10-Q Filing

CMS ENERGY CORP CIK: 811156 Q2 2024

Filing Information

Form Type	10-Q
Accession Number	`0000811156-24-000110`
Period End Date	20240630
Filing Date	20240725
Fiscal Year	2024
Fiscal Period	Q2
XBRL Instance	cms-20240630_htm.xml

Filing Contents

This filing contains the following financial statements:

Balance Sheet 216 Income Statement 216 Cash Flow Statement 108 Stockholders Equity 72 Comprehensive Income 88

Balance Sheet 216 line items

Line Item	Tag	Value	Unit	Period
Accounts receivable and accrued revenue, allowance	`AllowanceForDoubtfulAccountsReceivableCurrent`	$23.00M	USD	Point-in-time
Accounts receivable and accrued revenue, allowance	`AllowanceForDoubtfulAccountsReceivableCurrent`	$23.00M	USD	Point-in-time
Accounts receivable and accrued revenue, allowance	`AllowanceForDoubtfulAccountsReceivableCurrent`	$21.00M	USD	Point-in-time
Accounts receivable and accrued revenue, allowance	`AllowanceForDoubtfulAccountsReceivableCurrent`	$21.00M	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
Common stock authorized (in shares)	`CommonStockSharesAuthorized`	350.00M	shares	Point-in-time
Common stock authorized (in shares)	`CommonStockSharesAuthorized`	350.00M	shares	Point-in-time
Common stock outstanding (in shares)	`CommonStockSharesOutstanding`	294.40M	shares	Point-in-time
Common stock outstanding (in shares)	`CommonStockSharesOutstanding`	294.40M	shares	Point-in-time
Common stock outstanding (in shares)	`CommonStockSharesOutstanding`	298.70M	shares	Point-in-time
Common stock outstanding (in shares)	`CommonStockSharesOutstanding`	298.70M	shares	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$699.00M	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$699.00M	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$227.00M	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$227.00M	USD	Point-in-time
Restricted cash and cash equivalents	`RestrictedCashAndCashEquivalentsAtCarryingValue`	$90.00M	USD	Point-in-time
Restricted cash and cash equivalents	`RestrictedCashAndCashEquivalentsAtCarryingValue`	$90.00M	USD	Point-in-time
Restricted cash and cash equivalents	`RestrictedCashAndCashEquivalentsAtCarryingValue`	$21.00M	USD	Point-in-time
Restricted cash and cash equivalents	`RestrictedCashAndCashEquivalentsAtCarryingValue`	$21.00M	USD	Point-in-time
Gas in underground storage	`EnergyRelatedInventoryGasStoredUnderground`	$587.00M	USD	Point-in-time
Gas in underground storage	`EnergyRelatedInventoryGasStoredUnderground`	$587.00M	USD	Point-in-time
Gas in underground storage	`EnergyRelatedInventoryGasStoredUnderground`	$419.00M	USD	Point-in-time
Gas in underground storage	`EnergyRelatedInventoryGasStoredUnderground`	$419.00M	USD	Point-in-time
Materials and supplies	`OtherInventorySupplies`	$267.00M	USD	Point-in-time
Materials and supplies	`OtherInventorySupplies`	$267.00M	USD	Point-in-time
Materials and supplies	`OtherInventorySupplies`	$280.00M	USD	Point-in-time
Materials and supplies	`OtherInventorySupplies`	$280.00M	USD	Point-in-time
Generating plant fuel stock	`EnergyRelatedInventoryOtherFossilFuel`	$84.00M	USD	Point-in-time
Generating plant fuel stock	`EnergyRelatedInventoryOtherFossilFuel`	$84.00M	USD	Point-in-time
Generating plant fuel stock	`EnergyRelatedInventoryOtherFossilFuel`	$80.00M	USD	Point-in-time
Generating plant fuel stock	`EnergyRelatedInventoryOtherFossilFuel`	$80.00M	USD	Point-in-time
Deferred property taxes	`DeferredPropertyTaxes`	$426.00M	USD	Point-in-time
Deferred property taxes	`DeferredPropertyTaxes`	$426.00M	USD	Point-in-time
Deferred property taxes	`DeferredPropertyTaxes`	$309.00M	USD	Point-in-time
Deferred property taxes	`DeferredPropertyTaxes`	$309.00M	USD	Point-in-time
Regulatory assets	`RegulatoryAssetsCurrent`	$203.00M	USD	Point-in-time
Regulatory assets	`RegulatoryAssetsCurrent`	$203.00M	USD	Point-in-time
Regulatory assets	`RegulatoryAssetsCurrent`	$183.00M	USD	Point-in-time
Regulatory assets	`RegulatoryAssetsCurrent`	$183.00M	USD	Point-in-time
Prepayments and other current assets	`OtherAssetsCurrent`	$80.00M	USD	Point-in-time
Prepayments and other current assets	`OtherAssetsCurrent`	$80.00M	USD	Point-in-time
Prepayments and other current assets	`OtherAssetsCurrent`	$100.00M	USD	Point-in-time
Prepayments and other current assets	`OtherAssetsCurrent`	$100.00M	USD	Point-in-time
Total current assets	`AssetsCurrent`	$2.84B	USD	Point-in-time
Total current assets	`AssetsCurrent`	$2.84B	USD	Point-in-time
Total current assets	`AssetsCurrent`	$2.98B	USD	Point-in-time
Total current assets	`AssetsCurrent`	$2.98B	USD	Point-in-time
Plant, property, and equipment, gross	`PropertyPlantAndEquipmentGrossExcludingCWIP`	$33.13B	USD	Point-in-time
Plant, property, and equipment, gross	`PropertyPlantAndEquipmentGrossExcludingCWIP`	$33.13B	USD	Point-in-time
Plant, property, and equipment, gross	`PropertyPlantAndEquipmentGrossExcludingCWIP`	$33.68B	USD	Point-in-time
Plant, property, and equipment, gross	`PropertyPlantAndEquipmentGrossExcludingCWIP`	$33.68B	USD	Point-in-time
Less accumulated depreciation and amortization	`AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment`	$9.16B	USD	Point-in-time
Less accumulated depreciation and amortization	`AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment`	$9.16B	USD	Point-in-time
Less accumulated depreciation and amortization	`AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment`	$9.01B	USD	Point-in-time
Less accumulated depreciation and amortization	`AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment`	$9.01B	USD	Point-in-time
Plant, property, and equipment, net	`PropertyPlantAndEquipmentNetExcludingCWIP`	$24.13B	USD	Point-in-time
Plant, property, and equipment, net	`PropertyPlantAndEquipmentNetExcludingCWIP`	$24.13B	USD	Point-in-time
Plant, property, and equipment, net	`PropertyPlantAndEquipmentNetExcludingCWIP`	$24.52B	USD	Point-in-time
Plant, property, and equipment, net	`PropertyPlantAndEquipmentNetExcludingCWIP`	$24.52B	USD	Point-in-time
Construction work in progress	`ConstructionInProgressGross`	$944.00M	USD	Point-in-time
Construction work in progress	`ConstructionInProgressGross`	$944.00M	USD	Point-in-time
Construction work in progress	`ConstructionInProgressGross`	$1.36B	USD	Point-in-time
Construction work in progress	`ConstructionInProgressGross`	$1.36B	USD	Point-in-time
Total plant, property, and equipment	`PropertyPlantAndEquipmentNet`	$25.88B	USD	Point-in-time
Total plant, property, and equipment	`PropertyPlantAndEquipmentNet`	$25.88B	USD	Point-in-time
Total plant, property, and equipment	`PropertyPlantAndEquipmentNet`	$25.07B	USD	Point-in-time
Total plant, property, and equipment	`PropertyPlantAndEquipmentNet`	$25.07B	USD	Point-in-time
Regulatory assets	`RegulatoryAssetsNoncurrent`	$3.68B	USD	Point-in-time
Regulatory assets	`RegulatoryAssetsNoncurrent`	$3.68B	USD	Point-in-time
Regulatory assets	`RegulatoryAssetsNoncurrent`	$3.58B	USD	Point-in-time
Regulatory assets	`RegulatoryAssetsNoncurrent`	$3.58B	USD	Point-in-time
Accounts receivable	`LongTermAccountsNotesAndLoansReceivableNetNoncurrent`	$22.00M	USD	Point-in-time
Accounts receivable	`LongTermAccountsNotesAndLoansReceivableNetNoncurrent`	$22.00M	USD	Point-in-time
Accounts receivable	`LongTermAccountsNotesAndLoansReceivableNetNoncurrent`	$22.00M	USD	Point-in-time
Accounts receivable	`LongTermAccountsNotesAndLoansReceivableNetNoncurrent`	$22.00M	USD	Point-in-time
Investments	`EquityMethodInvestments`	$73.00M	USD	Point-in-time
Investments	`EquityMethodInvestments`	$73.00M	USD	Point-in-time
Investments	`EquityMethodInvestments`	$76.00M	USD	Point-in-time
Investments	`EquityMethodInvestments`	$76.00M	USD	Point-in-time
Postretirement benefits	`DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent`	$1.47B	USD	Point-in-time
Postretirement benefits	`DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent`	$1.47B	USD	Point-in-time
Postretirement benefits	`DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent`	$1.55B	USD	Point-in-time
Postretirement benefits	`DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent`	$1.55B	USD	Point-in-time
Other	`OtherAssetsNoncurrent`	$357.00M	USD	Point-in-time
Other	`OtherAssetsNoncurrent`	$357.00M	USD	Point-in-time
Other	`OtherAssetsNoncurrent`	$263.00M	USD	Point-in-time
Other	`OtherAssetsNoncurrent`	$263.00M	USD	Point-in-time
Total other non-current assets	`AssetsNoncurrentOtherThanPropertyPlantAndEquipment`	$5.49B	USD	Point-in-time
Total other non-current assets	`AssetsNoncurrentOtherThanPropertyPlantAndEquipment`	$5.49B	USD	Point-in-time
Total other non-current assets	`AssetsNoncurrentOtherThanPropertyPlantAndEquipment`	$5.61B	USD	Point-in-time
Total other non-current assets	`AssetsNoncurrentOtherThanPropertyPlantAndEquipment`	$5.61B	USD	Point-in-time
Total Assets	`Assets`	$34.35B	USD	Point-in-time
Total Assets	`Assets`	$34.35B	USD	Point-in-time
Total Assets	`Assets`	$33.52B	USD	Point-in-time
Total Assets	`Assets`	$33.52B	USD	Point-in-time
Current portion of long-term debt and finance leases	`LongTermDebtAndLeaseObligationCurrentExcludingNotesPayable`	$980.00M	USD	Point-in-time
