10-K Filing

CMS ENERGY CORP CIK: 811156 FY 2020

Filing Information

Form Type	10-K
Accession Number	`0000811156-21-000016`
Period End Date	20201231
Filing Date	20210211
Fiscal Year	2020
Fiscal Period	FY
XBRL Instance	cms-20201231_htm.xml

Filing Contents

This filing contains the following financial statements:

Balance Sheet 117 Income Statement 140 Cash Flow Statement 118 Stockholders Equity 47 Comprehensive Income 65

Balance Sheet 117 line items

Line Item	Tag	Value	Unit	Period
Accounts receivable and accrued revenue, ALLOWANCE	`AllowanceForDoubtfulAccountsReceivableCurrent`	$29.00M	USD	Point-in-time
Accounts receivable and accrued revenue, ALLOWANCE	`AllowanceForDoubtfulAccountsReceivableCurrent`	$20.00M	USD	Point-in-time
Notes receivable, ALLOWANCE	`AllowanceForNotesAndLoansReceivableCurrent`	$32.00M	USD	Point-in-time
Notes receivable, ALLOWANCE	`AllowanceForNotesAndLoansReceivableCurrent`	$33.00M	USD	Point-in-time
Accounts and notes receivable, ALLOWANCE	`AllowanceForNotesAndLoansReceivableNoncurrent`	$91.00M	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$168.00M	USD	Point-in-time
Accounts and notes receivable, ALLOWANCE	`AllowanceForNotesAndLoansReceivableNoncurrent`	-	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$140.00M	USD	Point-in-time
Restricted cash and cash equivalents	`RestrictedCashAndCashEquivalentsAtCarryingValue`	$17.00M	USD	Point-in-time
Common stock authorized (in shares)	`CommonStockSharesAuthorized`	350.00M	shares	Point-in-time
Common stock authorized (in shares)	`CommonStockSharesAuthorized`	350.00M	shares	Point-in-time
Restricted cash and cash equivalents	`RestrictedCashAndCashEquivalentsAtCarryingValue`	$17.00M	USD	Point-in-time
Accounts receivable and accrued revenue, less allowance of $29 in 2020 and $20 in 2019	`AccountsReceivableNetCurrent`	$886.00M	USD	Point-in-time
Common stock outstanding (in shares)	`CommonStockSharesOutstanding`	288.90M	shares	Point-in-time
Common stock outstanding (in shares)	`CommonStockSharesOutstanding`	283.90M	shares	Point-in-time
Accounts receivable and accrued revenue, less allowance of $29 in 2020 and $20 in 2019	`AccountsReceivableNetCurrent`	$863.00M	USD	Point-in-time
Notes receivable, less allowance of $32 in 2020 and $33 in 2019	`NotesAndLoansReceivableNetCurrent`	$242.00M	USD	Point-in-time
Notes receivable, less allowance of $32 in 2020 and $33 in 2019	`NotesAndLoansReceivableNetCurrent`	$275.00M	USD	Point-in-time
Accounts receivable related parties	`DueFromRelatedPartiesCurrent`	$17.00M	USD	Point-in-time
Accounts receivable related parties	`DueFromRelatedPartiesCurrent`	$19.00M	USD	Point-in-time
Gas in underground storage	`EnergyRelatedInventoryGasStoredUnderground`	$399.00M	USD	Point-in-time
Gas in underground storage	`EnergyRelatedInventoryGasStoredUnderground`	$353.00M	USD	Point-in-time
Materials and supplies	`OtherInventorySupplies`	$155.00M	USD	Point-in-time
Materials and supplies	`OtherInventorySupplies`	$140.00M	USD	Point-in-time
Generating plant fuel stock	`EnergyRelatedInventoryOtherFossilFuel`	$68.00M	USD	Point-in-time
Generating plant fuel stock	`EnergyRelatedInventoryOtherFossilFuel`	$66.00M	USD	Point-in-time
Deferred property taxes	`DeferredPropertyTaxes`	$305.00M	USD	Point-in-time
Deferred property taxes	`DeferredPropertyTaxes`	$332.00M	USD	Point-in-time
Regulatory assets	`RegulatoryAssetsCurrent`	$33.00M	USD	Point-in-time
Regulatory assets	`RegulatoryAssetsCurrent`	$42.00M	USD	Point-in-time
Prepayments and other current assets	`OtherAssetsCurrent`	$86.00M	USD	Point-in-time
Prepayments and other current assets	`OtherAssetsCurrent`	$112.00M	USD	Point-in-time
Total current assets	`AssetsCurrent`	$2.40B	USD	Point-in-time
Total current assets	`AssetsCurrent`	$2.33B	USD	Point-in-time
Plant, property, and equipment, gross	`PropertyPlantAndEquipmentGrossExcludingCWIP`	$27.91B	USD	Point-in-time
Plant, property, and equipment, gross	`PropertyPlantAndEquipmentGrossExcludingCWIP`	$25.39B	USD	Point-in-time
Plant, property, and equipment, gross	`PropertyPlantAndEquipmentGrossExcludingCWIP`	$24.40B	USD	Point-in-time
Less accumulated depreciation and amortization	`AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment`	$7.36B	USD	Point-in-time
Less accumulated depreciation and amortization	`AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment`	$7.95B	USD	Point-in-time
Plant, property, and equipment, net	`PropertyPlantAndEquipmentNetExcludingCWIP`	$18.03B	USD	Point-in-time
Plant, property, and equipment, net	`PropertyPlantAndEquipmentNetExcludingCWIP`	$19.95B	USD	Point-in-time
Construction work in progress	`ConstructionInProgressGross`	$1.08B	USD	Point-in-time
Construction work in progress	`ConstructionInProgressGross`	$896.00M	USD	Point-in-time
Total plant, property, and equipment	`PropertyPlantAndEquipmentNet`	$18.93B	USD	Point-in-time
Total plant, property, and equipment	`PropertyPlantAndEquipmentNet`	$21.04B	USD	Point-in-time
Regulatory assets	`RegulatoryAssetsNoncurrent`	$2.65B	USD	Point-in-time
Regulatory assets	`RegulatoryAssetsNoncurrent`	$2.49B	USD	Point-in-time
Accounts and notes receivable, less allowance of $91 in 2020 and $ in 2019	`LongTermAccountsNotesAndLoansReceivableNetNoncurrent`	$2.28B	USD	Point-in-time
Accounts and notes receivable, less allowance of $91 in 2020 and $ in 2019	`LongTermAccountsNotesAndLoansReceivableNetNoncurrent`	$2.63B	USD	Point-in-time
