaseInOtherOperatingCapitalNet`	$15.00M	USD	Annual
Net cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivitiesContinuingOperations`	$1.42B	USD	Annual
Net cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivitiesContinuingOperations`	$1.45B	USD	Annual
Net cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivitiesContinuingOperations`	$1.64B	USD	Annual
Capital expenditures (excludes assets placed under capital lease)	`PaymentsToAcquirePropertyPlantAndEquipment`	$1.32B	USD	Annual
Capital expenditures (excludes assets placed under capital lease)	`PaymentsToAcquirePropertyPlantAndEquipment`	$1.58B	USD	Annual
Capital expenditures (excludes assets placed under capital lease)	`PaymentsToAcquirePropertyPlantAndEquipment`	$1.56B	USD	Annual
Jackson plant acquisition	`PaymentsToAcquireBusinessNetOfAcquisitionCosts`	$154.00M	USD	Annual
Cost to retire property	`PaymentsForProceedsFromRemovalCosts`	$75.00M	USD	Annual
Cost to retire property	`PaymentsForProceedsFromRemovalCosts`	$56.00M	USD	Annual
Cost to retire property	`PaymentsForProceedsFromRemovalCosts`	$89.00M	USD	Annual
Increase in EnerBank notes receivable	`PaymentsForProceedsFromLoansAndLeases`	$139.00M	USD	Annual
Increase in EnerBank notes receivable	`PaymentsForProceedsFromLoansAndLeases`	$255.00M	USD	Annual
Increase in EnerBank notes receivable	`PaymentsForProceedsFromLoansAndLeases`	$279.00M	USD	Annual
Proceeds from the sale of EnerBank notes receivable	`ProceedsFromSaleOfNotesReceivable`	$48.00M	USD	Annual
Other investing activities	`PaymentsForProceedsFromOtherInvestingActivities`	$6.00M	USD	Annual
Other investing activities	`PaymentsForProceedsFromOtherInvestingActivities`	$3.00M	USD	Annual
Other investing activities	`PaymentsForProceedsFromOtherInvestingActivities`	$12.00M	USD	Annual
Net cash used in investing activities	`NetCashProvidedByUsedInInvestingActivitiesContinuingOperations`	$-2.04B	USD	Annual
Net cash used in investing activities	`NetCashProvidedByUsedInInvestingActivitiesContinuingOperations`	$-1.91B	USD	Annual
Net cash used in investing activities	`NetCashProvidedByUsedInInvestingActivitiesContinuingOperations`	$-1.53B	USD	Annual
Proceeds from issuance of debt	`ProceedsFromIssuanceOfLongTermDebt`	$1.02B	USD	Annual
Proceeds from issuance of debt	`ProceedsFromIssuanceOfLongTermDebt`	$1.43B	USD	Annual
Proceeds from issuance of debt	`ProceedsFromIssuanceOfLongTermDebt`	$599.00M	USD	Annual
Net increase in EnerBank certificates of deposit	`ProceedsFromRepaymentsOfNotesPayable`	$214.00M	USD	Annual
Net increase in EnerBank certificates of deposit	`ProceedsFromRepaymentsOfNotesPayable`	$233.00M	USD	Annual
Net increase in EnerBank certificates of deposit	`ProceedsFromRepaymentsOfNotesPayable`	$125.00M	USD	Annual
Issuance of common stock	`ProceedsFromIssuanceOfCommonStock`	$43.00M	USD	Annual
Issuance of common stock	`ProceedsFromIssuanceOfCommonStock`	$36.00M	USD	Annual
Issuance of common stock	`ProceedsFromIssuanceOfCommonStock`	$43.00M	USD	Annual
Retirement of long-term debt	`RepaymentsOfLongTermDebt`	$224.00M	USD	Annual
Retirement of long-term debt	`RepaymentsOfLongTermDebt`	$750.00M	USD	Annual
Retirement of long-term debt	`RepaymentsOfLongTermDebt`	$741.00M	USD	Annual
Payment of dividends on common and preferred stock	`PaymentsOfOrdinaryDividends`	$322.00M	USD	Annual
Payment of dividends on common and preferred stock	`PaymentsOfOrdinaryDividends`	$295.00M	USD	Annual
Payment of dividends on common and preferred stock	`PaymentsOfOrdinaryDividends`	$273.00M	USD	Annual
Increase (decrease) in notes payable	`ProceedsFromRepaymentsOfShortTermDebt`	$60.00M	USD	Annual
Increase (decrease) in notes payable	`ProceedsFromRepaymentsOfShortTermDebt`	$189.00M	USD	Annual
Increase (decrease) in notes payable	`ProceedsFromRepaymentsOfShortTermDebt`	$-110.00M	USD	Annual