Current portion of long-term debt and finance leases	`LongTermDebtAndLeaseObligationCurrentExcludingNotesPayable`	$980.00M	USD	Point-in-time
Current portion of long-term debt and finance leases	`LongTermDebtAndLeaseObligationCurrentExcludingNotesPayable`	$772.00M	USD	Point-in-time
Current portion of long-term debt and finance leases	`LongTermDebtAndLeaseObligationCurrentExcludingNotesPayable`	$772.00M	USD	Point-in-time
Notes payable	`NotesPayableCurrent`	$93.00M	USD	Point-in-time
Notes payable	`NotesPayableCurrent`	$93.00M	USD	Point-in-time
Notes payable	`NotesPayableCurrent`	-	USD	Point-in-time
Notes payable	`NotesPayableCurrent`	-	USD	Point-in-time
Accrued rate refunds	`AccruedRateRefunds`	$54.00M	USD	Point-in-time
Accrued rate refunds	`AccruedRateRefunds`	$54.00M	USD	Point-in-time
Accrued rate refunds	`AccruedRateRefunds`	$50.00M	USD	Point-in-time
Accrued rate refunds	`AccruedRateRefunds`	$50.00M	USD	Point-in-time
Accrued interest	`InterestAndDividendsPayableCurrent`	$142.00M	USD	Point-in-time
Accrued interest	`InterestAndDividendsPayableCurrent`	$142.00M	USD	Point-in-time
Accrued interest	`InterestAndDividendsPayableCurrent`	$155.00M	USD	Point-in-time
Accrued interest	`InterestAndDividendsPayableCurrent`	$155.00M	USD	Point-in-time
Accrued taxes	`TaxesPayableCurrent`	$612.00M	USD	Point-in-time
Accrued taxes	`TaxesPayableCurrent`	$612.00M	USD	Point-in-time
Accrued taxes	`TaxesPayableCurrent`	$449.00M	USD	Point-in-time
Accrued taxes	`TaxesPayableCurrent`	$449.00M	USD	Point-in-time
Regulatory liabilities	`RegulatoryLiabilityCurrent`	$56.00M	USD	Point-in-time
Regulatory liabilities	`RegulatoryLiabilityCurrent`	$56.00M	USD	Point-in-time
Regulatory liabilities	`RegulatoryLiabilityCurrent`	$120.00M	USD	Point-in-time
Regulatory liabilities	`RegulatoryLiabilityCurrent`	$120.00M	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$186.00M	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$186.00M	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$149.00M	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$149.00M	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$2.90B	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$2.90B	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$2.53B	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$2.53B	USD	Point-in-time
Long-term debt	`LongTermDebtNoncurrent`	$14.92B	USD	Point-in-time
Long-term debt	`LongTermDebtNoncurrent`	$14.92B	USD	Point-in-time
Long-term debt	`LongTermDebtNoncurrent`	$14.51B	USD	Point-in-time
Long-term debt	`LongTermDebtNoncurrent`	$14.51B	USD	Point-in-time
Non-current portion of finance leases	`FinanceLeaseLiabilityNoncurrent`	$62.00M	USD	Point-in-time
Non-current portion of finance leases	`FinanceLeaseLiabilityNoncurrent`	$62.00M	USD	Point-in-time
Non-current portion of finance leases	`FinanceLeaseLiabilityNoncurrent`	$79.00M	USD	Point-in-time
Non-current portion of finance leases	`FinanceLeaseLiabilityNoncurrent`	$79.00M	USD	Point-in-time
Regulatory liabilities	`RegulatoryLiabilityNoncurrent`	$3.89B	USD	Point-in-time
Regulatory liabilities	`RegulatoryLiabilityNoncurrent`	$3.89B	USD	Point-in-time
Regulatory liabilities	`RegulatoryLiabilityNoncurrent`	$4.08B	USD	Point-in-time
Regulatory liabilities	`RegulatoryLiabilityNoncurrent`	$4.08B	USD	Point-in-time
Postretirement benefits	`PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent`	$103.00M	USD	Point-in-time
Postretirement benefits	`PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent`	$103.00M	USD	Point-in-time
Postretirement benefits	`PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent`	$106.00M	USD	Point-in-time
Postretirement benefits	`PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent`	$106.00M	USD	Point-in-time
Asset retirement obligations	`AssetRetirementObligationsNoncurrent`	$771.00M	USD	Point-in-time
Asset retirement obligations	`AssetRetirementObligationsNoncurrent`	$771.00M	USD	Point-in-time
Asset retirement obligations	`AssetRetirementObligationsNoncurrent`	$769.00M	USD	Point-in-time
Asset retirement obligations	`AssetRetirementObligationsNoncurrent`	$769.00M	USD	Point-in-time
Deferred investment tax credit	`AccumulatedDeferredInvestmentTaxCredit`	$126.00M	USD	Point-in-time
Deferred investment tax credit	`AccumulatedDeferredInvestmentTaxCredit`	$126.00M	USD	Point-in-time
Deferred investment tax credit	`AccumulatedDeferredInvestmentTaxCredit`	$124.00M	USD	Point-in-time
Deferred investment tax credit	`AccumulatedDeferredInvestmentTaxCredit`	$124.00M	USD	Point-in-time
Deferred income taxes	`DeferredIncomeTaxLiabilitiesNet`	$2.79B	USD	Point-in-time
Deferred income taxes	`DeferredIncomeTaxLiabilitiesNet`	$2.79B	USD	Point-in-time
Deferred income taxes	`DeferredIncomeTaxLiabilitiesNet`	$2.62B	USD	Point-in-time
Deferred income taxes	`DeferredIncomeTaxLiabilitiesNet`	$2.62B	USD	Point-in-time
Other non-current liabilities	`OtherLiabilitiesNoncurrent`	$429.00M	USD	Point-in-time
Other non-current liabilities	`OtherLiabilitiesNoncurrent`	$429.00M	USD	Point-in-time
Other non-current liabilities	`OtherLiabilitiesNoncurrent`	$415.00M	USD	Point-in-time
Other non-current liabilities	`OtherLiabilitiesNoncurrent`	$415.00M	USD	Point-in-time
Total non-current liabilities	`LiabilitiesNoncurrent`	$23.29B	USD	Point-in-time
Total non-current liabilities	`LiabilitiesNoncurrent`	$23.29B	USD	Point-in-time
Total non-current liabilities	`LiabilitiesNoncurrent`	$22.50B	USD	Point-in-time
Total non-current liabilities	`LiabilitiesNoncurrent`	$22.50B	USD	Point-in-time
Commitments and Contingencies	`CommitmentsAndContingencies`	-	USD	Point-in-time
Commitments and Contingencies	`CommitmentsAndContingencies`	-	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
Common stock	`CommonStockValue`	$3.00M	USD	Point-in-time
Common stock	`CommonStockValue`	$3.00M	USD	Point-in-time
Other paid-in capital	`AdditionalPaidInCapitalCommonStock`	$5.99B	USD	Point-in-time
Other paid-in capital	`AdditionalPaidInCapitalCommonStock`	$5.99B	USD	Point-in-time
Other paid-in capital	`AdditionalPaidInCapitalCommonStock`	$5.71B	USD	Point-in-time
Other paid-in capital	`AdditionalPaidInCapitalCommonStock`	$5.71B	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-45.00M	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-45.00M	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-46.00M	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-46.00M	USD	Point-in-time
Retained earnings	`RetainedEarningsAccumulatedDeficit`	$1.83B	USD	Point-in-time
Retained earnings	`RetainedEarningsAccumulatedDeficit`	$1.83B	USD	Point-in-time
Retained earnings	`RetainedEarningsAccumulatedDeficit`	$1.66B	USD	Point-in-time
Retained earnings	`RetainedEarningsAccumulatedDeficit`	$1.66B	USD	Point-in-time
Total common stockholders equity	`CommonStockholdersEquity`	$7.32B	USD	Point-in-time
Total common stockholders equity	`CommonStockholdersEquity`	$7.32B	USD	Point-in-time
Total common stockholders equity	`CommonStockholdersEquity`	$7.78B	USD	Point-in-time
Total common stockholders equity	`CommonStockholdersEquity`	$7.78B	USD	Point-in-time
Cumulative redeemable perpetual preferred stock	`PreferredStockValue`	$224.00M	USD	Point-in-time
Cumulative redeemable perpetual preferred stock	`PreferredStockValue`	$224.00M	USD	Point-in-time
Cumulative redeemable perpetual preferred stock	`PreferredStockValue`	$224.00M	USD	Point-in-time
Cumulative redeemable perpetual preferred stock	`PreferredStockValue`	$224.00M	USD	Point-in-time
Total stockholders equity	`StockholdersEquity`	$8.00B	USD	Point-in-time
Total stockholders equity	`StockholdersEquity`	$8.00B	USD	Point-in-time
Total stockholders equity	`StockholdersEquity`	$7.54B	USD	Point-in-time
Total stockholders equity	`StockholdersEquity`	$7.54B	USD	Point-in-time
Noncontrolling interests	`MinorityInterest`	$581.00M	USD	Point-in-time
Noncontrolling interests	`MinorityInterest`	$581.00M	USD	Point-in-time
Noncontrolling interests	`MinorityInterest`	$538.00M	USD	Point-in-time
Noncontrolling interests	`MinorityInterest`	$538.00M	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$8.51B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$8.51B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$7.59B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$7.59B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$7.65B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$7.65B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$7.71B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$7.71B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$8.12B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$8.12B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$8.54B	USD	Point-in-time
Total equity	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$8.54B	USD	Point-in-time
Total Liabilities and Equity	`LiabilitiesAndStockholdersEquity`	$34.35B	USD	Point-in-time
Total Liabilities and Equity	`LiabilitiesAndStockholdersEquity`	$34.35B	USD	Point-in-time
Total Liabilities and Equity	`LiabilitiesAndStockholdersEquity`	$33.52B	USD	Point-in-time
Total Liabilities and Equity	`LiabilitiesAndStockholdersEquity`	$33.52B	USD	Point-in-time