Investments	`EquityMethodInvestments`	$70.00M	USD	Point-in-time
Investments	`EquityMethodInvestments`	$69.00M	USD	Point-in-time
Investments	`EquityMethodInvestments`	$71.00M	USD	Point-in-time
Other	`OtherAssetsNoncurrent`	$869.00M	USD	Point-in-time
Other	`OtherAssetsNoncurrent`	$739.00M	USD	Point-in-time
Total other non-current assets	`AssetsNoncurrentOtherThanPropertyPlantAndEquipment`	$6.22B	USD	Point-in-time
Total other non-current assets	`AssetsNoncurrentOtherThanPropertyPlantAndEquipment`	$5.58B	USD	Point-in-time
Total Assets	`Assets`	$24.53B	USD	Point-in-time
Total Assets	`Assets`	$29.67B	USD	Point-in-time
Total Assets	`Assets`	$26.84B	USD	Point-in-time
Current portion of long-term debt, finance leases, and other financing	`LongTermDebtCurrentMaturitiesLeaseObligationCurrentAndOtherFinancingCurrent`	$1.13B	USD	Point-in-time
Current portion of long-term debt, finance leases, and other financing	`LongTermDebtCurrentMaturitiesLeaseObligationCurrentAndOtherFinancingCurrent`	$1.51B	USD	Point-in-time
Notes payable	`NotesPayableCurrent`	$90.00M	USD	Point-in-time
Notes payable	`NotesPayableCurrent`	-	USD	Point-in-time
Accounts payable	`AccountsPayableCurrent`	$622.00M	USD	Point-in-time
Accounts payable	`AccountsPayableCurrent`	$671.00M	USD	Point-in-time
Accounts payable related parties	`DueToRelatedPartiesCurrent`	$13.00M	USD	Point-in-time
Accounts payable related parties	`DueToRelatedPartiesCurrent`	$7.00M	USD	Point-in-time
Accrued rate refunds	`AccruedRateRefunds`	$35.00M	USD	Point-in-time
Accrued rate refunds	`AccruedRateRefunds`	$20.00M	USD	Point-in-time
Accrued interest	`InterestAndDividendsPayableCurrent`	$104.00M	USD	Point-in-time
Accrued interest	`InterestAndDividendsPayableCurrent`	$106.00M	USD	Point-in-time
Accrued taxes	`TaxesPayableCurrent`	$437.00M	USD	Point-in-time
Accrued taxes	`TaxesPayableCurrent`	$457.00M	USD	Point-in-time
Regulatory liabilities	`RegulatoryLiabilityCurrent`	$151.00M	USD	Point-in-time
Regulatory liabilities	`RegulatoryLiabilityCurrent`	$87.00M	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$186.00M	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$156.00M	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$3.07B	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$2.70B	USD	Point-in-time
Long-term debt	`LongTermDebtNoncurrent`	$13.63B	USD	Point-in-time
Long-term debt	`LongTermDebtNoncurrent`	$11.95B	USD	Point-in-time
Non-current portion of finance leases and other financing	`FinanceLeaseLiabilityAndOtherNoncurrent`	$76.00M	USD	Point-in-time
Non-current portion of finance leases and other financing	`FinanceLeaseLiabilityAndOtherNoncurrent`	$56.00M	USD	Point-in-time
Regulatory liabilities	`RegulatoryLiabilityNoncurrent`	$3.74B	USD	Point-in-time
Regulatory liabilities	`RegulatoryLiabilityNoncurrent`	$3.74B	USD	Point-in-time
Postretirement benefits	`PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent`	$674.00M	USD	Point-in-time
Postretirement benefits	`PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent`	$152.00M	USD	Point-in-time
Asset retirement obligations	`AssetRetirementObligationsNoncurrent`	$553.00M	USD	Point-in-time
Asset retirement obligations	`AssetRetirementObligationsNoncurrent`	$477.00M	USD	Point-in-time
Deferred investment tax credit	`AccumulatedDeferredInvestmentTaxCredit`	$115.00M	USD	Point-in-time
Deferred investment tax credit	`AccumulatedDeferredInvestmentTaxCredit`	$120.00M	USD	Point-in-time
Deferred income taxes	`DeferredIncomeTaxLiabilitiesNet`	$1.86B	USD	Point-in-time
Deferred income taxes	`DeferredIncomeTaxLiabilitiesNet`	$1.66B	USD	Point-in-time
Other non-current liabilities	`OtherLiabilitiesNoncurrent`	$398.00M	USD	Point-in-time
Other non-current liabilities	`OtherLiabilitiesNoncurrent`	$383.00M	USD	Point-in-time
Total non-current liabilities	`LiabilitiesNoncurrent`	$19.08B	USD	Point-in-time
Total non-current liabilities	`LiabilitiesNoncurrent`	$20.52B	USD	Point-in-time
Commitments and Contingencies	`CommitmentsAndContingencies`	-	USD	Point-in-time
Commitments and Contingencies	`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`	$5.11B	USD	Point-in-time
Other paid-in capital	`AdditionalPaidInCapitalCommonStock`	$5.37B	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-73.00M	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-86.00M	USD	Point-in-time
Retained earnings (accumulated deficit)	`RetainedEarningsAccumulatedDeficit`	$-25.00M	USD	Point-in-time
Retained earnings (accumulated deficit)	`RetainedEarningsAccumulatedDeficit`	$214.00M	USD	Point-in-time
Total common stockholders equity	`StockholdersEquity`	$5.02B	USD	Point-in-time
Total common stockholders equity	`StockholdersEquity`	$5.50B	USD	Point-in-time
Noncontrolling interests	`MinorityInterest`	$37.00M	USD	Point-in-time
Noncontrolling interests	`MinorityInterest`	$581.00M	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.48B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.79B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.08B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.05B	USD	Point-in-time
Total Liabilities and Equity	`LiabilitiesAndStockholdersEquity`	$29.67B	USD	Point-in-time
Total Liabilities and Equity	`LiabilitiesAndStockholdersEquity`	$26.84B	USD	Point-in-time

