AEP


Line plots across dimensions of each concept
Line plots across concepts
Tables

Table of contents



us-gaap:CommonStockValue
dei:LegalEntity

us-gaap:CommonStockSharesIssued
us-gaap:StatementEquityComponents
dei:LegalEntity
us-gaap:CommonStockSharesAuthorized
dei:LegalEntity
us-gaap:CommonStockSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:ComprehensiveIncomeNetOfTax
dei:LegalEntity

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
dei:LegalEntity

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
dei:LegalEntity
dei:LegalEntity, us-gaap:ProductOrService
us-gaap:CostOfGoodsAndServicesSold
us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:DerivativeInstrumentRisk, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:ProductOrService, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
dei:LegalEntity

us-gaap:IncomeTaxExpenseBenefit
dei:LegalEntity
dei:LegalEntity, us-gaap:DerivativeInstrumentRisk, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
dei:LegalEntity, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome
dei:LegalEntity, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
dei:LegalEntity, us-gaap:StatementBusinessSegments
us-gaap:DerivativeInstrumentRisk, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:IncomeTaxesPaidNet
dei:LegalEntity

us-gaap:InterestExpense
dei:LegalEntity
dei:LegalEntity, us-gaap:ConsolidationItems
dei:LegalEntity, us-gaap:DerivativeInstrumentRisk, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
dei:LegalEntity, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome
dei:LegalEntity, us-gaap:StatementBusinessSegments
us-gaap:DerivativeInstrumentRisk, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome

us-gaap:InterestPaidNet
dei:LegalEntity

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest
dei:LegalEntity
dei:LegalEntity, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic
dei:LegalEntity
dei:LegalEntity, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:OperatingExpenses
dei:LegalEntity

us-gaap:OperatingIncomeLoss
dei:LegalEntity

us-gaap:OtherComprehensiveIncomeLossNetOfTax
dei:LegalEntity
dei:LegalEntity, us-gaap:DerivativeInstrumentRisk, us-gaap:StatementEquityComponents
dei:LegalEntity, us-gaap:StatementEquityComponents
us-gaap:DerivativeInstrumentRisk, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:OtherNonoperatingIncomeExpense
dei:LegalEntity

us-gaap:ProfitLoss
dei:LegalEntity
dei:LegalEntity, us-gaap:StatementBusinessSegments
dei:LegalEntity, us-gaap:StatementEquityComponents
us-gaap:StatementBusinessSegments

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax

us-gaap:Revenues
dei:LegalEntity
dei:LegalEntity, us-gaap:ProductOrService
dei:LegalEntity, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:ProductOrService
us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:Assets
aep:VariableInterestEntities, dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
aep:VariableInterestEntities, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
dei:LegalEntity
dei:LegalEntity, us-gaap:ConsolidationItems
dei:LegalEntity, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems
us-gaap:StatementBusinessSegments

us-gaap:Liabilities
dei:LegalEntity

us-gaap:LiabilitiesAndStockholdersEquity
aep:VariableInterestEntities, dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
aep:VariableInterestEntities, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
dei:LegalEntity

us-gaap:StockholdersEquity
dei:LegalEntity

us-gaap:AssetsCurrent
aep:VariableInterestEntities, dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
aep:VariableInterestEntities, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
dei:LegalEntity

us-gaap:CashAndCashEquivalentsAtCarryingValue
dei:LegalEntity
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
dei:LegalEntity

us-gaap:ShortTermInvestments
us-gaap:ConsolidatedEntities

us-gaap:AccountsReceivableNetCurrent
dei:LegalEntity

us-gaap:PrepaidExpenseAndOtherAssetsCurrent
dei:LegalEntity

us-gaap:AssetsNoncurrent
aep:VariableInterestEntities, dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
aep:VariableInterestEntities, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
dei:LegalEntity

us-gaap:PropertyPlantAndEquipmentGross
dei:LegalEntity
dei:LegalEntity, us-gaap:BalanceSheetLocation
dei:LegalEntity, us-gaap:StatementBusinessSegments
us-gaap:BalanceSheetLocation
us-gaap:StatementBusinessSegments

us-gaap:ConstructionInProgressGross
dei:LegalEntity
dei:LegalEntity, us-gaap:PublicUtilityRegulatedOrUnregulatedStatus
us-gaap:PublicUtilityRegulatedOrUnregulatedStatus

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
dei:LegalEntity
dei:LegalEntity, us-gaap:BalanceSheetLocation
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType, us-gaap:PublicUtility
dei:LegalEntity, us-gaap:PublicUtilityRegulatedOrUnregulatedStatus
dei:LegalEntity, us-gaap:StatementBusinessSegments
us-gaap:BalanceSheetLocation
us-gaap:PublicUtilityRegulatedOrUnregulatedStatus
us-gaap:StatementBusinessSegments

us-gaap:PropertyPlantAndEquipmentNet
aep:ApprovedItem, aep:BaseRate, dei:LegalEntity
aep:BaseRate, dei:LegalEntity, us-gaap:PublicUtility
aep:RegulatedStatus, dei:LegalEntity, us-gaap:PublicUtility
aep:RegulatedStatus, us-gaap:PublicUtility
aep:VariableInterestEntities, dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
aep:VariableInterestEntities, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
aep:VariableInterestEntities, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities, us-gaap:StatementEquityComponents
dei:LegalEntity
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType, us-gaap:PublicUtility
dei:LegalEntity, us-gaap:PublicUtilityRegulatedOrUnregulatedStatus
dei:LegalEntity, us-gaap:StatementBusinessSegments
us-gaap:PublicUtilityRegulatedOrUnregulatedStatus
us-gaap:StatementBusinessSegments
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities, us-gaap:StatementEquityComponents

us-gaap:Goodwill
us-gaap:StatementBusinessSegments

us-gaap:OperatingLeaseRightOfUseAsset
dei:LegalEntity
dei:LegalEntity, us-gaap:BalanceSheetLocation
us-gaap:BalanceSheetLocation

us-gaap:OtherAssetsNoncurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:RetirementPlanType

us-gaap:AccountsPayableCurrent
dei:LegalEntity

us-gaap:LiabilitiesCurrent
aep:VariableInterestEntities, dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
aep:VariableInterestEntities, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
dei:LegalEntity

us-gaap:LongTermDebtCurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:StatementBusinessSegments

us-gaap:OperatingLeaseLiabilityCurrent
dei:LegalEntity

us-gaap:OtherLiabilitiesCurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:BalanceSheetLocation
us-gaap:BalanceSheetLocation

us-gaap:TaxesPayableCurrent
dei:LegalEntity

us-gaap:LiabilitiesNoncurrent
aep:VariableInterestEntities, dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
aep:VariableInterestEntities, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
dei:LegalEntity

us-gaap:LongTermDebt
dei:LegalEntity
dei:LegalEntity, us-gaap:ConsolidationItems
dei:LegalEntity, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems
us-gaap:StatementBusinessSegments

us-gaap:LongTermDebtNoncurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:StatementBusinessSegments

us-gaap:DeferredTaxLiabilitiesNoncurrent
dei:LegalEntity

us-gaap:DeferredIncomeTaxLiabilitiesNet
dei:LegalEntity
dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
us-gaap:RetirementPlanType

us-gaap:MinorityInterest
dei:LegalEntity

us-gaap:OtherLiabilitiesNoncurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:BalanceSheetLocation
dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:BalanceSheetLocation

us-gaap:OperatingLeaseLiabilityNoncurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments

us-gaap:OperatingLeaseLiability
dei:LegalEntity

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue
dei:LegalEntity

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount
dei:LegalEntity

us-gaap:StockholdersEquity
dei:LegalEntity

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
aep:VariableInterestEntities, dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
aep:VariableInterestEntities, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
dei:LegalEntity
dei:LegalEntity, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue
dei:LegalEntity

us-gaap:AdditionalPaidInCapital
dei:LegalEntity
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
us-gaap:ImpairedLongLivedAssetsHeldAndUsedByType, us-gaap:StatementBusinessSegments

us-gaap:RetainedEarningsAccumulatedDeficit
dei:LegalEntity

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax
aep:PensionAndOpebActivity, dei:LegalEntity, us-gaap:StatementEquityComponents
aep:PensionAndOpebActivity, us-gaap:StatementEquityComponents
dei:LegalEntity
dei:LegalEntity, us-gaap:DerivativeInstrumentRisk, us-gaap:StatementEquityComponents
dei:LegalEntity, us-gaap:StatementEquityComponents
us-gaap:DerivativeInstrumentRisk, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:MinorityInterest
dei:LegalEntity

us-gaap:StockIssuedDuringPeriodValueNewIssues
us-gaap:StatementEquityComponents
dei:LegalEntity
us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
dei:LegalEntity, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInOperatingActivities
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInInvestingActivities
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInFinancingActivities
dei:LegalEntity
dei:LegalEntity
us-gaap:CashAndCashEquivalentsPeriodIncreaseDecrease

us-gaap:DeferredIncomeTaxExpenseBenefit
dei:LegalEntity

us-gaap:IncreaseDecreaseInAccountsPayable
dei:LegalEntity

us-gaap:IncreaseDecreaseInInventories
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInOperatingActivities
dei:LegalEntity

us-gaap:ProfitLoss
dei:LegalEntity
dei:LegalEntity, us-gaap:StatementBusinessSegments
dei:LegalEntity, us-gaap:StatementEquityComponents
us-gaap:StatementBusinessSegments

us-gaap:NetCashProvidedByUsedInInvestingActivities
dei:LegalEntity

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment
dei:LegalEntity

us-gaap:PaymentsToAcquireInvestments
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInFinancingActivities
dei:LegalEntity

us-gaap:ProceedsFromIssuanceOfLongTermDebt
dei:LegalEntity
dei:LegalEntity, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

us-gaap:RepaymentsOfLongTermDebt

us-gaap:PaymentsOfDividendsCommonStock
dei:LegalEntity

us-gaap:EffectiveIncomeTaxRateContinuingOperations
dei:LegalEntity

us-gaap:UnrecognizedTaxBenefits
us-gaap:IncomeTaxAuthority
us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:ProceedsFromSaleOfShortTermInvestments
aep:BaseRate, dei:LegalEntity
aep:A2013ReversalOfPreviouslyRecordedRegulatoryDisallowances
aep:BaseRate
aep:AEPShareOfETTCumulativeRevenuesSubjectToReview
aep:BaseRate, dei:LegalEntity
aep:AEPTexasCumulativeRevenuesSubjectToReview
aep:BaseRate, dei:LegalEntity
aep:AdditionalRecognizedExpensesConsistingPrimarilyofDepreciationandVegetationManagement
aep:BaseRate, dei:LegalEntity
aep:AdditionalRefundforCurrentYearTaxReformRateChange
aep:BaseRate, dei:LegalEntity
aep:AdditionalRevenuesRecognizedtobeSurchargedtoCustomers
aep:BaseRate, dei:LegalEntity
aep:AdjustedRequestedAnnualIncrease
dei:LegalEntity
aep:AffiliatedDividendsCommonStock
dei:LegalEntity, us-gaap:StatementEquityComponents

aep:AmortizationOfNuclearFuel
dei:LegalEntity
dei:LegalEntity, us-gaap:PublicUtility
aep:AmountOfDoletHillsFuelCostsApprovedToRecover
aep:BaseRate, dei:LegalEntity
aep:AmountOfIncreaseRelatedToAnnualDepreciationExpense
aep:BaseRate, dei:LegalEntity, us-gaap:SubsequentEventType
aep:BaseRate, dei:LegalEntity
aep:AmountOfIncreaseRelatedToRecoveringDeferredHurricaneCosts
aep:BaseRate, dei:LegalEntity
aep:AmountOfIncreaseRelatedToStormCatastropheReserve
aep:BaseRate, dei:LegalEntity, us-gaap:SubsequentEventType
aep:BaseRate, dei:LegalEntity
aep:AmountOfIncreaseRelatedToVegetationManagement
aep:BaseRate, dei:LegalEntity, us-gaap:SubsequentEventType
aep:BaseRate, dei:LegalEntity
aep:AmountOfIncreasedDepreciationExpenseRequested
aep:BaseRate, dei:LegalEntity
aep:AmountofIncreaseRelatedtoCalculatedShortfall
aep:BaseRate, dei:LegalEntity
aep:ApprovedAdditionalVegetationManagementExpenses
aep:BaseRate, dei:LegalEntity
aep:ApprovedAnnualRevenueDecrease
aep:BaseRate, dei:LegalEntity
aep:ApprovedAnnualRevenueIncrease
aep:ApprovedItem, aep:BaseRate, dei:LegalEntity
aep:ApprovedIteminCommissionOrder
aep:BaseRate, dei:LegalEntity
aep:ApprovedNetIncreaseinTexasAnnualRevenues
aep:MoneyPoolParticipantbyCompanyType, dei:LegalEntity
aep:AuthorizedShortTermBorrowingLimit
aep:MoneyPoolParticipantbyCompanyType, dei:LegalEntity
aep:AverageBorrowingsfromMoneyPool
aep:MoneyPoolParticipantbyCompanyType, dei:LegalEntity
aep:AverageInterestRateForFundsBorrowed
aep:MoneyPoolParticipantbyCompanyType, dei:LegalEntity
aep:AverageInterestRateForFundsLoaned
aep:MoneyPoolParticipantbyCompanyType, dei:LegalEntity
aep:AverageLoanstoMoneyPool
aep:BaseRate
aep:CapitalizedStormCosts
aep:BaseRate, dei:LegalEntity
aep:BaseRate, dei:LegalEntity, us-gaap:Range, us-gaap:SubsequentEventType
aep:BaseRate, dei:LegalEntity, us-gaap:StatutoryAccountingPracticesByJurisdiction
dei:LegalEntity
aep:CarryingCostsIncome
dei:LegalEntity
aep:ChangeInRegulatoryAssets

aep:ChangesInFairValueAllocatedToRegulatedJurisdiction
dei:LegalEntity
dei:LegalEntity
aep:CostOfPurchasedPowerFromAffiliate
aep:BaseRate, dei:LegalEntity
aep:CustomersWithoutPower
aep:BaseRate, dei:LegalEntity, us-gaap:SubsequentEventType
aep:BaseRate
aep:DIRRevenueAmountAbove2019AuthorizedLimit
dei:LegalEntity
aep:DeferralOfIncrementalNuclearRefuelingOutageExpensesNet
aep:BaseRate
aep:DeferredStormCostsAsARegulatedAsset
aep:BaseRate, dei:LegalEntity
aep:BaseRate, dei:LegalEntity, us-gaap:StatutoryAccountingPracticesByJurisdiction
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities
aep:DilutiveSecurities1
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType, us-gaap:PublicUtility
aep:DoletHillsLigniteCompanyAndOxbowLigniteBillings

aep:EffectiveIncomeTaxRateReconciliationAFUDCEquityPercentage
dei:LegalEntity

aep:EffectiveIncomeTaxRateReconciliationDiscreteTaxAdjustmentsPercentage
dei:LegalEntity

aep:EffectiveIncomeTaxRateReconciliationFlowThroughPercentage
dei:LegalEntity
dei:LegalEntity
aep:EffectiveIncomeTaxRateReconciliationParentCompanyLossBenefitPercentage

aep:EffectiveIncomeTaxRateReconciliationproductionandinvestmenttaxcredits
dei:LegalEntity

aep:EffectiveInterestRatesOnSecuritizationOfAccountsReceivable
aep:EquityUnits
aep:EquityUnitsIssued
dei:LegalEntity, us-gaap:SubsequentEventType
aep:EstimatedElectricityPurchasesAssociatedWithFebruary2021SevereWeather
dei:LegalEntity, us-gaap:SubsequentEventType
aep:EstimatedNaturalGasExpensesAssociatedWithFebruary2021SevereWeather

aep:FuelOverUnderRecoveryNet
dei:LegalEntity

aep:GainLossOnFairValuePortionOfLongTermDebt

aep:GrossRealizedGainsOnInvestmentSalesOnShortTermInvestment

aep:GrossRealizedLossesOnInvestmentSalesOnShortTermInvestment
aep:BaseRate, dei:LegalEntity
aep:ImpactonPretaxEarningsduetoLossofSignificantContract
aep:BaseRate, dei:LegalEntity
aep:ImpairmentChargeDisallowedPlantInvestments
aep:BaseRate, dei:LegalEntity
aep:ImpairmentChargeTotal
aep:BaseRate, dei:LegalEntity
aep:ImpairmentChargeWelshPlantUnit2

aep:IncomeTaxBenefitReMeasurement

aep:IncomeTaxExpenseReMeasurement
aep:BaseRate, dei:LegalEntity, us-gaap:Range
aep:IntervenorRecommendedAnnualIncrease
aep:MoneyPoolParticipantbyCompanyType, dei:LegalEntity
aep:MaximumBorrowingsfromMoneyPool
aep:MoneyPoolParticipantbyCompanyType, dei:LegalEntity
aep:MaximumInterestRate
aep:MoneyPoolParticipantbyCompanyType, dei:LegalEntity
aep:MaximumInterestRateForFundsLoaned
aep:MoneyPoolParticipantbyCompanyType, dei:LegalEntity
aep:MaximumInterestRateforFundsBorrowed
aep:MoneyPoolParticipantbyCompanyType, dei:LegalEntity
aep:MaximumLoanstoMoneyPool

aep:MaximumPercentageDebtToCapitalization
dei:LegalEntity
aep:EquityUnits
aep:MaximumSharesIssuedUnderEquityUnitsConversion

aep:MaximumValueOfSharesToBeIssuedUnderATMProgram
aep:MoneyPoolParticipantbyCompanyType, dei:LegalEntity
aep:MinimumInterestRate
aep:MoneyPoolParticipantbyCompanyType, dei:LegalEntity
aep:MinimumInterestRateForFundsBorrowed
aep:MoneyPoolParticipantbyCompanyType, dei:LegalEntity
aep:MinimumInterestRateforFundsLoaned
aep:EquityUnits
aep:NetEquityUnitsIssuanceProceeds

aep:NetUncollectibleAccountsReceivableWrittenOff
dei:LegalEntity, us-gaap:SubsequentEventType
aep:NotificationFromSPPForAdditionalCollateralRequirementsRelatedToFebruary2021SevereWeather

aep:OperatingLeaseCostRockport

aep:OtherComprehensiveIncomeUnrealizedGainLossArisingDuringPeriodNetOfTax
dei:LegalEntity
dei:LegalEntity, us-gaap:DerivativeInstrumentRisk, us-gaap:StatementEquityComponents
us-gaap:DerivativeInstrumentRisk, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities, us-gaap:StatementEquityComponents
us-gaap:DerivativeInstrumentRisk, us-gaap:StatementEquityComponents
aep:EquityUnits
aep:PrincipalAmountsOfJuniorSubordinatedDebt
aep:BaseRate, dei:LegalEntity
aep:ProposedSettlementAnnualRateIncrease
dei:LegalEntity
aep:ProvisionforRefund
aep:BaseRate, aep:DisallowanceItem, dei:LegalEntity, us-gaap:SubsequentEventType
aep:RecommendedDisallowanceFromStaffOrIntervenors
aep:BaseRate, aep:DisallowanceItem, dei:LegalEntity, us-gaap:Range
aep:RecommendedDisallowancefromStafforIntervenors
aep:BaseRate, dei:LegalEntity, us-gaap:StatutoryAccountingPracticesByJurisdiction
aep:BaseRate
aep:RefundForExcessADITNotSubjectToRateNormalizationRequirements
aep:BaseRate, dei:LegalEntity
aep:RefundForOverCollections
aep:BaseRate, dei:LegalEntity
aep:RefundforCurrentYearTaxReformRateChange
aep:BaseRate, dei:LegalEntity
aep:RefundforExcessADITAssociatedwithCertainDepreciableProperty
aep:BaseRate, dei:LegalEntity
aep:RequestedAnnualIncrease
aep:BaseRate, dei:LegalEntity, us-gaap:SubsequentEventType
aep:BaseRate, dei:LegalEntity
aep:RequestedNetAnnualIncrease
aep:BaseRate, dei:LegalEntity, us-gaap:SubsequentEventType
aep:BaseRate, dei:LegalEntity
aep:RequestedNetIncreaseinTexasAnnualRevenues
aep:BaseRate
aep:RequestedRecoveryAmountOfPreviouslyAuthorizedDeferral
aep:BaseRate, dei:LegalEntity
aep:RequestedRecoveryOfDoletHillsPowerStation
aep:BaseRate, dei:LegalEntity, us-gaap:SubsequentEventType
aep:BaseRate, dei:LegalEntity
aep:ResultingApprovedBaseRateIncrease
dei:LegalEntity, us-gaap:StatementEquityComponents
aep:ReverseCommonStockSplit
us-gaap:StatementBusinessSegments, us-gaap:SubsequentEventType
aep:RockportPlantUnit2AcquisitionPrice
aep:BaseRate, dei:LegalEntity
aep:SettlementAnnualRevenueCapForTheDIRForTheFirstFiveMonthsOf2024
aep:BaseRate, dei:LegalEntity
aep:SettlementAnnualRevenueCapForTheDIRIn2021
aep:BaseRate, dei:LegalEntity
aep:SettlementAnnualRevenueCapForTheDIRIn2022
aep:BaseRate, dei:LegalEntity
aep:SettlementAnnualRevenueCapForTheDIRIn2023
aep:BaseRate, aep:ProposedAdjustments, dei:LegalEntity
aep:StaffRecommendedAdjustmentsToCompaniesRequest
aep:BaseRate, aep:ProposedAdjustments, dei:LegalEntity, us-gaap:Range
aep:BaseRate, dei:LegalEntity, us-gaap:Range
aep:StaffRecommendedAnnualRateDecrease
aep:BaseRate, dei:LegalEntity
aep:StaffRecommendedAnnualRateIncrease
aep:BaseRate, dei:LegalEntity
aep:StaffRecommendedAnnualRevenueCapForTheDIRForTheFirstFiveMonthsOf2024
aep:BaseRate, dei:LegalEntity
aep:StaffRecommendedAnnualRevenueCapForTheDIRIn2021
aep:BaseRate, dei:LegalEntity
aep:StaffRecommendedAnnualRevenueCapForTheDIRIn2022
aep:BaseRate, dei:LegalEntity
aep:StaffRecommendedAnnualRevenueCapForTheDIRIn2023
aep:BaseRate, dei:LegalEntity, us-gaap:Range
aep:StaffRecommendedReturnOnCommonEquity
aep:BaseRate
aep:TotalEstimatedFebruary2021StormRestorationExpenditures
aep:BaseRate, dei:LegalEntity
aep:BaseRate, dei:LegalEntity, us-gaap:StatutoryAccountingPracticesByJurisdiction
dei:LegalEntity, us-gaap:Range, us-gaap:SubsequentEventType
dei:LegalEntity, us-gaap:SubsequentEventType
aep:TotalEstimatedNaturalGasExpensesAndElectricityPurchaseAssociatedWithFebruary2021SevereWeather
us-gaap:NatureOfExpense
aep:VoluntaryRetirementIncentiveProgramExpense
us-gaap:NatureOfExpense, us-gaap:SubsequentEventType
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
aep:WindGenerationMWs
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments, us-gaap:SubsequentEventType
aep:BaseRate, aep:DisallowanceItem, dei:LegalEntity
aep:WriteoffofRegulatoryExpense
dei:LegalEntity
us-gaap:AdjustmentsToAdditionalPaidInCapitalOther
dei:LegalEntity, us-gaap:PublicUtility
dei:LegalEntity, us-gaap:PublicUtility, us-gaap:SubsequentEventType
dei:LegalEntity, us-gaap:StatementEquityComponents

us-gaap:AmortizationOfDeferredPropertyTaxes
dei:LegalEntity

us-gaap:AssetRetirementObligationAccretionExpense
dei:LegalEntity

us-gaap:AssetRetirementObligationLiabilitiesIncurred

us-gaap:AssetRetirementObligationLiabilitiesSettled
dei:LegalEntity
us-gaap:ImpairedLongLivedAssetsHeldAndUsedByType, us-gaap:StatementBusinessSegments
us-gaap:PublicUtility

us-gaap:AssetRetirementObligationRevisionOfEstimate
aep:AROType, dei:LegalEntity
dei:LegalEntity
dei:LegalEntity, us-gaap:PublicUtility
aep:TrustAssets
us-gaap:AvailableForSaleSecuritiesGrossRealizedGainLossNet
aep:TrustAssets, dei:LegalEntity
aep:TrustAssets
us-gaap:AvailableForSaleSecuritiesGrossRealizedLosses
aep:TrustAssets, dei:LegalEntity
aep:TrustAssets
us-gaap:AvailableForSaleSecuritiesGrossUnrealizedGains
aep:TrustAssets, dei:LegalEntity
aep:TrustAssets, dei:LegalEntity, us-gaap:FinancialInstrument
aep:TrustAssets, us-gaap:FinancialInstrument

us-gaap:CapitalExpendituresIncurredButNotYetPaid

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect
dei:LegalEntity
dei:LegalEntity, us-gaap:DerivativeInstrumentRisk
us-gaap:CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths
us-gaap:DerivativeInstrumentRisk

us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:ConstructionInProgressExpendituresIncurredButNotYetPaid
dei:LegalEntity
dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses
us-gaap:RetirementPlanType
dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
us-gaap:RetirementPlanType
dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets
us-gaap:RetirementPlanType
dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanInterestCost
us-gaap:RetirementPlanType
dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost
us-gaap:RetirementPlanType
dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanServiceCost
us-gaap:RetirementPlanType
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType, us-gaap:PublicUtility
us-gaap:Depreciation

us-gaap:DerivativeGainLossOnDerivativeNet

us-gaap:DividendsCommonStock
us-gaap:StatementEquityComponents

us-gaap:EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate
dei:LegalEntity

us-gaap:EffectiveIncomeTaxRateReconciliationOtherAdjustments
dei:LegalEntity

us-gaap:EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
dei:LegalEntity

us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisChangeInUnrealizedGainLoss

us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings
dei:LegalEntity

us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInOtherComprehensiveIncomeLoss

us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchasesSalesIssuesSettlements
dei:LegalEntity

us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersIntoLevel3

us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersOutOfLevel3
dei:LegalEntity

us-gaap:FinanceLeasePrincipalPayments
dei:LegalEntity

us-gaap:GainLossOnDerivativeInstrumentsNetPretax
dei:LegalEntity
dei:LegalEntity, us-gaap:ConcentrationRiskByBenchmark
us-gaap:ConcentrationRiskByBenchmark
us-gaap:DerivativeInstrumentRisk

us-gaap:IncomeLossFromEquityMethodInvestments
dei:LegalEntity

us-gaap:IncreaseDecreaseInAccountsAndOtherReceivables
dei:LegalEntity

us-gaap:IncreaseDecreaseInAccruedTaxesPayable
dei:LegalEntity
dei:LegalEntity
us-gaap:IncreaseDecreaseInInterestPayableNet
dei:LegalEntity
us-gaap:IncreaseDecreaseInNotesPayableRelatedParties
dei:LegalEntity
us-gaap:IncreaseDecreaseInNotesReceivableRelatedParties

us-gaap:IncreaseDecreaseInOtherCurrentAssets
dei:LegalEntity

us-gaap:IncreaseDecreaseInOtherCurrentLiabilities
dei:LegalEntity

us-gaap:IncreaseDecreaseInOtherNoncurrentAssets
dei:LegalEntity

us-gaap:IncreaseDecreaseInOtherNoncurrentLiabilities
dei:LegalEntity
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities
us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
dei:LegalEntity
us-gaap:InvestmentIncomeInterestAndDividend
dei:LegalEntity, us-gaap:ConsolidationItems
dei:LegalEntity, us-gaap:StatementBusinessSegments

us-gaap:MinorityInterestDecreaseFromRedemptions

us-gaap:NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent
dei:LegalEntity
us-gaap:BalanceSheetLocation
us-gaap:NoncashOrPartNoncashAcquisitionInvestmentsAcquired1
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
us-gaap:ConsolidatedEntities
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us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
us-gaap:NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments, us-gaap:SubsequentEventType
dei:LegalEntity
us-gaap:OperatingLeaseCost
dei:LegalEntity
us-gaap:OperatingLeasePayments
aep:BaseRate, aep:DisallowanceItem, dei:LegalEntity
us-gaap:OtherAssetImpairmentCharges
aep:BaseRate, dei:LegalEntity
aep:BaseRate, dei:LegalEntity, us-gaap:PublicUtility
dei:LegalEntity, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome
us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
dei:LegalEntity, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
dei:LegalEntity

us-gaap:OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax
dei:LegalEntity

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
dei:LegalEntity

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax
dei:LegalEntity
dei:LegalEntity, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome
us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
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us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
aep:TrustAssets
us-gaap:OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
aep:TrustAssets, dei:LegalEntity
aep:TrustAssets, dei:LegalEntity, us-gaap:FinancialInstrument
aep:TrustAssets, us-gaap:FinancialInstrument

us-gaap:PaymentsForConstructionInProcess
dei:LegalEntity

us-gaap:PaymentsForNuclearFuel
dei:LegalEntity

us-gaap:PaymentsForProceedsFromOtherInvestingActivities
dei:LegalEntity
us-gaap:ImpairedLongLivedAssetsHeldAndUsedByType, us-gaap:StatementBusinessSegments
us-gaap:PaymentsForProceedsFromRemovalCosts
us-gaap:PublicUtility, us-gaap:StatementBusinessSegments
us-gaap:StatementScenario, us-gaap:ImpairedLongLivedAssetsHeldAndUsedByType, us-gaap:StatementBusinessSegments
dei:LegalEntity
us-gaap:PaymentsOfDistributionsToAffiliates
aep:TrustAssets
us-gaap:PaymentsToAcquireAvailableForSaleSecurities
aep:TrustAssets, dei:LegalEntity
dei:LegalEntity, us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
us-gaap:PaymentsToAcquireBusinessesGross
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments, us-gaap:SubsequentEventType
us-gaap:ImpairedLongLivedAssetsHeldAndUsedByType, us-gaap:StatementBusinessSegments

us-gaap:PaymentsToAcquireShortTermInvestments

us-gaap:PensionContributions
dei:LegalEntity
dei:LegalEntity
us-gaap:ProceedsFromContributionsFromParent

us-gaap:ProceedsFromIncomeTaxRefunds
dei:LegalEntity

us-gaap:ProceedsFromIssuanceOfCommonStock
us-gaap:SubsequentEventType, us-gaap:SubsidiarySaleOfStock
us-gaap:SubsidiarySaleOfStock

us-gaap:ProceedsFromIssuanceOfDebt

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities
dei:LegalEntity

us-gaap:ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess
dei:LegalEntity

us-gaap:ProceedsFromSaleMaturityAndCollectionsOfInvestments
dei:LegalEntity
aep:TrustAssets
us-gaap:ProceedsFromSaleOfAvailableForSaleSecurities
aep:TrustAssets, dei:LegalEntity
dei:LegalEntity
us-gaap:ProceedsFromSaleOfFinanceReceivables

us-gaap:ProceedsFromShortTermDebtMaturingInMoreThanThreeMonths

us-gaap:PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity
dei:LegalEntity
aep:BaseRate, dei:LegalEntity
us-gaap:PublicUtilitiesApprovedDebtCapitalStructurePercentage
aep:BaseRate, dei:LegalEntity
us-gaap:PublicUtilitiesApprovedEquityCapitalStructurePercentage
aep:BaseRate, dei:LegalEntity
us-gaap:PublicUtilitiesApprovedReturnOnEquityPercentage
aep:BaseRate, dei:LegalEntity, us-gaap:Range
aep:BaseRate, dei:LegalEntity
us-gaap:PublicUtilitiesRequestedReturnOnEquityPercentage