Income Statement 216 line items

Line Item	Tag	Value	Unit	Period
Tax effect of discontinued operations	`DiscontinuedOperationTaxEffectOfDiscontinuedOperation`	-	USD	2 Qtrs
Tax effect of discontinued operations	`DiscontinuedOperationTaxEffectOfDiscontinuedOperation`	-	USD	2 Qtrs
Tax effect of discontinued operations	`DiscontinuedOperationTaxEffectOfDiscontinuedOperation`	-	USD	2 Qtrs
Tax effect of discontinued operations	`DiscontinuedOperationTaxEffectOfDiscontinuedOperation`	-	USD	2 Qtrs
Tax effect of discontinued operations	`DiscontinuedOperationTaxEffectOfDiscontinuedOperation`	-	USD	1 Quarter
Tax effect of discontinued operations	`DiscontinuedOperationTaxEffectOfDiscontinuedOperation`	-	USD	1 Quarter
Tax effect of discontinued operations	`DiscontinuedOperationTaxEffectOfDiscontinuedOperation`	-	USD	1 Quarter
Tax effect of discontinued operations	`DiscontinuedOperationTaxEffectOfDiscontinuedOperation`	-	USD	1 Quarter
Operating Revenue	`Revenues`	$3.84B	USD	2 Qtrs
Operating Revenue	`Revenues`	$3.84B	USD	2 Qtrs
Operating Revenue	`Revenues`	$3.78B	USD	2 Qtrs
Operating Revenue	`Revenues`	$3.78B	USD	2 Qtrs
Operating Revenue	`Revenues`	$1.55B	USD	1 Quarter
Operating Revenue	`Revenues`	$1.55B	USD	1 Quarter
Operating Revenue	`Revenues`	$1.61B	USD	1 Quarter
Operating Revenue	`Revenues`	$1.61B	USD	1 Quarter
Fuel for electric generation	`FuelCosts`	$114.00M	USD	1 Quarter
Fuel for electric generation	`FuelCosts`	$114.00M	USD	1 Quarter
Fuel for electric generation	`FuelCosts`	$247.00M	USD	2 Qtrs
Fuel for electric generation	`FuelCosts`	$247.00M	USD	2 Qtrs
Fuel for electric generation	`FuelCosts`	$110.00M	USD	1 Quarter
Fuel for electric generation	`FuelCosts`	$110.00M	USD	1 Quarter
Fuel for electric generation	`FuelCosts`	$270.00M	USD	2 Qtrs
Fuel for electric generation	`FuelCosts`	$270.00M	USD	2 Qtrs
Purchased power related parties	`PurchasedPowerRelatedParties`	$34.00M	USD	2 Qtrs
Purchased power related parties	`PurchasedPowerRelatedParties`	$34.00M	USD	2 Qtrs
Purchased power related parties	`PurchasedPowerRelatedParties`	$16.00M	USD	1 Quarter
Purchased power related parties	`PurchasedPowerRelatedParties`	$16.00M	USD	1 Quarter
Purchased power related parties	`PurchasedPowerRelatedParties`	$17.00M	USD	1 Quarter
Purchased power related parties	`PurchasedPowerRelatedParties`	$17.00M	USD	1 Quarter
Purchased power related parties	`PurchasedPowerRelatedParties`	$36.00M	USD	2 Qtrs
Purchased power related parties	`PurchasedPowerRelatedParties`	$36.00M	USD	2 Qtrs
Maintenance and other operating expenses	`OtherCostAndExpenseOperating`	$406.00M	USD	1 Quarter
Maintenance and other operating expenses	`OtherCostAndExpenseOperating`	$406.00M	USD	1 Quarter
Maintenance and other operating expenses	`OtherCostAndExpenseOperating`	$837.00M	USD	2 Qtrs
Maintenance and other operating expenses	`OtherCostAndExpenseOperating`	$837.00M	USD	2 Qtrs
Maintenance and other operating expenses	`OtherCostAndExpenseOperating`	$806.00M	USD	2 Qtrs
Maintenance and other operating expenses	`OtherCostAndExpenseOperating`	$806.00M	USD	2 Qtrs
Maintenance and other operating expenses	`OtherCostAndExpenseOperating`	$404.00M	USD	1 Quarter
Maintenance and other operating expenses	`OtherCostAndExpenseOperating`	$404.00M	USD	1 Quarter
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$641.00M	USD	2 Qtrs
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$641.00M	USD	2 Qtrs
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$255.00M	USD	1 Quarter
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$255.00M	USD	1 Quarter
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$273.00M	USD	1 Quarter
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$273.00M	USD	1 Quarter
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$608.00M	USD	2 Qtrs
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$608.00M	USD	2 Qtrs
General taxes	`TaxesExcludingIncomeAndExciseTaxes`	$97.00M	USD	1 Quarter
General taxes	`TaxesExcludingIncomeAndExciseTaxes`	$97.00M	USD	1 Quarter
General taxes	`TaxesExcludingIncomeAndExciseTaxes`	$239.00M	USD	2 Qtrs
General taxes	`TaxesExcludingIncomeAndExciseTaxes`	$239.00M	USD	2 Qtrs
General taxes	`TaxesExcludingIncomeAndExciseTaxes`	$257.00M	USD	2 Qtrs
General taxes	`TaxesExcludingIncomeAndExciseTaxes`	$257.00M	USD	2 Qtrs
General taxes	`TaxesExcludingIncomeAndExciseTaxes`	$102.00M	USD	1 Quarter
General taxes	`TaxesExcludingIncomeAndExciseTaxes`	$102.00M	USD	1 Quarter
Total operating expenses	`CostsAndExpenses`	$1.32B	USD	1 Quarter
Total operating expenses	`CostsAndExpenses`	$1.32B	USD	1 Quarter
Total operating expenses	`CostsAndExpenses`	$3.09B	USD	2 Qtrs
Total operating expenses	`CostsAndExpenses`	$3.09B	USD	2 Qtrs
Total operating expenses	`CostsAndExpenses`	$1.31B	USD	1 Quarter
Total operating expenses	`CostsAndExpenses`	$1.31B	USD	1 Quarter
Total operating expenses	`CostsAndExpenses`	$3.28B	USD	2 Qtrs
Total operating expenses	`CostsAndExpenses`	$3.28B	USD	2 Qtrs
Operating Income	`OperatingIncomeLoss`	$695.00M	USD	2 Qtrs
Operating Income	`OperatingIncomeLoss`	$695.00M	USD	2 Qtrs
Operating Income	`OperatingIncomeLoss`	$244.00M	USD	1 Quarter
Operating Income	`OperatingIncomeLoss`	$244.00M	USD	1 Quarter
Operating Income	`OperatingIncomeLoss`	$558.00M	USD	2 Qtrs
Operating Income	`OperatingIncomeLoss`	$558.00M	USD	2 Qtrs
Operating Income	`OperatingIncomeLoss`	$283.00M	USD	1 Quarter
Operating Income	`OperatingIncomeLoss`	$283.00M	USD	1 Quarter
Non-operating retirement benefits, net	`OtherNonoperatingIncomeExpenseRetirementBenefitsNet`	$41.00M	USD	1 Quarter
Non-operating retirement benefits, net	`OtherNonoperatingIncomeExpenseRetirementBenefitsNet`	$41.00M	USD	1 Quarter
Non-operating retirement benefits, net	`OtherNonoperatingIncomeExpenseRetirementBenefitsNet`	$90.00M	USD	2 Qtrs
Non-operating retirement benefits, net	`OtherNonoperatingIncomeExpenseRetirementBenefitsNet`	$90.00M	USD	2 Qtrs
Non-operating retirement benefits, net	`OtherNonoperatingIncomeExpenseRetirementBenefitsNet`	$45.00M	USD	1 Quarter