Income Statement 140 line items

Line Item	Tag	Value	Unit	Period
Operating Revenue	`Revenues`	$1.55B	USD	1 Quarter
Operating Revenue	`Revenues`	$1.80B	USD	1 Quarter
Operating Revenue	`Revenues`	$1.79B	USD	1 Quarter
Operating Revenue	`Revenues`	$1.45B	USD	1 Quarter
Operating Revenue	`Revenues`	$1.44B	USD	1 Quarter
Operating Revenue	`Revenues`	$1.57B	USD	1 Quarter
Operating Revenue	`Revenues`	$1.86B	USD	1 Quarter
Operating Revenue	`Revenues`	$2.06B	USD	1 Quarter
Operating Revenue	`Revenues`	$6.68B	USD	Annual
Operating Revenue	`Revenues`	$6.87B	USD	Annual
Operating Revenue	`Revenues`	$6.84B	USD	Annual
Fuel for electric generation	`FuelCosts`	$528.00M	USD	Annual
Fuel for electric generation	`FuelCosts`	$375.00M	USD	Annual
Fuel for electric generation	`FuelCosts`	$493.00M	USD	Annual
Purchased power related parties	`PurchasedPowerRelatedParties`	$81.00M	USD	Annual
Purchased power related parties	`PurchasedPowerRelatedParties`	$75.00M	USD	Annual
Purchased power related parties	`PurchasedPowerRelatedParties`	$64.00M	USD	Annual
Maintenance and other operating expenses	`OtherCostAndExpenseOperating`	$1.42B	USD	Annual
Maintenance and other operating expenses	`OtherCostAndExpenseOperating`	$1.45B	USD	Annual
Maintenance and other operating expenses	`OtherCostAndExpenseOperating`	$1.40B	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$992.00M	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$1.05B	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$933.00M	USD	Annual
General taxes	`TaxesExcludingIncomeAndExciseTaxes`	$303.00M	USD	Annual
General taxes	`TaxesExcludingIncomeAndExciseTaxes`	$333.00M	USD	Annual
General taxes	`TaxesExcludingIncomeAndExciseTaxes`	$359.00M	USD	Annual
Total operating expenses	`CostsAndExpenses`	$5.61B	USD	Annual
Total operating expenses	`CostsAndExpenses`	$5.71B	USD	Annual
Total operating expenses	`CostsAndExpenses`	$5.32B	USD	Annual
Operating Income	`OperatingIncomeLoss`	$351.00M	USD	1 Quarter
Operating Income	`OperatingIncomeLoss`	$352.00M	USD	1 Quarter
Operating Income	`OperatingIncomeLoss`	$1.16B	USD	Annual
Operating Income	`OperatingIncomeLoss`	$311.00M	USD	1 Quarter
Operating Income	`OperatingIncomeLoss`	$218.00M	USD	1 Quarter
Operating Income	`OperatingIncomeLoss`	$359.00M	USD	1 Quarter
Operating Income	`OperatingIncomeLoss`	$273.00M	USD	1 Quarter
Operating Income	`OperatingIncomeLoss`	$368.00M	USD	1 Quarter
Operating Income	`OperatingIncomeLoss`	$1.36B	USD	Annual
Operating Income	`OperatingIncomeLoss`	$369.00M	USD	1 Quarter
Operating Income	`OperatingIncomeLoss`	$1.24B	USD	Annual
Interest income	`InvestmentIncomeInterestAndDividend`	$7.00M	USD	Annual
Interest income	`InvestmentIncomeInterestAndDividend`	$11.00M	USD	Annual
Interest income	`InvestmentIncomeInterestAndDividend`	$4.00M	USD	Annual
Interest and dividend income related parties	`InterestAndDividendIncomeRelatedParties`	$7.00M	USD	Annual
Interest and dividend income related parties	`InterestAndDividendIncomeRelatedParties`	-	USD	Annual
Interest and dividend income related parties	`InterestAndDividendIncomeRelatedParties`	-	USD	Annual
Allowance for equity funds used during construction	`PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity`	$10.00M	USD	Annual
Allowance for equity funds used during construction	`PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity`	$6.00M	USD	Annual
Allowance for equity funds used during construction	`PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity`	$6.00M	USD	Annual
Income from equity method investees	`IncomeLossFromEquityMethodInvestments`	$9.00M	USD	Annual
Income from equity method investees	`IncomeLossFromEquityMethodInvestments`	$5.00M	USD	Annual
Income from equity method investees	`IncomeLossFromEquityMethodInvestments`	$10.00M	USD	Annual
Nonoperating retirement benefits, net	`OtherNonoperatingIncomeExpenseRetirementBenefitsNet`	$118.00M	USD	Annual
Nonoperating retirement benefits, net	`OtherNonoperatingIncomeExpenseRetirementBenefitsNet`	$90.00M	USD	Annual
Nonoperating retirement benefits, net	`OtherNonoperatingIncomeExpenseRetirementBenefitsNet`	$91.00M	USD	Annual
Other income	`OtherNonoperatingIncome`	$4.00M	USD	Annual
Other income	`OtherNonoperatingIncome`	$6.00M	USD	Annual
Other income	`OtherNonoperatingIncome`	$2.00M	USD	Annual
Other expense	`OtherNonoperatingExpense`	$48.00M	USD	Annual
Other expense	`OtherNonoperatingExpense`	$62.00M	USD	Annual
Other expense	`OtherNonoperatingExpense`	$13.00M	USD	Annual
Total other income	`NonoperatingIncomeExpense`	$84.00M	USD	Annual
Total other income	`NonoperatingIncomeExpense`	$70.00M	USD	Annual
Total other income	`NonoperatingIncomeExpense`	$109.00M	USD	Annual
Interest on long-term debt	`InterestExpenseDebt`	$412.00M	USD	Annual
Interest on long-term debt	`InterestExpenseDebt`	$439.00M	USD	Annual
Interest on long-term debt	`InterestExpenseDebt`	$483.00M	USD	Annual
Interest expense related parties	`InterestExpenseRelatedParty`	$9.00M	USD	Annual
Interest expense related parties	`InterestExpenseRelatedParty`	-	USD	Annual
Interest expense related parties	`InterestExpenseRelatedParty`	$12.00M	USD	Annual
Other interest expense	`InterestExpenseOther`	$75.00M	USD	Annual
Other interest expense	`InterestExpenseOther`	$49.00M	USD	Annual
Other interest expense	`InterestExpenseOther`	$68.00M	USD	Annual
Allowance for borrowed funds used during construction	`InterestCostsCapitalizedAdjustment`	$3.00M	USD	Annual
Allowance for borrowed funds used during construction	`InterestCostsCapitalizedAdjustment`	$2.00M	USD	Annual