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax
dei:LegalEntity
dei:LegalEntity, us-gaap:DerivativeInstrumentRisk, us-gaap:StatementEquityComponents
dei:LegalEntity, us-gaap:StatementEquityComponents
us-gaap:DerivativeInstrumentRisk, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
dei:LegalEntity
dei:LegalEntity, us-gaap:DerivativeInstrumentRisk, us-gaap:StatementEquityComponents
dei:LegalEntity, us-gaap:StatementEquityComponents
us-gaap:DerivativeInstrumentRisk, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents
dei:LegalEntity
us-gaap:RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty

us-gaap:RepaymentsOfShortTermDebtMaturingInMoreThanThreeMonths
dei:LegalEntity
us-gaap:RevenueFromRelatedParties
dei:LegalEntity, us-gaap:ProductOrService
dei:LegalEntity, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability
dei:LegalEntity
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesNewIssues
us-gaap:SubsequentEventType, us-gaap:SubsidiarySaleOfStock
us-gaap:SubsidiarySaleOfStock

us-gaap:StockholdersEquityOther
aep:EquityUnits, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:TaxesExcludingIncomeAndExciseTaxes
dei:LegalEntity

us-gaap:UnrealizedGainLossOnDerivatives
dei:LegalEntity
us-gaap:FinancialInstrument
us-gaap:UnrealizedGainLossOnInvestments
aep:TrustAssets
us-gaap:UnrealizedGainOnSecurities
aep:TrustAssets, dei:LegalEntity
aep:TrustAssets
us-gaap:UnrealizedLossOnSecurities
aep:TrustAssets, dei:LegalEntity

us-gaap:UtilitiesOperatingExpenseDepreciationAndAmortization
dei:LegalEntity

us-gaap:UtilitiesOperatingExpenseMaintenance
dei:LegalEntity
aep:BaseRate
us-gaap:UtilitiesOperatingExpenseMaintenanceAndOperations
aep:BaseRate, dei:LegalEntity
aep:BaseRate, dei:LegalEntity, us-gaap:Range, us-gaap:SubsequentEventType
aep:BaseRate, dei:LegalEntity, us-gaap:StatutoryAccountingPracticesByJurisdiction

us-gaap:UtilitiesOperatingExpenseOperations
dei:LegalEntity
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
aep:AEPOwnershipinLLCs

aep:AEPShareOfIndependenceEnergyConnectionCapitalCosts
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType, us-gaap:PublicUtility
aep:AcceleratedDepreciation

aep:AccountsReceivableRetainedInterestAndPledgedAsCollateralLessUncollectibleAccounts
dei:LegalEntity
aep:AccruedReimbursementofSpentNuclearFuelCosts
dei:LegalEntity
aep:AccumulatedProvisionsForRateRefunds

aep:AcquisitionOfNuclearFuelIncludedInCurrentLiabilities
dei:LegalEntity
aep:TrustAssets
aep:AdjustedCostOfDebtSecurities
aep:TrustAssets, dei:LegalEntity
aep:TrustAssets
aep:AdjustedCostOfEquitySecurities
aep:TrustAssets, dei:LegalEntity
us-gaap:ConsolidationItems
aep:AffiliatedLongTermDebtNoncurrent
us-gaap:StatementBusinessSegments

aep:AllOtherNet
dei:LegalEntity
dei:LegalEntity, us-gaap:RetirementPlanType
aep:AllocatedAssetsofInvestments
aep:BaseRate, us-gaap:JointlyOwnedUtilityPlant
aep:AlternativeCCRELGInvestment
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
aep:AmountCollectedRiderMineCloseAroNoncurrent
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
aep:AmountCollectedRiderMineCloseOtherAssetsNoncurrent
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
aep:AmountCollectedThroughRiderForFinalMineClosureAndReclamationCosts
dei:LegalEntity
aep:AmountOfFuelCostsUnderReview
dei:LegalEntity, us-gaap:StatutoryAccountingPracticesByJurisdiction

aep:AmountsDueFromCustomersForFutureFederalIncomeTaxes
dei:LegalEntity
dei:LegalEntity
aep:AuctionRateTaxExemptLongTermDebtOutstanding

aep:BadDebtReservesRelatedToSecuritizedSaleOfAccountsReceivable
aep:MoneyPoolParticipantbyCompanyType, dei:LegalEntity
aep:BorrowingsfromParent
aep:BaseRate, dei:LegalEntity
aep:CCRInvestment
aep:BaseRate, us-gaap:JointlyOwnedUtilityPlant

aep:CarryingAmountofHedgedAssetLiability
aep:BaseRate, dei:LegalEntity
aep:CorrespondingRegulatoryLiabilityThatWasRecordedForReductionToRevenues
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType, us-gaap:PublicUtility
aep:CostofRemovalRegulatoryLiability

aep:CreditDowngradeTriggerExposure

aep:CreditFacilitiesStructured

aep:CumulativeFairValueHedgingAdjustmentintheCarryingAmountoftheHedgedAssetLiability
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
aep:DebttoTotalCapitalizationMaximum

aep:DeferredStateIncomeTaxes
dei:LegalEntity

aep:DeferredTaxAssetsLiabilitiesNetPropertyRelatedTemporaryDifferences
dei:LegalEntity

aep:DeferredTaxAssetsLiabilitiesSecuritizedAssets
dei:LegalEntity
dei:LegalEntity
aep:DeferredTaxAssetsLiabilitiesSecuritizedTransitionAssets
dei:LegalEntity, us-gaap:DerivativeInstrumentRisk
aep:DerivativeNonmonetaryEnergyNontionalAmount
us-gaap:DerivativeInstrumentRisk
dei:LegalEntity, us-gaap:DerivativeInstrumentRisk
aep:DerivativeNonmonetaryEnergyNotionalAmount
us-gaap:DerivativeInstrumentRisk
dei:LegalEntity, us-gaap:DerivativeInstrumentRisk
aep:DerivativeNonmonetaryVolumeNotionalAmount
us-gaap:DerivativeInstrumentRisk
dei:LegalEntity, us-gaap:ConcentrationRiskByBenchmark
aep:DerivativeRiskManagementContractsGainLossRecognizedAsRegulatoryAssetLiability
us-gaap:ConcentrationRiskByBenchmark

aep:DividendPaymentRestrictions
dei:LegalEntity
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType, us-gaap:PublicUtility
aep:DoletHillsLigniteCompanyUnbilledFixedCosts
dei:LegalEntity, us-gaap:PublicUtility
aep:BaseRate, dei:LegalEntity
aep:ELGInvestment
aep:BaseRate, us-gaap:JointlyOwnedUtilityPlant
dei:LegalEntity
aep:EmployeeBenefitsAndPensionAssets

aep:EmployeeBenefitsAndPensionObligations
dei:LegalEntity
dei:LegalEntity
aep:EquityAndVotingOwnershipPercentage
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
aep:BaseRate, dei:LegalEntity
aep:EstimatedCCRELGCosts
aep:BaseRate, us-gaap:JointlyOwnedUtilityPlant

aep:ExpectedReimbursementForSpentNuclearFuelDryCaskStorage
dei:LegalEntity

aep:FairValueOfDerivativeLiabilitiesSubjectToCrossDefaultProvisions
dei:LegalEntity
dei:LegalEntity, us-gaap:Range, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:FairValueByFairValueHierarchyLevel
aep:FairValueSignificantUnobservableInputPricePerUnit
us-gaap:Range, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:FairValueByFairValueHierarchyLevel
aep:EquityMethodOwnership
aep:HistoricalInvestmentBalance
aep:EquityMethodOwnership
aep:HistoricalInvestmentBasisDifference
us-gaap:RelatedPartyTransactionsByRelatedParty
aep:JointLicenseAgreement
aep:MoneyPoolParticipantbyCompanyType, dei:LegalEntity
aep:LoanstoParent

aep:MaxPotentialLossOnMasterLeaseAgreements
dei:LegalEntity
dei:LegalEntity, us-gaap:GuaranteeObligationsByNature
aep:MaximumFuturePaymentsforLettersofCreditIssuedUndertheUncommittedFacility
us-gaap:GuaranteeObligationsByNature
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
aep:MaximumPotentialAmountofFuturePaymentsAssociatedwithGuarantee
us-gaap:MajorPropertyClass
aep:MaximumPotentialLeasePaymentsAEPROBargeandBoatLeases

aep:MezzanineEquity
dei:LegalEntity
aep:NetOverRecoveredFuelCosts
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
aep:NonAffiliateInterest

aep:NotionalAmountOfADiscontinuedHedge
us-gaap:RelatedPartyTransactionsByRelatedParty
aep:OklaunionPurchasePowerAgreement
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType, us-gaap:PublicUtility
aep:OxbowUnbilledFixedCosts
dei:LegalEntity, us-gaap:JointlyOwnedUtilityPlant
aep:PercentageInterestInLease
aep:VariableInterestEntities, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
aep:PercentageofanAssetAcquired
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
dei:LegalEntity, us-gaap:PublicUtility
aep:PirkeyPowerPlantAndSabineUnbilledFixedCosts
aep:EquityUnits
aep:PrincipalAmountsofJuniorSubordinatedDebt

aep:RecordedUnconditionalPurchaseObligationDueWithinFourToFiveYear
dei:LegalEntity
dei:LegalEntity, us-gaap:ProductOrService
us-gaap:ProductOrService

aep:RecordedUnconditionalPurchaseObligationDueWithinTwoToThreeYear
dei:LegalEntity
dei:LegalEntity, us-gaap:ProductOrService
us-gaap:ProductOrService

aep:ReductioninAggregateCommonSharesAuthorizedPerShareIssuedPursuanttoStockOptionsorStockAppreciationRights
dei:LegalEntity
aep:RenewableEnergyCredits

aep:RestrictedNetAssets
dei:LegalEntity, us-gaap:PublicUtility
aep:ShareOfNetInvestmentInPirkeyPowerPlant
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType, us-gaap:PublicUtility
aep:ShareofNetInvestmentinDoletHillsPowerStation
dei:LegalEntity, us-gaap:PublicUtility

aep:SpentNuclearFuelAndDecommissioningTrusts

aep:TaxCutsAndJobsActNonDeductibleExecutiveCompensation

aep:TotalCommitmentFromBankConduitsToFinanceReceivables
aep:BaseRate
aep:TotalEstimated2021FebruaryWinterStormFuelCosts
aep:BaseRate, dei:LegalEntity

aep:TotalMezzanineEquity

aep:TrustFundAssetsOneTimeFeeObligationForNuclearFuelDisposition
dei:LegalEntity
dei:LegalEntity, us-gaap:LossContingenciesByNatureOfContingency
us-gaap:LossContingenciesByNatureOfContingency

aep:UnbilledReceivablesRelatedToSecuritizationSaleOfAccountsReceivable
us-gaap:GuaranteeObligationsByNature
aep:UncommittedFacility
dei:LegalEntity, us-gaap:RetirementPlanType
aep:UnderfundedStatusAccumulatedBenefitObligation
us-gaap:RetirementPlanType
dei:LegalEntity, us-gaap:RetirementPlanType
aep:UnderfundedStatusProjectedBenefitObligation
us-gaap:RetirementPlanType
dei:LegalEntity, us-gaap:BalanceSheetLocation, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
aep:UnearnedRevenue

dei:EntityCommonStockSharesOutstanding
dei:LegalEntity

dei:EntityPublicFloat
dei:LegalEntity
us-gaap:AccountsPayableRelatedPartiesCurrent

us-gaap:AccountsReceivableGrossCurrent
aep:BaseRate
aep:BaseRate, dei:LegalEntity
dei:LegalEntity
dei:LegalEntity
us-gaap:AccountsReceivableRelatedPartiesCurrent
dei:LegalEntity, us-gaap:ContractWithCustomerDuration
dei:LegalEntity, us-gaap:DerivativeInstrumentRisk
us-gaap:AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
us-gaap:DerivativeInstrumentRisk

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent
dei:LegalEntity

us-gaap:AssetRetirementObligation
dei:LegalEntity
dei:LegalEntity
us-gaap:AssetRetirementObligationLegallyRestrictedAssetsFairValue

us-gaap:AssetRetirementObligationsNoncurrent
dei:LegalEntity

us-gaap:AssetsFairValueDisclosure
dei:LegalEntity
dei:LegalEntity, us-gaap:FairValueByFairValueHierarchyLevel
dei:LegalEntity, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByMeasurementBasis

us-gaap:AssetsNeededForImmediateSettlementAggregateFairValue
dei:LegalEntity
aep:TrustAssets
us-gaap:AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue
aep:TrustAssets, dei:LegalEntity
aep:TrustAssets
us-gaap:AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue
aep:TrustAssets, dei:LegalEntity
aep:TrustAssets
us-gaap:AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue
aep:TrustAssets, dei:LegalEntity
aep:TrustAssets
us-gaap:AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue
aep:TrustAssets, dei:LegalEntity
dei:LegalEntity
us-gaap:CashAndCashEquivalentsFairValueDisclosure
dei:LegalEntity, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:CommercialPaper

us-gaap:CommonStockCapitalSharesReservedForFutureIssuance
us-gaap:DerivativeInstrumentRisk
us-gaap:CostMethodInvestments
us-gaap:FinancialInstrument

us-gaap:CustomerDepositsCurrent
dei:LegalEntity

us-gaap:DebtInstrumentCarryingAmount
dei:LegalEntity
dei:LegalEntity, us-gaap:ShortTermDebtType
us-gaap:DebtWeightedAverageInterestRate
us-gaap:ShortTermDebtType

us-gaap:DecommissioningLiabilityNoncurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:LossContingenciesByNatureOfContingency
us-gaap:DecommissioningTrustAssetsAmount
us-gaap:LossContingenciesByNatureOfContingency

us-gaap:DeferredGainLossOnDiscontinuationOfFairValueHedge

us-gaap:DeferredIncomeTaxLiabilities
dei:LegalEntity

us-gaap:DeferredTaxAssetsGross
dei:LegalEntity

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards
dei:LegalEntity
dei:LegalEntity
us-gaap:DeferredTaxAssetsPropertyPlantAndEquipment

us-gaap:DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations
dei:LegalEntity

us-gaap:DeferredTaxLiabilitiesInvestments

us-gaap:DeferredTaxLiabilitiesLeasingArrangements
dei:LegalEntity

us-gaap:DeferredTaxLiabilitiesRegulatoryAssets
dei:LegalEntity
dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation
us-gaap:RetirementPlanType
dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax
us-gaap:RetirementPlanType
dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax
us-gaap:RetirementPlanType
dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAmountsRecognizedInBalanceSheet
us-gaap:RetirementPlanType
dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent
dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanBenefitObligation
us-gaap:RetirementPlanType
aep:BenefitPaymentorReceiptbyType, dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
aep:BenefitPaymentorReceiptbyType, us-gaap:RetirementPlanType
aep:BenefitPaymentorReceiptbyType, dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
aep:BenefitPaymentorReceiptbyType, us-gaap:RetirementPlanType
aep:BenefitPaymentorReceiptbyType, dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
aep:BenefitPaymentorReceiptbyType, us-gaap:RetirementPlanType
aep:BenefitPaymentorReceiptbyType, dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
aep:BenefitPaymentorReceiptbyType, us-gaap:RetirementPlanType
aep:BenefitPaymentorReceiptbyType, dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
aep:BenefitPaymentorReceiptbyType, us-gaap:RetirementPlanType
aep:BenefitPaymentorReceiptbyType, dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
aep:BenefitPaymentorReceiptbyType, us-gaap:RetirementPlanType
dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear
us-gaap:RetirementPlanType
dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanFundedStatusOfPlan
us-gaap:RetirementPlanType
dei:LegalEntity, us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanPlanAssetsTargetAllocationPercentage
us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:RetirementPlanType

us-gaap:DelinquentAmountAtEndOfPeriodOnLoansManagedAndSecuritized

us-gaap:DerivativeAssets

us-gaap:DerivativeAssetsCurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:DerivativeInstrumentRisk
dei:LegalEntity, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
dei:LegalEntity, us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeAssetsLiabilitiesAtFairValueNet
dei:LegalEntity, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:DerivativeAssetsNoncurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:DerivativeInstrumentRisk
dei:LegalEntity, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:DerivativeLiabilities

us-gaap:DerivativeLiabilitiesCurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:DerivativeInstrumentRisk
dei:LegalEntity, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:DerivativeLiabilitiesNoncurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:DerivativeInstrumentRisk
dei:LegalEntity, us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
dei:LegalEntity, us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeNotionalAmount
us-gaap:DerivativeInstrumentRisk
dei:LegalEntity
us-gaap:DueFromRelatedPartiesCurrent
dei:LegalEntity
us-gaap:DueToRelatedPartiesCurrent
us-gaap:AwardType
us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
aep:EquityMethodOwnership
us-gaap:EquityMethodInvestmentOwnershipPercentage

us-gaap:EquityMethodInvestments
aep:EquityMethodOwnership
us-gaap:StatementBusinessSegments
us-gaap:FinancialInstrument
us-gaap:EquityMethodInvestmentsFairValueDisclosure

us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs
dei:LegalEntity

us-gaap:FinanceLeaseLiability
dei:LegalEntity

us-gaap:FinanceLeaseLiabilityPaymentsDue
dei:LegalEntity

us-gaap:FinanceLeaseLiabilityPaymentsDueInNextRollingTwelveMonths
dei:LegalEntity

us-gaap:FinanceLeaseLiabilityPaymentsDueInRollingAfterYearFive
dei:LegalEntity

us-gaap:FinanceLeaseLiabilityPaymentsDueInRollingYearFive
dei:LegalEntity

us-gaap:FinanceLeaseLiabilityPaymentsDueInRollingYearFour
dei:LegalEntity

us-gaap:FinanceLeaseLiabilityPaymentsDueInRollingYearThree
dei:LegalEntity

us-gaap:FinanceLeaseLiabilityPaymentsDueInRollingYearTwo
dei:LegalEntity

us-gaap:FinanceLeaseLiabilityUndiscountedExcessAmount
dei:LegalEntity

us-gaap:FinanceLeaseRightOfUseAsset
dei:LegalEntity

us-gaap:FinanceLeaseWeightedAverageDiscountRatePercent
dei:LegalEntity
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
us-gaap:GuaranteeObligationsCurrentCarryingValue
us-gaap:MajorPropertyClass

us-gaap:HedgedLiabilityDiscontinuedFairValueHedgeCumulativeIncreaseDecrease

us-gaap:IncomeTaxesReceivable
dei:LegalEntity

us-gaap:InterestPayableCurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:InventoryRawMaterials
dei:LegalEntity
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:InvestmentOwnedAtCost
us-gaap:FinancialInstrument

us-gaap:InvestmentOwnedUnrecognizedUnrealizedAppreciation
us-gaap:FinancialInstrument

us-gaap:JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInService
dei:LegalEntity
dei:LegalEntity, us-gaap:JointlyOwnedUtilityPlant, us-gaap:PublicUtilitiesInventory
us-gaap:JointlyOwnedUtilityPlant, us-gaap:PublicUtilitiesInventory

us-gaap:JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress
dei:LegalEntity
dei:LegalEntity, us-gaap:JointlyOwnedUtilityPlant, us-gaap:PublicUtilitiesInventory
us-gaap:JointlyOwnedUtilityPlant, us-gaap:PublicUtilitiesInventory

us-gaap:JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciation
dei:LegalEntity
dei:LegalEntity, us-gaap:JointlyOwnedUtilityPlant, us-gaap:PublicUtilitiesInventory
us-gaap:JointlyOwnedUtilityPlant, us-gaap:PublicUtilitiesInventory
dei:LegalEntity
us-gaap:JointlyOwnedUtilityPlantProportionateOwnershipShare
dei:LegalEntity, us-gaap:JointlyOwnedUtilityPlant
dei:LegalEntity, us-gaap:JointlyOwnedUtilityPlant, us-gaap:PublicUtilitiesInventory
us-gaap:JointlyOwnedUtilityPlant, us-gaap:PublicUtilitiesInventory

us-gaap:JuniorSubordinatedNotes

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterRollingYearFive
dei:LegalEntity

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFive
dei:LegalEntity

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour
dei:LegalEntity

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearThree
dei:LegalEntity

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearTwo
dei:LegalEntity

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths
dei:LegalEntity
us-gaap:GuaranteeObligationsByNature
us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity

us-gaap:LongTermDebtFairValue
dei:LegalEntity
us-gaap:LongtermDebtType

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
dei:LegalEntity

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
dei:LegalEntity

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
dei:LegalEntity

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
dei:LegalEntity

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
dei:LegalEntity

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
dei:LegalEntity
dei:LegalEntity, us-gaap:LongtermDebtType
us-gaap:LongtermDebtWeightedAverageInterestRate
us-gaap:LongtermDebtType

us-gaap:LongtermPollutionControlBondCurrentAndNoncurrent
dei:LegalEntity

us-gaap:MarginDepositAssets
dei:LegalEntity
us-gaap:MembersCapital
dei:LegalEntity
us-gaap:MembersEquity
dei:LegalEntity, us-gaap:StatementEquityComponents
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:MineReclamationAndClosingLiabilityNoncurrent
dei:LegalEntity, us-gaap:MajorPropertyClass
us-gaap:MinimumLeasePaymentsSaleLeasebackTransactions
us-gaap:MajorPropertyClass
dei:LegalEntity, us-gaap:MajorPropertyClass
us-gaap:MinimumLeasePaymentsSaleLeasebackTransactionsWithinOneYear
us-gaap:MajorPropertyClass
dei:LegalEntity, us-gaap:MajorPropertyClass
us-gaap:MinimumLeasePaymentsSaleLeasebackTransactionsWithinThreeYears
us-gaap:MajorPropertyClass
dei:LegalEntity, us-gaap:MajorPropertyClass
us-gaap:MinimumLeasePaymentsSaleLeasebackTransactionsWithinTwoYears
us-gaap:MajorPropertyClass

us-gaap:MultiemployerPlansWithdrawalObligation
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:NoncontrollingInterestInVariableInterestEntity

us-gaap:NotesPayable
dei:LegalEntity
dei:LegalEntity, us-gaap:ConsolidationItems
us-gaap:NotesReceivableRelatedParties
dei:LegalEntity, us-gaap:StatementBusinessSegments

us-gaap:ObligationToReturnSecuritiesReceivedAsCollateral
dei:LegalEntity

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent
dei:LegalEntity
dei:LegalEntity, us-gaap:IncomeTaxAuthority
us-gaap:OperatingLossCarryforwards
us-gaap:IncomeTaxAuthority

us-gaap:OtherInventorySupplies
dei:LegalEntity
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType, us-gaap:PublicUtility

us-gaap:OtherLongTermDebt
dei:LegalEntity

us-gaap:OtherNotesPayable
dei:LegalEntity

us-gaap:OtherReceivables
dei:LegalEntity

us-gaap:OtherShortTermBorrowings

us-gaap:OtherShortTermInvestments
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FinancialInstrument
us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis, us-gaap:FinancialInstrument
us-gaap:FinancialInstrument
dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities
us-gaap:RetirementPlanType

us-gaap:PrincipalAmountOutstandingOnLoansHeldForSaleOrSecuritization

us-gaap:PublicUtilitiesPropertyPlantAndEquipmentDistribution
dei:LegalEntity
dei:LegalEntity, us-gaap:PublicUtilityRegulatedOrUnregulatedStatus
us-gaap:PublicUtilityRegulatedOrUnregulatedStatus

us-gaap:PublicUtilitiesPropertyPlantAndEquipmentGenerationOrProcessing
dei:LegalEntity
dei:LegalEntity, us-gaap:BalanceSheetLocation
dei:LegalEntity, us-gaap:PropertyPlantAndEquipmentByType, us-gaap:PublicUtility
dei:LegalEntity, us-gaap:PublicUtilityRegulatedOrUnregulatedStatus
us-gaap:BalanceSheetLocation
us-gaap:PublicUtilityRegulatedOrUnregulatedStatus
aep:BaseRate, dei:LegalEntity, us-gaap:PublicUtility
us-gaap:PublicUtilitiesPropertyPlantAndEquipmentNet
aep:BaseRate, us-gaap:JointlyOwnedUtilityPlant

us-gaap:PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment
dei:LegalEntity
dei:LegalEntity, us-gaap:BalanceSheetLocation
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
dei:LegalEntity, us-gaap:PublicUtilityRegulatedOrUnregulatedStatus
us-gaap:BalanceSheetLocation
us-gaap:PublicUtilityRegulatedOrUnregulatedStatus

us-gaap:PublicUtilitiesPropertyPlantAndEquipmentTransmission
dei:LegalEntity
dei:LegalEntity, us-gaap:PublicUtilityRegulatedOrUnregulatedStatus
us-gaap:PublicUtilityRegulatedOrUnregulatedStatus
dei:LegalEntity
us-gaap:ReceivablesHeldForSaleAmount

us-gaap:RecordedUnconditionalPurchaseObligation
dei:LegalEntity
dei:LegalEntity, us-gaap:ProductOrService
us-gaap:ProductOrService

us-gaap:RecordedUnconditionalPurchaseObligationDueAfterFifthYear
dei:LegalEntity
dei:LegalEntity, us-gaap:ProductOrService
us-gaap:ProductOrService

us-gaap:RecordedUnconditionalPurchaseObligationDueWithinOneYear
dei:LegalEntity
dei:LegalEntity, us-gaap:ProductOrService
us-gaap:ProductOrService
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
us-gaap:RedeemableNoncontrollingInterestEquityCarryingAmount
us-gaap:ImpairedLongLivedAssetsHeldAndUsedByType, us-gaap:StatementBusinessSegments
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:RegulatoryAssetsCurrent
aep:RegulatoryAssetsCurrentlyReturn, dei:LegalEntity, us-gaap:PublicUtility
aep:RegulatoryAssetsCurrentlyReturn, us-gaap:PublicUtility
dei:LegalEntity

us-gaap:RegulatoryAssetsNoncurrent

us-gaap:RegulatoryLiabilityCurrent
aep:RegulatoryLiabilities, dei:LegalEntity, us-gaap:PublicUtility
aep:RegulatoryLiabilities, us-gaap:PublicUtility
dei:LegalEntity

us-gaap:RegulatoryLiabilityNoncurrent
aep:MoneyPoolParticipantbyCompanyType, dei:LegalEntity
us-gaap:RelatedPartyTransactionDueFromToRelatedParty
aep:MoneyPoolParticipantbyCompanyType, dei:LegalEntity
us-gaap:RelatedPartyTransactionDueFromToRelatedPartyCurrent

us-gaap:RestrictedCashAndCashEquivalentsAtCarryingValue
dei:LegalEntity
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:ConsolidatedEntities

us-gaap:RetainedEarningsUnappropriated

us-gaap:RevenueRemainingPerformanceObligation
aep:RecognitionPeriod
aep:RecognitionPeriod, dei:LegalEntity
dei:LegalEntity

us-gaap:SecuredDebt
dei:LegalEntity
dei:LegalEntity, us-gaap:BalanceSheetLocation, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
dei:LegalEntity, us-gaap:RetirementPlanType
us-gaap:SecuritiesLoaned
us-gaap:RetirementPlanType

us-gaap:SecuritiesReceivedAsCollateral
dei:LegalEntity

us-gaap:SecuritizedRegulatoryTransitionAssetsNoncurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
us-gaap:AwardType
us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested

us-gaap:ShortTermBankLoansAndNotesPayable
dei:LegalEntity

us-gaap:ShortTermBorrowings

us-gaap:ShortTermDebtWeightedAverageInterestRate

us-gaap:ShortTermNonBankLoansAndNotesPayable
dei:LegalEntity

us-gaap:SpentNuclearFuelObligationNoncurrent
dei:LegalEntity
dei:LegalEntity, us-gaap:LossContingenciesByNatureOfContingency
us-gaap:LossContingenciesByNatureOfContingency
dei:LegalEntity, us-gaap:IncomeTaxAuthority
us-gaap:TaxCreditCarryforwardAmount
us-gaap:IncomeTaxAuthority

us-gaap:TransfersAccountedForAsSecuredBorrowingsAssetsCarryingAmount

us-gaap:TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount

us-gaap:TreasuryStockShares

us-gaap:UnamortizedDebtIssuanceExpense
dei:LegalEntity

us-gaap:UnbilledReceivablesCurrent
dei:LegalEntity

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate

us-gaap:UnsecuredDebt
dei:LegalEntity
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:VariableInterestEntityEntityMaximumLossExposureAmount
dei:LegalEntity, us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities, us-gaap:StatementEquityComponents
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities, us-gaap:StatementEquityComponents

Plots across concepts


IncomeStatement
Other Comprehensive Income Loss Net Of Tax
Expenses
Other Nonoperating Income Expense
Balance Sheet
Goodwill
Assets
Cash And Cash Equivalents At Carrying Value
Current Assets
Prepaid Expense And Other Assets Current
NonCurrent Assets
Goodwill
PropertyPlantAndEquipmentNet
Accumulated Depreciation Depletion And Amortization Property Plant And Equipment
Liabilities
Derivative Liabilities
Current Liabilities
Operating Lease Liability Current
Noncurrent Liabilities
Minority Interest
Stockholders Equity
Accumulated Other Comprehensive Income Loss Net Of Tax
Per Share
Common Stock Dividends Per Share Declared
CashFlow
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInOperatingActivities
Increase Decrease In Inventories
NetCashProvidedByUsedInInvestingActivities
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInFinancingActivities
Proceeds From Payments For Other Financing Activities
Shares
Treasury Stock Shares
OperatingLeaseLiability
Operating Lease Liability Current
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Undiscounted Excess Amount
AccountsReceivable
Allowance For Doubtful Accounts Receivable Current