Non-operating retirement benefits, net	`OtherNonoperatingIncomeExpenseRetirementBenefitsNet`	$45.00M	USD	1 Quarter
Non-operating retirement benefits, net	`OtherNonoperatingIncomeExpenseRetirementBenefitsNet`	$85.00M	USD	2 Qtrs
Non-operating retirement benefits, net	`OtherNonoperatingIncomeExpenseRetirementBenefitsNet`	$85.00M	USD	2 Qtrs
Other income	`OtherNonoperatingIncome`	$118.00M	USD	2 Qtrs
Other income	`OtherNonoperatingIncome`	$118.00M	USD	2 Qtrs
Other income	`OtherNonoperatingIncome`	$103.00M	USD	1 Quarter
Other income	`OtherNonoperatingIncome`	$103.00M	USD	1 Quarter
Other income	`OtherNonoperatingIncome`	$121.00M	USD	2 Qtrs
Other income	`OtherNonoperatingIncome`	$121.00M	USD	2 Qtrs
Other income	`OtherNonoperatingIncome`	$77.00M	USD	1 Quarter
Other income	`OtherNonoperatingIncome`	$77.00M	USD	1 Quarter
Other expense	`OtherNonoperatingExpense`	$5.00M	USD	1 Quarter
Other expense	`OtherNonoperatingExpense`	$5.00M	USD	1 Quarter
Other expense	`OtherNonoperatingExpense`	$6.00M	USD	2 Qtrs
Other expense	`OtherNonoperatingExpense`	$6.00M	USD	2 Qtrs
Other expense	`OtherNonoperatingExpense`	$7.00M	USD	2 Qtrs
Other expense	`OtherNonoperatingExpense`	$7.00M	USD	2 Qtrs
Other expense	`OtherNonoperatingExpense`	$2.00M	USD	1 Quarter
Other expense	`OtherNonoperatingExpense`	$2.00M	USD	1 Quarter
Total other income	`NonoperatingIncomeExpense`	$199.00M	USD	2 Qtrs
Total other income	`NonoperatingIncomeExpense`	$199.00M	USD	2 Qtrs
Total other income	`NonoperatingIncomeExpense`	$113.00M	USD	1 Quarter
Total other income	`NonoperatingIncomeExpense`	$113.00M	USD	1 Quarter
Total other income	`NonoperatingIncomeExpense`	$202.00M	USD	2 Qtrs
Total other income	`NonoperatingIncomeExpense`	$202.00M	USD	2 Qtrs
Total other income	`NonoperatingIncomeExpense`	$146.00M	USD	1 Quarter
Total other income	`NonoperatingIncomeExpense`	$146.00M	USD	1 Quarter
Interest on long-term debt	`InterestExpenseDebt`	$171.00M	USD	1 Quarter
Interest on long-term debt	`InterestExpenseDebt`	$171.00M	USD	1 Quarter
Interest on long-term debt	`InterestExpenseDebt`	$343.00M	USD	2 Qtrs
Interest on long-term debt	`InterestExpenseDebt`	$343.00M	USD	2 Qtrs
Interest on long-term debt	`InterestExpenseDebt`	$296.00M	USD	2 Qtrs
Interest on long-term debt	`InterestExpenseDebt`	$296.00M	USD	2 Qtrs
Interest on long-term debt	`InterestExpenseDebt`	$152.00M	USD	1 Quarter
Interest on long-term debt	`InterestExpenseDebt`	$152.00M	USD	1 Quarter
Allowance for borrowed funds used during construction	`InterestCostsCapitalizedAdjustment`	$1.00M	USD	2 Qtrs
Allowance for borrowed funds used during construction	`InterestCostsCapitalizedAdjustment`	$1.00M	USD	2 Qtrs
Allowance for borrowed funds used during construction	`InterestCostsCapitalizedAdjustment`	$6.00M	USD	2 Qtrs
Allowance for borrowed funds used during construction	`InterestCostsCapitalizedAdjustment`	$6.00M	USD	2 Qtrs
Allowance for borrowed funds used during construction	`InterestCostsCapitalizedAdjustment`	$6.00M	USD	1 Quarter
Allowance for borrowed funds used during construction	`InterestCostsCapitalizedAdjustment`	$6.00M	USD	1 Quarter
Allowance for borrowed funds used during construction	`InterestCostsCapitalizedAdjustment`	$1.00M	USD	1 Quarter
Allowance for borrowed funds used during construction	`InterestCostsCapitalizedAdjustment`	$1.00M	USD	1 Quarter
Total interest charges	`InterestExpenseNonoperating`	$173.00M	USD	1 Quarter
Total interest charges	`InterestExpenseNonoperating`	$173.00M	USD	1 Quarter
Total interest charges	`InterestExpenseNonoperating`	$350.00M	USD	2 Qtrs
Total interest charges	`InterestExpenseNonoperating`	$350.00M	USD	2 Qtrs
Total interest charges	`InterestExpenseNonoperating`	$307.00M	USD	2 Qtrs
Total interest charges	`InterestExpenseNonoperating`	$307.00M	USD	2 Qtrs
Total interest charges	`InterestExpenseNonoperating`	$160.00M	USD	1 Quarter
Total interest charges	`InterestExpenseNonoperating`	$160.00M	USD	1 Quarter
Income Before Income Taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$223.00M	USD	1 Quarter
Income Before Income Taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$223.00M	USD	1 Quarter
Income Before Income Taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$230.00M	USD	1 Quarter
Income Before Income Taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$230.00M	USD	1 Quarter
Income Before Income Taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$544.00M	USD	2 Qtrs
Income Before Income Taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$544.00M	USD	2 Qtrs
Income Before Income Taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$453.00M	USD	2 Qtrs
Income Before Income Taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$453.00M	USD	2 Qtrs
Income Tax Expense	`IncomeTaxExpenseBenefit`	$41.00M	USD	1 Quarter
Income Tax Expense	`IncomeTaxExpenseBenefit`	$41.00M	USD	1 Quarter
Income Tax Expense	`IncomeTaxExpenseBenefit`	$99.00M	USD	2 Qtrs
Income Tax Expense	`IncomeTaxExpenseBenefit`	$99.00M	USD	2 Qtrs
Income Tax Expense	`IncomeTaxExpenseBenefit`	$41.00M	USD	1 Quarter
Income Tax Expense	`IncomeTaxExpenseBenefit`	$41.00M	USD	1 Quarter
Income Tax Expense	`IncomeTaxExpenseBenefit`	$70.00M	USD	2 Qtrs
Income Tax Expense	`IncomeTaxExpenseBenefit`	$70.00M	USD	2 Qtrs
Income From Continuing Operations	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$189.00M	USD	1 Quarter
Income From Continuing Operations	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$189.00M	USD	1 Quarter
Income From Continuing Operations	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$182.00M	USD	1 Quarter
Income From Continuing Operations	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$182.00M	USD	1 Quarter
Income From Continuing Operations	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$445.00M	USD	2 Qtrs
Income From Continuing Operations	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$445.00M	USD	2 Qtrs
Income From Continuing Operations	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$383.00M	USD	2 Qtrs