Allowance for borrowed funds used during construction	`InterestCostsCapitalizedAdjustment`	$4.00M	USD	Annual
Total interest charges	`InterestExpense`	$458.00M	USD	Annual
Total interest charges	`InterestExpense`	$519.00M	USD	Annual
Total interest charges	`InterestExpense`	$561.00M	USD	Annual
Income Before Income Taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$774.00M	USD	Annual
Income Before Income Taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$829.00M	USD	Annual
Income Before Income Taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$885.00M	USD	Annual
Income Tax Expense	`IncomeTaxExpenseBenefit`	$147.00M	USD	Annual
Income Tax Expense	`IncomeTaxExpenseBenefit`	$133.00M	USD	Annual
Income Tax Expense	`IncomeTaxExpenseBenefit`	$115.00M	USD	Annual
Net Income	`ProfitLoss`	$162.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$243.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$207.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$213.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$210.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$94.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$752.00M	USD	Annual
Net Income	`ProfitLoss`	$168.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$137.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$682.00M	USD	Annual
Net Income	`ProfitLoss`	$659.00M	USD	Annual
Income (Loss) Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$-3.00M	USD	Annual
Income (Loss) Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	-	USD	1 Quarter
Income (Loss) Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$4.00M	USD	1 Quarter
Income (Loss) Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	-	USD	1 Quarter
Income (Loss) Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$2.00M	USD	Annual
Income (Loss) Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$1.00M	USD	1 Quarter
Income (Loss) Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	-	USD	1 Quarter
Income (Loss) Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$-8.00M	USD	1 Quarter
Income (Loss) Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$1.00M	USD	1 Quarter
Income (Loss) Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$2.00M	USD	Annual
Income (Loss) Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$1.00M	USD	1 Quarter
Net Income Available to Common Stockholders	`NetIncomeLoss`	$93.00M	USD	1 Quarter
Net Income Available to Common Stockholders	`NetIncomeLoss`	$213.00M	USD	1 Quarter
Net Income Available to Common Stockholders	`NetIncomeLoss`	$243.00M	USD	1 Quarter
Net Income Available to Common Stockholders	`NetIncomeLoss`	$218.00M	USD	1 Quarter
Net Income Available to Common Stockholders	`NetIncomeLoss`	$680.00M	USD	Annual
Net Income Available to Common Stockholders	`NetIncomeLoss`	$158.00M	USD	1 Quarter
Net Income Available to Common Stockholders	`NetIncomeLoss`	$136.00M	USD	1 Quarter
Net Income Available to Common Stockholders	`NetIncomeLoss`	$207.00M	USD	1 Quarter
Net Income Available to Common Stockholders	`NetIncomeLoss`	$167.00M	USD	1 Quarter
Net Income Available to Common Stockholders	`NetIncomeLoss`	$657.00M	USD	Annual
Net Income Available to Common Stockholders	`NetIncomeLoss`	$755.00M	USD	Annual
Basic earnings per average common share (in dollars per share)	`EarningsPerShareBasic`	$0.59	USD	1 Quarter
Basic earnings per average common share (in dollars per share)	`EarningsPerShareBasic`	$2.40	USD	Annual
Basic earnings per average common share (in dollars per share)	`EarningsPerShareBasic`	$0.73	USD	1 Quarter
Basic earnings per average common share (in dollars per share)	`EarningsPerShareBasic`	$0.48	USD	1 Quarter
Basic earnings per average common share (in dollars per share)	`EarningsPerShareBasic`	$0.75	USD	1 Quarter
Basic earnings per average common share (in dollars per share)	`EarningsPerShareBasic`	$2.33	USD	Annual
Basic earnings per average common share (in dollars per share)	`EarningsPerShareBasic`	$2.65	USD	Annual
Basic earnings per average common share (in dollars per share)	`EarningsPerShareBasic`	$0.76	USD	1 Quarter
Basic earnings per average common share (in dollars per share)	`EarningsPerShareBasic`	$0.86	USD	1 Quarter
Basic earnings per average common share (in dollars per share)	`EarningsPerShareBasic`	$0.33	USD	1 Quarter
Basic earnings per average common share (in dollars per share)	`EarningsPerShareBasic`	$0.55	USD	1 Quarter
Diluted earnings per average common share (in dollars per share)	`EarningsPerShareDiluted`	$0.55	USD	1 Quarter
Diluted earnings per average common share (in dollars per share)	`EarningsPerShareDiluted`	$2.64	USD	Annual
Diluted earnings per average common share (in dollars per share)	`EarningsPerShareDiluted`	$0.73	USD	1 Quarter
Diluted earnings per average common share (in dollars per share)	`EarningsPerShareDiluted`	$2.39	USD	Annual
Diluted earnings per average common share (in dollars per share)	`EarningsPerShareDiluted`	$0.85	USD	1 Quarter
Diluted earnings per average common share (in dollars per share)	`EarningsPerShareDiluted`	$2.32	USD	Annual
Diluted earnings per average common share (in dollars per share)	`EarningsPerShareDiluted`	$0.33	USD	1 Quarter
Diluted earnings per average common share (in dollars per share)	`EarningsPerShareDiluted`	$0.75	USD	1 Quarter
Diluted earnings per average common share (in dollars per share)	`EarningsPerShareDiluted`	$0.48	USD	1 Quarter
Diluted earnings per average common share (in dollars per share)	`EarningsPerShareDiluted`	$0.58	USD	1 Quarter
Diluted earnings per average common share (in dollars per share)	`EarningsPerShareDiluted`	$0.76	USD	1 Quarter