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:CommonStockValue ██▇▇▆▆▆▆▆▆▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▄▄▄▄▄▄▃▃▃▃▃▃▂▂▂▂▁▁3382.73376.43359.33357.63355.43350.23343.43341.93340.83338.63337.43336.53335.43332.73329.43328.33328.33328.33328.33328.33328.03325.33324.03322.03321.03317.03313.03312.03308.03305.03303.03299.03296.03291.03289.03286.03284.03280.03274.03271.03266.03263.03257.0NANANA3239.0NANANA
us-gaap:CommonStockSharesIssued ██▇▇▆▆▆▆▆▆▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▄▄▄▄▄▄▃▃▃▃▃▂▂▂▂▂▁▁520.42213519.450026516.808354516.551408516.214732515.411847514.373631514.140235513.962056513.632124513.450036513.301636513.130857512.71617512.210644512.048663512.048663512.048663512.04852512.046044511.999477511.57997511.389173511.141256510.884774510.266134509.739159509.563446508.90234508.397086508.113964507.59443507.071824506.356262506.004962505.552303505.165281504.566633503.75946503.177402502.534747502.009606501.114881NANANA498.333265NANANA
 us-gaap:CommonStockSharesAuthorized dei:LegalEntity aep:SouthwesternElectricPowerCo▁▁▁▁█████████████████████████████████████0.003680.003680.003680.003687.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.6NA7.6NANANANANANANA
 us-gaap:CommonStockSharesOutstanding dei:LegalEntity aep:SouthwesternElectricPowerCo▁▁▁▁█████████████████████████████████████0.003680.003680.003680.003687.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.53664NA7.53664NANANANANANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding █▁500.983778498.164219NA497.458523497.33798496.608918NA495.461509495.382966494.484144NA493.940543493.5493.1273NA493.0492.6492.031975NA491.8491.6414491.332305NA490.800335490.48445489.936726NA488.970647488.538227488.271167NA487.258905486.763615486.344036NA485.362858484.86069484.248868NA482.796945482.203255481.365806NA479.750447479.176543478.844632NANANANA
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic █▁499.91664497.058635NA496.177968495.655053494.596869NA493.839034493.584347493.309076NA493.0492.7492.267402NA491.840722491.790752491.712042NA491.7491.459541491.108392NA490.648929490.207482489.597986NA488.912892488.291576487.867089NA486.932747486.293026485.823668NA484.979543484.500029483.828101NA482.498734481.928494481.14427NA479.578139479.050774478.429535NANANANA
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount NA0.0NANANA0.697NANANA0.0NANANA0.0NANANA0.0NANANA0.0NANANA0.0NANANA0.0NANANA0.0NANANA0.0NANANA0.13625NANANANANANANANA
us-gaap:EarningsPerShareBasic ▆▆▆▇▆▆▅▇▆▆▆▆▆▆▆▆▆▇▆▁▆▆▆▆▆▇▅▆▆▆▆▆▆▆▄▆▆▆▅█▆▆▅▆▅▆▅▆▅▆1.161.160.88000000000000031.511.051.00.310000000000000051.490.931.160.731.171.070.920.82000000000000031.110.761.20.76-1.561.021.020.951.060.881.290.391.010.81.150.710.890.690.750.051.00.750.80.631.920.730.730.371.160.280.720.490.930.670.89
us-gaap:EarningsPerShareDiluted ▆▆▆▇▆▆▅▇▆▆▆▆▆▆▆▆▆▇▆▁▆▆▆▆▆▇▅▆▆▆▆▆▆▆▄▆▆▆▅█▆▆▅▆▅▆▅▆▅▆1.151.150.87000000000000011.51.051.00.310000000000000051.480.931.160.73999999999999981.171.070.920.811.10.761.20.76-1.561.021.020.951.060.881.290.391.010.81.150.710.890.690.750.051.00.750.80.631.920.730.730.371.160.280.720.490.930.670.89
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
 COGS Ratio dei:LegalEntity,us-gaap:ProductOrService aep:AppalachianPowerCo,us-gaap:ElectricityGenerationNANANA28.024.033.0NA32.030.035.0NA30.029.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 EBT Margin dei:LegalEntity aep:AEPTexasInc.▄▂▂▅▄▅▃█▆▃▄▅▃▂▂▅▃▁398.5364.2361.8432.0401.5423.6391.3489.3438.0390.7402.0433.4388.3371.6374.1431.2389.5343.6NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 EBT Margin dei:LegalEntity aep:AEPTransmissionCo██▆▆▄▆▅▅▅▅▃▃▃▃▃▂▄▂▁▁▂365.5361.7307.9304.1238.1295.6251.3259.7266.9243.5189.9194.4183.8193.5173.8167.3229.4152.7120.0125.3153.1NANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 EBT Margin dei:LegalEntity aep:AppalachianPowerCo▂▅▂▃▁▃▃▄▁▄▃▄▂▅▃▃▂▄▃▄▂▅▁▃▂▇▃▃▂▇▆▆▃█▇▆▃▅▄▆▄▅▅▆▂677.0817.0673.6735.7637.5749.4720.6755.5655.8792.8718.1762.0667.0820.4746.8719.3675.3792.8729.5778.2673.5820.0655.0727.558681.98899.015735.135709.884694.668913.391869.675849.733746.504951.494890.796864.198716.461805.476763.624858.336751.445831.82804.584840.622703.274NANANANANA
 EBT Margin dei:LegalEntity aep:IndianaMichiganPowerCo▆▅▄▆▄▅▄▇▄▇▅█▆▅▄▅▁▅▃▆▃▄▂▅▄▆▄▄▄█▆█▄▆▄▆▃▄▃▇▃▅▃▇▃583.8564.5538.2586.7546.6570.3538.2611.1543.1614.3574.5629.7589.7576.8535.7557.7467.3560.5514.9597.6522.4532.7487.3568.362544.274586.311531.141542.863533.876641.854595.1638.865549.501583.393544.824598.204510.876546.207521.568611.232521.478560.492524.506608.25509.915NANANANANA
 EBT Margin dei:LegalEntity aep:OhioPowerCo▁▁▁▁▁▁▁▁▁▂▁▂▂▂▁▁▁▁▁▂▁▂▁▂▁▂▂▂▂▂▃▃▃▃▃▃▃▃▃▂▂▄█▂▁704.9723.9677.4000000000002741.0640.4690.3643.6710.6606.6836.8745.4778.3748.8790.9731.9742.0663.9746.1588.2871.3730.8763.6692.2782.284705.754918.44871.37839.197786.161880.1921146.6551279.1761102.9941233.791217.4071359.8161113.751237.2231211.132907.043779.9711394.192816.02855.859721.964NANANANANA
 EBT Margin dei:LegalEntity aep:PublicServiceCoOfOklahoma▄▃▂▅▃▃▃█▄▄▃█▅▄▄▇▄▃▂▅▃▂▂▆▃▃▃▆▃▃▃▆▃▂▁▅▃▃▂▇▃▂▂▆▃344.5296.1278.0382.2308.6297.3307.9493.0348.1332.8330.8481.4398.3336.8335.6442.8344.7304.1273.6401.7300.2274.3292.6420.363319.504306.772314.385416.991318.815301.385297.463411.083324.687262.289242.224372.872317.311300.531289.211457.586328.588288.003281.652426.569327.686NANANANANA
 EBT Margin dei:LegalEntity aep:SouthwesternElectricPowerCo▃█▃▆▃▂▃▆▂▃▃▆▄▃▃▆▃▃▃▆▃▂▂▆▄▃▃▆▄▄▃▆▃▂▁▅▂▁▁▆▃▂▁▅▂430.1616.1420.3517.3415.0385.9408.8545.5375.5421.1410.1535.3457.1419.4436.3517.6424.7401.3402.3539.7427.0379.0378.6532.499438.037431.709424.753531.771449.283440.59428.38552.933420.173394.317352.733485.169390.946348.986356.355534.982399.534362.955338.281480.982361.467NANANANANA
 Net profit Margin dei:LegalEntity aep:AEPTexasInc.▄▂▂▅▄▅▄█▆▄▄▆▄▃▃▅▄▂▂▄▃▁398.5364.2361.8432.0401.5423.6391.3489.3438.0390.7402.0433.4388.3371.6374.1431.2389.5343.6362.0403.9365.0330.5NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 Net profit Margin dei:LegalEntity aep:AEPTransmissionCo██▇▆▅▆▅▅▆▅▄▄▄▄▃▃▅▃▂▂▃▁365.5361.7307.9304.1238.1295.6251.3259.7266.9243.5189.9194.4183.8193.5173.8167.3229.4152.7120.0125.3153.179.6NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 Net profit Margin dei:LegalEntity aep:AppalachianPowerCo▂▅▂▃▁▃▃▄▁▄▃▄▂▅▃▃▂▄▃▄▂▅▁▃▂▇▃▃▂▇▆▆▃█▇▆▃▅▄▆▄▅▅▆▂677.0817.0673.6735.7637.5749.4720.6755.5655.8792.8718.1762.0667.0820.4746.8719.3675.3792.8729.5778.2673.5820.0655.0727.558681.98899.015735.135709.884694.668913.391869.675849.733746.504951.494890.796864.198716.461805.476763.624858.336751.445831.82804.584840.622703.274NANANANANA
 Net profit Margin dei:LegalEntity aep:IndianaMichiganPowerCo▆▅▄▆▄▅▄▇▄▇▅█▆▅▄▅▁▅▃▆▃▄▂▅▄▆▄▄▄█▆█▄▆▄▆▃▄▃▇▃▅▃▇▃583.8564.5538.2586.7546.6570.3538.2611.1543.1614.3574.5629.7589.7576.8535.7557.7467.3560.5514.9597.6522.4532.7487.3568.362544.274586.311531.141542.863533.876641.854595.1638.865549.501583.393544.824598.204510.876546.207521.568611.232521.478560.492524.506608.25509.915NANANANANA
 Net profit Margin dei:LegalEntity aep:OhioPowerCo▁▁▁▁▁▁▁▁▁▂▁▂▂▂▁▁▁▁▁▂▁▂▁▂▁▂▂▂▂▂▃▃▃▃▃▃▃▃▃▂▂▄█▂▁704.9723.9677.4000000000002741.0640.4690.3643.6710.6606.6836.8745.4778.3748.8790.9731.9742.0663.9746.1588.2871.3730.8763.6692.2782.284705.754918.44871.37839.197786.161880.1921146.6551279.1761102.9941233.791217.4071359.8161113.751237.2231211.132907.043779.9711394.192816.02855.859721.964NANANANANA
 Net profit Margin dei:LegalEntity aep:PublicServiceCoOfOklahoma▄▃▂▅▃▃▃█▄▄▃█▅▄▄▇▄▃▂▅▃▂▂▆▃▃▃▆▃▃▃▆▃▂▁▅▃▃▂▇▃▂▂▆▃344.5296.1278.0382.2308.6297.3307.9493.0348.1332.8330.8481.4398.3336.8335.6442.8344.7304.1273.6401.7300.2274.3292.6420.363319.504306.772314.385416.991318.815301.385297.463411.083324.687262.289242.224372.872317.311300.531289.211457.586328.588288.003281.652426.569327.686NANANANANA
 Net profit Margin dei:LegalEntity aep:SouthwesternElectricPowerCo▃█▃▆▃▂▃▆▂▃▃▆▄▃▃▆▃▃▃▆▃▂▂▆▄▃▃▆▄▄▃▆▃▂▁▅▂▁▁▆▃▂▁▅▂430.1616.1420.3517.3415.0385.9408.8545.5375.5421.1410.1535.3457.1419.4436.3517.6424.7401.3402.3539.7427.0379.0378.6532.499438.037431.709424.753531.771449.283440.59428.38552.933420.173394.317352.733485.169390.946348.986356.355534.982399.534362.955338.281480.982361.467NANANANANA
 Net profit Margin dei:LegalEntity,us-gaap:StatementBusinessSegments aep:AEPTransmissionCo,aep:StateTranscos██▆▆▄▆▅▅▅▅▃▃▃▃▃▂▄▂▁▁▂365.5361.7307.9304.1238.1295.6251.3259.7266.9243.5189.9194.4183.8193.5173.8167.2229.5152.7120.0125.3153.1NANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 Net profit Margin us-gaap:StatementBusinessSegments aep:GenerationAndMarketing▁▃▁▂▁▁▁▂▁▂▂▂▂▂▁▂▁▃▄▅▃▄▃▅▄▇▄▅▅█▅▆▅▅436.6634.2420.1490.0376.9438.6429.4533.7412.7481.8452.9521.6460.7505.1407.6465.5410.6591.4694.8859.4683.8748.0606.7835.0801.01170.0785.0901.0913.01251.0852.01001.0892.0920.0NANANANANANANANANANANANANANANANA
 Net profit Margin us-gaap:StatementBusinessSegments aep:TransmissionAndDistributionCompanies▄▄▃▆▃▄▃▆▃▇▅▇▅▆▄▆▃▄▁█▄▄▃▆▃█▇▇▅▇▄▆▃▅1103.41088.11039.21165.31034.51106.91028.21186.61045.71222.01142.21211.51137.01162.41106.11173.31053.51086.4953.91275.61096.11096.81036.61189.01061.01270.01234.01231.01134.01215.01085.01195.01064.01134.0NANANANANANANANANANANANANANANANA
 Net profit Margin us-gaap:StatementBusinessSegments aep:TransmissionOperations██▇▇▆▇▆▆▆▆▅▄▅▅▄▄▆▄▃▃▄▃▃▃▃▂▂▂▂▂▂▁▁▁▁▁▁▁▁378.2377.0321.0317.9249.7310.2264.9273.0278.9256.4198.9187.2212.5205.5184.8178.5247.3156.1130.1132.4161.788.684.288.099.058.052.055.057.028.060.08.07.03.02.03.01.01.02.0NA1.0NANANANANANANANANA
 Net profit Margin us-gaap:StatementBusinessSegments aep:VerticallyIntegratedUtilities▃▆▂▅▂▃▃▇▂▅▃▇▄▅▄▆▂▄▂▆▂▃▁▅▃▆▃▅▃▇▅█▄▆2260.62537.32125.92434.82092.02226.72194.52645.52123.82403.32251.82636.72349.02408.02298.92482.22120.52290.42164.12556.32125.92245.62013.22471.02183.02505.02196.02450.02252.02586.02437.02738.02302.02515.0NANANANANANANANANANANANANANANANA
 Operating Margin dei:LegalEntity aep:AEPTexasInc.▄▂▂▅▄▅▄█▆▄▄▆▄▃▃▅▄▂▂▄▃▁398.5364.2361.8432.0401.5423.6391.3489.3438.0390.7402.0433.4388.3371.6374.1431.2389.5343.6362.0403.9365.0330.5NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 Operating Margin dei:LegalEntity aep:AEPTransmissionCo██▇▆▅▆▅▅▆▅▄▄▄▄▃▃▅▃▂▂▃▁365.5361.7307.9304.1238.1295.6251.3259.7266.9243.5189.9194.4183.8193.5173.8167.3229.4152.7120.0125.3153.179.6NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 Operating Margin dei:LegalEntity aep:AppalachianPowerCo▂▅▂▃▁▃▃▄▁▄▃▄▂▅▃▃▂▄▃▄▂▅▁▃▂▇▃▃▂▇▆▆▃█▇▆▃▅▄▆▄▅▅▆▂677.0817.0673.6735.7637.5749.4720.6755.5655.8792.8718.1762.0667.0820.4746.8719.3675.3792.8729.5778.2673.5820.0655.0727.558681.98899.015735.135709.884694.668913.391869.675849.733746.504951.494890.796864.198716.461805.476763.624858.336751.445831.82804.584840.622703.274NANANANANA
 Operating Margin dei:LegalEntity aep:IndianaMichiganPowerCo▆▅▄▆▄▅▄▇▄▇▅█▆▅▄▅▁▅▃▆▃▄▂▅▄▆▄▄▄█▆█▄▆▄▆▃▄▃▇▃▅▃▇▃583.8564.5538.2586.7546.6570.3538.2611.1543.1614.3574.5629.7589.7576.8535.7557.7467.3560.5514.9597.6522.4532.7487.3568.362544.274586.311531.141542.863533.876641.854595.1638.865549.501583.393544.824598.204510.876546.207521.568611.232521.478560.492524.506608.25509.915NANANANANA
 Operating Margin dei:LegalEntity aep:OhioPowerCo▁▁▁▁▁▁▁▁▁▂▁▂▂▂▁▁▁▁▁▂▁▂▁▂▁▂▂▂▂▂▃▃▃▃▃▃▃▃▃▂▂▄█▂▁704.9723.9677.4000000000002741.0640.4690.3643.6710.6606.6836.8745.4778.3748.8790.9731.9742.0663.9746.1588.2871.3730.8763.6692.2782.284705.754918.44871.37839.197786.161880.1921146.6551279.1761102.9941233.791217.4071359.8161113.751237.2231211.132907.043779.9711394.192816.02855.859721.964NANANANANA
 Operating Margin dei:LegalEntity aep:PublicServiceCoOfOklahoma▄▃▂▅▃▃▃█▄▄▃█▅▄▄▇▄▃▂▅▃▂▂▆▃▃▃▆▃▃▃▆▃▂▁▅▃▃▂▇▃▂▂▆▃344.5296.1278.0382.2308.6297.3307.9493.0348.1332.8330.8481.4398.3336.8335.6442.8344.7304.1273.6401.7300.2274.3292.6420.363319.504306.772314.385416.991318.815301.385297.463411.083324.687262.289242.224372.872317.311300.531289.211457.586328.588288.003281.652426.569327.686NANANANANA
 Operating Margin dei:LegalEntity aep:SouthwesternElectricPowerCo▃█▃▆▃▂▃▆▂▃▃▆▄▃▃▆▃▃▃▆▃▂▂▆▄▃▃▆▄▄▃▆▃▂▁▅▂▁▁▆▃▂▁▅▂430.1616.1420.3517.3415.0385.9408.8545.5375.5421.1410.1535.3457.1419.4436.3517.6424.7401.3402.3539.7427.0379.0378.6532.499438.037431.709424.753531.771449.283440.59428.38552.933420.173394.317352.733485.169390.946348.986356.355534.982399.534362.955338.281480.982361.467NANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
 TTM Greenblatt ROC _ _▇▇▆▇▇▇▅▇▆▇▆▇▇▇▇█▇█▆▁▇▇▆▇▇█▆▇▇█▇▇▆▇▅▇▇▇▆▇▇▇▆█▆▇▆809.9810.3570.2943.2722.7751.6294.7958.2551.0788.4551.1668.6757.0706.0742.2986.5744.71097.1575.9-1127.9866.2892.9466.4960.0809.01124.0499.0925.0767.01041.0678.0875.0547.0755.0249.0912.0741.0754.0343.0890.0717.0832.0486.01025.0394.0758.0481.0NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:ComprehensiveIncomeNetOfTax ▇▇▆▇▇▆▅▇▆▆▆▇▆▆▆▆▆▇▆▁▆▆▆▆▆▇▅▆▆▇▆▆▆▆▅▆▆▆▅█▆▆706.0629.3485.8786.1564.4426.4193.7776.3381.3542.5329.0586.4529.0455.7508.3530.9384.4577.5362.9-793.7518.0494.5450.1512.0431.0624.0193.0492.0395.0566.0532.0440.0331.0394.0138.0508.0359.0387.0221.0911.0363.0362.0NANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest ▂▅▃▃▁▅▃▄▃▄▄▄▄▄▄█▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▃▄▄▄▃▄▄▄-4.43.8-0.8-0.4-6.34.1-0.80.4-2.21.31.42.11.72.31.112.01.22.01.81.61.81.91.21.01.02.01.01.01.01.01.01.01.01.00.01.01.01.00.01.01.01.0NANANANANANANANA
 us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest dei:LegalEntity aep:SouthwesternElectricPowerCo▁▂▁▁▁▂▁▁▂▂▁▂▂▂▁█▁▂▁▂▂▂▁▂▁▂▁▂▂▂▁▂▂▂▁▁▂▂▁▂▂▂0.61.00.80.70.41.00.50.81.11.20.91.41.11.60.211.00.61.00.81.11.11.10.6981.0130.9561.0330.8531.1091.1261.1020.8041.0581.0561.090.5230.9551.0611.0830.71.0231.0361.082NANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest ▇▇▆▇▇▆▅▇▆▆▆▇▆▆▆▆▆▇▆▁▆▆▆▆▆▇▅▆▆▇▆▆▆▆▅▆▆▆▅█▆▆▅▇▅▆701.6633.1485.0785.7558.1430.5192.9776.7379.1543.8330.4588.5530.7458.0509.4542.9385.6579.5364.7-792.1519.8496.4451.3513.0432.0626.0194.0493.0396.0567.0533.0441.0332.0395.0138.0509.0360.0388.0221.0912.0364.0363.0161.0565.0129.0356.0NANANANA
 us-gaap:CostOfGoodsAndServicesSold dei:LegalEntity,us-gaap:ProductOrService aep:AEPTexasInc.,us-gaap:ElectricityGenerationNANA0.110.43.20.02.011.28.59.410.613.25.88.93.78.3NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold dei:LegalEntity,us-gaap:ProductOrService aep:AppalachianPowerCo,us-gaap:ElectricityGeneration▃▄▁▄▄▃▂▅▄▅▂█▄▁▂▅137.2163.982.39999999999993166.0153.9111.085.7177.3161.2183.3101.2263.4155.369.099.0178.6NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold dei:LegalEntity,us-gaap:ProductOrService aep:AppalachianPowerCo,us-gaap:ElectricityPurchased▂▃▄▂▁▄▅▂▂▄▆▂▂█▅▁75.990.1119.867.550.4122.6137.678.364.5110.6152.780.464.5205.9140.561.1NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold dei:LegalEntity,us-gaap:ProductOrService aep:IndianaMichiganPowerCo,us-gaap:ElectricityGeneration▄▃▁▃▄▄▂▅▃▅▆█▆▆▅▆49.936.316.044.448.453.229.461.242.457.671.595.973.477.556.976.4NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold dei:LegalEntity,us-gaap:ProductOrService aep:IndianaMichiganPowerCo,us-gaap:ElectricityPurchased▂▄▅▂▂▄█▃▄█▅▄▇▅▄▁39.747.354.137.540.550.169.044.848.969.654.148.963.255.651.032.9NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold dei:LegalEntity,us-gaap:ProductOrService aep:OhioPowerCo,us-gaap:ElectricityPurchased▄▆▃▄▁▄▄▄▂▆▄▅▅█▆▆153.6175.3136.9149.3113.9149.1153.3158.3121.5174.2149.9166.3162.9205.5180.5180.7NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold dei:LegalEntity,us-gaap:ProductOrService aep:PublicServiceCoOfOklahoma,aep:PurchasedElectricityFuelAndOtherConsumablesUsedForElectricGeneration█▁124.0120.9NANA97.4127.3NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold dei:LegalEntity,us-gaap:ProductOrService aep:PublicServiceCoOfOklahoma,us-gaap:ElectricityGenerationNANA-20.620.9-1.616.913.998.444.838.029.0104.458.748.418.777.9NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold dei:LegalEntity,us-gaap:ProductOrService aep:PublicServiceCoOfOklahoma,us-gaap:ElectricityPurchasedNANA113.8104.799.0110.4118.2115.3102.5122.9127.6116.8113.1122.4135.1127.8NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold dei:LegalEntity,us-gaap:ProductOrService aep:SouthwesternElectricPowerCo,aep:PurchasedElectricityFuelAndOtherConsumablesUsedForElectricGeneration▁█138.5299.8NANA126.6132.2NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold dei:LegalEntity,us-gaap:ProductOrService aep:SouthwesternElectricPowerCo,us-gaap:ElectricityGenerationNANA137.1131.785.689.172.6148.8117.9133.5108.9152.1114.5126.8106.3147.5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold dei:LegalEntity,us-gaap:ProductOrService aep:SouthwesternElectricPowerCo,us-gaap:ElectricityPurchasedNANA35.941.041.043.169.044.833.132.644.436.653.442.750.040.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold us-gaap:ProductOrService aep:PurchasedElectricityFuelAndOtherConsumablesUsedForElectricGeneration▁█1124.01560.7NANA964.91151.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold us-gaap:ProductOrService us-gaap:ElectricityGenerationNANA264.4459.3360.3355.3278.4631.2480.9550.4450.3840.4566.9501.8481.2707.4NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold us-gaap:ProductOrService us-gaap:ElectricityPurchasedNANA789.0741.1604.6795.7858.8783.9660.7861.8875.4784.7776.7990.3808.4718.1NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments ▇▇▆▇▇▇▅▇▆▇▆▆▇▇▇▇▇█▆▁▇▇▆▇▇█▆▇▇█▇▇▆▇▅▇▇▇▆█▇▇▆▇▆▇604.6604.8389.7732.3507.9516.288.1759.3387.3600.1368.8480.9583.6540.2554.4800.6550.8910.4407.1-1323.9678.8713.6292.9775.0631.0940.0318.0739.0583.0850.0492.0680.0393.0545.0-6.0715.0543.0570.0235.0984.0521.0627.0287.0812.0201.0549.0NANANANA
us-gaap:IncomeTaxExpenseBenefit ▆▆▅▅▅▆▅▆▅▆▅▅▆▆▇▇▇█▆▁▇▇▆▇▇█▆▇▇█▇▇▆▇▅▇▇▇▆█▇▇▆▇▆▇61.254.5-17.4-1.212.646.5-43.640.6-54.444.521.8-80.772.2102.0171.9264.0190.6343.260.3-534.5165.0235.592.6275.0225.0333.0151.0269.0215.0307.0164.0257.068.0195.0-16.0241.0190.0189.032.0334.0174.0278.0113.0258.065.0207.0NANANANA
us-gaap:IncomeTaxesPaidNet ▆▆▆▆▆▆▆▆▆▆▆▅▆▆▆▆▇▅▆▆▆▆▆▆▇▆▆▆▇▆▆▅▆▆▅▆▆▅▆▄▆▆▆▁█▆8.8-0.2-25.2-27.03.7-0.6-16.73.120.3-0.63.2-61.734.7-0.95.714.467.6-88.8-2.76.018.97.34.218.096.02.08.046.069.0-6.09.0-54.09.0-19.0-38.0-2.023.0-65.01.0-134.013.02.0-25.0-417.0176.0-2.0NANANANA
us-gaap:InterestExpense █▇▇▇▇▇▇▆▄▄▄▅▃▃▂▂▂▂▁▂▂▂▁▂▂▂▂▂▂▂▂▂▂▃▇▃▃▂▁▃▃▃▄▄▄▄301.6290.2288.3291.3294.0292.1290.9275.1250.7255.8251.3256.8242.3234.0227.0223.3222.9221.8210.0225.3224.9217.0214.9221.0224.0223.0223.0221.0221.0220.0221.0225.0228.0232.0291.0233.0235.0229.0210.0242.0239.0242.0249.0251.0249.0250.0NANANANA
us-gaap:InterestPaidNet █▃█▃▅▃█▂▇▁▇▁▅▂▄▁▄▃▃▃▃▂▃▃▃▃▂▃▂▄▁▄▂▄▄▄▁▅▂▅▂▄▂▅▃▅339.4220.5338.5999999999999209.3268.6212.6332.8199.5321.3168.9308.0175.9267.4188.0244.5171.5236.4205.9211.5211.6226.4199.0218.2208.0208.0223.0189.0227.0188.0234.0180.0247.0202.0253.0233.0254.0179.0265.0184.0274.0192.0250.0203.0268.0216.0271.0NANANANA
us-gaap:NetIncomeLossAttributableToNoncontrollingInterest ▂▅▃▃▁▅▃▄▃▄▄▄▄▄▄█▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▃▄▄▄▃▄▄▄▄▄▄▄-4.43.8-0.8-0.4-6.34.1-0.80.4-2.21.31.42.11.72.31.112.01.22.01.81.61.81.91.21.01.02.01.01.01.01.01.01.01.01.00.01.01.01.00.01.01.01.01.01.01.01.0NANANANA
 us-gaap:NetIncomeLossAttributableToNoncontrollingInterest dei:LegalEntity aep:SouthwesternElectricPowerCo▁▂▁▁▁▂▁▁▂▂▁▂▂▂▁█▁▂▁▂▂▂▁▂▁▂▁▂▂▂▁▂▂▂▁▁▂▂▁▂▂▂▁▁▂0.61.00.80.70.41.00.50.81.11.20.91.41.11.60.211.00.61.00.81.11.11.10.6981.0130.9561.0330.8531.1091.1261.1020.8041.0581.0561.090.5230.9551.0611.0830.71.0231.0361.0820.8950.7741.273NANANANANA
 us-gaap:NetIncomeLossAttributableToNoncontrollingInterest dei:LegalEntity,us-gaap:StatementEquityComponents aep:SouthwesternElectricPowerCo,us-gaap:NoncontrollingInterest▁█0.61.0NA0.70.41.0NA0.81.11.20.91.41.11.60.211.00.61.00.81.11.11.10.6981.0130.9561.0330.8531.1091.1261.1020.8041.0581.0561.090.5230.9551.0611.0830.7NANANANANANANANANANANA
 us-gaap:NetIncomeLossAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents us-gaap:NoncontrollingInterest▁█-4.43.8NA-0.4-6.34.1NA0.4-2.21.31.42.11.72.31.112.01.22.01.81.61.81.91.21.01.02.01.01.01.01.01.01.01.01.00.01.01.01.00.01.01.01.0NANANANANANANANA
us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic ▇▇▆▇▆▆▅▇▆▇▆▇▆▆▆▆▆▇▆▁▆▆▆▆▆▇▅▆▆▆▆▆▆▆▄▆▆▆▅█▆▆▅▆▅▆▅▆▅▆578.2575.0435.5748.6520.8495.2153.5733.5461.3572.8363.4577.6528.4454.4400.7544.7375.0592.2373.4-765.8502.1501.2469.6519.0430.0629.0191.0493.0390.0560.0346.0433.0338.0363.021.0487.0362.0389.0308.0928.0352.0353.0176.0555.0136.0344.0238.0443.0316.0360.0
us-gaap:OperatingExpenses ▂▃▂▂▁▂▂▂▂▂▂▃▂▂▂▂▁▁▂█▂▂▂▃▂▃▃▂▂▃▂▂▂▂▂▂▁▁▂▃▁▁▁▂▁▁3016.63470.83040.43123.22771.32995.93321.33356.83022.63268.43250.03664.53256.23342.33068.23118.22831.82836.23214.25780.13026.73152.03148.73472.03133.03584.03527.03377.03277.03607.03095.03301.03035.03071.03364.03244.02810.02871.03101.03443.02892.02898.02948.03039.02966.02811.0NANANANA
us-gaap:OperatingIncomeLoss ▇▇▆▇▇▇▅▇▆▇▆▇▇▇▇█▇█▆▁▇▇▆▇▇█▆▇▇█▇▇▆▇▅▇▇▇▆▇▇▇▆█▆▇▆▇▇▇809.9810.3570.2943.2722.7751.6294.7958.2551.0788.4551.1668.6757.0706.0742.2986.5744.71097.1575.9-1127.9866.2892.9466.4960.0809.01124.0499.0925.0767.01041.0678.0875.0547.0755.0249.0912.0741.0754.0343.0890.0717.0832.0486.01025.0394.0758.0481.0858.0682.0750.0
us-gaap:OtherComprehensiveIncomeLossNetOfTax ▇▅▅▄▄▂▄▄▁▃▂▄▃▃▆▃▄▃▃▃▄▃▃▃▃▃▃▃▃▃█▃▃▄▆▄▃▃▁▃127.854.350.337.543.6-68.840.242.8-80.0-30.3-34.48.80.61.3107.6-13.89.4-14.7-10.5-27.915.9-6.7-19.0-7.01.0-5.02.0-1.05.06.0186.07.0-7.031.0117.021.0-3.0-2.0-90.0-18.0NANANANANANANANANANA
us-gaap:OtherNonoperatingIncomeExpense ▇▅█▃▄▁▃▂▃▃▂▃▃▃33.121.741.65.514.3-4.48.23.26.68.6-0.36.36.75.5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ProfitLoss ▇▇▆▇▆▆▅▇▆▇▆▇▆▆▆▆▆▇▆▁▆▆▆▆▆▇▅▆▆▆▆▆▆▆▄▆▆▆▅█▆▆▅▆▅▆▅▆▅▆573.8578.8434.7748.2514.5499.3152.7733.9459.1574.1364.8579.7530.1456.7401.8556.7376.2594.2375.2-764.2503.9503.1470.7520.0431.0631.0192.0494.0391.0561.0347.0434.0339.0364.021.0488.0363.0390.0311.0930.0353.0355.0178.0557.0137.0346.0239.0446.0317.0363.0
us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax ▄▆▃▅▂▄▃▆▃▅▄▆▅▅▄▅▃▄▄█▄▅▃▇▄█▅▆▅█▄▆▃▄▃▅▃▃▂▆▃▃▂▅▂▃▁▃▁▂3826.54281.13610.64066.43494.03747.53616.04315.03573.64056.83801.14333.14057.44038.93810.44104.73576.53933.33790.14652.23892.94044.93614.74432.03942.04708.04026.04302.04044.04648.03773.04176.03582.03826.03613.04156.03551.03625.03444.04333.03609.03730.03434.04064.03360.03569.03282.03547.03202.03458.0
us-gaap:Revenues ▄▆▃▅▂▄▃▆▃▅▄▆▅▅▄▅▃▄▄█▄▅▃▇▄█▅▆▅█▄▆▃▄▃▅▃▃▂▆▃▃▂▅▂▃▁▃▁▂3826.54281.13610.64066.43494.03747.53616.04315.03573.64056.83801.14333.14013.24048.33810.44104.73576.53933.33790.14652.23892.94044.93614.74432.03942.04708.04026.04302.04044.04648.03773.04176.03582.03826.03613.04156.03551.03625.03444.04333.03609.03730.03434.04064.03360.03569.03282.03547.03202.03458.0
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:Assets ██▇▇▇▇▆▆▆▅▅▅▄▄▄▄▄▃▄▃▄▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁84358.282985.180757.278689.377804.877724.075892.373900.772550.070722.068802.867617.466870.165609.564729.163964.962739.161728.363467.761442.063317.162486.561683.161099.060938.060038.059633.057925.057620.057038.056414.054963.054979.054550.054367.053843.053421.052902.052223.051187.050752.050560.050455.0NANANA48348.0NANANA
us-gaap:Liabilities ██▇▇▇▇▆▆▅▅▅▄▄▄▄▄▃▃▄▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁62663.461709.859937.557982.257393.857598.355870.553765.153001.051378.849634.648470.148024.747010.246403.645850.144884.144015.046047.644099.044912.244344.843778.243390.043496.042790.042809.041053.041035.040619.040328.039200.039442.039129.039130.038537.038413.038045.037558.036474.036753.036721.036773.0NANANA35147.0NANANA
us-gaap:LiabilitiesAndStockholdersEquity ██▇▇▇▇▆▆▆▅▅▅▄▄▄▄▄▃▄▃▄▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁84358.282985.180757.278689.377804.877724.075892.373900.772550.070722.068802.867617.466870.165609.564729.163964.962739.161728.363467.761442.063317.162486.561683.161099.060938.060038.059633.057925.057620.057038.056414.054963.054979.054550.054367.053843.053421.052902.052223.051187.050752.050560.050455.0NANANA48348.0NANANA
us-gaap:StockholdersEquity ██▇▇▇▇▆▆▆▆▆▆▆▅▅▅▅▅▄▄▅▅▅▅▄▄▄▄▄▄▃▃▃▃▂▃▂▂▂▂▁▁▁21378.720972.820550.920365.920007.419728.419632.219716.419259.619196.319028.419016.818722.318483.318287.018069.117824.117687.117397.017321.918386.218126.517891.717699.017434.017241.016820.016868.016581.016416.016085.015762.015537.015421.015237.015306.015007.014856.014664.014653.013939.013779.013622.0NANANA13140.0NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:AssetsCurrent ▄▃▃▃▃▆▂▃▂▂▂▄▄▃▃▂▂▁██▃▃▂▄▃▂▃▂▃▃▃▃▄▃▄▄▄▃▃▃▄▄▅4605.84258.44351.54338.24273.25292.04077.84166.44061.33914.84113.94692.44570.14135.04253.14067.83809.03616.46033.95949.24438.94146.34072.44548.04225.04116.04478.04111.04323.04335.04310.04317.04622.04397.04589.04648.04483.04214.04182.04374.04754.04789.05016.0NANANA4756.0NANANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▂▂▂▂▂█▂▂▁▂▂▄▁▁▁▂▁▁▁▁▂▁▁▁▁▁▁▁▁▂▁▁▁▁▂▃▂▂▂▃▂▃▂▆▅▄▃312.7273.2392.7409.7348.81554.6246.8348.8210.5227.7234.1788.3211.2183.4214.6343.9172.4175.0210.5212.2246.8190.4176.4178.0195.0190.0163.0194.0190.0292.0118.0147.0117.0179.0279.0443.0297.0286.0221.0546.0417.0625.0294.01090.0838.0818.0490.0NANANA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents ▁▁▂▂▂█▂▂▁▁▂▄▁▁▂▂▁▁▂359.7324.0438.3463.8504.71670.8432.6489.8389.6363.1444.1937.5387.3316.5412.6490.8344.3299.4403.5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ShortTermInvestments ▃▂▂▂▂▂▂▂▁▁▁▁▁▁▁▅▅▄▆▄▅▄▇▅▆▅▇▅▇▅▆▅▅▄▅▄▅▃▅▃▅▅█221.7199.1200.8209.0192.3185.2202.7198.4175.7168.9159.1164.1163.1167.9161.7310.7317.6275.0331.7279.2306.9264.5386.8315.0356.0293.0386.0318.0377.0310.0353.0288.0298.0261.0324.0278.0297.0217.0294.0240.0311.0296.0416.0NANANA363.0NANANA
us-gaap:AccountsReceivableNetCurrent ▆▃▃▃▃▂▂▃▃▄▄▆█▃▄▂▁▂▄▄▃▁▁▃▄▄▄▃▄▄▃▃▄▄▄▃▂▁▃▃▄▂▄2073.81858.41842.71850.71791.51741.51705.11825.11781.21882.31926.52118.12270.71851.51891.01740.91661.81711.21916.71880.01815.21650.01640.51853.01920.01889.01926.01855.01926.01943.01860.01856.01931.01869.01871.01855.01762.01670.01834.01860.01866.01749.01923.0NANANA1050.0NANANA
us-gaap:PrepaidExpenseAndOtherAssetsCurrent ▁▁▁▇▅▄▅▅▄▃▄▃▅▆▇█▄▂▇▂▂▁▂▂▄▂▆▃▄▂▅▅█▅▅▄▃▃▂▃▂133.9124.5127.0316.7241.5219.1242.1262.4233.9200.4208.8186.6243.1280.2310.4350.5224.4141.0325.5148.1145.2136.0172.4156.0210.0148.0278.0177.0229.0159.0246.0262.0337.0241.0241.0209.0179.0185.0165.0173.0172.0NA145.0NANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:AssetsNoncurrent ██▆▄▄▄▄▃▄▃▁▁▁▂▂▄▄▅▄▄▄▄▄▄▄▃▃▃▃▃▃▃▃▃▃▃▃▄▃▂▂▂▁14087.914030.612504.111564.711604.811383.111676.411041.611285.810838.69589.89569.39858.510109.410214.511580.611702.911875.611794.511230.611442.011507.311477.511313.011700.011112.011038.010750.011024.011173.011107.010776.010932.011023.011015.011062.011110.011256.011070.010396.09934.010005.09765.0NANANA9248.0NANANA
us-gaap:PropertyPlantAndEquipmentGross ██▇▇▇▇▆▆▆▅▅▅▄▄▄▃▃▃▃▂▄▄▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▁▁▁▁▁87056.385612.984313.082903.081704.280417.079145.777452.975642.074151.273085.271197.370012.968796.367428.565438.264134.862910.562036.660599.867082.466430.265481.464826.064602.065306.064305.063123.062065.061094.060285.059044.058357.058075.057454.057459.056784.056223.055670.055097.054669.054096.053740.0NANANA51684.0NANANA
us-gaap:ConstructionInProgressGross ▅▆▆▇▆▇▆█▇▇▆▇▇▇▆▅▄▄▄▅▄▅▅▅▅▅▄▄▃▃▂▂▂▂▁▄▃▃▄▄▃▂▃3879.34289.54025.74662.54386.64511.54319.85244.54944.54910.94393.94995.54630.34759.44120.73710.03336.83196.83183.93651.33509.93806.33903.94008.03651.03710.03218.03283.02886.02836.02471.02489.02173.02078.01819.03191.03020.02923.03121.03105.02714.02480.02758.0NANANA3031.0NANANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment █▇▇▆▆▅▅▄▄▄▃▃▃▃▂▂▂▁▁▁▆▆▅▆▆▇▆▆▆▅▅▅▅▅▄▅▅▄▄▄▄▄▃21391.820916.820411.420116.619777.419368.119007.618760.218439.118182.617986.117841.617571.417431.217167.017121.716907.616674.216397.316337.619646.219597.319348.219588.019589.020496.020188.020059.019792.019564.019288.019174.018932.018945.018691.019326.018956.018791.018699.018680.018605.018330.018066.0NANANA17340.0NANANA