Income From Continuing Operations	`IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest`	$383.00M	USD	2 Qtrs
Income From Discontinued Operations, Net of Tax of $ for all periods	`IncomeLossFromDiscontinuedOperationsNetOfTax`	-	USD	1 Quarter
Income From Discontinued Operations, Net of Tax of $ for all periods	`IncomeLossFromDiscontinuedOperationsNetOfTax`	-	USD	1 Quarter
Income From Discontinued Operations, Net of Tax of $ for all periods	`IncomeLossFromDiscontinuedOperationsNetOfTax`	-	USD	2 Qtrs
Income From Discontinued Operations, Net of Tax of $ for all periods	`IncomeLossFromDiscontinuedOperationsNetOfTax`	-	USD	2 Qtrs
Income From Discontinued Operations, Net of Tax of $ for all periods	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$1.00M	USD	1 Quarter
Income From Discontinued Operations, Net of Tax of $ for all periods	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$1.00M	USD	1 Quarter
Income From Discontinued Operations, Net of Tax of $ for all periods	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$1.00M	USD	2 Qtrs
Income From Discontinued Operations, Net of Tax of $ for all periods	`IncomeLossFromDiscontinuedOperationsNetOfTax`	$1.00M	USD	2 Qtrs
Net Income	`ProfitLoss`	$384.00M	USD	2 Qtrs
Net Income	`ProfitLoss`	$384.00M	USD	2 Qtrs
Net Income	`ProfitLoss`	$182.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$182.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$445.00M	USD	2 Qtrs
Net Income	`ProfitLoss`	$445.00M	USD	2 Qtrs
Net Income	`ProfitLoss`	$190.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$190.00M	USD	1 Quarter
Loss Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$-18.00M	USD	2 Qtrs
Loss Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$-18.00M	USD	2 Qtrs
Loss Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$-8.00M	USD	1 Quarter
Loss Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$-8.00M	USD	1 Quarter
Loss Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$-16.00M	USD	1 Quarter
Loss Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$-16.00M	USD	1 Quarter
Loss Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$-40.00M	USD	2 Qtrs
Loss Attributable to Noncontrolling Interests	`NetIncomeLossAttributableToNoncontrollingInterest`	$-40.00M	USD	2 Qtrs
Net Income	`NetIncomeLoss`	$485.00M	USD	2 Qtrs
Net Income	`NetIncomeLoss`	$485.00M	USD	2 Qtrs
Net Income	`NetIncomeLoss`	$198.00M	USD	1 Quarter
Net Income	`NetIncomeLoss`	$198.00M	USD	1 Quarter
Net Income	`NetIncomeLoss`	$198.00M	USD	1 Quarter
Net Income	`NetIncomeLoss`	$198.00M	USD	1 Quarter
Net Income	`NetIncomeLoss`	$402.00M	USD	2 Qtrs
Net Income	`NetIncomeLoss`	$402.00M	USD	2 Qtrs
Preferred Stock Dividends	`PreferredStockDividendsIncomeStatementImpact`	$5.00M	USD	2 Qtrs
Preferred Stock Dividends	`PreferredStockDividendsIncomeStatementImpact`	$5.00M	USD	2 Qtrs
Preferred Stock Dividends	`PreferredStockDividendsIncomeStatementImpact`	$3.00M	USD	1 Quarter
Preferred Stock Dividends	`PreferredStockDividendsIncomeStatementImpact`	$3.00M	USD	1 Quarter
Preferred Stock Dividends	`PreferredStockDividendsIncomeStatementImpact`	$5.00M	USD	2 Qtrs
Preferred Stock Dividends	`PreferredStockDividendsIncomeStatementImpact`	$5.00M	USD	2 Qtrs
Preferred Stock Dividends	`PreferredStockDividendsIncomeStatementImpact`	$3.00M	USD	1 Quarter
Preferred Stock Dividends	`PreferredStockDividendsIncomeStatementImpact`	$3.00M	USD	1 Quarter
Net Income Available to Common Stockholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$397.00M	USD	2 Qtrs
Net Income Available to Common Stockholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$397.00M	USD	2 Qtrs
Net Income Available to Common Stockholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$195.00M	USD	1 Quarter
Net Income Available to Common Stockholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$195.00M	USD	1 Quarter
Net Income Available to Common Stockholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$480.00M	USD	2 Qtrs
Net Income Available to Common Stockholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$480.00M	USD	2 Qtrs
Net Income Available to Common Stockholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$195.00M	USD	1 Quarter
Net Income Available to Common Stockholders	`NetIncomeLossAvailableToCommonStockholdersBasic`	$195.00M	USD	1 Quarter
Basic earnings per average common share (in dollars per share)	`EarningsPerShareBasic`	$1.36	USD	2 Qtrs
Basic earnings per average common share (in dollars per share)	`EarningsPerShareBasic`	$1.36	USD	2 Qtrs
Basic earnings per average common share (in dollars per share)	`EarningsPerShareBasic`	$1.61	USD	2 Qtrs
Basic earnings per average common share (in dollars per share)	`EarningsPerShareBasic`	$1.61	USD	2 Qtrs
Basic earnings per average common share (in dollars per share)	`EarningsPerShareBasic`	$0.67	USD	1 Quarter
Basic earnings per average common share (in dollars per share)	`EarningsPerShareBasic`	$0.67	USD	1 Quarter
Basic earnings per average common share (in dollars per share)	`EarningsPerShareBasic`	$0.65	USD	1 Quarter
Basic earnings per average common share (in dollars per share)	`EarningsPerShareBasic`	$0.65	USD	1 Quarter
Diluted earnings per average common share (in dollars per share)	`EarningsPerShareDiluted`	$1.36	USD	2 Qtrs
Diluted earnings per average common share (in dollars per share)	`EarningsPerShareDiluted`	$1.36	USD	2 Qtrs
Diluted earnings per average common share (in dollars per share)	`EarningsPerShareDiluted`	$1.61	USD	2 Qtrs
Diluted earnings per average common share (in dollars per share)	`EarningsPerShareDiluted`	$1.61	USD	2 Qtrs
Diluted earnings per average common share (in dollars per share)	`EarningsPerShareDiluted`	$0.67	USD	1 Quarter
Diluted earnings per average common share (in dollars per share)	`EarningsPerShareDiluted`	$0.67	USD	1 Quarter
Diluted earnings per average common share (in dollars per share)	`EarningsPerShareDiluted`	$0.65	USD	1 Quarter
Diluted earnings per average common share (in dollars per share)	`EarningsPerShareDiluted`	$0.65	USD	1 Quarter