Cash Flow Statement 118 line items

Line Item	Tag	Value	Unit	Period
Net Income	`ProfitLoss`	$162.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$243.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$207.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$213.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$210.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$94.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$752.00M	USD	Annual
Net Income	`ProfitLoss`	$168.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$137.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$682.00M	USD	Annual
Net Income	`ProfitLoss`	$659.00M	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$992.00M	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$1.05B	USD	Annual
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$933.00M	USD	Annual
Deferred income taxes and investment tax credits	`DeferredIncomeTaxesAndTaxCredits`	$182.00M	USD	Annual
Deferred income taxes and investment tax credits	`DeferredIncomeTaxesAndTaxCredits`	$170.00M	USD	Annual
Deferred income taxes and investment tax credits	`DeferredIncomeTaxesAndTaxCredits`	$150.00M	USD	Annual
Bad debt expense	`ProvisionForDoubtfulAccounts`	$67.00M	USD	Annual
Bad debt expense	`ProvisionForDoubtfulAccounts`	$90.00M	USD	Annual
Bad debt expense	`ProvisionForDoubtfulAccounts`	$54.00M	USD	Annual
Other non-cash operating activities and reconciling adjustments	`OtherNoncashIncomeExpense`	$-22.00M	USD	Annual
Other non-cash operating activities and reconciling adjustments	`OtherNoncashIncomeExpense`	$58.00M	USD	Annual
Other non-cash operating activities and reconciling adjustments	`OtherNoncashIncomeExpense`	$22.00M	USD	Annual
Postretirement benefits contributions	`PensionAndOtherPostretirementBenefitContributions`	$10.00M	USD	Annual
Postretirement benefits contributions	`PensionAndOtherPostretirementBenefitContributions`	$712.00M	USD	Annual
Postretirement benefits contributions	`PensionAndOtherPostretirementBenefitContributions`	$252.00M	USD	Annual
Accounts and notes receivable and accrued revenue	`IncreaseDecreaseInAccountsAndOtherReceivables`	$-45.00M	USD	Annual
Accounts and notes receivable and accrued revenue	`IncreaseDecreaseInAccountsAndOtherReceivables`	$-15.00M	USD	Annual
Accounts and notes receivable and accrued revenue	`IncreaseDecreaseInAccountsAndOtherReceivables`	$12.00M	USD	Annual
Inventories	`IncreaseDecreaseInInventories`	$-14.00M	USD	Annual
Inventories	`IncreaseDecreaseInInventories`	$-44.00M	USD	Annual
Inventories	`IncreaseDecreaseInInventories`	$-28.00M	USD	Annual
Accounts payable and accrued rate refunds	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$22.00M	USD	Annual
Accounts payable and accrued rate refunds	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$-69.00M	USD	Annual
Accounts payable and accrued rate refunds	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$54.00M	USD	Annual
Other current and non-current assets and liabilities	`IncreaseDecreaseInOtherOperatingCapitalNet`	$120.00M	USD	Annual
Other current and non-current assets and liabilities	`IncreaseDecreaseInOtherOperatingCapitalNet`	$53.00M	USD	Annual
Other current and non-current assets and liabilities	`IncreaseDecreaseInOtherOperatingCapitalNet`	$-54.00M	USD	Annual
Net cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$1.28B	USD	Annual
Net cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$1.70B	USD	Annual
Net cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$1.79B	USD	Annual
Capital expenditures (excludes assets placed under finance lease)	`PaymentsToAcquirePropertyPlantAndEquipment`	$2.07B	USD	Annual
Capital expenditures (excludes assets placed under finance lease)	`PaymentsToAcquirePropertyPlantAndEquipment`	$2.32B	USD	Annual
Capital expenditures (excludes assets placed under finance lease)	`PaymentsToAcquirePropertyPlantAndEquipment`	$2.10B	USD	Annual
Increase in EnerBank notes receivable	`PaymentsToAcquireLoansReceivable`	$657.00M	USD	Annual
Increase in EnerBank notes receivable	`PaymentsToAcquireLoansReceivable`	$307.00M	USD	Annual
Increase in EnerBank notes receivable	`PaymentsToAcquireLoansReceivable`	$401.00M	USD	Annual
Purchase of notes receivable by EnerBank	`PaymentsToAcquireNotesReceivable`	$225.00M	USD	Annual
Purchase of notes receivable by EnerBank	`PaymentsToAcquireNotesReceivable`	$17.00M	USD	Annual
Purchase of notes receivable by EnerBank	`PaymentsToAcquireNotesReceivable`	$343.00M	USD	Annual
Proceeds from DB SERP investments	`ProceedsFromSaleOfAvailableForSaleSecuritiesDebt`	-	USD	Annual
Proceeds from DB SERP investments	`ProceedsFromSaleOfAvailableForSaleSecuritiesDebt`	$146.00M	USD	Annual
Proceeds from DB SERP investments	`ProceedsFromSaleOfAvailableForSaleSecuritiesDebt`	-	USD	Annual
Proceeds from sale of EnerBank notes receivable	`ProceedsFromSaleOfNotesReceivable`	$197.00M	USD	Annual
Proceeds from sale of EnerBank notes receivable	`ProceedsFromSaleOfNotesReceivable`	-	USD	Annual
Proceeds from sale of EnerBank notes receivable	`ProceedsFromSaleOfNotesReceivable`	$67.00M	USD	Annual
Proceeds from sale of transmission equipment	`ProceedsFromSaleOfProductiveAssets`	-	USD	Annual
Proceeds from sale of transmission equipment	`ProceedsFromSaleOfProductiveAssets`	$97.00M	USD	Annual
Proceeds from sale of transmission equipment	`ProceedsFromSaleOfProductiveAssets`	$58.00M	USD	Annual
Cost to retire property and other investing activities	`PaymentsForProceedsFromOtherInvestingActivities`	$132.00M	USD	Annual
Cost to retire property and other investing activities	`PaymentsForProceedsFromOtherInvestingActivities`	$131.00M	USD	Annual