us-gaap:PropertyPlantAndEquipmentNet ███▇▇▇▇▆▆▆▆▅▅▅▄▄▄▃▃▃▄▄▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▁▁▁▁▁▁65664.564696.163901.662786.461926.861048.960138.158692.757202.955968.655099.153355.752441.551365.150261.548316.547227.246236.345639.344262.247436.246832.946133.245238.045013.044810.044117.043064.042273.041530.040997.039870.039425.039130.038763.038133.037828.037432.036971.036417.036064.035766.035674.0NANANA34344.0NANANA
 us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures dei:LegalEntity,us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities aep:AEPTexasInc.,aep:CarryingAmountInAepServiceCorporationsAccountsPayableNANA30.5NANANA32.4NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures dei:LegalEntity,us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities aep:AEPTransmissionCo,aep:CarryingAmountInAepServiceCorporationsAccountsPayableNANA45.9NANANA33.4NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures dei:LegalEntity,us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities aep:AppalachianPowerCo,aep:CarryingAmountInAepServiceCorporationsAccountsPayableNANA42.8NANANA44.1NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures dei:LegalEntity,us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities aep:IndianaMichiganPowerCo,aep:CarryingAmountInAepGeneratingCompanysAccountsPayableNANA9.0NANANA10.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures dei:LegalEntity,us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities aep:IndianaMichiganPowerCo,aep:CarryingAmountInAepServiceCorporationsAccountsPayableNANA27.1NANANA28.6NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures dei:LegalEntity,us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities aep:OhioPowerCo,aep:CarryingAmountInAepServiceCorporationsAccountsPayableNANA33.9NANANA33.2NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures dei:LegalEntity,us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities aep:PublicServiceCoOfOklahoma,aep:CarryingAmountInAepServiceCorporationsAccountsPayableNANA15.7NANANA18.1NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures dei:LegalEntity,us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities aep:SouthwesternElectricPowerCo,aep:CarryingAmountInAepServiceCorporationsAccountsPayableNANA22.0NANANA23.4NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures dei:LegalEntity,us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities,us-gaap:StatementEquityComponents aep:SouthwesternElectricPowerCo,aep:DoletHillsLigniteCoLlc,aep:TotalInvestmentNANA28.0NANANA25.1NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures dei:LegalEntity,us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities,us-gaap:StatementEquityComponents aep:SouthwesternElectricPowerCo,aep:DoletHillsLigniteCoLlc,us-gaap:RetainedEarningsNANA20.4NANANA17.5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:Goodwill ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁██████████████▅▅▅▅▅52.552.552.552.552.552.552.552.552.552.552.552.552.552.552.552.552.552.552.552.552.552.552.553.091.091.091.091.091.091.091.091.091.091.091.090.090.090.076.076.076.076.076.0NANANA76.0NANANA
us-gaap:OperatingLeaseRightOfUseAsset ▆▆▇▇▇▇▇███▁797.6818.9866.4881.0912.9926.7957.4990.01016.51045.40.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAssetsNoncurrent ▇██▆▆▇▇▅▆▅▅▄▅▅▅▃▃▄▃▃▃▄▃▃▄▄▄▃▃▄▃▂▂▂▂▂▂▂▂▁▁▂▁3727.93962.03852.33109.63292.53414.53407.32794.82991.52655.42577.42394.62528.92611.62553.51856.92025.82171.12085.11894.22004.02174.82106.62069.02188.02278.02221.01944.02056.02162.02038.01414.01581.01651.01627.01397.01405.01499.01346.01135.01264.01347.01079.0NANANA946.0NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:AccountsPayableCurrent ▅▆▆▆▅▅█▆▆▅▇▅▅▄█▅▃▂▆▄▃▃▄▃▃▃▃▃▃▃▃▂▂▂▃▂▁▂▂▂▁▁▂1641.61703.91709.71659.61628.01593.42085.81766.81689.01497.21874.31579.91635.41449.62065.31537.01268.41116.91688.51340.31242.31219.51418.01274.01236.01283.01287.01259.01228.01213.01266.01044.0987.01004.01169.0988.0906.0978.01095.01003.0969.0884.01061.0NANANA1158.0NANANA
us-gaap:LiabilitiesCurrent ▇▆▆▅▆█▆▄▄▄▄▄▅▅▄▃▄▄▅▃▄▃▃▃▂▃▄▃▃▂▂▁▂▂▂▂▂▂▂▁▁▁▂10428.610220.19926.79047.210122.011654.710299.18611.28357.17990.68648.88426.29058.39471.48271.37322.08392.27914.59498.07779.47869.97221.97108.57058.06650.07128.07967.07457.07600.06519.06112.05692.06519.06175.06823.06795.06407.06342.06611.05684.05887.05989.06518.0NANANA5327.0NANANA
us-gaap:LongTermDebtCurrent ▆▅▅▄▅▅▃▂▂▃▃▄▆▇▄▆█▇█▆▅▅▄▄▄▆▇▆▇▃▃▂▄▃▅▆▅▅▂▂▁▂▂2458.52130.22086.11911.62137.72109.71598.71327.71257.41528.51698.51904.22281.42616.11753.72359.32755.02514.22878.02384.82006.32033.31831.81826.01817.02451.02503.02381.02524.01612.01549.01366.01819.01674.02171.02272.01983.01980.01433.01267.01071.01421.01309.0NANANA1741.0NANANA
us-gaap:OperatingLeaseLiabilityCurrent ██████████▁242.7240.6241.3236.5236.4234.3234.1228.8229.2228.20.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherLiabilitiesCurrent ▃▃▆▄▃▄█▄▄▂▆▅▃▃▄▃▃▃▇▄▄▄▇▆▄▃▆▅▃▂▃▁▁▁▃▄▂▂▃▃▃▂▃1009.7965.71199.31084.2982.91034.51373.81032.41038.5888.11190.51128.9938.8960.01033.2953.9985.81008.01302.81019.81038.61055.61305.11234.01059.01000.01250.01119.01010.0917.0965.0841.0823.0811.0968.01037.0870.0853.0990.01004.0942.0930.0952.0NANANA931.0NANANA
us-gaap:TaxesPayableCurrent ▆▇█▄▆▆▇▄▅▆▆▃▄▅▅▃▄▅▅▂▃▄▄▃▃▃▄▃▂▃▃▂▂▃▃▁▂▂▃▁▂▂▂1243.51397.91476.4942.71212.51255.41357.8883.41046.21156.51218.0774.1943.91081.41115.5716.5891.51078.51048.0666.2814.0899.5979.1748.0749.0846.0871.0769.0692.0803.0822.0590.0680.0727.0747.0512.0617.0679.0717.0501.0597.0669.0702.0NANANA632.0NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:LiabilitiesNoncurrent ██▇▇▆▆▆▆▆▅▄▄▄▃▄▄▃▃▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▁▂▁▁▁▁▁▁52234.851489.750010.848935.047271.845943.645571.445153.944643.943388.240985.840043.938966.437538.838132.338528.136491.936100.536549.636319.637042.337122.936669.736332.036846.035662.034842.033596.033435.034100.034216.033508.032923.032954.032307.031742.032006.031703.030947.030790.030866.030732.030255.0NANANA29820.0NANANA
us-gaap:LongTermDebt ██▇▇▆▆▅▅▅▄▄▄▃▃▃▃▂▂▃▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▂▁▁▁▁▁▁▁▁33117.832345.031072.530067.128775.427892.726725.525881.225431.824426.723346.722774.022032.021461.021173.320721.719551.919236.420256.419704.719543.719782.619572.719426.019578.019229.018684.018058.018125.018087.018377.017568.017618.017573.017757.017227.017302.017320.016516.016450.016635.017052.016811.0NANANA17498.0NANANA
us-gaap:LongTermDebtNoncurrent ██▇▇▆▆▆▅▅▅▄▄▃▃▃▃▂▂▂▂▂▂▂▂▂▂▂▁▁▂▂▂▁▁▁▁▁▁▁▁▁▁▁30659.330214.828986.428155.526637.725783.025126.824553.524174.422898.221648.220869.819750.618844.919419.618362.416796.916722.217378.417319.917537.417749.317740.917600.017761.016778.016181.015677.015601.016475.016828.016202.015799.015899.015586.014955.015319.015340.015083.015183.015564.015631.015502.0NANANA15757.0NANANA
us-gaap:DeferredTaxLiabilitiesNoncurrent ▃▃▃▂▂▂▂▂▂▁▁▁▁▁▁██▇▇▇█▇▇▇▇▆▆▅▅▅▅▅▄▄▄▄▃▃▃▃▂▂▂8382.18349.98240.98011.47811.27668.57588.27427.87294.07193.07086.57110.47085.36943.96813.912628.212288.511981.611884.411815.112402.512133.811733.211425.011426.011188.010986.010506.010463.010446.010300.09871.09691.09556.09252.08905.08627.08493.08227.08108.07716.07490.07359.0NANANA6420.0NANANA
us-gaap:DeferredIncomeTaxLiabilitiesNet NANA8240.9NANANA7588.2NANANA7086.5NANANA6813.9NANANA11884.4NANANA11733.2NANANA10852.4NANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DeferredIncomeTaxLiabilitiesNet dei:LegalEntity aep:AEPTexasInc.NANA1016.7NANANA965.4NANANA913.1NANANA913.1NANANA1531.7NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DeferredIncomeTaxLiabilitiesNet dei:LegalEntity aep:AEPTransmissionCoNANA906.9NANANA817.8NANANA704.4NANANA601.7NANANA862.1NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DeferredIncomeTaxLiabilitiesNet dei:LegalEntity aep:AppalachianPowerCoNANA1749.9NANANA1680.8NANANA1625.8NANANA1565.7NANANA2672.3NANANA2527.0NANANA2264.8NANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DeferredIncomeTaxLiabilitiesNet dei:LegalEntity aep:IndianaMichiganPowerCoNANA1064.4NANANA979.7NANANA948.0NANANA953.8NANANA1527.4NANANA1361.5NANANA1278.2NANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DeferredIncomeTaxLiabilitiesNet dei:LegalEntity aep:OhioPowerCoNANA955.1NANANA849.3NANANA763.3NANANA762.9NANANA1346.1NANANA1383.2NANANA1356.3NANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DeferredIncomeTaxLiabilitiesNet dei:LegalEntity aep:PublicServiceCoOfOklahomaNANA688.5NANANA628.3NANANA607.8NANANA642.0NANANA1058.8NANANA971.8NANANA906.0NANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DeferredIncomeTaxLiabilitiesNet dei:LegalEntity aep:SouthwesternElectricPowerCoNANA1017.6NANANA940.9NANANA902.8NANANA917.7NANANA1606.9NANANA1399.8NANANA1342.1NANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent dei:LegalEntity,us-gaap:RetirementPlanType aep:AppalachianPowerCo,us-gaap:OtherPostretirementBenefitPlansDefinedBenefitNANA22.5NANANA22.5NANANA27.3NANANA35.2NANANA31.5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent dei:LegalEntity,us-gaap:RetirementPlanType aep:AppalachianPowerCo,us-gaap:PensionPlansDefinedBenefitNANA0.5NANANA10.2NANANA9.8NANANA13.3NANANA47.6NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent dei:LegalEntity,us-gaap:RetirementPlanType aep:SouthwesternElectricPowerCo,us-gaap:PensionPlansDefinedBenefitNANA7.5NANANA17.2NANANA10.2NANANA2.7NANANA9.2NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap:RetirementPlanType us-gaap:OtherPostretirementBenefitPlansDefinedBenefitNANA33.7NANANA31.8NANANA49.7NANANA59.3NANANA53.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap:RetirementPlanType us-gaap:PensionPlansDefinedBenefitNANA74.7NANANA215.3NANANA108.7NANANA71.8NANANA252.6NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:MinorityInterest ▇▇▇█████▅▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁251.2247.2223.6268.7270.8279.3281.0281.3163.632.231.030.029.128.326.636.425.424.623.121.118.715.213.210.08.07.04.04.04.03.01.01.00.00.00.00.01.01.01.0NANANA0.0NANANANANANANA
us-gaap:OtherLiabilitiesNoncurrent ▁▂▁▃▁▁▁▂▂▃▂▃▄▃▃▃▃▁▂▁▂▄▄▄▇▇▇██▅▅▄▄▅▅▅▅▅▆▆▆▆▃724.9733.7728.0794.6715.4709.5719.8790.0763.1797.9782.6807.2871.6808.2830.9837.0813.3728.3774.6702.1771.1872.7890.6865.01088.01062.01071.01119.01097.0968.0967.0891.0889.0913.0940.0923.0934.0923.0974.0978.0997.0993.0795.0NANANA1163.0NANANA
us-gaap:OperatingLeaseLiabilityNoncurrent ▆▆▆▇▇▇▇█▇█▁568.4625.1638.4690.5688.5736.3734.6801.1797.2860.20.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:StockholdersEquity ██▇▇▇▇▆▆▆▆▆▆▆▅▅▅▅▅▄▄▅▅▅▅▄▄▄▄▄▄▃▃▃▃▂▃▂▂▂▂▁▁▁21378.720972.820550.920365.920007.419728.419632.219716.419259.619196.319028.419016.818722.318483.318287.018069.117824.117687.117397.017321.918386.218126.517891.717699.017434.017241.016820.016868.016581.016416.016085.015762.015537.015421.015237.015306.015007.014856.014664.014653.013939.013779.013622.0NANANA13140.0NANANA
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us-gaap:RetainedEarningsAccumulatedDeficit ███▇▇▇▇▇▆▆▆▆▆▅▅▅▅▅▄▄▅▅▅▅▄▄▄▄▄▃▃▃▃▃▃▃▃▂▂▂▁▁▁11098.710892.710687.810621.410221.910038.89900.910095.39694.29565.69325.39293.79023.18801.58626.78532.08276.48194.37892.47809.48851.48624.88398.38204.07945.07776.07406.07470.07222.07076.06766.06664.06470.06370.06236.06444.06185.06050.05890.05810.05103.04973.04842.0NANANA4451.0NANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax █▆▆▅▅▄▅▅▄▅▅▆▆▆▆▅▅▅▅▅▅▅▅▅▆▆▆▆▆▅▅▃▃▃▃▁▁▁▁▂▂▂▂97.0-30.8-85.1-135.4-172.9-216.5-147.7-187.9-230.7-150.7-120.4-86.0-94.8-95.4-67.8-175.4-161.6-171.0-156.3-145.8-117.9-133.8-127.1-109.0-102.0-103.0-103.0-105.0-104.0-109.0-115.0-306.0-313.0-306.0-337.0-454.0-475.0-472.0-470.0-380.0-362.0-373.0-381.0NANANA-374.0NANANA
us-gaap:MinorityInterest ▇▇▇█████▅▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁251.2247.2223.6268.7270.8279.3281.0281.3163.632.231.030.029.128.326.636.425.424.623.121.118.715.213.210.08.07.04.04.04.03.01.01.00.00.00.00.01.01.01.0NANANA0.0NANANANANANANA
us-gaap:StockIssuedDuringPeriodValueNewIssues ▁█72.3184.6NA25.554.956.1NA12.417.814.511.111.618.732.2NANANANA0.03.318.812.113.612.025.031.010.034.014.015.023.020.026.015.019.014.019.031.022.021.018.031.027.023.017.026.0NANANANA
 us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders dei:LegalEntity aep:SouthwesternElectricPowerCo▁█0.61.0NA0.41.20.7NA1.11.11.11.11.41.00.810.91.00.61.10.71.21.11.20.5010.9921.0451.0620.771.1741.0731.2360.6491.102NANANANANANANANANANANANANANANANANANA
 us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders dei:LegalEntity,us-gaap:StatementEquityComponents aep:SouthwesternElectricPowerCo,us-gaap:NoncontrollingInterest▁█0.61.0NA0.41.20.7NA1.11.11.11.11.41.00.810.91.00.61.10.71.21.11.20.5010.9921.0451.0620.771.1741.0731.2360.6491.102NANANANANANANANANANANANANANANANANANA
 us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders us-gaap:StatementEquityComponents us-gaap:NoncontrollingInterest█▁2.72.5NA2.03.24.6NA1.51.81.11.21.31.30.610.91.00.61.10.81.11.11.20.51.11.01.01.31.01.01.00.81.0NANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▅▁▅▅▅▄▅▇▅▄▆█▆▄▅▆▅▄1161.1-117.2910.71176.01130.5615.7920.21549.1992.5808.31290.61925.81204.6802.21146.21407.2910.2806.8NANANA799.9NANANA1257.0NANANA1133.01066.01524.0760.0756.0892.01199.0837.0876.0450.01606.0902.0830.0960.01120.0580.02.0NANANANA
us-gaap:NetCashProvidedByUsedInInvestingActivities ▂▂▂▂▂▂▂▂▁▂▂▂▃▁▁▃▃█-1595.6-1634.2-1526.6-1459.7-1481.6-1766.0-1786.9-1762.6-2012.2-1582.8-1664.9-1449.8-1311.1-1927.8-1933.7-1325.9-1241.6844.8NANANA-1138.3NANANA-1017.0NANANA-981.0-1298.0-877.0-871.0-772.0-1110.0-751.0-738.0-792.0-923.0-687.0-667.0-613.0-948.0-583.0-562.0-430.0NANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity aep:AEPTexasInc.▅▅▆▃▅▇▂▅▅▅▅▅▅▄█▁▆▆-279.3-277.8-172.20000000000013-448.3-324.9-120.0-536.4-272.1-327.1-336.6-328.6-272.3-324.4-364.4-32.3-671.7-176.0-195.3NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity aep:AEPTransmissionCo▆▅▄▆▆▂▇▂▇▅█▂▆▃▆▁▅▆▄▇-329.3-398.3-456.4-324.5-327.1-532.4-269.4-520.2-269.8-343.8-197.8-540.8-316.3-458.4-318.2-600.6-342.7-334.1-414.3-281.2NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity aep:AppalachianPowerCo█▁▇▄▄▄▄▄█▂▅▅▅▄▄▅▅▄▅▆▅▅▅▅▇▄-13.4-420.6-58.5-242.9-238.8-217.7-253.4-207.97.4-383.5-204.0-166.5-184.8-214.1-262.1-179.2-146.9-214.1-179.0-142.1-155.1-156.7-186.5-151.6-29.754-231.546NANANA-274.532-178.936-78.143-83.677-110.91-146.114-106.379-94.904-115.462-99.987-326.434146.542-492.622-160.702-111.075NANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity aep:IndianaMichiganPowerCo▁▃▆▄▄▅▅▂▅▃█▆▁▃▁▂▃▄▂▃▅▃▄▆▇▄-223.3-189.8-146.7-172.1-177.9-152.2-162.2-211.9-154.4-191.6-105.2-139.0-225.3-185.3-222.1-200.7-189.1-179.0-208.6-197.3-161.1-193.1-171.1-131.8-115.602-175.698NANANA-178.47767.918-184.178-85.609-346.561-44.354-136.257-151.415-141.783-39.051-235.577-96.81-139.83374.506-180.392NANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity aep:OhioPowerCo▄▄▃▄▄▃▃▅▃▃▄▃▇▁▃▄▄▅▄▅█▇▄▄▇▅-170.6-176.1-200.5-184.1-179.5-226.9-193.5-108.7-247.1-194.8-184.5-222.966.8-366.9-211.1-124.3-124.5-71.0-171.9-69.5120.024.6-167.7-185.165.071-84.071NANANA227.344-254.828-160.273-163.077-15.75-135.476-217.123-31.156-16.534-200.093-138.759-54.833-51.696-131.42-174.239NANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity aep:PublicServiceCoOfOklahoma▁▆▆▆▅▇█▂▇▆▆▇▇▇▇▆▇▆█▅▄█▇▄▅▃-187.99999999999997-79.4-81.4-69.7-87.9-56.1-36.4-160.1-61.3-70.3-74.1-57.4-49.1-52.4-59.9-66.7-60.1-74.8-30.9-86.8-112.0-29.8-58.9-130.8-89.489-151.311NANANA-92.724-80.121-77.613-54.672-38.54424.825-35.59-130.823-51.66622.295-136.679-29.091-35.602-42.225-43.647NANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity aep:SouthwesternElectricPowerCo▄▅▅▅▅▅▅▅▅▆█▁▅▄▅▅▅▆▆▃▅▅▅▆▅▃-264.9-91.3-77.9-90.5-102.6-121.6-126.6-97.6-97.7-8.3323.1-608.0-98.9-145.1-126.2-100.8-81.487.820.6-391.7-99.3-123.6-87.8-0.9-13.151-391.849NANANA-104.119-109.919-101.596-76.29228.05-171.835-176.91-186.815-159.091-158.434-118.201-155.238-39.011-104.117-77.493NANANANANANA
us-gaap:NetCashProvidedByUsedInFinancingActivities ▅▇▅▄▂█▅▄▆▅▄▄▄▆▅▄▄▁470.20000000000021637.1590.4242.8-815.02388.5809.5313.71046.2693.5-119.174.2177.31029.5709.365.2307.7-1687.1NANANA352.4NANANA-213.0NANANA22.0203.0-617.049.0-84.054.0-302.0-88.0-19.0148.0-790.0-443.0114.0-808.0-285.02.0756.0NANANANA
 us-gaap:CashAndCashEquivalentsPeriodIncreaseDecrease dei:LegalEntity aep:PublicServiceCoOfOklahomaNA-0.2-0.41.60.3-0.4-1.41.5-0.1-0.50.10.31.0-1.0-0.50.70.1-0.2-0.5-1.30.11.8-0.3110.39-0.1510.072-0.4760.201-0.1290.479-0.7230.9580.568-0.8930.345-0.2110.445-0.625-0.861.30.2190.284-1.1170.498NANANANANANA
 us-gaap:CashAndCashEquivalentsPeriodIncreaseDecrease dei:LegalEntity aep:SouthwesternElectricPowerCo▆▅▂█▄▄▁▄▄▄█▄▄▄▄▄▃▄▃▄▄▅▃▅▄▃▃▅▄▄▄▅▅▅▂▅▄▇▃▅▄▅▄▄9.85.0-12.423.80.4-0.2-19.8-2.61.9-2.422.00.41.4-0.9-0.60.5-8.60.0-4.91.21.77.1-9.1026.2410.042-6.381-9.637.015-1.0240.754-0.415.8114.6975.107-14.592.009-3.41517.231-4.9833.695-1.9852.56-0.3680.32NANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
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us-gaap:IncreaseDecreaseInAccountsPayable ▄█▄▇▆▃▆▆▆▃▇▅▆▃▆▆▆▁▇▆▅▅▆▅▄▆▅▅▄▆▇▆▄▅▆▅▄▅▆▆▆▃▇▅▄▄-74.3171.8-57.286.646.4-111.138.240.080.2-152.681.68.675.7-129.333.079.580.2-250.7117.170.411.8-34.429.5-3.0-59.049.0-37.0-4.0-72.033.0123.029.0-54.0-3.075.0-35.0-74.0-26.022.021.039.0-126.0127.05.0-85.0-83.0NANANANA
 us-gaap:IncreaseDecreaseInAccountsPayable dei:LegalEntity aep:AEPTexasInc.▃▄▄▄▅▄▃▄▃▄▃▄▃▂▁█▄▃-11.71.46.02.119.72.4-10.316.0-2.44.2-1.210.5-3.7-25.9-46.581.88.9-13.4NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IncreaseDecreaseInAccountsPayable dei:LegalEntity aep:AEPTransmissionCo▅▁█▄▂▅▆▃▂▄▂▂▅▂▃▄▃▂▄▄19.0-18.951.815.5-12.222.733.5-2.2-5.111.4-10.8-10.426.0-12.31.211.35.5-8.216.06.7NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IncreaseDecreaseInAccountsPayable dei:LegalEntity aep:AppalachianPowerCo▂▆▅▄▅▁▄▅▅▄▅▄▅▃▅▄▅▄▅▅▄▄▄▅▄▄▄▄▃▄▆▄▃▄▆▅▄▃▅▄▅▂█▄-49.946.025.9-4.417.0-86.6-2.417.131.3-8.38.2-10.410.5-21.631.3-12.531.4-12.714.618.4-10.6-2.9-2.37823.268-18.391-2.1992.594-18.546-42.498-4.31444.714-19.631-36.437-20.59739.9916.095-18.751-24.78711.839-9.8878.261-71.05697.089-13.741NANANANANANA
 us-gaap:IncreaseDecreaseInAccountsPayable dei:LegalEntity aep:IndianaMichiganPowerCo▅▃▄▅▄▃▅▆▂▄▅▃▃▄▄▄▅▃▅▄▃▄▅▃▄▄▄▅▄▃▅▅▃▃█▂▃▄▄▅▄▁▇▅31.2-14.8-9.932.8-12.1-21.610.943.1-47.3-3.120.6-22.5-13.51.31.07.631.5-22.529.58.9-16.9-9.917.701-20.7656.945-0.181-8.37414.807-5.957-20.90224.36612.531-16.247-31.80191.758-42.226-29.304-4.269-1.9126.175-5.234-71.20657.50720.151NANANANANANA
 us-gaap:IncreaseDecreaseInAccountsPayable dei:LegalEntity aep:OhioPowerCo▄▄▅▄▂▅▅▅▄▃▅▄▄▃▆▃▅▃▅▄▅▃▅▄▃▃▆▄▃▃▆▄▃▃▇▄▃▁▅▄▅▂█▃-7.2-6.430.23.2-58.635.512.722.6-11.0-23.918.08.1-17.4-22.542.8-24.428.1-34.911.76.825.6-30.414.531-10.726-42.937-25.16852.691-12.801-39.317-30.91164.568-0.54-24.198-42.74971.969-0.596-36.321-98.50234.9-0.78425.659-76.834118.295-21.61NANANANANANA
 us-gaap:IncreaseDecreaseInAccountsPayable dei:LegalEntity aep:PublicServiceCoOfOklahoma▄▅▄▂▇▁▅▁█▂▅▃▇▃▅▂▇▂▄▄▇▃▅▃▅▃▄▂▅▃▆▃▆▄▅▃▅▃▂▂▆▄▂▂-3.515.2-3.4-24.637.6-39.112.8-34.351.8-23.310.8-16.133.9-10.97.8-27.536.7-27.72.6-3.944.6-17.615.739-14.82112.287-6.8052.307-29.60217.85-16.89128.465-12.79827.408-5.82714.79-8.3697.392-10.655-23.574-26.32425.7274.103-27.022-31.396NANANANANANA
 us-gaap:IncreaseDecreaseInAccountsPayable dei:LegalEntity aep:SouthwesternElectricPowerCo▁█▂█▆▃▄▄▇▃▆▄▅▄▆▃▆▃▅▄▅▄▅▄▅▄▅▄▅▄▅▄▅▄▅▄▅▄▅▃▆▄▅▄-100.395.1-76.985.134.1-31.2-15.6-18.360.5-55.030.8-12.67.3-24.636.2-38.946.7-33.520.7-16.218.9-19.96.42-13.94625.126-28.319.405-23.23217.596-9.4120.442-8.90313.935-12.65817.287-16.41210.337-7.399-1.738-34.91749.252-11.42912.886-25.385NANANANANANA
us-gaap:IncreaseDecreaseInInventories ▃▄▅▄▆▅▆▄▆▅▆▃▄▄▅▃▅▄▄▂▄▆█▄▄▂▆▄▄▁▄▂▅▄▅▄▅▆▆▂▄▂▅▂▅▃-92.80000000000001-39.545.5-22.984.535.8131.62.088.226.478.0-67.5-2.7-28.540.6-68.022.9-13.4-48.6-118.611.695.4232.6-45.0-16.0-133.0120.0-15.02.0-209.0-50.0-133.060.01.055.0-30.073.0126.099.0-129.0-25.0-121.019.0-169.012.0-83.0NANANANA
 us-gaap:IncreaseDecreaseInInventories dei:LegalEntity aep:AEPTexasInc.▃▃▂▂▆█▄▄▃▄▆▅▃▄▂▆▁▃-0.2-0.3-2.0-2.03.87.60.90.9-1.81.03.62.9-0.70.2-3.34.9-4.4-0.4NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IncreaseDecreaseInInventories dei:LegalEntity aep:AEPTransmissionCo▅▅▁▅▄▄▄▃▃▅▆▅▅▆▃█▆▇▇▆0.20.3-5.10.20.0-0.4-1.3-2.1-2.40.62.60.40.51.9-2.45.12.13.83.51.5NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IncreaseDecreaseInInventories dei:LegalEntity aep:AppalachianPowerCo▄▄█▅▅▆█▅▇▆▇▄▅▄▅▅▅▆▅▄▆▇▇▅▇▃▆▅▆▁▄▃▇▆▅▅▆██▃▄▂▆▂-20.2-25.250.6-14.6-3.35.544.2-1.040.69.625.2-32.8-0.9-19.3-8.3-13.7-7.26.9-14.1-30.53.428.342.252-15.86324.134-39.6232.994-9.85718.937-88.057-22.948-41.17227.3528.726-3.739-10.9479.81745.13752.388-47.13-23.603-61.84616.271-63.332NANANANANANA
 us-gaap:IncreaseDecreaseInInventories dei:LegalEntity aep:IndianaMichiganPowerCo▂▃▇▃▆▇▇▄▆▃▆▄▄▅▅▃▅▅▁▂▅▆▇▄▁▃▅▃▅▃▄▃▆▅█▂▃▆▄▂▂▃▅▂-18.3-8.819.3-11.510.716.217.80.810.4-6.610.1-3.90.54.53.4-11.16.78.5-22.0-18.23.316.017.9091.475-22.326-8.7587.071-10.2162.672-7.34-1.011-7.60110.5926.86826.636-15.79-5.41513.890.237-14.373-17.76-8.3434.543-14.811NANANANANANA
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 us-gaap:IncreaseDecreaseInInventories dei:LegalEntity aep:PublicServiceCoOfOklahoma▂▁▂▃█▇▄▅▅▂▄▄▃▄▄▁▁▂▁▂▅▅▄▄▃▄▆▂▂▃▂▁▅▃▄▆▃▃▆▂▅▄▅▁-4.0-4.5-3.1-0.99.68.50.02.32.8-3.21.10.7-0.91.70.5-5.3-4.8-3.4-4.4-3.22.13.51.1330.604-1.51.9635.173-2.425-3.181-0.149-2.494-4.9752.443-1.3440.7474.801-1.37-1.1115.246-4.2123.0790.6652.807-5.47NANANANANANA
 us-gaap:IncreaseDecreaseInInventories dei:LegalEntity aep:SouthwesternElectricPowerCo▁▃▁▄█▄▆▃▄▅▄▃▄▃▆▃▄▂▃▂▃▂█▂▂▄▅▄▂▃▄▂▄▃▅▄▅▃▄▄▅▃▄▃-28.7-0.4-24.510.552.87.628.4-1.63.116.21.5-3.81.0-2.229.6-10.59.4-12.5-4.7-16.6-3.1-13.747.661-12.608-12.6110.45816.2330.414-17.812-5.1022.08-15.099.755-3.30318.19511.0116.7180.1834.661.57913.417-4.4886.313-7.715NANANANANANA
us-gaap:NetCashProvidedByUsedInOperatingActivities ▅▁▅▅▅▄▅▇▅▄▆█▆▄▅▆▅▄1161.1-117.2910.71176.01130.5615.7920.21549.1992.5808.31290.61925.81204.6802.21146.21407.2910.2806.8NANANA799.9NANANA1257.0NANANA1133.01066.01524.0760.0756.0892.01199.0837.0876.0450.01606.0902.0830.0960.01120.0580.02.0NANANANA
us-gaap:ProfitLoss ▇▇▆▇▆▆▅▇▆▇▆▇▆▆▆▆▆▇▆▁▆▆▆▆▆▇▅▆▆▆▆▆▆▆▄▆▆▆▅█▆▆▅▆▅▆▅▆▅▆573.8578.8434.7748.2514.5499.3152.7733.9459.1574.1364.8579.7530.1456.7401.8556.7376.2594.2375.2-764.2503.9503.1470.7520.0431.0631.0192.0494.0391.0561.0347.0434.0339.0364.021.0488.0363.0390.0311.0930.0353.0355.0178.0557.0137.0346.0239.0446.0317.0363.0
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▂▂▂▂▂▂▂▂▁▂▂▂▃▁▁▃▃█-1595.6-1634.2-1526.6-1459.7-1481.6-1766.0-1786.9-1762.6-2012.2-1582.8-1664.9-1449.8-1311.1-1927.8-1933.7-1325.9-1241.6844.8NANANA-1138.3NANANA-1017.0NANANA-981.0-1298.0-877.0-871.0-772.0-1110.0-751.0-738.0-792.0-923.0-687.0-667.0-613.0-948.0-583.0-562.0-430.0NANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity aep:AEPTexasInc.▅▅▆▃▅▇▂▅▅▅▅▅▅▄█▁▆▆-279.3-277.8-172.20000000000013-448.3-324.9-120.0-536.4-272.1-327.1-336.6-328.6-272.3-324.4-364.4-32.3-671.7-176.0-195.3NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity aep:AEPTransmissionCo▆▅▄▆▆▂▇▂▇▅█▂▆▃▆▁▅▆▄▇-329.3-398.3-456.4-324.5-327.1-532.4-269.4-520.2-269.8-343.8-197.8-540.8-316.3-458.4-318.2-600.6-342.7-334.1-414.3-281.2NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity aep:AppalachianPowerCo█▁▇▄▄▄▄▄█▂▅▅▅▄▄▅▅▄▅▆▅▅▅▅▇▄-13.4-420.6-58.5-242.9-238.8-217.7-253.4-207.97.4-383.5-204.0-166.5-184.8-214.1-262.1-179.2-146.9-214.1-179.0-142.1-155.1-156.7-186.5-151.6-29.754-231.546NANANA-274.532-178.936-78.143-83.677-110.91-146.114-106.379-94.904-115.462-99.987-326.434146.542-492.622-160.702-111.075NANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity aep:IndianaMichiganPowerCo▁▃▆▄▄▅▅▂▅▃█▆▁▃▁▂▃▄▂▃▅▃▄▆▇▄-223.3-189.8-146.7-172.1-177.9-152.2-162.2-211.9-154.4-191.6-105.2-139.0-225.3-185.3-222.1-200.7-189.1-179.0-208.6-197.3-161.1-193.1-171.1-131.8-115.602-175.698NANANA-178.47767.918-184.178-85.609-346.561-44.354-136.257-151.415-141.783-39.051-235.577-96.81-139.83374.506-180.392NANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity aep:OhioPowerCo▄▄▃▄▄▃▃▅▃▃▄▃▇▁▃▄▄▅▄▅█▇▄▄▇▅-170.6-176.1-200.5-184.1-179.5-226.9-193.5-108.7-247.1-194.8-184.5-222.966.8-366.9-211.1-124.3-124.5-71.0-171.9-69.5120.024.6-167.7-185.165.071-84.071NANANA227.344-254.828-160.273-163.077-15.75-135.476-217.123-31.156-16.534-200.093-138.759-54.833-51.696-131.42-174.239NANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity aep:PublicServiceCoOfOklahoma▁▆▆▆▅▇█▂▇▆▆▇▇▇▇▆▇▆█▅▄█▇▄▅▃-187.99999999999997-79.4-81.4-69.7-87.9-56.1-36.4-160.1-61.3-70.3-74.1-57.4-49.1-52.4-59.9-66.7-60.1-74.8-30.9-86.8-112.0-29.8-58.9-130.8-89.489-151.311NANANA-92.724-80.121-77.613-54.672-38.54424.825-35.59-130.823-51.66622.295-136.679-29.091-35.602-42.225-43.647NANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity aep:SouthwesternElectricPowerCo▄▅▅▅▅▅▅▅▅▆█▁▅▄▅▅▅▆▆▃▅▅▅▆▅▃-264.9-91.3-77.9-90.5-102.6-121.6-126.6-97.6-97.7-8.3323.1-608.0-98.9-145.1-126.2-100.8-81.487.820.6-391.7-99.3-123.6-87.8-0.9-13.151-391.849NANANA-104.119-109.919-101.596-76.29228.05-171.835-176.91-186.815-159.091-158.434-118.201-155.238-39.011-104.117-77.493NANANANANANA
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment NA102.9NANANANA-2.9340.1NANA14.60.0NANANANANANANANANANA4.3-1.00.02.020.00.02.043.026.02.02.02.05.01.03.085.09.00.08.02.0139.04.0NANANANANANA
 us-gaap:PaymentsToAcquirePropertyPlantAndEquipment dei:LegalEntity aep:AEPTransmissionCoNANA2.41.20.71.71.85.00.12.524.20.111.31.85.33.8-0.60.6NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PaymentsToAcquireInvestments ▆▃▃▃▃▅▄▅▁▁▃▄▄▄▃▄▆▄▄▅▅█▆▇▂▂▂▂▃▁▂▂▂▂▂▂▂▃▂▃▂▃▃▅▃▃825.2337.6349.3341.1355.7632.7624.5716.0105.1130.4476.6522.0543.3525.9458.9537.6812.2506.0547.8657.1645.41152.0793.7948.0295.0246.0297.0281.0345.0165.0234.0270.0227.0196.0302.0199.0193.0353.0297.0379.0191.0454.0376.0704.0393.0445.0NANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▅▇▅▄▂█▅▄▆▅▄▄▄▆▅▄▄▁470.20000000000021637.1590.4242.8-815.02388.5809.5313.71046.2693.5-119.174.2177.31029.5709.365.2307.7-1687.1NANANA352.4NANANA-213.0NANANA22.0203.0-617.049.0-84.054.0-302.0-88.0-19.0148.0-790.0-443.0114.0-808.0-285.02.0756.0NANANANA
us-gaap:ProceedsFromIssuanceOfLongTermDebt ▅█▇▇▅▆▅▃▆▆▆▆▆▄▅▇▄▁▅▄▂▃▃▂█▄▄▂▄▁▅▅▂▃▅▂▁▅▂▁▁▅▁▁▃▃1103.61951.51640.31554.51012.41418.91044.2718.71488.11285.61373.71362.81368.2841.01111.41692.7967.182.91035.3816.2218.3525.1505.6328.01829.0774.0861.0267.0863.076.01120.01146.0270.0671.01256.0339.0129.01132.0210.044.060.01014.069.040.0509.0652.0NANANANA
us-gaap:RepaymentsOfLongTermDebt ▂▄▄▂▁▂▁▂▃▂▅▄▄▃▄▃▄▇▃▃▃▂▂▂█▂▂▂▅▂▂▇▂▅▄▃▁▂▁▂▃▄▃▁▄▄347.4650.7639.3267.3132.7300.5197.3295.2507.7220.6822.5619.7795.8544.0660.7527.9657.01242.3487.3523.5461.7322.4266.9404.01488.0239.0242.0333.0835.0370.0317.01208.0215.0858.0739.0417.0148.0339.0145.0257.0486.0777.0539.0113.0703.0638.0NANANANA
us-gaap:PaymentsOfDividendsCommonStock ███▇▇█▇▆▆▆▆▅▅▅▆▅▅▅▅▄▄▄▄▄▄▃▄▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▁▁▁374.5372.0369.2351.1340.9363.7348.0333.9334.5333.6333.0308.3308.1306.1325.0290.1293.5291.4291.2276.7276.6276.5276.0261.0262.0260.0262.0246.0245.0245.0245.0240.0239.0230.0229.0229.0229.0229.0230.0222.0223.0223.0222.0203.0202.0197.0NANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value33823376335933573355335033433341334033383337333633353332332933283328332833283328332833253324332233213317331333123308330533033299329632913289328632843280327432713266326332573239
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.04.14.24.34.34.34.44.54.64.74.94.95.05.15.15.25.35.45.25.45.35.35.45.45.45.55.65.75.75.85.96.06.06.06.06.16.16.26.36.46.46.56.56.7