Cash Flow Statement 108 line items

Line Item	Tag	Value	Unit	Period
Net Income	`ProfitLoss`	$384.00M	USD	2 Qtrs
Net Income	`ProfitLoss`	$384.00M	USD	2 Qtrs
Net Income	`ProfitLoss`	$182.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$182.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$445.00M	USD	2 Qtrs
Net Income	`ProfitLoss`	$445.00M	USD	2 Qtrs
Net Income	`ProfitLoss`	$190.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$190.00M	USD	1 Quarter
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$641.00M	USD	2 Qtrs
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$641.00M	USD	2 Qtrs
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$255.00M	USD	1 Quarter
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$255.00M	USD	1 Quarter
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$273.00M	USD	1 Quarter
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$273.00M	USD	1 Quarter
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$608.00M	USD	2 Qtrs
Depreciation and amortization	`DepreciationDepletionAndAmortization`	$608.00M	USD	2 Qtrs
Deferred income taxes and investment tax credits	`DeferredIncomeTaxesAndTaxCredits`	$79.00M	USD	2 Qtrs
Deferred income taxes and investment tax credits	`DeferredIncomeTaxesAndTaxCredits`	$79.00M	USD	2 Qtrs
Deferred income taxes and investment tax credits	`DeferredIncomeTaxesAndTaxCredits`	$71.00M	USD	2 Qtrs
Deferred income taxes and investment tax credits	`DeferredIncomeTaxesAndTaxCredits`	$71.00M	USD	2 Qtrs
Other non-cash operating activities and reconciling adjustments	`OtherNoncashIncomeExpense`	$122.00M	USD	2 Qtrs
Other non-cash operating activities and reconciling adjustments	`OtherNoncashIncomeExpense`	$122.00M	USD	2 Qtrs
Other non-cash operating activities and reconciling adjustments	`OtherNoncashIncomeExpense`	$107.00M	USD	2 Qtrs
Other non-cash operating activities and reconciling adjustments	`OtherNoncashIncomeExpense`	$107.00M	USD	2 Qtrs
Accounts receivable and accrued revenue	`IncreaseDecreaseInAccountsAndOtherReceivables`	$-474.00M	USD	2 Qtrs
Accounts receivable and accrued revenue	`IncreaseDecreaseInAccountsAndOtherReceivables`	$-474.00M	USD	2 Qtrs
Accounts receivable and accrued revenue	`IncreaseDecreaseInAccountsAndOtherReceivables`	$-153.00M	USD	2 Qtrs
Accounts receivable and accrued revenue	`IncreaseDecreaseInAccountsAndOtherReceivables`	$-153.00M	USD	2 Qtrs
Inventories	`IncreaseDecreaseInInventories`	$-158.00M	USD	2 Qtrs
Inventories	`IncreaseDecreaseInInventories`	$-158.00M	USD	2 Qtrs
Inventories	`IncreaseDecreaseInInventories`	$-236.00M	USD	2 Qtrs
Inventories	`IncreaseDecreaseInInventories`	$-236.00M	USD	2 Qtrs
Accounts payable and accrued rate refunds	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$-189.00M	USD	2 Qtrs
Accounts payable and accrued rate refunds	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$-189.00M	USD	2 Qtrs
Accounts payable and accrued rate refunds	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$-2.00M	USD	2 Qtrs
Accounts payable and accrued rate refunds	`IncreaseDecreaseInAccountsPayableAndAccruedLiabilities`	$-2.00M	USD	2 Qtrs
Other current assets and liabilities	`IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet`	$-92.00M	USD	2 Qtrs
Other current assets and liabilities	`IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet`	$-92.00M	USD	2 Qtrs
Other current assets and liabilities	`IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet`	$-129.00M	USD	2 Qtrs
Other current assets and liabilities	`IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet`	$-129.00M	USD	2 Qtrs
Other non-current assets and liabilities	`IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet`	$-167.00M	USD	2 Qtrs
Other non-current assets and liabilities	`IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet`	$-167.00M	USD	2 Qtrs
Other non-current assets and liabilities	`IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet`	$-151.00M	USD	2 Qtrs
Other non-current assets and liabilities	`IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet`	$-151.00M	USD	2 Qtrs
Net cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$1.66B	USD	2 Qtrs
Net cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$1.66B	USD	2 Qtrs
Net cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$1.71B	USD	2 Qtrs
Net cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$1.71B	USD	2 Qtrs
Cost to retire property and other investing activities	`PaymentsForProceedsFromOtherInvestingActivities`	$82.00M	USD	2 Qtrs
Cost to retire property and other investing activities	`PaymentsForProceedsFromOtherInvestingActivities`	$82.00M	USD	2 Qtrs
Cost to retire property and other investing activities	`PaymentsForProceedsFromOtherInvestingActivities`	$76.00M	USD	2 Qtrs
Cost to retire property and other investing activities	`PaymentsForProceedsFromOtherInvestingActivities`	$76.00M	USD	2 Qtrs
Net cash used in investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-2.08B	USD	2 Qtrs
Net cash used in investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-2.08B	USD	2 Qtrs
Net cash used in investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-1.25B	USD	2 Qtrs
Net cash used in investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-1.25B	USD	2 Qtrs
Proceeds from issuance of debt	`ProceedsFromIssuanceOfLongTermDebt`	$2.40B	USD	2 Qtrs
Proceeds from issuance of debt	`ProceedsFromIssuanceOfLongTermDebt`	$2.40B	USD	2 Qtrs
Proceeds from issuance of debt	`ProceedsFromIssuanceOfLongTermDebt`	$704.00M	USD	2 Qtrs
Proceeds from issuance of debt	`ProceedsFromIssuanceOfLongTermDebt`	$704.00M	USD	2 Qtrs
Retirement of debt	`RepaymentsOfLongTermDebt`	$1.47B	USD	2 Qtrs
Retirement of debt	`RepaymentsOfLongTermDebt`	$1.47B	USD	2 Qtrs
Retirement of debt	`RepaymentsOfLongTermDebt`	$433.00M	USD	2 Qtrs
Retirement of debt	`RepaymentsOfLongTermDebt`	$433.00M	USD	2 Qtrs
Decrease in notes payable	`ProceedsFromRepaymentsOfShortTermDebt`	$-20.00M	USD	2 Qtrs
Decrease in notes payable	`ProceedsFromRepaymentsOfShortTermDebt`	$-20.00M	USD	2 Qtrs
Decrease in notes payable	`ProceedsFromRepaymentsOfShortTermDebt`	$-93.00M	USD	2 Qtrs
Decrease in notes payable	`ProceedsFromRepaymentsOfShortTermDebt`	$-93.00M	USD	2 Qtrs
Issuance of common stock	`ProceedsFromIssuanceOfCommonStock`	$279.00M	USD	2 Qtrs
Issuance of common stock	`ProceedsFromIssuanceOfCommonStock`	$279.00M	USD	2 Qtrs
Issuance of common stock	`ProceedsFromIssuanceOfCommonStock`	$7.00M	USD	2 Qtrs
Issuance of common stock	`ProceedsFromIssuanceOfCommonStock`	$7.00M	USD	2 Qtrs
Payment of dividends on common and preferred stock	`PaymentsOfOrdinaryDividendsCommonAndPreferred`	$314.00M	USD	2 Qtrs
Payment of dividends on common and preferred stock	`PaymentsOfOrdinaryDividendsCommonAndPreferred`	$314.00M	USD	2 Qtrs
Payment of dividends on common and preferred stock	`PaymentsOfOrdinaryDividendsCommonAndPreferred`	$290.00M	USD	2 Qtrs
Payment of dividends on common and preferred stock	`PaymentsOfOrdinaryDividendsCommonAndPreferred`	$290.00M	USD	2 Qtrs
Other financing costs	`ProceedsFromPaymentsForOtherFinancingActivities`	$-19.00M	USD	2 Qtrs
Other financing costs	`ProceedsFromPaymentsForOtherFinancingActivities`	$-19.00M	USD	2 Qtrs
Other financing costs	`ProceedsFromPaymentsForOtherFinancingActivities`	$-39.00M	USD	2 Qtrs
Other financing costs	`ProceedsFromPaymentsForOtherFinancingActivities`	$-39.00M	USD	2 Qtrs
Net cash provided by financing activities	`NetCashProvidedByUsedInFinancingActivities`	$598.00M	USD	2 Qtrs
Net cash provided by financing activities	`NetCashProvidedByUsedInFinancingActivities`	$598.00M	USD	2 Qtrs
Net cash provided by financing activities	`NetCashProvidedByUsedInFinancingActivities`	$124.00M	USD	2 Qtrs
Net cash provided by financing activities	`NetCashProvidedByUsedInFinancingActivities`	$124.00M	USD	2 Qtrs
Net Increase in Cash and Cash Equivalents, Including Restricted Amounts	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$541.00M	USD	2 Qtrs
Net Increase in Cash and Cash Equivalents, Including Restricted Amounts	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$541.00M	USD	2 Qtrs
Net Increase in Cash and Cash Equivalents, Including Restricted Amounts	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$224.00M	USD	2 Qtrs
Net Increase in Cash and Cash Equivalents, Including Restricted Amounts	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect`	$224.00M	USD	2 Qtrs
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$248.00M	USD	Point-in-time
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$248.00M	USD	Point-in-time
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$789.00M	USD	Point-in-time
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$789.00M	USD	Point-in-time
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$406.00M	USD	Point-in-time
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$406.00M	USD	Point-in-time
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$182.00M	USD	Point-in-time
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$182.00M	USD	Point-in-time
Cash and Cash Equivalents, Including Restricted Amounts, End of Period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$248.00M	USD	Point-in-time
Cash and Cash Equivalents, Including Restricted Amounts, End of Period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$248.00M	USD	Point-in-time
Cash and Cash Equivalents, Including Restricted Amounts, End of Period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$789.00M	USD	Point-in-time
Cash and Cash Equivalents, Including Restricted Amounts, End of Period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$789.00M	USD	Point-in-time
Cash and Cash Equivalents, Including Restricted Amounts, End of Period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$406.00M	USD	Point-in-time
Cash and Cash Equivalents, Including Restricted Amounts, End of Period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$406.00M	USD	Point-in-time
Cash and Cash Equivalents, Including Restricted Amounts, End of Period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$182.00M	USD	Point-in-time
Cash and Cash Equivalents, Including Restricted Amounts, End of Period	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$182.00M	USD	Point-in-time
Capital expenditures not paid	`CapitalExpendituresIncurredButNotYetPaid`	$259.00M	USD	2 Qtrs
Capital expenditures not paid	`CapitalExpendituresIncurredButNotYetPaid`	$259.00M	USD	2 Qtrs
Capital expenditures not paid	`CapitalExpendituresIncurredButNotYetPaid`	$241.00M	USD	2 Qtrs
Capital expenditures not paid	`CapitalExpendituresIncurredButNotYetPaid`	$241.00M	USD	2 Qtrs