Payment of capital lease obligations and other financing costs	`ProceedsFromPaymentsForOtherFinancingActivities`	$-42.00M	USD	Annual
Payment of capital lease obligations and other financing costs	`ProceedsFromPaymentsForOtherFinancingActivities`	$-36.00M	USD	Annual
Payment of capital lease obligations and other financing costs	`ProceedsFromPaymentsForOtherFinancingActivities`	$-51.00M	USD	Annual
Net cash provided by financing activities	`NetCashProvidedByUsedInFinancingActivitiesContinuingOperations`	$498.00M	USD	Annual
Net cash provided by financing activities	`NetCashProvidedByUsedInFinancingActivitiesContinuingOperations`	$463.00M	USD	Annual
Net cash provided by financing activities	`NetCashProvidedByUsedInFinancingActivitiesContinuingOperations`	$190.00M	USD	Annual
Net Increase in Cash and Cash Equivalents	`CashAndCashEquivalentsPeriodIncreaseDecrease`	$59.00M	USD	Annual
Net Increase in Cash and Cash Equivalents	`CashAndCashEquivalentsPeriodIncreaseDecrease`	$35.00M	USD	Annual
Net Increase in Cash and Cash Equivalents	`CashAndCashEquivalentsPeriodIncreaseDecrease`	$79.00M	USD	Annual
Cash and Cash Equivalents, Beginning of Period	`CashAndCashEquivalentsAtCarryingValue`	$93.00M	USD	Point-in-time
Cash and Cash Equivalents, Beginning of Period	`CashAndCashEquivalentsAtCarryingValue`	$172.00M	USD	Point-in-time
Cash and Cash Equivalents, Beginning of Period	`CashAndCashEquivalentsAtCarryingValue`	$207.00M	USD	Point-in-time
Cash and Cash Equivalents, Beginning of Period	`CashAndCashEquivalentsAtCarryingValue`	$266.00M	USD	Point-in-time
Cash and Cash Equivalents, End of Period	`CashAndCashEquivalentsAtCarryingValue`	$93.00M	USD	Point-in-time
Cash and Cash Equivalents, End of Period	`CashAndCashEquivalentsAtCarryingValue`	$172.00M	USD	Point-in-time
Cash and Cash Equivalents, End of Period	`CashAndCashEquivalentsAtCarryingValue`	$207.00M	USD	Point-in-time
Cash and Cash Equivalents, End of Period	`CashAndCashEquivalentsAtCarryingValue`	$266.00M	USD	Point-in-time
Interest paid (net of amounts capitalized)	`InterestPaidNet`	$382.00M	USD	Annual
Interest paid (net of amounts capitalized)	`InterestPaidNet`	$380.00M	USD	Annual
Interest paid (net of amounts capitalized)	`InterestPaidNet`	$386.00M	USD	Annual
Income taxes paid (refunds received), net	`IncomeTaxesPaidNet`	$34.00M	USD	Annual
Income taxes paid (refunds received), net	`IncomeTaxesPaidNet`	$10.00M	USD	Annual
Income taxes paid (refunds received), net	`IncomeTaxesPaidNet`	$22.00M	USD	Annual
Capital expenditures not paid	`CapitalExpendituresIncurredButNotYetPaid`	$201.00M	USD	Annual
Capital expenditures not paid	`CapitalExpendituresIncurredButNotYetPaid`	$176.00M	USD	Annual
Capital expenditures not paid	`CapitalExpendituresIncurredButNotYetPaid`	$201.00M	USD	Annual
Other assets placed under capital lease	`CapitalLeaseObligationsIncurred`	$6.00M	USD	Annual
Other assets placed under capital lease	`CapitalLeaseObligationsIncurred`	$17.00M	USD	Annual
Other assets placed under capital lease	`CapitalLeaseObligationsIncurred`	$7.00M	USD	Annual

Stockholders Equity 54 line items

Line Item	Tag	Value	Unit	Period
Total Equity, beginning	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.24B	USD	Point-in-time
Total Equity, beginning	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.71B	USD	Point-in-time
Total Equity, beginning	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.49B	USD	Point-in-time
Total Equity, beginning	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.98B	USD	Point-in-time
Beginning of period, shares	`CommonStockSharesOutstanding`	275.20M	shares	Point-in-time
Beginning of period, shares	`CommonStockSharesOutstanding`	277.20M	shares	Point-in-time