us-gaap:CommonStockValue dei:LegalEntity

aep:AppalachianPowerCo


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value260260260260260260260260260260260260260260260260260260260260260260260260260260260260260260260260260260260260260260260260260260
Percentage of CommonStockValue7.77.77.87.87.87.87.87.87.87.87.87.87.87.87.87.87.87.87.87.87.87.87.87.87.87.97.97.97.97.97.97.97.97.97.97.97.97.98.08.08.08.0
Percentage of Assets0.30.30.30.30.30.30.30.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.50.50.50.50.50.50.50.50.50.50.50.50.50.5
Percentage of Assets aep:AppalachianPowerCo1.91.92.02.02.02.02.02.12.12.12.12.22.12.22.22.12.22.22.22.22.22.22.22.32.32.32.32.32.32.32.32.52.52.52.52.52.52.52.52.62.62.6

aep:IndianaMichiganPowerCo


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value565656565656565656565656565656565656565656565656565656565656565656565656565656565656
Percentage of CommonStockValue1.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.7
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of Assets aep:IndianaMichiganPowerCo0.50.50.50.50.50.50.50.50.50.50.60.60.60.60.60.60.60.60.60.60.60.60.60.70.70.70.70.70.70.70.70.70.70.70.70.70.70.80.80.80.80.8

aep:OhioPowerCo


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value321321321321321321321321321321321321321321321321321321321321321321321321321321321321321321321321321321321321321321321321321321
Percentage of CommonStockValue9.59.59.69.69.69.69.69.69.69.69.69.69.69.69.69.79.79.79.79.79.79.79.79.79.79.79.79.79.79.79.79.79.79.89.89.89.89.89.89.89.89.9
Percentage of Assets0.40.40.40.40.40.40.40.40.40.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.60.60.60.60.60.60.60.60.60.60.60.60.60.60.6
Percentage of Assets aep:OhioPowerCo3.63.73.73.93.93.94.04.24.24.34.34.54.54.44.44.64.54.64.54.84.84.64.54.64.64.54.44.84.84.74.52.62.52.52.52.52.52.52.53.83.83.7

aep:PublicServiceCoOfOklahoma


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value157157157157157157157157157157157157157157157157157157157157157157157157157157157157157157157157157157157157157157157157157157
Percentage of CommonStockValue4.64.74.74.74.74.74.74.74.74.74.74.74.74.74.74.74.74.74.74.74.74.74.74.74.74.74.74.74.84.84.84.84.84.84.84.84.84.84.84.84.84.8
Percentage of Assets0.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.30.30.20.30.20.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.3
Percentage of Assets aep:PublicServiceCoOfOklahoma2.62.73.13.23.23.33.33.33.43.43.53.53.53.53.53.53.53.53.63.73.73.73.83.83.94.04.14.24.24.34.54.64.64.74.74.64.64.74.84.74.84.8

aep:SouthwesternElectricPowerCo


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value0.10.10.10.1135135135135135135135135135135135135135135135135135135135135135135135135135135135135135135135135135135135135135135
Percentage of CommonStockValue0.00.00.00.04.04.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.24.2
Percentage of Assets0.00.00.00.00.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.30.30.30.30.30.30.3
Percentage of Assets aep:SouthwesternElectricPowerCo0.00.00.00.01.71.71.71.71.81.81.81.71.81.81.81.81.81.81.81.81.81.91.91.91.91.92.02.02.02.02.12.22.12.22.12.22.22.32.42.52.52.6

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesIssued


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value520519516516516515514514513513513513513512512512512512512512511511511511510510509509508508508507507506506505505504503503502502501498426421
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonStockSharesIssued us-gaap:StatementEquityComponents

us-gaap:CommonStock


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value520519516516516515514514514513513513513512512512512512512512512511511511511510510510509508508508507506506506505505504503502502501500500499498
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.099.9100.1100.1100.099.9100.0100.1100.099.9100.0100.1100.0100.1100.0100.099.9100.0100.00.00.00.099.9

Common Stock Shares Authorized

us-gaap:CommonStockSharesAuthorized dei:LegalEntity

us-gaap:CommonStockSharesAuthorized

aep:SouthwesternElectricPowerCo


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value0.003680.003680.003680.003687.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.67.6
Percentage of CommonStockSharesAuthorized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding dei:LegalEntity

us-gaap:CommonStockSharesOutstanding

aep:SouthwesternElectricPowerCo


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value0.003680.003680.003680.003687.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.536647.53664
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value500498497497496495495494493493493493492492491491491490490489488488488487486486485484484482482481479479478
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value499497496495494493493493493492492491491491491491491490490489488488487486486485484484483482481481479479478
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount


Antidilutive
Period End2021-03-312020-03-312019-03-312018-03-312017-03-312016-03-312015-03-312014-03-312013-03-312012-03-312011-03-31
Value0697000.000000000136250.0
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount0.0100.00.00.00.00.00.00.00.00.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value1.161.160.881.511.051.00.311.490.931.160.731.171.070.920.821.110.761.20.76-1.561.021.020.951.060.881.290.391.010.81.150.710.890.690.750.051.00.750.80.631.920.730.730.371.160.280.720.490.930.670.89
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value1.151.150.871.51.051.00.311.480.931.160.741.171.070.920.811.10.761.20.76-1.561.021.020.951.060.881.290.391.010.81.150.710.890.690.750.051.00.750.80.631.920.730.730.371.160.280.720.490.930.670.89
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value706629485786564426193776381542329586529455508530384577362-793.7518494450512431624193492395566532440331394138508359387221911363362
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax18.514.70.019.316.211.45.418.010.713.48.713.513.011.313.312.910.714.79.6-17.113.312.212.511.610.913.34.811.49.812.214.110.59.210.33.812.210.110.76.421.010.19.7

us-gaap:ComprehensiveIncomeNetOfTax dei:LegalEntity

aep:SouthwesternElectricPowerCo


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value366222875815181106.3276.590371115732416148343234.266815846137332221117.387291030895433-9.326755129
Percentage of ComprehensiveIncomeNetOfTax5.29.94.611.210.43.59.314.21.75.12.015.57.12.63.113.86.42.94.1-10.58.44.80.915.913.67.47.015.08.13.920.91.78.92.822.217.515.28.7-4.28.314.18.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.01.50.02.21.70.40.52.60.20.70.22.10.90.30.41.80.70.40.41.81.10.60.11.81.51.00.31.70.80.52.90.20.80.30.82.11.50.9-0.31.81.40.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo0.00.00.00.00.00.00.00.00.06.50.016.98.32.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value-4.43.8-0.8-0.4-6.34.1-0.80.4-2.21.31.42.11.72.31.1121.22.01.81.61.81.91.21.01.02.01.01.01.01.01.01.01.01.00.01.01.01.00.01.01.01.0
Percentage of ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.10.10.0-0.0-0.20.1-0.00.0-0.10.00.00.00.00.10.00.30.00.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest dei:LegalEntity

aep:SouthwesternElectricPowerCo


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value0.61.00.80.70.41.00.50.81.11.20.91.41.11.60.2110.61.00.81.11.11.10.6981.0130.9561.0330.8531.1091.1261.1020.8041.0581.0561.090.5230.9551.0611.0830.71.0231.0361.082
Percentage of ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest-13.626.3-100.0-175.0-6.324.4-62.5200.0-50.092.364.366.764.769.618.291.750.050.044.468.861.157.958.2101.395.651.685.3110.9112.6110.280.4105.8105.6109.00.095.5106.1108.30.0102.3103.6108.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo0.00.00.00.00.00.00.00.00.00.30.00.30.20.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value701633485785558430192776379543330588530458509542385579364-792.1519496451513432626194493396567533441332395138509360388221912364363161565129356
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax18.314.80.019.316.011.55.318.010.613.48.713.613.111.313.413.210.814.79.6-17.013.412.312.511.611.013.34.811.59.812.214.110.69.310.33.812.210.110.76.421.010.19.74.713.93.810.0

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest dei:LegalEntity

aep:AEPTexasInc.