Cost to retire property and other investing activities	`PaymentsForProceedsFromOtherInvestingActivities`	$146.00M	USD	Annual
Net cash used in investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-2.82B	USD	Annual
Net cash used in investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-2.61B	USD	Annual
Net cash used in investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-2.87B	USD	Annual
Proceeds from issuance of debt	`ProceedsFromIssuanceOfLongTermDebt`	$3.18B	USD	Annual
Proceeds from issuance of debt	`ProceedsFromIssuanceOfLongTermDebt`	$2.77B	USD	Annual
Proceeds from issuance of debt	`ProceedsFromIssuanceOfLongTermDebt`	$2.15B	USD	Annual
Retirement of debt	`RepaymentsOfLongTermDebt`	$1.87B	USD	Annual
Retirement of debt	`RepaymentsOfLongTermDebt`	$2.01B	USD	Annual
Retirement of debt	`RepaymentsOfLongTermDebt`	$1.28B	USD	Annual
Increase in EnerBank certificates of deposit	`IncreaseDecreaseInTimeDeposits`	$631.00M	USD	Annual
Increase in EnerBank certificates of deposit	`IncreaseDecreaseInTimeDeposits`	$513.00M	USD	Annual
Increase in EnerBank certificates of deposit	`IncreaseDecreaseInTimeDeposits`	$416.00M	USD	Annual
Decrease in notes payable	`RepaymentsOfShortTermDebt`	$7.00M	USD	Annual
Decrease in notes payable	`RepaymentsOfShortTermDebt`	$90.00M	USD	Annual
Decrease in notes payable	`RepaymentsOfShortTermDebt`	$73.00M	USD	Annual
Issuance of common stock, net of issuance costs	`ProceedsFromIssuanceOfCommonStock`	$12.00M	USD	Annual
Issuance of common stock, net of issuance costs	`ProceedsFromIssuanceOfCommonStock`	$41.00M	USD	Annual
Issuance of common stock, net of issuance costs	`ProceedsFromIssuanceOfCommonStock`	$253.00M	USD	Annual
Payment of dividends on common and preferred stock	`PaymentsOfOrdinaryDividends`	$467.00M	USD	Annual
Payment of dividends on common and preferred stock	`PaymentsOfOrdinaryDividends`	$407.00M	USD	Annual
Payment of dividends on common and preferred stock	`PaymentsOfOrdinaryDividends`	$436.00M	USD	Annual
Debt prepayment costs	`PaymentsOfDebtExtinguishmentCosts`	$8.00M	USD	Annual
Debt prepayment costs	`PaymentsOfDebtExtinguishmentCosts`	$59.00M	USD	Annual
Debt prepayment costs	`PaymentsOfDebtExtinguishmentCosts`	$36.00M	USD	Annual
Proceeds from the sale of membership interest in VIE to tax equity investor	`ProceedsFromSaleOfInterestInPartnershipUnit`	$417.00M	USD	Annual
Proceeds from the sale of membership interest in VIE to tax equity investor	`ProceedsFromSaleOfInterestInPartnershipUnit`	-	USD	Annual
Proceeds from the sale of membership interest in VIE to tax equity investor	`ProceedsFromSaleOfInterestInPartnershipUnit`	-	USD	Annual
Contribution from noncontrolling interest	`ProceedsFromMinorityShareholders`	$31.00M	USD	Annual
Contribution from noncontrolling interest	`ProceedsFromMinorityShareholders`	-	USD	Annual
Contribution from noncontrolling interest	`ProceedsFromMinorityShareholders`	-	USD	Annual
Other financing costs	`ProceedsFromPaymentsForOtherFinancingActivities`	$-51.00M	USD	Annual
Other financing costs	`ProceedsFromPaymentsForOtherFinancingActivities`	$-61.00M	USD	Annual
Other financing costs	`ProceedsFromPaymentsForOtherFinancingActivities`	$-50.00M	USD	Annual
Net cash provided by financing activities	`NetCashProvidedByUsedInFinancingActivities`	$1.62B	USD	Annual
Net cash provided by financing activities	`NetCashProvidedByUsedInFinancingActivities`	$1.01B	USD	Annual
Net cash provided by financing activities	`NetCashProvidedByUsedInFinancingActivities`	$874.00M	USD	Annual
Net Increase (Decrease) in Cash and Cash Equivalents, Including Restricted Amounts	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$-29.00M	USD	Annual
Net Increase (Decrease) in Cash and Cash Equivalents, Including Restricted Amounts	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$28.00M	USD	Annual
Net Increase (Decrease) in Cash and Cash Equivalents, Including Restricted Amounts	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$-18.00M	USD	Annual
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$175.00M	USD	Point-in-time
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$157.00M	USD	Point-in-time
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$185.00M	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, End of Period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$175.00M	USD	Point-in-time
Cash and Cash Equivalents, Including Restricted Amounts, End of Period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$157.00M	USD	Point-in-time
Cash and Cash Equivalents, Including Restricted Amounts, End of Period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$185.00M	USD	Point-in-time
Cash and Cash Equivalents, Including Restricted Amounts, End of Period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$204.00M	USD	Point-in-time
Interest paid (net of amounts capitalized)	`InterestPaidNet`	$549.00M	USD	Annual
Interest paid (net of amounts capitalized)	`InterestPaidNet`	$458.00M	USD	Annual
Interest paid (net of amounts capitalized)	`InterestPaidNet`	$498.00M	USD	Annual
Income taxes paid (refunds received), net	`IncomeTaxesPaidNet`	$-58.00M	USD	Annual
Income taxes paid (refunds received), net	`IncomeTaxesPaidNet`	$-58.00M	USD	Annual
Income taxes paid (refunds received), net	`IncomeTaxesPaidNet`	$-123.00M	USD	Annual
Capital expenditures not paid	`CapitalExpendituresIncurredButNotYetPaid`	$141.00M	USD	Annual
Capital expenditures not paid	`CapitalExpendituresIncurredButNotYetPaid`	$158.00M	USD	Annual
Capital expenditures not paid	`CapitalExpendituresIncurredButNotYetPaid`	$170.00M	USD	Annual