Stockholders Equity 72 line items

Line Item	Tag	Value	Unit	Period
Total Equity at Beginning of Period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$8.51B	USD	Point-in-time
Total Equity at Beginning of Period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$8.51B	USD	Point-in-time
Total Equity at Beginning of Period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$7.59B	USD	Point-in-time
Total Equity at Beginning of Period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$7.59B	USD	Point-in-time
Total Equity at Beginning of Period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$7.65B	USD	Point-in-time
Total Equity at Beginning of Period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$7.65B	USD	Point-in-time
Total Equity at Beginning of Period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$7.71B	USD	Point-in-time
Total Equity at Beginning of Period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$7.71B	USD	Point-in-time
Total Equity at Beginning of Period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$8.12B	USD	Point-in-time
Total Equity at Beginning of Period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$8.12B	USD	Point-in-time
Total Equity at Beginning of Period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$8.54B	USD	Point-in-time
Total Equity at Beginning of Period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$8.54B	USD	Point-in-time
Net gain arising during the period	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	-	USD	1 Quarter
Net gain arising during the period	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	-	USD	1 Quarter
Net gain arising during the period	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	-	USD	1 Quarter
Net gain arising during the period	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	-	USD	1 Quarter
Net gain arising during the period	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	-	USD	2 Qtrs
Net gain arising during the period	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	-	USD	2 Qtrs
Net gain arising during the period	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	$1.00M	USD	2 Qtrs
Net gain arising during the period	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	$1.00M	USD	2 Qtrs
Amortization of net actuarial loss	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax`	$-1.00M	USD	1 Quarter
Amortization of net actuarial loss	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax`	$-1.00M	USD	1 Quarter
Amortization of net actuarial loss	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax`	-	USD	1 Quarter
Amortization of net actuarial loss	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax`	-	USD	1 Quarter
Amortization of net actuarial loss	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax`	$-1.00M	USD	2 Qtrs
Amortization of net actuarial loss	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax`	$-1.00M	USD	2 Qtrs
Amortization of net actuarial loss	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax`	$-1.00M	USD	2 Qtrs
Amortization of net actuarial loss	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax`	$-1.00M	USD	2 Qtrs
Amortization of prior service credit	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax`	-	USD	2 Qtrs
Amortization of prior service credit	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax`	-	USD	2 Qtrs
Amortization of prior service credit	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax`	-	USD	1 Quarter
Amortization of prior service credit	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax`	-	USD	1 Quarter
Amortization of prior service credit	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax`	$-1.00M	USD	1 Quarter
Amortization of prior service credit	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax`	$-1.00M	USD	1 Quarter
Amortization of prior service credit	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax`	$-1.00M	USD	2 Qtrs
Amortization of prior service credit	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax`	$-1.00M	USD	2 Qtrs
Net income (loss)	`ProfitLoss`	$384.00M	USD	2 Qtrs
Net income (loss)	`ProfitLoss`	$384.00M	USD	2 Qtrs
Net income (loss)	`ProfitLoss`	$182.00M	USD	1 Quarter
Net income (loss)	`ProfitLoss`	$182.00M	USD	1 Quarter
Net income (loss)	`ProfitLoss`	$445.00M	USD	2 Qtrs
Net income (loss)	`ProfitLoss`	$445.00M	USD	2 Qtrs
Net income (loss)	`ProfitLoss`	$190.00M	USD	1 Quarter
Net income (loss)	`ProfitLoss`	$190.00M	USD	1 Quarter
Total Equity at End of Period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$8.51B	USD	Point-in-time
Total Equity at End of Period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$8.51B	USD	Point-in-time
Total Equity at End of Period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$7.59B	USD	Point-in-time
Total Equity at End of Period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$7.59B	USD	Point-in-time
Total Equity at End of Period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$7.65B	USD	Point-in-time
Total Equity at End of Period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$7.65B	USD	Point-in-time
Total Equity at End of Period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$7.71B	USD	Point-in-time
Total Equity at End of Period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$7.71B	USD	Point-in-time
Total Equity at End of Period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$8.12B	USD	Point-in-time
Total Equity at End of Period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$8.12B	USD	Point-in-time
Total Equity at End of Period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$8.54B	USD	Point-in-time
Total Equity at End of Period	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$8.54B	USD	Point-in-time
Dividends declared per common share (in dollars per share)	`CommonStockDividendsPerShareDeclared`	$1.03	USD	2 Qtrs
Dividends declared per common share (in dollars per share)	`CommonStockDividendsPerShareDeclared`	$1.03	USD	2 Qtrs
Dividends declared per common share (in dollars per share)	`CommonStockDividendsPerShareDeclared`	$0.52	USD	1 Quarter
Dividends declared per common share (in dollars per share)	`CommonStockDividendsPerShareDeclared`	$0.52	USD	1 Quarter
Dividends declared per common share (in dollars per share)	`CommonStockDividendsPerShareDeclared`	$0.97	USD	2 Qtrs
Dividends declared per common share (in dollars per share)	`CommonStockDividendsPerShareDeclared`	$0.97	USD	2 Qtrs
Dividends declared per common share (in dollars per share)	`CommonStockDividendsPerShareDeclared`	$0.49	USD	1 Quarter
Dividends declared per common share (in dollars per share)	`CommonStockDividendsPerShareDeclared`	$0.49	USD	1 Quarter
Dividends declared per preferred stock Series C depositary share (in dollars per share)	`PreferredStockDividendsPerShareDeclared`	$0.26	USD	1 Quarter
Dividends declared per preferred stock Series C depositary share (in dollars per share)	`PreferredStockDividendsPerShareDeclared`	$0.26	USD	1 Quarter
Dividends declared per preferred stock Series C depositary share (in dollars per share)	`PreferredStockDividendsPerShareDeclared`	$0.53	USD	2 Qtrs
Dividends declared per preferred stock Series C depositary share (in dollars per share)	`PreferredStockDividendsPerShareDeclared`	$0.53	USD	2 Qtrs
Dividends declared per preferred stock Series C depositary share (in dollars per share)	`PreferredStockDividendsPerShareDeclared`	$0.53	USD	2 Qtrs
Dividends declared per preferred stock Series C depositary share (in dollars per share)	`PreferredStockDividendsPerShareDeclared`	$0.53	USD	2 Qtrs
Dividends declared per preferred stock Series C depositary share (in dollars per share)	`PreferredStockDividendsPerShareDeclared`	$0.26	USD	1 Quarter
Dividends declared per preferred stock Series C depositary share (in dollars per share)	`PreferredStockDividendsPerShareDeclared`	$0.26	USD	1 Quarter