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value804646826747-12.377803459584647165644933
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest11.47.39.710.612.011.1-6.410.021.36.418.09.98.810.332.411.912.85.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.11.10.02.01.91.3-0.31.82.30.91.61.31.21.24.31.61.40.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTexasInc.0.00.00.00.00.00.00.00.00.09.90.014.312.613.30.00.00.00.0

aep:AppalachianPowerCo


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value651306511679110251035413274867612493855111061103721255873581413148361016063307280656375255333403850
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest9.320.613.614.814.225.613.213.314.424.422.514.614.427.218.415.813.419.016.8-13.114.025.313.014.413.622.616.09.99.117.911.414.39.118.358.612.917.719.511.65.89.111.124.08.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.73.00.02.92.32.90.72.41.53.32.02.01.93.12.52.11.42.81.62.21.93.11.61.71.53.00.81.10.92.21.61.50.81.92.21.61.82.10.71.20.91.11.11.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AppalachianPowerCo0.00.00.00.00.00.00.00.00.016.90.011.311.215.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:IndianaMichiganPowerCo


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value5771557764922289609929739564466510683875517521565072142727874458414614392241164732464.43262
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest8.211.311.49.811.521.511.711.516.018.38.912.417.914.19.012.02.811.910.4-9.69.915.14.811.111.811.77.45.57.015.48.413.212.411.810.27.76.310.87.75.28.812.72.811.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.51.70.01.91.82.50.62.11.72.40.81.72.31.61.21.60.31.71.01.61.31.90.61.31.31.50.40.60.71.91.21.41.21.20.40.90.61.20.51.10.91.20.11.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:IndianaMichiganPowerCo0.00.00.00.00.00.00.00.00.016.00.011.815.811.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:OhioPowerCo


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value746856598075496850127888868799282628637997469477147654453566014818123134-38.158156104152219130145168296101
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest10.510.811.67.514.517.425.68.913.223.526.715.012.917.318.215.216.114.810.2-12.614.314.110.613.911.010.423.010.914.210.627.941.17.234.0-27.730.829.139.399.214.339.946.5184.118.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.91.60.01.52.32.01.41.61.43.12.32.01.72.02.42.01.72.21.02.11.91.71.31.61.21.41.11.21.41.33.94.30.73.5-1.13.83.04.26.43.04.04.58.62.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:OhioPowerCo0.00.00.00.00.00.00.00.00.015.40.011.99.010.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:PublicServiceCoOfOklahoma


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value46-2.86.48046-10.5-11.1100416.0-6.96036-7.40.446204.62.45228156.7474426131044228.2024.4455028137.976583412205631146.63955
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest6.6-0.41.310.28.3-2.4-5.812.911.01.1-2.110.26.8-1.60.18.55.20.80.7-6.65.53.11.58.76.22.25.59.15.61.40.811.58.53.45.811.49.73.29.16.28.64.14.19.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.2-0.10.02.01.3-0.3-0.32.31.20.1-0.21.40.9-0.20.01.10.60.10.11.10.70.40.21.00.70.30.31.00.60.20.11.20.80.40.21.41.00.30.61.30.90.40.21.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:PublicServiceCoOfOklahoma0.00.00.00.00.00.00.00.00.01.80.012.69.2-2.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:SouthwesternElectricPowerCo


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value376323885916181117.4297.492381315842517158444244.964825947147433231128.445301231905534-8.6267752306.54782
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest5.310.04.711.310.63.79.614.32.05.42.215.67.32.93.115.56.53.04.3-10.78.65.01.116.013.87.57.415.28.44.121.01.99.23.122.617.715.49.0-3.98.414.38.44.114.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.01.50.02.21.70.40.52.60.20.70.22.11.00.30.42.10.70.40.41.81.10.60.11.91.51.00.41.70.80.53.00.20.90.30.92.21.61.0-0.31.81.40.80.22.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo0.00.00.00.00.00.00.00.00.06.80.017.28.53.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Cost Of Goods And Services Sold

us-gaap:CostOfGoodsAndServicesSold dei:LegalEntity, us-gaap:ProductOrService

us-gaap:CostOfGoodsAndServicesSold

aep:AEPTexasInc., us-gaap:ElectricityGeneration


Cost
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value0.1103.20.02.0118.59.410135.88.93.78.3
Percentage of CostOfGoodsAndServicesSold100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.30.10.00.10.30.20.20.30.30.10.20.10.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTexasInc. us-gaap:ElectricityGeneration0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:AppalachianPowerCo, us-gaap:ElectricityGeneration


Cost
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value13716382166153111851771611831012631556999178
Percentage of CostOfGoodsAndServicesSold0.00.082400.01596.24809.40.04285.01583.01896.51950.0954.71995.52677.6775.32675.72151.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.63.80.04.14.43.02.44.14.54.52.76.13.81.72.64.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AppalachianPowerCo us-gaap:ElectricityGeneration0.00.00.00.00.0205.20.0251.8259.2271.60.0353.6273.40.00.00.0

aep:AppalachianPowerCo, us-gaap:ElectricityPurchased


Cost
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value759011967501221377864110152806420514061
Percentage of CostOfGoodsAndServicesSold0.00.0119800.0649.01575.00.06880.0699.1758.81176.61440.6609.11112.12313.53797.3736.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.02.10.01.71.43.33.81.81.82.74.01.91.65.13.71.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AppalachianPowerCo us-gaap:ElectricityPurchased0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:IndianaMichiganPowerCo, us-gaap:ElectricityGeneration


Cost
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value49361644485329614257719573775676
Percentage of CostOfGoodsAndServicesSold0.00.016000.0426.91512.50.01470.0546.4498.8612.8674.5726.51265.5870.81537.8920.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.30.80.01.11.41.40.81.41.21.41.92.21.81.91.51.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:IndianaMichiganPowerCo us-gaap:ElectricityGeneration0.00.00.00.00.067.90.059.937.451.50.0102.551.70.00.00.0

aep:IndianaMichiganPowerCo, us-gaap:ElectricityPurchased


Cost
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value39475437405069444869544863555132
Percentage of CostOfGoodsAndServicesSold0.00.054100.0360.61265.60.03450.0400.0575.3740.4510.4370.51089.7624.71378.4396.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.01.10.00.91.21.31.91.01.41.71.41.11.61.41.30.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:IndianaMichiganPowerCo us-gaap:ElectricityPurchased0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:OhioPowerCo, us-gaap:ElectricityPurchased


Cost
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value153175136149113149153158121174149166162205180180
Percentage of CostOfGoodsAndServicesSold0.00.0136900.01435.63559.40.07665.01413.41429.41853.21414.21259.82808.62309.04878.42177.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax4.04.10.03.73.34.04.23.73.44.33.93.84.05.14.74.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:OhioPowerCo us-gaap:ElectricityPurchased0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:PublicServiceCoOfOklahoma, aep:PurchasedElectricityFuelAndOtherConsumablesUsedForElectricGeneration


Cost
Period End2021-06-302021-03-312020-06-302020-03-31
Value12412097127
Percentage of CostOfGoodsAndServicesSold0.00.03043.80.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.22.82.83.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:PublicServiceCoOfOklahoma aep:PurchasedElectricityFuelAndOtherConsumablesUsedForElectricGeneration0.00.00.00.0

aep:PublicServiceCoOfOklahoma, us-gaap:ElectricityGeneration


Cost
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-20.620-1.616139844382910458481877
Percentage of CostOfGoodsAndServicesSold-20600.0201.0-50.00.0695.0878.6527.1404.3273.6790.91012.1543.8505.4938.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.5-0.00.50.42.31.30.90.82.41.41.20.51.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:PublicServiceCoOfOklahoma us-gaap:ElectricityGeneration0.00.00.0889.50.0466.4772.4441.90.0835.2707.20.00.00.0

aep:PublicServiceCoOfOklahoma, us-gaap:ElectricityPurchased


Cost
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value11310499110118115102122127116113122135127
Percentage of CostOfGoodsAndServicesSold113800.01006.73093.80.05910.01029.51205.91307.41203.8884.81950.01375.33651.41539.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.02.62.82.93.32.72.93.03.42.72.83.03.53.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:PublicServiceCoOfOklahoma us-gaap:ElectricityPurchased0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:SouthwesternElectricPowerCo, aep:PurchasedElectricityFuelAndOtherConsumablesUsedForElectricGeneration


Cost
Period End2021-06-302021-03-312020-06-302020-03-31
Value138299126132
Percentage of CostOfGoodsAndServicesSold0.00.03956.20.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.67.03.63.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo aep:PurchasedElectricityFuelAndOtherConsumablesUsedForElectricGeneration0.00.00.00.0

aep:SouthwesternElectricPowerCo, us-gaap:ElectricityGeneration


Cost
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value137131858972148117133108152114126106147
Percentage of CostOfGoodsAndServicesSold137100.01266.32675.00.03630.01328.61387.11420.21027.41152.31974.11424.72873.01777.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.03.22.42.42.03.43.33.32.93.52.83.12.83.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo us-gaap:ElectricityGeneration0.00.00.0261.30.0293.5263.2233.40.0285.9205.60.00.00.0

aep:SouthwesternElectricPowerCo, us-gaap:ElectricityPurchased


Cost
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value3541414369443332443653425040
Percentage of CostOfGoodsAndServicesSold35900.0394.21281.20.03450.0400.0389.4346.8418.9277.3920.7479.81351.4481.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.01.01.21.21.91.00.90.81.20.81.31.11.31.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo us-gaap:ElectricityPurchased0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CostOfGoodsAndServicesSold us-gaap:ProductOrService

aep:PurchasedElectricityFuelAndOtherConsumablesUsedForElectricGeneration


Cost
Period End2021-06-302021-03-312020-06-302020-03-31
Value112415609641151
Percentage of CostOfGoodsAndServicesSold0.00.030153.10.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax29.436.527.630.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:PurchasedElectricityFuelAndOtherConsumablesUsedForElectricGeneration0.00.00.00.0

us-gaap:ElectricityGeneration


Cost
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value264459360355278631480550450840566501481707
Percentage of CostOfGoodsAndServicesSold264400.04416.311259.40.013920.05635.75657.65855.34248.16366.79774.15638.213005.48522.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.011.310.39.57.714.613.513.611.819.414.012.412.617.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ElectricityGeneration0.00.00.0192.60.0230.293.8186.80.0349.0164.40.00.00.0

us-gaap:ElectricityPurchased


Cost
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value789741604795858783660861875784776990808718
Percentage of CostOfGoodsAndServicesSold789000.07126.018893.80.042940.06999.17772.99168.18258.55944.713391.411127.021848.68651.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.018.217.321.223.818.218.521.223.018.119.124.521.217.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ElectricityPurchased0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CostOfGoodsAndServicesSold us-gaap:ProductOrService, us-gaap:DerivativeInstrumentRisk, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ElectricityPurchased, us-gaap:CommodityContract, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Cost
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-9.5-172.031335151178.52112-9.0-5.8-4.7-13.12.84.9
Percentage of CostOfGoodsAndServicesSold0.00.031900.0320.21603.10.0875.075.9249.4130.9-84.9-43.9-81.0-147.275.759.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.2-4.00.00.81.51.40.50.20.60.3-0.2-0.1-0.1-0.30.10.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ElectricityPurchased us-gaap:CommodityContract us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CostOfGoodsAndServicesSold us-gaap:ProductOrService, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome

us-gaap:ElectricityPurchased, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome


Cost
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-9.5-172.031335151178.52112-9.0-5.8-4.7-13.12.84.9
Percentage of CostOfGoodsAndServicesSold0.00.031900.0320.21603.10.0875.075.9249.4130.9-84.9-43.9-81.0-147.275.759.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.2-4.00.00.81.51.40.50.20.60.3-0.2-0.1-0.1-0.30.10.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ElectricityPurchased us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value60460438973250751688759387600368480583540554800550910407-1323.9678713292775631940318739583850492680393545-6.0715543570235984521627287812201549
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax15.814.10.018.014.513.82.417.610.814.89.711.114.413.414.519.515.423.110.7-28.517.417.68.117.516.020.07.917.214.418.313.016.311.014.2-0.217.215.315.76.822.714.416.88.420.06.015.4

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments dei:LegalEntity

aep:AEPTexasInc.


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value895342834855-28.59024385466555566947451
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments14.88.811.011.49.510.7-32.311.96.26.414.813.79.510.312.011.913.65.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.31.20.02.11.41.5-0.82.10.70.91.41.51.41.41.72.32.11.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTexasInc.0.00.00.00.00.00.00.00.00.010.90.016.215.015.80.00.00.00.0

aep:AEPTransmissionCo


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value187191138149931491181371691319295901089490163855978111
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments31.031.635.520.418.329.0134.518.143.622.025.019.915.520.117.011.329.69.414.7-6.016.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax4.94.50.03.72.74.03.33.24.73.32.42.22.22.72.52.24.62.21.61.72.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTransmissionCo0.00.00.00.00.00.00.00.00.053.80.046.347.751.50.00.00.00.00.00.00.0

aep:AppalachianPowerCo


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value771276610873125-18.210036109688.29315313112982174911621141999111510122662805916854104491171019797126568443676167-31.71
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments12.721.116.914.914.524.4-20.713.29.418.318.41.716.028.423.716.114.919.122.5-12.316.927.931.114.916.124.119.610.810.319.811.115.312.721.6-1697.013.617.922.224.28.58.410.821.58.3-15.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.03.00.02.72.13.4-0.52.31.02.71.80.22.33.83.43.12.34.42.43.52.94.92.52.62.64.81.51.91.53.61.42.51.43.12.82.32.73.51.71.91.21.81.81.7-0.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AppalachianPowerCo0.00.00.00.00.00.00.00.00.013.90.01.113.718.60.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:IndianaMichiganPowerCo


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value517036796892158660963286957662931497211107698348474107224739125418560643.7615642552.8718043749.6179121
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments8.511.69.310.913.518.018.011.415.516.08.718.016.314.211.311.72.610.75.3-8.311.313.811.710.911.911.47.16.46.914.88.412.615.411.9-62.77.97.89.71.28.28.411.93.411.310.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.31.60.02.02.02.50.42.01.72.40.82.02.41.91.62.30.42.50.62.42.02.40.91.91.92.30.61.11.02.71.12.11.71.70.11.41.21.50.11.91.22.00.32.30.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:IndianaMichiganPowerCo0.00.00.00.00.00.00.00.00.015.50.013.915.813.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:OhioPowerCo


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value8574627792844380601471016087100124130951325814611310773110731017882929413127232199-129.2362341622203515611525447815857
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments14.112.316.110.518.116.449.310.615.624.627.412.615.018.522.416.417.414.614.4-11.116.715.125.214.211.710.824.711.215.811.226.740.08.336.62153.932.729.938.7149.75.722.240.6166.819.628.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.21.70.01.92.62.31.21.91.73.62.71.42.22.53.33.22.73.41.63.12.92.72.02.51.92.21.91.92.32.03.56.50.95.2-3.65.64.66.110.21.33.26.813.93.91.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:OhioPowerCo0.00.00.00.00.00.00.00.00.017.80.08.211.512.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:PublicServiceCoOfOklahoma


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value44-2.59.6999999999999858147-10.2-10.5107426.2-10.26443-8.68.173327.70.48445237.018724321147335131183462210935620259052242.0958924
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments7.3-0.42.511.19.3-2.0-11.914.110.91.0-2.813.37.4-1.61.59.25.90.80.1-6.46.73.32.49.36.82.34.610.06.11.62.412.311.84.1-166.713.110.43.611.09.210.03.80.711.012.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.2-0.10.02.01.3-0.3-0.32.51.20.2-0.31.51.1-0.20.21.80.90.20.01.81.20.60.21.61.10.50.41.70.90.30.32.01.30.60.32.21.60.60.72.11.40.60.12.20.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:PublicServiceCoOfOklahoma0.00.00.00.00.00.00.00.00.01.90.013.410.9-2.60.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:SouthwesternElectricPowerCo


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value43681698669.19.21096.529129843151310644251111456305.3251198567191044934136224517181136548-15.52312170421911334
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments7.211.34.113.513.11.810.414.51.74.83.320.57.42.92.413.38.12.82.9-8.78.34.31.815.413.57.26.214.28.54.127.63.311.53.2-302.515.912.18.5-6.612.313.66.86.814.017.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.11.60.02.41.90.20.32.50.20.70.32.31.10.40.32.61.20.60.32.51.40.80.12.72.21.40.52.41.20.73.60.51.30.50.52.71.81.3-0.52.82.01.10.62.81.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo0.00.00.00.00.00.00.00.00.06.80.018.49.63.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value6154-17.4-1.21246-43.640-54.44421-80.77210217126419034360-534.51652359227522533315126921530716425768195-16.02411901893233417427811325865207
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.61.30.0-0.00.41.2-1.20.9-1.51.10.6-1.91.82.54.56.45.38.71.6-11.54.25.82.66.25.77.13.86.35.36.64.36.21.95.1-0.45.85.45.20.97.74.87.53.36.31.95.8

us-gaap:IncomeTaxExpenseBenefit dei:LegalEntity

aep:AEPTexasInc.


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value9.97.1-1.11.1-18.67.4-14.813-56.54.0-5.68.39.09.1-97.6302517
Percentage of IncomeTaxExpenseBenefit16.213.06.3-91.7-147.615.933.933.7103.99.0-25.7-10.312.58.9-56.811.613.65.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.30.20.00.0-0.50.2-0.40.3-1.60.1-0.10.20.20.2-2.60.70.70.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTexasInc.0.00.00.00.00.00.00.00.00.01.10.02.02.42.60.00.00.00.0

aep:AEPTransmissionCo


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value393923311931263033272017202232305528202637
Percentage of IncomeTaxExpenseBenefit63.972.7-137.4-2641.7153.268.4-61.274.1-60.762.093.6-21.827.722.119.011.429.38.333.5-4.922.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.00.90.00.80.60.80.70.70.90.70.50.40.50.60.90.71.60.70.50.61.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTransmissionCo0.00.00.00.00.00.00.00.00.011.30.08.510.510.70.00.00.00.00.00.00.0

aep:AppalachianPowerCo


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value105.09.5-7.7-7.910-31.0-3.9-19.0-24.1-9.8-78.91528484329632658417225404285333123662441194745343451173112282517-12.091
Percentage of IncomeTaxExpenseBenefit17.59.2-54.6641.7-62.722.471.1-9.634.9-54.2-45.097.821.927.528.316.415.718.543.8-11.024.931.028.014.719.025.622.311.711.021.614.916.229.324.1-282.214.218.427.155.09.37.110.422.86.8-18.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.30.10.0-0.2-0.20.3-0.9-0.1-0.5-0.6-0.3-1.80.40.71.31.10.81.60.71.31.11.80.70.91.11.80.80.70.61.40.61.00.61.21.20.81.01.40.50.70.30.80.70.4-0.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AppalachianPowerCo0.00.00.00.00.00.00.00.00.0-3.10.0-10.32.33.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:IndianaMichiganPowerCo


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value-5.8-0.7-15.83.24.70.4-5.5-2.3-0.1-2.72.3130.71219284.029-16.83525249.3752724348.0252012386.009271921-6.411161216-18.2882812295.486296.729
Percentage of IncomeTaxExpenseBenefit-9.5-1.390.8-266.737.30.912.6-5.70.2-6.110.6-17.01.012.211.410.82.18.5-27.9-6.615.210.210.110.110.810.45.37.75.912.53.710.929.210.940.17.06.68.6-57.18.57.010.54.911.510.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.2-0.00.00.10.10.0-0.2-0.1-0.0-0.10.10.30.00.30.50.70.10.7-0.40.80.60.60.30.60.60.70.20.50.30.80.20.70.60.6-0.20.40.40.5-0.50.70.30.80.20.70.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:IndianaMichiganPowerCo0.00.00.00.00.00.00.00.00.0-0.40.02.20.12.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:OhioPowerCo


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value116.16.218119.7-6.0119.91912-28.119203148334621463837253826353328353451931169-69.0078261691099.21239881675819
Percentage of IncomeTaxExpenseBenefit18.311.2-35.6-1508.388.920.913.827.6-18.244.557.834.826.320.118.218.317.513.535.3-8.723.415.927.914.011.710.822.210.716.711.131.336.216.735.8431.334.332.236.8343.22.823.031.9148.222.530.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.30.10.00.40.30.3-0.20.30.30.50.3-0.60.50.50.81.20.91.20.61.01.00.90.70.90.70.80.80.70.90.71.42.20.31.8-1.92.01.71.93.20.21.12.44.91.40.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:OhioPowerCo0.00.00.00.00.00.00.00.00.02.40.0-3.82.52.60.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:PublicServiceCoOfOklahoma


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value-1.80.23.11.30.70.10.36.90.30.0-3.63.66.4-1.47.527122.9-2.232168.20.0427158.0413.60328134.9897.10732178.6341.82235218.1015.46632208.6194.368349.042
Percentage of IncomeTaxExpenseBenefit-2.90.4-17.8-108.35.60.2-0.717.0-0.60.0-16.5-4.58.9-1.44.410.46.50.8-3.6-6.09.93.50.09.97.12.42.410.76.21.64.312.526.44.4-11.414.711.34.317.19.911.83.13.913.313.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.00.00.00.00.00.00.00.20.00.0-0.10.10.2-0.00.20.70.30.1-0.10.70.40.20.00.60.40.20.10.70.30.10.20.80.50.20.10.90.60.20.20.80.60.20.10.80.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:PublicServiceCoOfOklahoma0.00.00.00.00.00.00.00.00.00.00.00.81.6-0.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:SouthwesternElectricPowerCo


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value7.15.6-3.1107.9-6.2-4.7-0.70.00.72.59.65.42.92.922139.5-1.833137.4-0.6173726216.1683117123214156.796-3.348251112-11.28134201312328.707
Percentage of IncomeTaxExpenseBenefit11.610.317.8-900.062.7-13.310.8-1.7-0.01.611.5-11.97.52.81.78.56.92.8-3.0-6.28.13.1-0.713.611.96.44.111.57.94.019.85.822.53.520.910.56.16.6-35.310.211.84.811.012.713.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.20.10.00.30.2-0.2-0.1-0.00.00.00.10.20.10.10.10.50.40.2-0.00.70.30.2-0.00.80.70.40.20.70.40.30.90.40.40.2-0.10.60.30.3-0.30.80.60.40.40.80.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo0.00.00.00.00.00.00.00.00.00.20.01.81.20.70.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:IncomeTaxExpenseBenefit dei:LegalEntity, us-gaap:DerivativeInstrumentRisk, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

aep:AEPTexasInc., aep:InterestRate, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.00.10.10.10.00.10.20.00.0-0.1-0.1-0.10.0-0.1-0.1-0.1-0.1-0.1
Percentage of IncomeTaxExpenseBenefit0.00.2-0.6-8.30.00.2-0.50.0-0.0-0.2-0.50.10.0-0.1-0.1-0.0-0.1-0.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.00.00.00.00.00.0-0.0-0.0-0.00.0-0.0-0.0-0.0-0.0-0.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTexasInc. aep:InterestRate us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:AppalachianPowerCo, aep:InterestRate, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value0.0-0.1-0.1-0.10.0-0.1-0.10.00.00.10.00.10.00.10.10.10.10.10.20.00.10.1
Percentage of IncomeTaxExpenseBenefit0.0-0.20.68.30.0-0.20.20.0-0.00.20.0-0.10.00.10.10.00.10.00.3-0.00.10.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.0-0.00.0-0.00.0-0.0-0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AppalachianPowerCo aep:InterestRate us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:IndianaMichiganPowerCo, aep:InterestRate, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value0.10.10.10.10.10.10.20.00.1-0.1-0.1-0.1-0.1-0.1-0.2-0.2-0.1-0.2-0.2-0.2-0.2-0.1
Percentage of IncomeTaxExpenseBenefit0.20.2-0.6-8.30.80.2-0.50.0-0.2-0.2-0.50.1-0.1-0.1-0.1-0.1-0.1-0.1-0.30.0-0.1-0.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.00.00.00.00.00.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:IndianaMichiganPowerCo aep:InterestRate us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:PublicServiceCoOfOklahoma, aep:InterestRate, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Income
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-0.10.0-0.1-0.1-0.20.1-0.10.10.10.00.10.10.10.20.10.10.10.10.10.1
Percentage of IncomeTaxExpenseBenefit0.6-0.0-0.8-0.20.50.20.20.20.5-0.00.10.10.10.10.10.00.2-0.00.10.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.0-0.0-0.0-0.00.0-0.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:PublicServiceCoOfOklahoma aep:InterestRate us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:SouthwesternElectricPowerCo, aep:InterestRate, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value0.10.10.10.10.10.10.20.00.1-0.1-0.1-0.1-0.1-0.1-0.2-0.2-0.2-0.2-0.3-0.3-0.2-0.2
Percentage of IncomeTaxExpenseBenefit0.20.2-0.6-8.30.80.2-0.50.0-0.2-0.2-0.50.1-0.1-0.1-0.1-0.1-0.1-0.1-0.50.1-0.1-0.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.00.00.00.00.00.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo aep:InterestRate us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:IncomeTaxExpenseBenefit dei:LegalEntity, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome

aep:AEPTexasInc., us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.00.10.10.10.00.10.20.00.0-0.1-0.2-0.10.0-0.1-0.1-0.1-0.2-0.1
Percentage of IncomeTaxExpenseBenefit0.00.2-0.6-8.30.00.2-0.50.0-0.0-0.2-0.90.10.0-0.1-0.1-0.0-0.1-0.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.00.00.00.00.00.0-0.0-0.0-0.00.0-0.0-0.0-0.0-0.0-0.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTexasInc. us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:AppalachianPowerCo, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-0.3-0.4-0.3-0.4-0.2-0.4-0.3-0.2-0.10.30.20.30.20.10.20.30.20.30.30.20.30.30.40.30.20.2
Percentage of IncomeTaxExpenseBenefit-0.5-0.71.733.3-1.6-0.90.7-0.50.20.70.9-0.40.30.10.10.10.10.10.5-0.00.20.10.40.10.10.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.0-0.00.0-0.0-0.0-0.0-0.0-0.0-0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AppalachianPowerCo us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:IndianaMichiganPowerCo, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value0.10.10.10.10.10.10.20.00.1-0.1-0.1-0.1-0.1-0.1-0.2-0.2-0.1-0.2-0.2-0.2-0.2-0.1-0.2-0.1-0.2-0.1
Percentage of IncomeTaxExpenseBenefit0.20.2-0.6-8.30.80.2-0.50.0-0.2-0.2-0.50.1-0.1-0.1-0.1-0.1-0.1-0.1-0.30.0-0.1-0.0-0.2-0.0-0.1-0.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.00.00.00.00.00.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:IndianaMichiganPowerCo us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:IncomeTaxExpenseBenefit dei:LegalEntity, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

aep:AppalachianPowerCo, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Income
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-0.3-0.3-0.3-0.2-0.3-0.2-0.10.20.20.20.20.20.10.20.20.20.20.260.2470.2470.2460.1790.1790.180.179-0.193-0.193-0.193-0.193
Percentage of IncomeTaxExpenseBenefit-0.5-0.625.0-1.6-0.6-0.50.20.4-0.20.30.20.10.10.1-0.00.10.10.30.10.10.10.10.10.10.1-0.1-0.1-0.3-0.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.0-0.0-0.0-0.0-0.0-0.0-0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0-0.0-0.0-0.0-0.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AppalachianPowerCo us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:SouthwesternElectricPowerCo, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Income
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-0.1-0.1-0.1-0.1-0.10.0-0.10.10.10.10.10.10.10.10.10.10.10.1130.1290.1290.1290.1270.1250.1270.1260.0340.0340.0350.034
Percentage of IncomeTaxExpenseBenefit-0.2-0.28.3-0.8-0.20.00.20.2-0.10.10.10.00.10.0-0.00.10.00.10.00.10.00.10.00.10.00.00.00.10.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.0-0.0-0.0-0.0-0.00.0-0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:IncomeTaxExpenseBenefit dei:LegalEntity, us-gaap:StatementBusinessSegments

aep:AEPTransmissionCo, aep:AEPTCoParent


Income
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value0.10.00.10.00.10.10.10.00.2-0.80.60.20.00.00.10.1-0.30.00.0
Percentage of IncomeTaxExpenseBenefit-0.6-0.00.80.0-0.20.2-0.20.00.91.00.80.20.00.00.10.0-0.5-0.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.00.00.00.00.00.0-0.00.00.00.00.00.00.0-0.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTransmissionCo aep:AEPTCoParent0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:AEPTransmissionCo, aep:StateTranscos


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value393923311931263032272018192232305528202637
Percentage of IncomeTaxExpenseBenefit63.972.7-136.8-2641.7152.468.4-61.073.9-60.562.092.7-22.826.921.919.011.429.28.334.0-4.922.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.00.90.00.80.50.80.70.70.90.70.50.40.50.60.90.71.60.70.50.61.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTransmissionCo aep:StateTranscos0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:IncomeTaxExpenseBenefit us-gaap:DerivativeInstrumentRisk, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

aep:InterestRate, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value0.30.40.20.20.40.20.10.00.10.0-0.1-0.10.0-0.10.0-0.2-0.1-0.1-0.3-0.2-0.2-0.2
Percentage of IncomeTaxExpenseBenefit0.50.7-1.1-16.73.20.4-0.20.0-0.20.0-0.50.10.0-0.10.0-0.1-0.1-0.0-0.50.0-0.1-0.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.00.00.00.00.00.00.0-0.0-0.00.0-0.00.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:InterestRate us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommodityContract, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-2.0-36.06.77.110103.81.84.4-2.61.91.30.92.8-1.0-1.4-2.9-2.8-0.61.31.2-0.21.03.0-1.04.2
Percentage of IncomeTaxExpenseBenefit-3.3-66.1-38.5-591.784.123.0-8.74.4-8.1-5.88.7-1.61.22.7-0.6-0.5-1.5-0.8-1.0-0.20.7-0.11.11.1-0.41.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.1-0.80.00.20.30.30.10.00.1-0.10.00.00.00.1-0.0-0.0-0.1-0.1-0.00.00.0-0.00.00.1-0.00.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:CommodityContract us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:IncomeTaxExpenseBenefit us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value-2.3-36.16.46.810103.51.44.2-2.22.11.61.23.1-1.2-1.7-3.1-3.1-1.01.10.9-0.50.22.9-1.23.7
Percentage of IncomeTaxExpenseBenefit-3.8-66.2-36.8-566.784.122.4-8.03.4-7.7-4.99.6-2.01.73.0-0.7-0.6-1.6-0.9-1.7-0.20.5-0.20.21.1-0.51.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.1-0.80.00.20.30.30.10.00.1-0.10.10.00.00.1-0.0-0.0-0.1-0.1-0.00.00.0-0.00.00.1-0.00.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:IncomeTaxExpenseBenefit us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Income
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-0.6-0.5-0.5-0.4-0.5-0.4-0.30.40.40.30.4-0.1-0.1-0.20.0-0.1-0.1-0.60.00.00.00.0-1.0-1.0-1.0-3.0-4.0-2.0-3.0
Percentage of IncomeTaxExpenseBenefit-1.0-0.941.7-3.2-1.1-1.00.60.9-0.50.40.4-0.0-0.1-0.1-0.0-0.1-0.0-0.60.00.00.00.0-0.4-0.5-0.3-1.8-1.6-2.9-1.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.0-0.0-0.0-0.0-0.0-0.0-0.00.00.00.00.0-0.0-0.0-0.00.0-0.0-0.0-0.00.00.00.00.0-0.0-0.0-0.0-0.1-0.1-0.1-0.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Income Taxes Paid Net

us-gaap:IncomeTaxesPaidNet

us-gaap:IncomeTaxesPaidNet


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value8.8-0.2-25.2-27.03.7-0.6-16.73.120-0.63.2-61.734-0.95.71467-88.8-2.76.0187.34.218962.08.04669-6.09.0-54.09.0-19.0-38.0-2.023-65.01.0-134.0132.0-25.0-417.0176-2.0
Percentage of IncomeTaxesPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.2-0.00.0-0.70.1-0.0-0.50.10.6-0.00.1-1.40.9-0.00.10.41.9-2.3-0.10.10.50.20.10.42.40.00.21.11.7-0.10.2-1.30.3-0.5-1.1-0.00.6-1.80.0-3.10.40.1-0.7-10.35.2-0.1

us-gaap:IncomeTaxesPaidNet dei:LegalEntity

aep:AEPTexasInc.