Net gain arising during the period	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	$1.00M	USD	Annual
Net gain arising during the period	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	$26.00M	USD	Annual
Net gain arising during the period	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	$-29.00M	USD	Annual
Prior service credit adjustment	`OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax`	$-5.00M	USD	Annual
Amortization of net actuarial loss (gain)	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax`	$-4.00M	USD	Annual
Amortization of net actuarial loss (gain)	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax`	$-5.00M	USD	Annual
Amortization of net actuarial loss (gain)	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax`	$-3.00M	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, net of tax	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$-1.00M	USD	Annual
Unrealized gain (loss) on investments, net of tax	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$-2.00M	USD	Annual
Unrealized gain (loss) on investments, net of tax	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$-3.00M	USD	Annual
Reclassification adjustments included in net income	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax`	$-1.00M	USD	Annual
Net income (loss) attributable to CMS Energy	`NetIncomeLoss`	$202.00M	USD	1 Quarter
Net income (loss) attributable to CMS Energy	`NetIncomeLoss`	$523.00M	USD	Annual
Net income (loss) attributable to CMS Energy	`NetIncomeLoss`	$67.00M	USD	1 Quarter
Net income (loss) attributable to CMS Energy	`NetIncomeLoss`	$94.00M	USD	1 Quarter
Net income (loss) attributable to CMS Energy	`NetIncomeLoss`	$148.00M	USD	1 Quarter
Net income (loss) attributable to CMS Energy	`NetIncomeLoss`	$96.00M	USD	1 Quarter
Net income (loss) attributable to CMS Energy	`NetIncomeLoss`	$204.00M	USD	1 Quarter
Net income (loss) attributable to CMS Energy	`NetIncomeLoss`	$83.00M	USD	1 Quarter
Net income (loss) attributable to CMS Energy	`NetIncomeLoss`	$477.00M	USD	Annual
Net income (loss) attributable to CMS Energy	`NetIncomeLoss`	$452.00M	USD	Annual
Net income (loss) attributable to CMS Energy	`NetIncomeLoss`	$106.00M	USD	1 Quarter
Net income	`ProfitLoss`	$84.00M	USD	1 Quarter
Net income	`ProfitLoss`	$525.00M	USD	Annual
Net income	`ProfitLoss`	$148.00M	USD	1 Quarter
Net income	`ProfitLoss`	$479.00M	USD	Annual
Net income	`ProfitLoss`	$94.00M	USD	1 Quarter
Net income	`ProfitLoss`	$68.00M	USD	1 Quarter
Net income	`ProfitLoss`	$97.00M	USD	1 Quarter
Net income	`ProfitLoss`	$202.00M	USD	1 Quarter
Net income	`ProfitLoss`	$204.00M	USD	1 Quarter
Net income	`ProfitLoss`	$454.00M	USD	Annual
Net income	`ProfitLoss`	$107.00M	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`	$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`	$1.00M	USD	1 Quarter
Income Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$2.00M	USD	Annual
End of period, shares	`CommonStockSharesOutstanding`	275.20M	shares	Point-in-time
End of period, shares	`CommonStockSharesOutstanding`	277.20M	shares	Point-in-time
Total Equity, end	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.24B	USD	Point-in-time
Total Equity, end	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.71B	USD	Point-in-time
Total Equity, end	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.49B	USD	Point-in-time
Total Equity, end	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$3.98B	USD	Point-in-time

Comprehensive Income 48 line items

Line Item	Tag	Value	Unit	Period
Net gain (loss) arising during the period, tax	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax`	$-18.00M	USD	Annual
Net income	`ProfitLoss`	$84.00M	USD	1 Quarter
Net income	`ProfitLoss`	$525.00M	USD	Annual
Net income	`ProfitLoss`	$148.00M	USD	1 Quarter