Stockholders Equity 47 line items

Line Item	Tag	Value	Unit	Period
Total Equity at Beginning of Period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.48B	USD	Point-in-time
Total Equity at Beginning of Period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.79B	USD	Point-in-time
Total Equity at Beginning of Period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.08B	USD	Point-in-time
Total Equity at Beginning of Period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.05B	USD	Point-in-time
Beginning of period (in shares)	`CommonStockSharesOutstanding`	288.90M	shares	Point-in-time
Beginning of period (in shares)	`CommonStockSharesOutstanding`	283.90M	shares	Point-in-time
Net loss arising during the period	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	$-4.00M	USD	Annual
Net loss arising during the period	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	$-15.00M	USD	Annual
Net loss arising during the period	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	$-7.00M	USD	Annual
Settlement arising during the period	`OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax`	-	USD	Annual
Settlement arising during the period	`OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax`	-	USD	Annual
Settlement arising during the period	`OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax`	$1.00M	USD	Annual
Prior service credit adjustment	`OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax`	$1.00M	USD	Annual
Prior service credit adjustment	`OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax`	$1.00M	USD	Annual
Prior service credit adjustment	`OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax`	-	USD	Annual
Amortization of net actuarial loss	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax`	$-4.00M	USD	Annual
Amortization of net actuarial loss	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax`	$-5.00M	USD	Annual
Amortization of net actuarial loss	`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
Amortization of prior service credit	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax`	$-2.00M	USD	Annual
Unrealized loss on derivative instruments	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax`	$-3.00M	USD	Annual
Unrealized loss on derivative instruments	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax`	$-2.00M	USD	Annual
Unrealized loss on derivative instruments	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax`	$-4.00M	USD	Annual
Reclassification adjustments included in net income	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax`	-	USD	Annual
Reclassification adjustments included in net income	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax`	$-2.00M	USD	Annual
Reclassification adjustments included in net income	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax`	$-1.00M	USD	Annual
Net Income	`ProfitLoss`	$162.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$243.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$207.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$213.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$210.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$94.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$752.00M	USD	Annual
Net Income	`ProfitLoss`	$168.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$137.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$682.00M	USD	Annual
Net Income	`ProfitLoss`	$659.00M	USD	Annual
End of period (in shares)	`CommonStockSharesOutstanding`	288.90M	shares	Point-in-time
End of period (in shares)	`CommonStockSharesOutstanding`	283.90M	shares	Point-in-time
Total Equity at End of Period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.48B	USD	Point-in-time
Total Equity at End of Period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$4.79B	USD	Point-in-time
Total Equity at End of Period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$6.08B	USD	Point-in-time
Total Equity at End of Period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$5.05B	USD	Point-in-time
Dividends declared per common share (in dollars per share)	`CommonStockDividendsPerShareDeclared`	$1.63	USD	Annual
Dividends declared per common share (in dollars per share)	`CommonStockDividendsPerShareDeclared`	$1.43	USD	Annual
Dividends declared per common share (in dollars per share)	`CommonStockDividendsPerShareDeclared`	$1.53	USD	Annual