Income
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value12-30.7-24.90.0-39.71420-5.6228.2-22.40.0-5.0-24.8
Percentage of IncomeTaxesPaidNet-50.4113.7-673.0-0.0237.7461.398.5933.3690.6-13.3-64.6-0.0-87.7-172.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.0-0.8-0.70.0-1.10.30.6-0.10.60.2-0.60.0-0.1-0.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTexasInc.0.00.00.00.00.00.00.0-1.60.02.0-6.00.00.00.0

aep:AEPTransmissionCo


Income
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value21-11.6130.1-28.31218-1.21.4-11.7-20.40.0-13.9-26.4-66.4-0.6-25.3-31.8
Percentage of IncomeTaxesPaidNet-83.343.0362.2-16.7169.5400.091.6200.043.819.0-58.8-0.0-243.9-183.3-98.20.7937.0-530.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.0-0.30.40.0-0.80.30.5-0.00.0-0.3-0.50.0-0.4-0.6-1.9-0.0-0.7-0.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTransmissionCo0.00.00.00.00.00.00.0-0.50.0-5.7-10.70.00.00.00.00.00.00.0

aep:AppalachianPowerCo


Income
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-18.17.40.04.323278.0-39.77.0190.06.8-7.6320.0-33.72746-17.9-3.312285.1650.061-6.249201.280.0-24.013-4.1710.1940.2312020-7.106-2.9847.864-41.013-34.00.629-13.092-170.372
Percentage of IncomeTaxesPaidNet67.0200.0-0.0-25.7764.5133.0-1333.3-1240.6-11.356.8-0.0119.3-52.847.3-0.01248.1458.3244.4-245.2-78.9158.35.43.0-78.145.41.9-0.0-266.87.72.2-1.2-54.1-1048.0-30.94.6786.430.6-261.531.452.440.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.40.20.00.10.50.80.2-1.00.20.50.00.2-0.20.90.0-0.90.61.2-0.4-0.10.60.10.0-0.20.50.00.0-0.6-0.10.00.00.60.5-0.2-0.10.2-0.9-0.90.0-0.4-4.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AppalachianPowerCo0.00.00.00.00.00.01.00.00.92.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:IndianaMichiganPowerCo


Income
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-17.611480.0-36.81231-3.359-2.9-23.60.0-20.3-12.7-57.50.6-3.5-12.4-18.7-4.93.9970.137151.959-8.729-14.681130.04.036-7.699-19.601-8.0077.8932.832-8.826-23.095-0.113-76.492-18.814-1.033-4.588-74.772
Percentage of IncomeTaxesPaidNet69.8-43.31297.3-0.0220.4396.8153.7550.01846.94.7-68.0-0.0-356.1-88.2-85.1-0.7129.6-206.7-98.9-67.195.20.815.798.0-109.1-31.919.1-0.044.814.3-217.842.1-20.8-141.6-38.435.5-11.357.1-144.7-51.618.417.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.31.40.0-1.00.30.9-0.11.6-0.1-0.60.0-0.5-0.3-1.60.0-0.1-0.3-0.5-0.10.10.00.40.0-0.2-0.30.30.00.1-0.2-0.5-0.20.20.1-0.2-0.6-0.0-1.8-0.5-0.0-0.1-1.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:IndianaMichiganPowerCo0.00.00.00.00.00.00.0-0.50.0-0.5-3.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:OhioPowerCo


Income
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-20.9-8.42.40.0-18.41114-0.2-2.89.0450.0-21.1-7.2751.7424559722.043.5620-0.046284.66100.054-10.39551-2.39361822-7.3593916241.27332-137.833
Percentage of IncomeTaxesPaidNet82.931.164.9-0.0110.2367.771.433.3-87.5-14.6130.0-0.0-370.2-50.0111.1-1.9-1570.4761.7316.4993.248.619.821.4-2.3356.410.115.7-0.0609.819.2569.212.6-95.7-919.097.311.33986.9-12.1187.763.6-129.433.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.0-0.20.10.0-0.50.30.4-0.0-0.10.21.10.0-0.6-0.22.10.01.11.01.51.80.10.10.5-0.00.70.10.30.01.5-0.21.4-0.11.00.40.6-0.21.20.40.70.00.9-3.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:OhioPowerCo0.00.00.00.00.00.00.0-0.00.01.25.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:PublicServiceCoOfOklahoma


Income
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-2.3-6.8-2.70.06.44.9100.6163.4-1.80.0-26.0-3.7-40.3-2.612-8.3-18.8-23.2-4.8728.5444.2280.0-20.734-2.8792.3960.0676.645-4.2696.0110.2849.241111.1194.87310-26.9190.0970.2861.75-10.447
Percentage of IncomeTaxesPaidNet9.125.2-73.0-0.0-38.3158.151.7-100.0509.4-5.5-5.2-0.0-456.1-25.7-59.62.9-466.7-138.3-99.5-317.8-116.047.54.40.0-259.2-6.33.5-1.173.87.966.8-1.5-24.3-599.84.9-7.51049.320.10.714.3-7.02.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.0-0.2-0.10.00.20.10.30.00.40.1-0.00.0-0.7-0.1-1.1-0.10.3-0.2-0.5-0.6-0.10.20.10.0-0.5-0.10.10.00.2-0.10.20.00.30.30.00.10.3-0.60.00.00.1-0.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:PublicServiceCoOfOklahoma0.00.00.00.00.00.00.00.20.00.7-0.50.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:SouthwesternElectricPowerCo


Income
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-7.63.88.10.01.31.16.00.25.9-3.416-0.1-4.8-14.0-56.50.034-37.2-43.4143.082.69210-0.938-138.393-6.264-8.290.734-35.628-0.8969.548-8.387-79.348-64.549-48.9091.1688.25-16.6127.3280.698-17.2255.912
Percentage of IncomeTaxesPaidNet30.2-14.1218.9-0.0-7.835.529.6-33.3184.45.547.311.1-84.2-97.2-83.6-0.0-1281.5-620.0-229.6191.873.315.011.0-46.9-1729.9-13.6-12.0-12.2-395.91.7106.144.1208.83227.4-212.6-1.8825.012.456.434.968.9-1.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.10.20.00.00.00.20.00.2-0.10.4-0.0-0.1-0.3-1.60.00.9-0.8-1.10.30.10.10.3-0.0-3.4-0.1-0.20.0-0.9-0.00.3-0.2-2.2-1.6-1.40.00.2-0.40.20.0-0.50.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo0.00.00.00.00.00.00.00.00.0-0.63.6-0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value301290288291294292290275250255251256242234227223222221210225224217214221224223223221221220221225228232291233235229210242239242249251249250
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax7.96.80.07.28.47.88.06.47.06.36.65.96.05.86.05.46.25.65.54.85.85.45.95.05.74.75.55.15.54.75.95.46.46.18.15.66.66.36.15.66.66.57.36.27.47.0

us-gaap:InterestExpense dei:LegalEntity

aep:AEPTexasInc.


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value454342444242443519373837363536353535
Percentage of InterestExpense15.014.814.815.314.414.515.313.07.814.615.314.515.115.016.215.815.815.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.21.00.01.11.21.11.20.80.50.91.00.90.90.91.00.91.00.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTexasInc.0.00.00.00.00.00.00.00.00.010.60.09.29.99.90.00.00.00.0

aep:AEPTransmissionCo


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value343432323229272621212219201919161516131110
Percentage of InterestExpense11.411.811.311.211.210.19.69.68.58.59.07.78.48.58.57.67.07.26.54.94.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.90.80.00.80.90.80.80.60.60.50.60.50.50.50.50.40.40.40.40.20.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTransmissionCo0.00.00.00.00.00.00.00.00.08.80.09.610.79.50.00.00.00.00.00.00.0

aep:AppalachianPowerCo


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value525455555453525151494850474747474848474647474646485052525351494748484850515147515352515251
Percentage of InterestExpense17.518.919.218.918.418.218.018.820.619.319.419.819.720.320.921.121.621.722.820.621.021.721.721.121.722.623.323.924.023.522.321.121.120.816.821.522.122.422.521.222.321.920.621.020.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.41.30.01.41.51.41.51.21.41.21.31.21.21.21.21.11.31.21.31.01.21.21.31.11.21.11.31.21.31.11.31.11.31.31.31.21.51.41.41.21.51.41.51.31.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AppalachianPowerCo0.00.00.00.00.00.00.00.00.06.30.06.67.05.70.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:IndianaMichiganPowerCo


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value292726262830322828282834312927272727242627222123222221222325252324242626252524242425232826
Percentage of InterestExpense9.69.49.29.29.610.511.010.511.211.311.313.413.012.712.212.312.512.511.711.912.010.49.910.510.310.29.710.210.711.711.410.610.710.48.911.310.810.911.59.910.110.49.611.210.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.80.60.00.70.80.80.90.70.80.70.70.80.80.70.70.70.80.70.60.60.70.60.60.50.60.50.50.50.60.60.70.60.70.60.70.60.70.70.70.60.70.70.70.70.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:IndianaMichiganPowerCo0.00.00.00.00.00.00.00.00.04.70.05.65.25.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:OhioPowerCo


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value31312829302828272524242625252525262524272931313231323131323339454750525353541123536571233939
Percentage of InterestExpense10.510.910.010.110.29.99.710.110.29.69.610.210.410.811.111.511.711.311.712.112.914.514.714.714.014.614.114.114.815.017.920.020.721.617.923.022.623.753.614.815.223.649.815.515.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.80.70.00.70.90.80.80.60.70.60.60.60.60.60.70.60.70.60.60.60.70.80.90.70.80.70.80.70.80.71.01.11.31.31.41.31.51.53.30.81.01.53.61.01.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:OhioPowerCo0.00.00.00.00.00.00.00.00.03.00.03.53.33.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:PublicServiceCoOfOklahoma


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1414141415151616171616161614131313136.61415141414141413131313131313131313131410131415141515
Percentage of InterestExpense4.75.05.05.05.35.45.65.96.96.66.46.46.76.35.85.96.06.13.16.66.86.66.66.86.66.56.16.36.26.16.06.05.85.84.55.95.96.45.15.76.06.65.86.36.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.40.30.00.40.40.40.40.40.50.40.40.40.40.40.30.30.40.30.20.30.40.40.40.30.40.30.30.30.30.30.30.30.40.30.40.30.40.40.30.30.40.40.40.40.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:PublicServiceCoOfOklahoma0.00.00.00.00.00.00.00.00.05.10.03.44.24.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:SouthwesternElectricPowerCo


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value312929292930292930293232303230313029273231272829313030313131303233332321212217202022232321
Percentage of InterestExpense10.410.110.210.110.110.310.210.612.211.612.812.712.813.813.514.313.913.513.214.514.012.913.313.214.313.513.814.314.414.513.614.514.714.77.99.29.29.68.48.78.79.39.39.38.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.80.70.00.70.90.80.80.70.90.70.80.80.80.80.80.80.90.80.70.70.80.70.80.70.80.60.80.70.80.70.80.80.90.90.60.50.60.60.50.50.60.60.70.60.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo0.00.00.00.00.00.00.00.00.07.00.06.16.87.70.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:InterestExpense dei:LegalEntity, us-gaap:ConsolidationItems

aep:AEPTransmissionCo, srt:ConsolidationEliminations


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-38.2-38.2-38.2-38.2-38.3-33.4-33.7-31.9-28.6-27.9-28.1-25.7-24.8-24.8-24.8-19.3
Percentage of InterestExpense-12.7-13.2-13.3-13.1-13.0-11.4-11.6-11.6-11.4-10.9-11.2-10.0-10.2-10.6-10.9-8.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-1.0-0.90.0-0.9-1.1-0.9-0.9-0.7-0.8-0.7-0.7-0.6-0.6-0.6-0.7-0.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTransmissionCo srt:ConsolidationEliminations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:InterestExpense dei:LegalEntity, us-gaap:DerivativeInstrumentRisk, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

aep:AEPTexasInc., aep:InterestRate, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.30.30.30.40.20.40.70.00.20.40.30.40.30.30.30.30.40.3
Percentage of InterestExpense0.10.10.10.10.10.10.20.00.10.20.10.20.10.10.10.10.20.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTexasInc. aep:InterestRate us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:AppalachianPowerCo, aep:InterestRate, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value0.0-0.4-0.5-0.2-0.2-0.4-0.60.0-0.2-0.3-0.2-0.4-0.2-0.3-0.3-0.2-0.3-0.3-0.3-0.2-0.3-0.3
Percentage of InterestExpense0.0-0.1-0.2-0.1-0.1-0.1-0.20.0-0.1-0.1-0.1-0.2-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.0-0.00.0-0.0-0.0-0.0-0.00.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AppalachianPowerCo aep:InterestRate us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:IndianaMichiganPowerCo, aep:InterestRate, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value0.50.60.50.50.50.51.00.00.50.50.50.40.60.50.50.50.50.50.50.50.50.5
Percentage of InterestExpense0.20.20.20.20.20.20.30.00.20.20.20.20.20.20.20.20.20.20.20.20.20.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:IndianaMichiganPowerCo aep:InterestRate us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:PublicServiceCoOfOklahoma, aep:InterestRate, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value0.0-0.1-0.3-0.3-0.4-0.3-0.80.2-0.4-0.3-0.4-0.2-0.4-0.3-0.3-0.4-0.3-0.3-0.3-0.3-0.3-0.3
Percentage of InterestExpense0.0-0.0-0.1-0.1-0.1-0.1-0.30.1-0.2-0.1-0.2-0.1-0.2-0.1-0.1-0.2-0.1-0.1-0.1-0.1-0.1-0.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.0-0.00.0-0.0-0.0-0.0-0.00.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:PublicServiceCoOfOklahoma aep:InterestRate us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:SouthwesternElectricPowerCo, aep:InterestRate, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value0.50.50.50.50.40.50.90.00.50.50.50.50.60.50.50.60.40.70.70.70.60.7
Percentage of InterestExpense0.20.20.20.20.10.20.30.00.20.20.20.20.20.20.20.30.20.30.30.30.30.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo aep:InterestRate us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:InterestExpense dei:LegalEntity, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome

aep:AEPTexasInc., us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.30.30.30.40.20.40.70.00.20.40.30.40.30.30.30.30.40.3
Percentage of InterestExpense0.10.10.10.10.10.10.20.00.10.20.10.20.10.10.10.10.20.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTexasInc. us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:AppalachianPowerCo, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value0.0-0.4-0.5-0.2-0.2-0.4-0.60.0-0.2-0.3-0.2-0.4-0.2-0.3-0.3-0.2-0.3-0.3-0.3-0.2-0.3-0.3-0.3-0.30.00.2
Percentage of InterestExpense0.0-0.1-0.2-0.1-0.1-0.1-0.20.0-0.1-0.1-0.1-0.2-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.10.00.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.0-0.00.0-0.0-0.0-0.0-0.00.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AppalachianPowerCo us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:IndianaMichiganPowerCo, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value0.50.60.50.50.50.51.00.00.50.50.50.40.60.50.50.50.50.50.50.50.50.50.50.40.40.4
Percentage of InterestExpense0.20.20.20.20.20.20.30.00.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:IndianaMichiganPowerCo us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:SouthwesternElectricPowerCo, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value0.50.50.50.50.40.50.90.00.50.50.50.50.60.50.50.60.40.70.70.70.60.70.70.70.80.9
Percentage of InterestExpense0.20.20.20.20.10.20.30.00.20.20.20.20.20.20.20.30.20.30.30.30.30.30.30.30.40.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:InterestExpense dei:LegalEntity, us-gaap:StatementBusinessSegments

aep:AEPTransmissionCo, aep:AEPTCoParent


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value383838383833333128272825242424191919161313
Percentage of InterestExpense12.713.213.313.113.011.411.611.611.410.911.210.010.210.610.98.68.68.77.86.26.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.00.90.00.91.10.90.90.70.80.70.70.60.60.60.70.50.50.50.40.30.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTransmissionCo aep:AEPTCoParent0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:AEPTransmissionCo, aep:StateTranscos


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value343432323229272621212219201919161515131110
Percentage of InterestExpense11.411.811.311.211.210.19.69.68.58.59.07.78.48.58.57.67.17.16.34.94.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.90.80.00.80.90.80.80.60.60.50.60.50.50.50.50.40.40.40.40.20.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTransmissionCo aep:StateTranscos0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:InterestExpense us-gaap:DerivativeInstrumentRisk, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

aep:InterestRate, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1.81.51.31.31.40.91.00.00.30.20.20.40.20.30.30.40.30.50.70.60.60.5
Percentage of InterestExpense0.60.50.50.40.50.30.30.00.10.10.10.20.10.10.10.20.10.20.30.30.30.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:InterestRate us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:InterestExpense us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value1.81.51.31.31.40.91.00.00.30.20.20.40.20.30.30.40.30.50.70.60.60.51.9-0.20.01.2
Percentage of InterestExpense0.60.50.50.40.50.30.30.00.10.10.10.20.10.10.10.20.10.20.30.30.30.20.9-0.10.00.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.1-0.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Interest Paid Net

us-gaap:InterestPaidNet

us-gaap:InterestPaidNet


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value339220338209268212332199321168308175267188244171236205211211226199218208208223189227188234180247202253233254179265184274192250203268216271
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax8.95.20.05.17.75.79.24.69.04.28.14.16.64.76.44.26.65.25.64.55.84.96.04.75.34.74.75.34.65.04.85.95.66.66.46.15.07.35.36.35.36.75.96.66.47.6

us-gaap:InterestPaidNet dei:LegalEntity

aep:AEPTexasInc.


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value523051275321532151225322412733313533
Percentage of InterestPaidNet15.313.615.113.219.89.916.110.915.913.317.413.015.514.813.718.515.116.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.40.70.00.71.50.61.50.51.40.61.40.51.00.70.90.81.00.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTexasInc.0.00.00.00.00.00.00.00.00.06.40.05.611.27.90.00.00.00.0

aep:AEPTransmissionCo


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-30
Value578.9567.5469.3472.0391.641-4.345-3.032-2.822-0.3
Percentage of InterestPaidNet17.04.016.73.617.34.414.31.012.30.913.6-2.417.1-1.613.3-1.610.4-0.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.50.20.00.21.30.21.30.01.10.01.1-0.11.1-0.10.9-0.10.6-0.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTransmissionCo0.00.00.00.00.00.00.00.00.00.70.0-2.124.1-1.40.00.00.00.0

aep:AppalachianPowerCo


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value7528772869317029771477136723761468236822672368226837594057395238613162375446524563366237
Percentage of InterestPaidNet22.313.122.813.526.015.021.114.524.08.625.27.725.212.431.38.629.011.632.410.529.911.631.311.032.816.731.617.830.416.929.415.630.712.326.814.830.317.428.516.732.914.830.813.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.00.70.00.72.00.91.90.72.20.42.00.31.70.62.00.41.90.61.80.51.70.61.90.51.70.81.50.91.40.81.40.91.70.81.70.91.51.31.51.11.71.01.80.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AppalachianPowerCo0.00.00.00.00.00.00.00.00.01.80.01.89.92.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:IndianaMichiganPowerCo


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value1042104111441343114312494.6502.8424.944-2.3455.1357.05357.272345.791338.187341332143018301929182818281930
Percentage of InterestPaidNet3.019.03.020.04.220.84.021.83.725.64.128.01.726.91.125.02.121.5-1.121.42.317.73.216.93.515.73.114.54.414.87.613.17.011.98.112.010.711.110.210.69.811.49.411.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.31.00.01.00.31.20.41.00.31.10.31.10.11.30.11.00.11.1-0.11.00.10.90.20.80.20.70.10.80.20.70.40.80.40.80.50.70.50.80.50.70.50.80.60.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:IndianaMichiganPowerCo0.00.00.00.00.00.00.00.00.07.00.07.90.88.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:OhioPowerCo


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value421541153716391529172919311731183217311842174217421842214523493955505450555211738175312337
Percentage of InterestPaidNet12.67.212.37.513.97.911.87.69.110.19.710.811.79.013.010.613.98.415.08.618.68.919.58.520.48.422.39.324.310.027.716.227.519.923.520.030.819.764.013.99.121.361.014.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.10.40.00.41.10.41.10.40.80.40.80.40.80.40.80.40.90.40.80.41.10.41.20.41.10.41.00.51.10.51.31.01.61.31.51.21.61.43.40.90.51.43.60.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:OhioPowerCo0.00.00.00.00.00.00.00.00.02.10.02.64.12.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:PublicServiceCoOfOklahoma


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value1516131413161415201020102110209.21515151415151415141015101610159.899151015101510141117-5.337207.763
Percentage of InterestPaidNet4.57.74.07.15.27.94.47.86.26.56.55.98.05.58.45.46.77.77.17.06.77.66.57.36.94.98.14.78.64.58.54.07.74.26.74.08.84.17.74.19.2-2.19.92.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.40.40.00.40.40.40.40.40.60.30.50.20.50.30.50.20.40.40.40.30.40.40.40.30.40.20.40.30.40.20.40.20.40.30.40.20.40.30.40.30.5-0.10.60.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:PublicServiceCoOfOklahoma0.00.00.00.00.00.00.00.00.03.30.02.15.43.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:SouthwesternElectricPowerCo


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value15391538164016381640234216431542165010509.8476.522502.409533.718534.878554.8536.03755-5.73842-6.98639-6.52640-3.96541-1.54142
Percentage of InterestPaidNet4.718.04.618.36.119.14.819.05.224.07.524.36.023.26.124.86.924.64.923.74.324.03.024.21.223.92.023.42.623.62.721.83.022.0-2.516.6-3.914.9-3.514.8-2.116.7-0.815.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.40.90.00.90.51.10.40.90.51.00.61.00.41.10.41.00.51.30.31.10.31.20.21.10.11.10.11.20.11.20.11.30.21.5-0.21.0-0.21.1-0.20.9-0.11.1-0.01.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo0.00.00.00.00.00.00.00.00.09.50.08.03.510.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss Attributable To Noncontrolling Interest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-4.43.8-0.8-0.4-6.34.1-0.80.4-2.21.31.42.11.72.31.1121.22.01.81.61.81.91.21.01.02.01.01.01.01.01.01.01.01.00.01.01.01.00.01.01.01.01.01.01.01.0
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.10.10.0-0.0-0.20.1-0.00.0-0.10.00.00.00.00.10.00.30.00.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest dei:LegalEntity

aep:SouthwesternElectricPowerCo


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value0.61.00.80.70.41.00.50.81.11.20.91.41.11.60.2110.61.00.81.11.11.10.6981.0130.9561.0330.8531.1091.1261.1020.8041.0581.0561.090.5230.9551.0611.0830.71.0231.0361.0820.8950.7741.273
Percentage of NetIncomeLossAttributableToNoncontrollingInterest-13.626.3-100.0-175.0-6.324.4-62.5200.0-50.092.364.366.764.769.618.291.750.050.044.468.861.157.958.2101.395.651.685.3110.9112.6110.280.4105.8105.6109.00.095.5106.1108.30.0102.3103.6108.289.577.4127.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo0.00.00.00.00.00.00.00.00.00.30.00.30.20.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest dei:LegalEntity, us-gaap:StatementEquityComponents

aep:SouthwesternElectricPowerCo, us-gaap:NoncontrollingInterest


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value0.61.00.70.41.00.81.11.20.91.41.11.60.2110.61.00.81.11.11.10.6981.0130.9561.0330.8531.1091.1261.1020.8041.0581.0561.090.5230.9551.0611.0830.7
Percentage of NetIncomeLossAttributableToNoncontrollingInterest-13.626.3-175.0-6.324.4200.0-50.092.364.366.764.769.618.291.750.050.044.468.861.157.958.2101.395.651.685.3110.9112.6110.280.4105.8105.6109.00.095.5106.1108.30.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.00.00.00.00.00.00.00.00.00.00.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value-4.43.8-0.4-6.34.10.4-2.21.31.42.11.72.31.1121.22.01.81.61.81.91.21.01.02.01.01.01.01.01.01.01.01.00.01.01.01.00.01.01.01.0
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.10.1-0.0-0.20.10.0-0.10.00.00.00.00.10.00.30.00.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss Available To Common Stockholders Basic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value578575435748520495153733461572363577528454400544375592373-765.850250146951943062919149339056034643333836321487362389308928352353176555136344238443316360
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax15.113.40.018.414.913.24.217.012.914.19.613.313.011.310.513.310.515.19.9-16.512.912.413.011.710.913.44.711.59.612.09.210.49.49.50.611.710.210.78.921.49.89.55.113.74.09.67.312.59.910.4

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic dei:LegalEntity

aep:SouthwesternElectricPowerCo


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value366219875815141106.2279.688371110732416158343237.013815845137331211036.862291021885335-4.6748649286.2598025
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic6.410.94.411.711.33.09.215.11.34.92.615.37.12.62.713.46.52.84.2-10.98.64.71.515.613.67.37.014.98.13.929.91.68.62.9102.318.114.99.1-1.59.314.28.13.614.618.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.01.50.02.21.70.40.42.60.20.70.32.00.90.30.31.80.70.40.41.81.10.60.21.81.51.00.31.70.80.52.70.20.80.30.62.11.51.0-0.12.01.40.80.22.00.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo0.00.00.00.00.00.00.00.00.06.50.016.58.32.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic dei:LegalEntity, us-gaap:StatementEquityComponents

aep:SouthwesternElectricPowerCo, us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302015-09-30
Value36628758151106.2279.68837111073158381
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic6.410.911.711.33.015.11.34.92.615.37.12.62.713.44.2-10.915.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.01.52.21.70.42.60.20.70.32.00.90.30.31.80.41.81.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302015-09-30
Value578575748520495733461572363577528454400544373-765.8518
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.099.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax15.113.418.414.913.217.012.914.19.613.313.011.310.513.39.9-16.511.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Operating Expenses

us-gaap:OperatingExpenses

us-gaap:OperatingExpenses


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3016347030403123277129953321335630223268325036643256334230683118283128363214578030263152314834723133358435273377327736073095330130353071336432442810287131013443289228982948303929662811
Percentage of OperatingExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax78.881.10.076.879.379.991.977.884.680.685.584.680.382.880.576.079.272.184.8124.277.777.987.178.379.576.187.678.581.077.682.079.084.780.393.178.179.179.290.079.580.177.785.874.888.378.8

us-gaap:OperatingExpenses dei:LegalEntity

aep:AEPTexasInc.


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value269275284311318334387371399319317339302289274302280261
Percentage of OperatingExpenses8.97.99.410.011.511.211.711.113.29.89.89.39.38.78.99.79.99.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax7.16.40.07.79.18.910.78.611.27.98.47.87.47.27.27.47.86.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTexasInc.0.00.00.00.00.00.00.00.00.090.90.083.381.581.80.00.00.00.0

aep:AEPTransmissionCo


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value1601531561421321331291171051019897898076726462594845
Percentage of OperatingExpenses5.34.45.14.64.84.53.93.53.53.13.02.72.82.42.52.32.32.21.80.81.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax4.23.60.03.53.83.63.62.73.02.52.62.22.22.02.01.81.81.61.61.11.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTransmissionCo0.00.00.00.00.00.00.00.00.041.60.047.147.338.40.00.00.00.00.00.00.0

aep:AppalachianPowerCo


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value556643560583517578694612578640610712534627571546547572593573515575521569536625627579583693767702654786748721573636661735662715702728694
Percentage of OperatingExpenses18.418.518.418.718.719.320.918.319.219.618.819.416.418.818.617.519.320.218.59.917.018.316.616.417.117.517.817.217.819.224.821.321.625.622.322.220.422.221.321.422.924.723.824.023.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax14.515.00.014.414.815.419.214.216.215.816.016.413.215.515.013.315.314.615.712.313.214.214.412.913.613.315.613.514.414.920.316.818.320.620.717.416.117.619.217.018.419.220.517.920.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AppalachianPowerCo0.00.00.00.00.00.00.00.00.081.30.093.278.575.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:IndianaMichiganPowerCo


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value510474481486457453497503465499522519472479451442432441475466427416436464452461491480476495534536471502518517446469500510457464495492467
Percentage of OperatingExpenses16.913.715.815.616.515.115.015.015.415.316.114.214.514.314.714.215.315.614.88.114.113.213.913.414.512.913.914.214.513.717.316.315.616.415.416.015.916.416.114.815.816.016.816.215.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax13.311.10.012.013.112.113.811.713.012.313.712.011.611.911.810.812.111.212.510.011.010.312.110.511.59.812.211.211.810.714.212.813.213.114.412.512.613.014.511.812.712.514.412.113.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:IndianaMichiganPowerCo0.00.00.00.00.00.00.00.00.080.60.083.978.183.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:OhioPowerCo


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value595625593643525582580612529674627698644673586587544595523699592629641641609795772734672764984966102998812991080903967244583663610942232665632
Percentage of OperatingExpenses19.718.019.520.619.019.517.518.217.520.619.319.119.820.219.118.819.221.016.312.119.620.020.418.519.422.221.921.820.521.231.829.333.932.238.633.332.233.778.824.322.037.875.721.921.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax15.614.60.015.815.015.616.114.214.816.616.516.115.916.715.414.315.215.113.815.015.215.617.814.515.516.919.217.116.616.426.123.128.825.836.026.025.526.771.019.317.629.465.016.418.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:OhioPowerCo0.00.00.00.00.00.00.00.00.081.40.094.384.686.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:PublicServiceCoOfOklahoma


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value290286256289249294306373291311327402341332314356298283268303241238274335264271287329269276274315266228220266248267254354264249266321288
Percentage of OperatingExpenses9.68.38.49.39.09.89.211.19.69.510.111.010.510.010.211.410.510.08.35.28.07.68.79.78.47.68.19.88.27.78.99.68.87.46.58.28.89.38.210.39.18.69.010.69.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax7.66.70.07.17.17.98.58.68.27.78.69.38.48.28.38.78.37.27.16.56.25.97.67.66.75.87.17.76.75.97.37.57.46.06.16.47.07.47.48.27.36.77.87.98.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:PublicServiceCoOfOklahoma0.00.00.00.00.00.00.00.00.093.40.084.186.999.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:SouthwesternElectricPowerCo


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value362523379395322350374410342367371408386377394380349347365392341327353391327339378398370375264500343343325365317293369406319308304352317
Percentage of OperatingExpenses12.015.112.512.711.611.711.312.211.311.211.411.111.911.312.912.212.312.311.46.811.310.411.211.310.59.510.711.811.310.48.515.211.311.29.711.311.310.211.911.811.010.610.311.610.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax9.512.20.09.79.29.410.49.59.69.09.89.49.59.410.39.39.88.89.78.48.88.19.88.88.37.29.49.39.28.17.012.09.69.09.08.89.08.110.79.48.98.38.98.79.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo0.00.00.00.00.00.00.00.00.086.10.076.285.190.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value8098105709437227512949585517885516687577067429867441097575-1127.9866892466960809112449992576710416788755477552499127417543438907178324861025394758481858682750
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax21.218.90.023.220.720.18.122.215.419.414.515.418.717.519.524.020.827.915.2-24.222.322.112.921.720.523.912.421.519.022.418.021.015.319.76.921.920.920.810.020.519.922.314.225.211.721.214.724.221.321.7

us-gaap:OperatingIncomeLoss dei:LegalEntity

aep:AEPTexasInc.