Net income	`ProfitLoss`	$479.00M	USD	Annual
Net income	`ProfitLoss`	$94.00M	USD	1 Quarter
Net income	`ProfitLoss`	$68.00M	USD	1 Quarter
Net income	`ProfitLoss`	$97.00M	USD	1 Quarter
Net income	`ProfitLoss`	$202.00M	USD	1 Quarter
Net income	`ProfitLoss`	$204.00M	USD	1 Quarter
Net gain (loss) arising during the period, tax	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax`	$16.00M	USD	Annual
Net income	`ProfitLoss`	$454.00M	USD	Annual
Net income	`ProfitLoss`	$107.00M	USD	1 Quarter
Tax on prior service credit adjustment	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBenefitPlanImprovementTaxEffect`	$3.00M	USD	Annual
Net gain (loss) arising during the period, net of tax	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	$1.00M	USD	Annual
Net gain (loss) arising during the period, net of tax	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	$26.00M	USD	Annual
Amortization of net actuarial loss, tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax`	$1.00M	USD	Annual
Net gain (loss) arising during the period, net of tax	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	$-29.00M	USD	Annual
Amortization of net actuarial loss, tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax`	$3.00M	USD	Annual
Amortization of net actuarial loss, tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax`	$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
Prior service credit adjustment, net of tax	`OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax`	$-5.00M	USD	Annual
Amortization of net actuarial loss (gain), net of tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax`	$-4.00M	USD	Annual
Amortization of net actuarial loss (gain), net of tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax`	$-5.00M	USD	Annual
Unrealized gain (loss) on investments, tax expense (tax benefit)	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax`	$-1.00M	USD	Annual
Unrealized gain (loss) on investments, tax expense (tax benefit)	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax`	$-1.00M	USD	Annual
Amortization of net actuarial loss (gain), net of tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax`	$-3.00M	USD	Annual
Unrealized gain (loss) on investments, tax expense (tax benefit)	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax`	$-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
Unrealized gain (loss) on investments, net of tax	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$-1.00M	USD	Annual
Unrealized gain (loss) on investments, net of tax	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$-2.00M	USD	Annual
Unrealized gain (loss) on investments, net of tax	`OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax`	$-3.00M	USD	Annual
Reclassification adjustments included in net income, net of tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax`	$-1.00M	USD	Annual
Other Comprehensive Income (Loss)	`OtherComprehensiveIncomeLossNetOfTax`	$2.00M	USD	Annual
Other Comprehensive Income (Loss)	`OtherComprehensiveIncomeLossNetOfTax`	$33.00M	USD	Annual
Other Comprehensive Income (Loss)	`OtherComprehensiveIncomeLossNetOfTax`	$-27.00M	USD	Annual
Comprehensive Income	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$487.00M	USD	Annual
Comprehensive Income	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$527.00M	USD	Annual
Comprehensive Income	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$452.00M	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`	$485.00M	USD	Annual
Comprehensive Income Attributable to CMS Energy	`ComprehensiveIncomeNetOfTax`	$525.00M	USD	Annual
Comprehensive Income Attributable to CMS Energy	`ComprehensiveIncomeNetOfTax`	$450.00M	USD	Annual

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