Comprehensive Income 88 line items

Line Item	Tag	Value	Unit	Period
Net gain arising during the period, tax	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax`	-	USD	2 Qtrs
Net gain arising during the period, tax	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax`	-	USD	2 Qtrs
Net Income	`ProfitLoss`	$384.00M	USD	2 Qtrs
Net Income	`ProfitLoss`	$384.00M	USD	2 Qtrs
Net gain arising during the period, tax	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax`	-	USD	1 Quarter
Net gain arising during the period, tax	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax`	-	USD	1 Quarter
Net gain arising during the period, tax	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax`	-	USD	2 Qtrs
Net gain arising during the period, tax	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax`	-	USD	2 Qtrs
Net Income	`ProfitLoss`	$182.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$182.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$445.00M	USD	2 Qtrs
Net Income	`ProfitLoss`	$445.00M	USD	2 Qtrs
Net gain arising during the period, tax	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax`	-	USD	1 Quarter
Net gain arising during the period, tax	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax`	-	USD	1 Quarter
Net Income	`ProfitLoss`	$190.00M	USD	1 Quarter
Net Income	`ProfitLoss`	$190.00M	USD	1 Quarter
Amortization of net actuarial loss, tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax`	-	USD	1 Quarter
Amortization of net actuarial loss, tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax`	-	USD	1 Quarter
Amortization of net actuarial loss, tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax`	-	USD	2 Qtrs
Amortization of net actuarial loss, tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax`	-	USD	2 Qtrs
Amortization of net actuarial loss, tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax`	-	USD	2 Qtrs
Amortization of net actuarial loss, tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax`	-	USD	2 Qtrs
Amortization of net actuarial loss, tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax`	-	USD	1 Quarter
Amortization of net actuarial loss, tax	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax`	-	USD	1 Quarter
Net gain arising during the period	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	-	USD	1 Quarter
Net gain arising during the period	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	-	USD	1 Quarter
Amortization of prior service credit, tax	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax`	-	USD	2 Qtrs
Amortization of prior service credit, tax	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax`	-	USD	2 Qtrs
Amortization of prior service credit, tax	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax`	-	USD	1 Quarter
Amortization of prior service credit, tax	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax`	-	USD	1 Quarter
Amortization of prior service credit, tax	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax`	-	USD	1 Quarter
Amortization of prior service credit, tax	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax`	-	USD	1 Quarter
Net gain arising during the period	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	-	USD	1 Quarter
Net gain arising during the period	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	-	USD	1 Quarter
Amortization of prior service credit, tax	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax`	-	USD	2 Qtrs
Amortization of prior service credit, tax	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax`	-	USD	2 Qtrs
Net gain arising during the period	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	-	USD	2 Qtrs
Net gain arising during the period	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	-	USD	2 Qtrs
Net gain arising during the period	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	$1.00M	USD	2 Qtrs
Net gain arising during the period	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	$1.00M	USD	2 Qtrs
Amortization of net actuarial loss	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax`	$-1.00M	USD	1 Quarter
Amortization of net actuarial loss	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax`	$-1.00M	USD	1 Quarter
Amortization of net actuarial loss	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax`	-	USD	1 Quarter
Amortization of net actuarial loss	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax`	-	USD	1 Quarter
Amortization of net actuarial loss	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax`	$-1.00M	USD	2 Qtrs
Amortization of net actuarial loss	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax`	$-1.00M	USD	2 Qtrs
Amortization of net actuarial loss	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax`	$-1.00M	USD	2 Qtrs
Amortization of net actuarial loss	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax`	$-1.00M	USD	2 Qtrs
Amortization of prior service credit	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax`	-	USD	2 Qtrs
Amortization of prior service credit	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax`	-	USD	2 Qtrs
Amortization of prior service credit	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax`	-	USD	1 Quarter
Amortization of prior service credit	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax`	-	USD	1 Quarter
Amortization of prior service credit	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax`	$-1.00M	USD	1 Quarter
Amortization of prior service credit	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax`	$-1.00M	USD	1 Quarter
Amortization of prior service credit	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax`	$-1.00M	USD	2 Qtrs
Amortization of prior service credit	`OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax`	$-1.00M	USD	2 Qtrs
Other Comprehensive Income	`OtherComprehensiveIncomeLossNetOfTax`	-	USD	1 Quarter
Other Comprehensive Income	`OtherComprehensiveIncomeLossNetOfTax`	-	USD	1 Quarter
Other Comprehensive Income	`OtherComprehensiveIncomeLossNetOfTax`	-	USD	1 Quarter
Other Comprehensive Income	`OtherComprehensiveIncomeLossNetOfTax`	-	USD	1 Quarter
Other Comprehensive Income	`OtherComprehensiveIncomeLossNetOfTax`	$1.00M	USD	2 Qtrs
Other Comprehensive Income	`OtherComprehensiveIncomeLossNetOfTax`	$1.00M	USD	2 Qtrs
Other Comprehensive Income	`OtherComprehensiveIncomeLossNetOfTax`	$1.00M	USD	2 Qtrs
Other Comprehensive Income	`OtherComprehensiveIncomeLossNetOfTax`	$1.00M	USD	2 Qtrs
Comprehensive Income	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$385.00M	USD	2 Qtrs
Comprehensive Income	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$385.00M	USD	2 Qtrs
Comprehensive Income	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$446.00M	USD	2 Qtrs
Comprehensive Income	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$446.00M	USD	2 Qtrs
Comprehensive Income	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$190.00M	USD	1 Quarter
Comprehensive Income	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$190.00M	USD	1 Quarter
Comprehensive Income	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$182.00M	USD	1 Quarter
Comprehensive Income	`ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest`	$182.00M	USD	1 Quarter
Comprehensive Loss Attributable to Noncontrolling Interests	`ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest`	$-18.00M	USD	2 Qtrs
Comprehensive Loss Attributable to Noncontrolling Interests	`ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest`	$-18.00M	USD	2 Qtrs
Comprehensive Loss Attributable to Noncontrolling Interests	`ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest`	$-16.00M	USD	1 Quarter
Comprehensive Loss Attributable to Noncontrolling Interests	`ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest`	$-16.00M	USD	1 Quarter
Comprehensive Loss Attributable to Noncontrolling Interests	`ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest`	$-8.00M	USD	1 Quarter
Comprehensive Loss Attributable to Noncontrolling Interests	`ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest`	$-8.00M	USD	1 Quarter
Comprehensive Loss Attributable to Noncontrolling Interests	`ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest`	$-40.00M	USD	2 Qtrs
Comprehensive Loss Attributable to Noncontrolling Interests	`ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest`	$-40.00M	USD	2 Qtrs
Comprehensive Income Attributable to CMS Energy	`ComprehensiveIncomeNetOfTax`	$486.00M	USD	2 Qtrs
Comprehensive Income Attributable to CMS Energy	`ComprehensiveIncomeNetOfTax`	$486.00M	USD	2 Qtrs
Comprehensive Income Attributable to CMS Energy	`ComprehensiveIncomeNetOfTax`	$198.00M	USD	1 Quarter
Comprehensive Income Attributable to CMS Energy	`ComprehensiveIncomeNetOfTax`	$198.00M	USD	1 Quarter
Comprehensive Income Attributable to CMS Energy	`ComprehensiveIncomeNetOfTax`	$403.00M	USD	2 Qtrs
Comprehensive Income Attributable to CMS Energy	`ComprehensiveIncomeNetOfTax`	$403.00M	USD	2 Qtrs
Comprehensive Income Attributable to CMS Energy	`ComprehensiveIncomeNetOfTax`	$198.00M	USD	1 Quarter
Comprehensive Income Attributable to CMS Energy	`ComprehensiveIncomeNetOfTax`	$198.00M	USD	1 Quarter

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