Comprehensive Income 65 line items

Line Item	Tag	Value	Unit	Period
Net Income	`ProfitLoss`	$162.00M	USD	1 Quarter
Net loss arising during the period, TAX	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax`	$-3.00M	USD	Annual
Net Income	`ProfitLoss`	$243.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$207.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$213.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$210.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$94.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$752.00M	USD	Annual
Net Income	`ProfitLoss`	$168.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$137.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$682.00M	USD	Annual
Net loss arising during the period, TAX	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax`	$-1.00M	USD	Annual
Net loss arising during the period, TAX	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax`	$-4.00M	USD	Annual
Net Income	`ProfitLoss`	$659.00M	USD	Annual
Settlement arising during the period, TAX	`OtherComprehensiveIncomeFinalizationOfPensionAndNonPensionPostretirementPlanValuationTax`	-	USD	Annual
Settlement arising during the period, TAX	`OtherComprehensiveIncomeFinalizationOfPensionAndNonPensionPostretirementPlanValuationTax`	-	USD	Annual
Settlement arising during the period, TAX	`OtherComprehensiveIncomeFinalizationOfPensionAndNonPensionPostretirementPlanValuationTax`	-	USD	Annual
Net loss arising during the period, net of tax	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	$-4.00M	USD	Annual
Prior service credit adjustment, TAX	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBenefitPlanImprovementTaxEffect`	-	USD	Annual
Prior service credit adjustment, TAX	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBenefitPlanImprovementTaxEffect`	-	USD	Annual
Net loss arising during the period, net of tax	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	$-15.00M	USD	Annual
Net loss arising during the period, net of tax	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	$-7.00M	USD	Annual
Prior service credit adjustment, TAX	`OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBenefitPlanImprovementTaxEffect`	-	USD	Annual
Amortization of net actuarial loss, TAX	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax`	$1.00M	USD	Annual
Settlement arising during the period, net of tax	`OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax`	-	USD	Annual
Amortization of net actuarial loss, TAX	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax`	$1.00M	USD	Annual
Amortization of net actuarial loss, TAX	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax`	$1.00M	USD	Annual
Settlement arising during the period, net of tax	`OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax`	-	USD	Annual
Settlement arising during the period, net of tax	`OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax`	$1.00M	USD	Annual
Prior service credit adjustment, net of tax	`OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax`	$1.00M	USD	Annual
Amortization of prior service credit, TAX	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax`	-	USD	Annual
Prior service credit adjustment, net of tax	`OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax`	$1.00M	USD	Annual
Prior service credit adjustment, net of tax	`OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax`	-	USD	Annual
Amortization of prior service credit, TAX	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax`	$-1.00M	USD	Annual
Amortization of prior service credit, TAX	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax`	-	USD	Annual
Unrealized loss on derivative instruments, TAX	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax`	$-2.00M	USD	Annual
Unrealized loss on derivative instruments, TAX	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax`	$-1.00M	USD	Annual
Amortization of net actuarial loss, net of tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax`	$-4.00M	USD	Annual
Amortization of net actuarial loss, net of tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax`	$-5.00M	USD	Annual
Amortization of net actuarial loss, net of tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax`	$-3.00M	USD	Annual
Unrealized loss on derivative instruments, TAX	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax`	-	USD	Annual
Reclassification adjustments included in net income , TAX	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax`	-	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
Reclassification adjustments included in net income , TAX	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax`	-	USD	Annual
Reclassification adjustments included in net income , TAX	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax`	-	USD	Annual
Amortization of prior service credit, net of tax	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax`	$-2.00M	USD	Annual
Unrealized loss on derivative instruments, net of tax of $(2), $(1), and $	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax`	$-3.00M	USD	Annual
Unrealized loss on derivative instruments, net of tax of $(2), $(1), and $	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax`	$-2.00M	USD	Annual
Unrealized loss on derivative instruments, net of tax of $(2), $(1), and $	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax`	$-4.00M	USD	Annual
Reclassification adjustments included in net income, net of tax of $ for all periods	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax`	-	USD	Annual
Reclassification adjustments included in net income, net of tax of $ for all periods	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax`	$-2.00M	USD	Annual
Reclassification adjustments included in net income, net of tax of $ for all periods	`OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax`	$-1.00M	USD	Annual
Other Comprehensive Loss	`OtherComprehensiveIncomeLossNetOfTax`	$-8.00M	USD	Annual
Other Comprehensive Loss	`OtherComprehensiveIncomeLossNetOfTax`	$-13.00M	USD	Annual
Other Comprehensive Loss	`OtherComprehensiveIncomeLossNetOfTax`	$-4.00M	USD	Annual
Comprehensive Income	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$674.00M	USD	Annual
Comprehensive Income	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$739.00M	USD	Annual
Comprehensive Income	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$655.00M	USD	Annual
Comprehensive Income (Loss) Attributable to Noncontrolling Interests	`ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest`	$-3.00M	USD	Annual
Comprehensive Income (Loss) Attributable to Noncontrolling Interests	`ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest`	$2.00M	USD	Annual
Comprehensive Income (Loss) Attributable to Noncontrolling Interests	`ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest`	$2.00M	USD	Annual
Comprehensive Income Attributable to CMS Energy	`ComprehensiveIncomeNetOfTax`	$742.00M	USD	Annual
Comprehensive Income Attributable to CMS Energy	`ComprehensiveIncomeNetOfTax`	$672.00M	USD	Annual
Comprehensive Income Attributable to CMS Energy	`ComprehensiveIncomeNetOfTax`	$653.00M	USD	Annual

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