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value128897712082894.311838708494868197129109838111210382
Percentage of OperatingIncomeLoss15.911.013.612.811.411.81.512.37.09.015.314.111.411.613.113.114.77.614.1-10.011.99.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.42.10.03.02.42.40.12.71.11.72.22.22.12.02.53.23.12.12.12.42.72.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTexasInc.0.00.00.00.00.00.00.00.00.020.10.023.123.223.10.00.00.00.00.00.00.00.0

aep:AEPTransmissionCo


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value205208151161106162122142161141919794112969516590607610834
Percentage of OperatingIncomeLoss25.325.726.617.114.721.641.514.929.218.016.614.512.415.913.19.622.28.210.6-6.812.53.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax5.44.90.04.03.04.33.43.34.53.52.42.22.32.82.52.34.62.31.61.62.80.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTransmissionCo0.00.00.00.00.00.00.00.00.057.70.046.949.653.50.00.00.00.00.00.00.00.0

aep:AppalachianPowerCo


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value12017311315111917125142761521084913219317417312722013620415824413315714527310713011022010114792164142142143169102122881161011129.033
Percentage of OperatingIncomeLoss14.921.519.916.116.622.88.714.914.019.319.67.417.527.323.617.517.120.123.6-18.118.327.428.716.518.024.321.514.114.421.115.016.916.821.857.115.619.422.429.813.812.413.921.010.92.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.14.10.03.73.44.60.73.32.23.72.81.13.34.84.64.23.65.63.64.44.16.03.73.63.75.82.73.02.74.72.73.52.64.33.93.44.04.73.02.82.53.13.02.80.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AppalachianPowerCo0.00.00.00.00.00.00.00.00.019.30.06.519.523.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:IndianaMichiganPowerCo


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value7390561008911640107771155211011797841153511839131941155010391124396257146601027781268064762010064952911542
Percentage of OperatingIncomeLoss9.011.19.910.712.415.513.811.214.114.69.516.515.513.811.411.74.710.86.9-11.610.913.010.910.811.311.17.96.87.414.09.011.714.210.810.58.88.710.16.111.39.011.56.011.310.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.92.10.02.52.63.11.12.52.22.81.42.52.92.42.22.81.03.01.02.82.42.91.42.32.32.61.01.51.43.11.62.52.22.10.71.91.82.10.62.31.82.60.82.91.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:IndianaMichiganPowerCo0.00.00.00.00.00.00.00.00.018.60.017.819.416.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:OhioPowerCo


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1099884971141076398771621187910411714515411915064171138134100140961229910411411516231273244-81.785279210269637014329958319089
Percentage of OperatingIncomeLoss13.612.214.710.315.914.321.410.314.020.621.412.013.816.619.615.716.113.711.2-15.216.015.021.514.711.910.919.911.314.911.124.035.713.432.4-32.830.628.335.818.57.920.036.0120.118.522.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.92.30.02.43.32.91.72.32.24.03.11.82.62.93.83.83.33.81.73.73.63.32.83.22.42.62.52.42.82.54.37.52.06.4-2.36.75.97.41.81.64.08.017.04.72.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:OhioPowerCo0.00.00.00.00.00.00.00.00.019.60.010.813.715.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:PublicServiceCoOfOklahoma


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value549.32192592.41.812056202.978573.9218646205.59859351884553427874825239558332110669333410364381510439
Percentage of OperatingIncomeLoss6.71.13.79.88.20.30.612.510.32.70.511.77.60.62.98.86.21.91.0-8.76.84.03.98.86.93.15.59.56.42.43.411.010.74.48.811.69.44.410.211.69.04.73.210.210.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.40.20.02.31.70.10.02.81.60.50.11.81.40.10.62.11.30.50.12.11.50.90.51.91.40.70.72.01.20.50.62.31.60.90.62.62.00.91.02.41.81.00.42.61.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:PublicServiceCoOfOklahoma0.00.00.00.00.00.00.00.00.06.30.016.414.61.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:SouthwesternElectricPowerCo


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value68924012192353313433543812770414213775533614785512514111092451337864163527750271207255-12.73112880543312843
Percentage of OperatingIncomeLoss8.411.47.212.912.84.711.514.16.06.97.019.09.35.95.713.910.14.96.3-13.19.95.85.514.713.68.29.214.410.36.224.26.014.16.711.113.29.87.3-3.714.411.26.66.912.511.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.82.20.03.02.70.90.93.10.91.31.02.91.71.01.13.32.11.41.03.22.21.30.73.22.82.01.13.11.91.44.31.32.21.30.82.92.11.5-0.43.02.21.51.03.21.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo0.00.00.00.00.00.00.00.00.012.70.023.715.59.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Other Comprehensive Income Loss Net Of Tax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value12754503743-68.84042-80.0-30.3-34.48.80.61.3107-13.89.4-14.7-10.5-27.915-6.7-19.0-7.01.0-5.02.0-1.05.06.01867.0-7.03111721-3.0-2.0-90.0-18.0
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.31.30.00.91.2-1.81.11.0-2.2-0.7-0.90.20.00.02.8-0.30.3-0.4-0.3-0.60.4-0.2-0.5-0.20.0-0.10.0-0.00.10.14.90.2-0.20.83.20.5-0.1-0.1-2.6-0.4

us-gaap:OtherComprehensiveIncomeLossNetOfTax dei:LegalEntity

aep:AEPTexasInc.


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.30.33.00.30.30.31.40.30.30.3-0.70.30.30.31.40.30.30.3
Percentage of OtherComprehensiveIncomeLossNetOfTax0.20.66.00.80.7-0.43.50.7-0.4-1.02.03.450.023.11.3-2.23.2-2.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.00.00.00.00.00.00.0-0.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTexasInc.0.00.00.00.00.00.00.00.00.00.10.00.10.10.10.00.00.00.0

aep:AppalachianPowerCo


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value-1.27.99.4-0.3-1.8-5.112-0.9-0.9-0.8-3.6-1.0-1.0-1.011-0.4-0.5-0.5-4.0-0.5-0.6-0.5-6.335-0.68-0.456-0.3292.498-0.163-0.167-0.087300.3810.4471.616242.6181.4650.361-13.6190.334
Percentage of OtherComprehensiveIncomeLossNetOfTax-0.914.518.7-0.8-4.17.431.3-2.11.12.610.5-11.4-166.7-76.910.32.9-5.33.438.11.8-3.87.533.39.7-45.66.6124.916.3-3.3-1.416.35.4-6.45.220.712.5-48.8-18.115.1-1.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.00.20.0-0.0-0.1-0.10.3-0.0-0.0-0.0-0.1-0.0-0.0-0.00.3-0.0-0.0-0.0-0.1-0.0-0.0-0.0-0.2-0.0-0.0-0.00.1-0.0-0.0-0.00.80.00.00.00.70.10.00.0-0.40.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AppalachianPowerCo0.00.00.00.00.00.00.00.00.0-0.10.0-0.1-0.1-0.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:IndianaMichiganPowerCo


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value0.30.53.50.30.40.41.10.40.30.4-0.20.30.50.43.10.30.40.3-0.50.30.30.4-3.2350.2780.2780.279-0.1640.4520.3930.4689.1610.4180.4963.2993.884-0.126-7.1552.735-4.211-4.653
Percentage of OtherComprehensiveIncomeLossNetOfTax0.20.97.00.80.9-0.62.70.9-0.4-1.30.63.483.330.82.9-2.24.3-2.04.8-1.11.9-6.017.0-4.027.8-5.6-8.2-45.27.97.84.96.0-7.110.63.3-0.6238.5-136.84.725.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.00.00.00.00.00.00.0-0.00.00.00.00.10.00.00.0-0.00.00.00.0-0.10.00.00.0-0.00.00.00.00.20.00.00.10.1-0.0-0.20.1-0.1-0.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:IndianaMichiganPowerCo0.00.00.00.00.00.00.00.00.00.10.00.00.10.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:PublicServiceCoOfOklahoma


Other
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value-0.1-0.3-0.3-0.2-0.2-0.3-0.2-0.3-0.2-0.3-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.231-0.189-0.19-0.19-0.189-0.19-0.19-0.246-0.13-0.172-0.254-0.167-0.203-0.053-0.359-0.053-0.157
Percentage of OtherComprehensiveIncomeLossNetOfTax-0.2-0.8-0.70.3-0.50.40.70.9-2.3-50.0-15.4-0.21.4-2.11.41.90.7-1.33.01.22.7-19.03.8-9.419.0-3.8-4.1-0.1-2.53.6-0.5-0.2-0.312.02.60.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:PublicServiceCoOfOklahoma0.00.00.00.00.00.0-0.10.0-0.0-0.1-0.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OtherComprehensiveIncomeLossNetOfTax dei:LegalEntity, us-gaap:DerivativeInstrumentRisk, us-gaap:StatementEquityComponents

aep:AEPTexasInc., aep:InterestRate, us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.20.30.30.30.20.30.20.30.20.30.20.30.30.20.20.20.30.2
Percentage of OtherComprehensiveIncomeLossNetOfTax0.20.60.60.80.5-0.40.50.7-0.2-1.0-0.63.450.015.40.2-1.43.2-1.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTexasInc. aep:InterestRate us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:AppalachianPowerCo, aep:InterestRate, us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value-0.29.02.70.6-0.8-4.2-0.2-0.3-0.2-0.2-0.2-0.3-0.2-0.2-0.2-0.1-0.2-0.2-0.1-0.2-0.2-0.2
Percentage of OtherComprehensiveIncomeLossNetOfTax-0.216.65.41.6-1.86.1-0.5-0.70.20.70.6-3.4-33.3-15.4-0.20.7-2.11.41.00.7-1.33.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.00.20.00.0-0.0-0.1-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AppalachianPowerCo aep:InterestRate us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:IndianaMichiganPowerCo, aep:InterestRate, us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value0.40.50.40.40.40.40.40.40.40.40.40.30.50.40.30.30.40.30.30.30.30.4
Percentage of OtherComprehensiveIncomeLossNetOfTax0.30.90.81.10.9-0.61.00.9-0.5-1.3-1.23.483.330.80.3-2.24.3-2.0-2.9-1.11.9-6.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:IndianaMichiganPowerCo aep:InterestRate us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:PublicServiceCoOfOklahoma, aep:InterestRate, us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value0.0-0.1-0.2-0.3-0.3-0.2-0.3-0.2-0.3-0.2-0.3-0.2-0.3-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2
Percentage of OtherComprehensiveIncomeLossNetOfTax0.0-0.2-0.4-0.8-0.70.3-0.7-0.50.40.70.9-2.3-50.0-15.4-0.21.4-2.11.41.90.7-1.33.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.0-0.00.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:PublicServiceCoOfOklahoma aep:InterestRate us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:SouthwesternElectricPowerCo, aep:InterestRate, us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value0.40.40.40.40.30.40.40.30.40.40.42.70.50.40.30.40.20.50.40.40.40.5
Percentage of OtherComprehensiveIncomeLossNetOfTax0.30.70.81.10.7-0.61.00.7-0.5-1.3-1.230.783.330.80.3-2.92.1-3.4-3.8-1.42.5-7.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.00.00.00.00.00.00.00.00.10.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo aep:InterestRate us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OtherComprehensiveIncomeLossNetOfTax dei:LegalEntity, us-gaap:StatementEquityComponents

aep:AEPTexasInc., us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Other
Period End2021-06-302020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value0.10.00.10.00.00.10.00.00.00.10.10.00.1
Percentage of OtherComprehensiveIncomeLossNetOfTax0.10.00.2-0.00.0-0.1-0.00.00.07.7-0.70.0-0.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTexasInc. us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:AEPTexasInc., us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.30.30.30.30.30.30.30.3-0.70.30.30.31.40.30.30.3
Percentage of OtherComprehensiveIncomeLossNetOfTax0.20.60.80.7-0.40.7-0.4-1.02.03.450.023.11.3-2.23.2-2.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.00.00.00.00.0-0.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTexasInc. us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:AppalachianPowerCo, us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-31
Value-1.0-1.1-0.9-1.0-0.9-0.6-0.7-0.6-0.7-0.8-0.8-0.3-0.3-0.3-0.3-0.4-0.3-0.458-0.458-0.458-0.333-0.333-0.3330.3590.3580.358
Percentage of OtherComprehensiveIncomeLossNetOfTax-0.8-2.0-2.4-2.31.3-1.40.92.0-8.0-133.3-61.52.2-3.22.01.1-2.54.56.5-45.89.233.3-6.7-5.55.1-5.11.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AppalachianPowerCo us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:AppalachianPowerCo, us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value-1.27.9-0.3-1.8-5.1-0.9-0.9-0.8-3.6-1.0-1.0-1.011-0.4-0.5-0.5-4.0-0.5-0.6-0.5-6.335-0.68-0.456-0.3292.498-0.163-0.167-0.087300.3810.4471.616242.6181.4650.361-13.619
Percentage of OtherComprehensiveIncomeLossNetOfTax-0.914.5-0.8-4.17.4-2.11.12.610.5-11.4-166.7-76.910.32.9-5.33.438.11.8-3.87.533.39.7-45.66.6124.916.3-3.3-1.416.35.4-6.45.220.712.5-48.8-18.115.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.00.2-0.0-0.1-0.1-0.0-0.0-0.0-0.1-0.0-0.0-0.00.3-0.0-0.0-0.0-0.1-0.0-0.0-0.0-0.2-0.0-0.0-0.00.1-0.0-0.0-0.00.80.00.00.00.70.10.00.0-0.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AppalachianPowerCo us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:IndianaMichiganPowerCo, us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Other
Period End2021-06-302020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-31
Value-0.1-0.10.00.00.0-0.10.00.00.00.00.00.00.00.00.00.00.0110.010.0120.0420.0430.0430.1740.1750.176
Percentage of OtherComprehensiveIncomeLossNetOfTax-0.1-0.30.0-0.00.00.1-0.00.00.00.0-0.00.0-0.0-0.00.0-0.0-0.21.0-0.2-4.20.90.72.5-2.50.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.0-0.00.00.00.0-0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:IndianaMichiganPowerCo us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:IndianaMichiganPowerCo, us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value0.30.50.30.40.40.40.30.4-0.20.30.50.43.10.30.40.3-0.50.30.30.4-3.2350.2780.2780.279-0.1130.4520.3930.4689.1610.4180.4963.2993.884-0.126-7.1552.735-4.211
Percentage of OtherComprehensiveIncomeLossNetOfTax0.20.90.80.9-0.60.9-0.4-1.30.63.483.330.82.9-2.24.3-2.04.8-1.11.9-6.017.0-4.027.8-5.6-5.7-45.27.97.84.96.0-7.110.63.3-0.6238.5-136.84.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.00.00.00.00.0-0.00.00.00.00.10.00.00.0-0.00.00.00.0-0.10.00.00.0-0.00.00.00.00.20.00.00.10.1-0.0-0.20.1-0.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:IndianaMichiganPowerCo us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:PublicServiceCoOfOklahoma, us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value-0.1-0.3-0.3-0.2-0.2-0.3-0.2-0.3-0.2-0.3-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.231-0.189-0.19-0.19-0.189-0.19-0.19-0.246-0.13-0.172-0.254-0.167-0.203-0.053-0.359-0.053-0.157
Percentage of OtherComprehensiveIncomeLossNetOfTax-0.2-0.8-0.70.3-0.50.40.70.9-2.3-50.0-15.4-0.21.4-2.11.41.90.7-1.33.01.22.7-19.03.8-9.419.0-3.8-4.1-0.1-2.53.6-0.5-0.2-0.312.02.60.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:PublicServiceCoOfOklahoma us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:SouthwesternElectricPowerCo, us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-31
Value-0.4-0.4-0.4-0.3-0.4-0.3-0.3-0.3-0.3-0.4-0.3-0.2-0.1-0.2-0.1-0.2-0.2-0.24-0.239-0.24-0.235-0.235-0.234-0.064-0.064-0.063
Percentage of OtherComprehensiveIncomeLossNetOfTax-0.3-0.7-1.1-0.70.6-0.70.41.0-3.4-66.7-23.11.4-1.11.40.4-1.33.03.4-23.94.823.5-4.7-3.9-0.90.9-0.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:DerivativeInstrumentRisk, us-gaap:StatementEquityComponents

aep:InterestRate, us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value1.1144.83.0-1.8-42.05.2-0.8-3.50.20.12.60.20.2-0.8-1.84.90.40.40.40.40.3
Percentage of OtherComprehensiveIncomeLossNetOfTax0.926.29.58.0-4.161.012.9-1.94.4-0.7-0.329.533.315.4-0.713.052.1-2.7-3.8-1.42.5-4.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.30.00.1-0.1-1.10.1-0.0-0.10.00.00.10.00.0-0.0-0.00.10.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:InterestRate us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommodityContract, us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value12842-15.53647-25.0-21.345-75.1-29.1-0.27.61.62.520-13.23.6-16.54.0-29.014-7.75.2-6.01.0-7.0-2.0-3.02.04.01.0-2.0-11.020
Percentage of OtherComprehensiveIncomeLossNetOfTax100.877.5-30.896.8108.036.3-53.0105.193.996.00.686.4266.7192.319.395.738.3112.2-38.1103.993.1114.9-27.485.7100.0140.0-100.0300.040.066.70.5-28.6157.164.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.41.00.00.91.3-0.7-0.61.0-2.1-0.7-0.00.20.00.10.5-0.30.1-0.40.1-0.60.4-0.20.1-0.10.0-0.1-0.0-0.10.00.10.0-0.0-0.30.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:CommodityContract us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-31
Value-2.1-2.0-1.8-1.7-1.8-1.4-1.4-1.4-1.4-1.2-1.40.30.30.20.20.10.10.01.00.01.01.01.07.03.06.0
Percentage of OtherComprehensiveIncomeLossNetOfTax-1.6-3.7-4.8-3.92.6-3.31.84.6-15.9-200.0-107.7-2.23.2-1.4-0.70.6-1.5-0.0100.0-0.0-100.020.016.7100.0-42.919.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.1-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.00.00.00.00.00.00.00.00.00.00.00.00.00.20.10.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-31
Value127543743-68.842-80.0-30.3-34.48.80.61.3107-13.89.4-14.7-10.5-27.915-6.7-19.0-7.01.0-5.02.0-1.05.06.01867.0-7.03111721-3.0-2.0-90.0
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.31.30.91.2-1.81.0-2.2-0.7-0.90.20.00.02.8-0.30.3-0.4-0.3-0.60.4-0.2-0.5-0.20.0-0.10.0-0.00.10.14.90.2-0.20.83.20.5-0.1-0.1-2.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:OtherNonoperatingIncomeExpense


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3321415.514-4.48.23.26.68.6-0.36.36.75.5
Percentage of OtherNonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.90.50.00.10.4-0.10.20.10.20.2-0.00.10.20.1

us-gaap:OtherNonoperatingIncomeExpense dei:LegalEntity

aep:IndianaMichiganPowerCo


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312012-09-302012-06-302011-09-302011-06-302010-09-302010-06-30
Value3.43.02.22.23.12.52.93.56.15.73.86.14.94.42.0492.8483.9443.4674.0225.601
Percentage of OtherNonoperatingIncomeExpense10.313.85.340.021.7-56.835.4109.492.466.3-1266.796.873.180.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.10.10.00.10.10.10.10.10.20.10.10.10.10.10.00.10.10.10.10.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:IndianaMichiganPowerCo0.00.00.00.00.00.00.00.00.00.90.01.00.80.80.00.00.00.00.00.0

Profit Loss

us-gaap:ProfitLoss

us-gaap:ProfitLoss


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value573578434748514499152733459574364579530456401556376594375-764.250350347052043163119249439156134743433936421488363390311930353355178557137346239446317363
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax15.013.50.018.414.713.34.217.012.814.29.613.413.111.310.513.610.515.19.9-16.412.912.413.011.710.913.44.811.59.712.19.210.49.59.50.611.710.210.89.021.59.89.55.213.74.19.77.312.69.910.5

us-gaap:ProfitLoss dei:LegalEntity

aep:AEPTexasInc.


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value794643826647-13.777803460574646163644933558.14933
Percentage of ProfitLoss13.98.010.111.013.09.5-9.010.517.66.016.510.08.810.240.811.613.05.614.9-1.19.76.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.11.10.02.01.91.3-0.41.82.30.81.61.31.11.24.31.61.40.81.50.21.30.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTexasInc.0.00.00.00.00.00.00.00.00.09.80.014.212.513.20.00.00.00.00.00.00.00.0

aep:AEPTransmissionCo


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value14815111411773117911071361047178708561591075739527425
Percentage of ProfitLoss25.926.226.315.714.323.660.114.729.618.219.713.513.318.815.410.828.59.610.6-6.914.85.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.93.50.02.92.13.12.52.53.82.61.91.81.72.11.61.53.01.41.01.11.90.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTransmissionCo0.00.00.00.00.00.00.00.00.042.50.037.837.140.80.00.00.00.00.00.00.00.0

aep:AppalachianPowerCo


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value661225611681115121045513377877712582865211065104731266574591412848361013062297056636275395231383550-19.619
Percentage of ProfitLoss11.621.213.015.615.823.18.414.212.123.321.315.014.627.520.615.413.818.617.4-13.614.625.113.914.313.722.514.99.99.318.28.714.48.819.4269.912.917.219.312.75.79.011.020.29.0-14.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.72.90.02.92.33.10.42.41.63.32.02.01.93.12.22.11.52.81.72.21.93.11.81.71.53.00.71.10.92.20.81.50.81.81.61.51.82.11.11.20.91.01.01.2-0.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AppalachianPowerCo0.00.00.00.00.00.00.00.00.017.00.011.411.415.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:IndianaMichiganPowerCo


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value5770527663922188609829729464426410683875517424565072142627873557404310392939215131454.1316214
Percentage of ProfitLoss10.012.212.010.312.418.514.012.113.117.28.112.517.914.110.711.72.811.510.3-9.910.214.85.310.911.711.57.65.47.015.510.213.312.011.948.48.08.210.16.85.68.912.82.311.210.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.51.70.01.91.82.50.62.11.72.40.81.72.31.61.11.60.31.71.01.61.31.80.71.31.31.50.40.60.71.90.91.41.11.10.30.90.81.10.61.20.91.20.11.50.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:IndianaMichiganPowerCo0.00.00.00.00.00.00.00.00.016.00.011.715.711.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:OhioPowerCo


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value74685659807549695012888886879928262863799747048714765455456608017821129-60.22915110115028467516531110037
Percentage of ProfitLoss12.911.813.07.915.715.032.49.411.022.324.215.313.017.423.114.816.614.510.0-13.114.814.010.213.811.110.423.510.914.510.823.141.26.235.7-286.831.027.938.79.25.021.446.8174.918.127.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.91.60.01.52.32.01.41.61.43.22.32.01.72.02.42.01.72.21.02.11.91.71.31.61.21.41.11.31.41.32.14.30.63.4-1.73.62.94.20.81.12.14.49.12.51.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:OhioPowerCo0.00.00.00.00.00.00.00.00.015.50.012.09.010.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:PublicServiceCoOfOklahoma


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value46-2.76.68046-10.3-10.8100416.2-6.66036-7.20.646204.82.65228157.04427131045228.4484.5755128138.17958351220573115-2.2735515
Percentage of ProfitLoss8.0-0.51.510.79.0-2.1-7.113.79.11.1-1.810.46.9-1.60.18.35.40.80.7-6.95.73.11.58.66.32.25.79.15.71.51.311.88.43.838.911.99.73.26.56.28.94.3-1.310.011.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.2-0.10.02.01.3-0.3-0.32.31.20.2-0.21.40.9-0.20.01.10.60.10.11.10.70.40.21.00.70.30.31.00.60.20.11.20.80.40.21.41.00.30.61.30.90.4-0.11.40.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:PublicServiceCoOfOklahoma0.00.00.00.00.00.00.00.00.01.90.012.69.3-2.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:SouthwesternElectricPowerCo


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value376319885916141117.3291089381311842517168444247.7825946147432221047.92301121895436-3.5678751297.2118126
Percentage of ProfitLoss6.511.04.611.811.53.29.615.21.65.12.915.57.32.92.715.16.72.94.4-11.08.84.91.615.813.87.47.415.18.44.130.01.88.93.2104.818.315.19.3-1.19.414.58.44.114.719.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.01.50.02.21.70.40.42.60.20.70.32.11.00.30.32.00.70.40.41.81.10.60.21.91.51.00.41.70.80.52.80.20.80.30.62.11.51.0-0.12.01.40.80.22.00.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo0.00.00.00.00.00.00.00.00.06.80.016.78.53.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ProfitLoss dei:LegalEntity, us-gaap:StatementBusinessSegments

aep:AEPTransmissionCo, aep:AEPTCoParent


Profit
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value0.10.00.10.50.50.30.30.40.10.41.0-0.3-0.1-224.0591070.2-153.65274
Percentage of ProfitLoss0.00.00.00.10.10.20.00.10.00.10.2-0.1-0.0-55.710.828.50.0-40.9-6.914.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.00.00.00.00.00.00.00.0-0.0-0.0-5.91.53.00.0-4.11.11.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTransmissionCo aep:AEPTCoParent0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:AEPTransmissionCo, aep:StateTranscos


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value148151114117731179110713510471777086615910756405274
Percentage of ProfitLoss25.926.226.315.714.223.559.914.629.518.219.513.313.418.815.410.728.59.610.7-6.814.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.93.50.02.92.13.12.52.53.82.61.91.81.72.11.61.53.01.41.11.11.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTransmissionCo aep:StateTranscos0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ProfitLoss dei:LegalEntity, us-gaap:StatementEquityComponents

aep:AEPTexasInc., us-gaap:RetainedEarnings


Profit
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value794682664777803460574646163644933
Percentage of ProfitLoss13.98.011.013.09.510.517.66.016.510.08.810.240.811.613.05.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.11.12.01.91.31.82.30.81.61.31.11.24.31.61.40.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTexasInc. us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:AEPTransmissionCo, us-gaap:RetainedEarnings


Profit
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value14815111773117107136104717882856159107573952
Percentage of ProfitLoss25.926.215.714.323.614.729.618.219.713.515.518.815.410.828.59.610.6-6.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.93.52.92.13.12.53.82.61.91.82.02.11.61.53.01.41.01.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTransmissionCo us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:AppalachianPowerCo, us-gaap:RetainedEarnings


Profit
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value66122116811151045513377877712582865211065104731266574591412848361013062297056636275395231383550
Percentage of ProfitLoss11.621.215.615.823.114.212.123.321.315.014.627.520.615.413.818.617.4-13.614.625.113.814.313.722.514.99.99.318.28.714.48.819.4269.912.917.219.312.75.79.011.020.29.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.72.92.92.33.12.41.63.32.02.01.93.12.22.11.52.81.72.21.93.11.81.71.53.00.71.10.92.20.81.50.81.81.61.51.82.11.11.20.91.01.01.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AppalachianPowerCo us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:IndianaMichiganPowerCo, us-gaap:RetainedEarnings


Profit
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value577076639288609829729464426410683875517424565072142627873557404310392939215131454.13162
Percentage of ProfitLoss10.012.210.312.418.512.113.117.28.112.517.914.110.711.72.811.510.3-9.910.214.85.310.911.711.57.65.47.015.510.213.312.011.948.48.08.210.16.85.68.912.82.311.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.51.71.91.82.52.11.72.40.81.72.31.61.11.60.31.71.01.61.31.80.71.31.31.50.40.60.71.90.91.41.11.10.30.90.81.10.61.20.91.20.11.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:IndianaMichiganPowerCo us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:OhioPowerCo, us-gaap:RetainedEarnings


Profit
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value7468598075695012888886879928262863799747048714765455456608017821129-60.2291511011502424610165311100
Percentage of ProfitLoss12.911.87.915.715.09.411.022.324.215.313.017.423.114.816.614.510.0-13.114.814.010.213.811.110.423.510.914.510.823.141.26.235.7-286.831.027.938.777.85.02.946.8174.918.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.91.61.52.32.01.61.43.22.32.01.72.02.42.01.72.21.02.11.91.71.31.61.21.41.11.31.41.32.14.30.63.4-1.73.62.94.27.01.10.34.49.12.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:OhioPowerCo us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:PublicServiceCoOfOklahoma, us-gaap:RetainedEarnings


Profit
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value46-2.78046-10.3100416.2-6.66036-7.20.646204.82.65228156.9784427131045228.4484.5755128138.17958351220573115-2.27355
Percentage of ProfitLoss8.0-0.510.79.0-2.113.79.11.1-1.810.46.9-1.60.18.35.40.80.7-6.95.73.11.58.66.32.25.79.15.71.51.311.88.43.838.911.99.73.26.56.28.94.3-1.310.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.2-0.12.01.3-0.32.31.20.2-0.21.40.9-0.20.01.10.60.10.11.10.70.40.21.00.70.30.31.00.60.20.11.20.80.40.21.41.00.30.61.30.90.4-0.11.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:PublicServiceCoOfOklahoma us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ProfitLoss us-gaap:StatementBusinessSegments

aep:GenerationAndMarketing


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value4638131145830-29.0885.239725.13818-80.3332618650-1369.249706.09182187-11.01179816340112-9.085
Percentage of ProfitLoss8.16.63.115.311.46.1-19.012.11.16.820.00.97.34.0-20.06.17.031.313.5179.29.914.11.317.519.029.6-5.723.725.129.111.525.8-2.723.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.20.90.02.81.70.8-0.82.10.11.01.90.11.00.4-2.10.80.74.71.3-29.41.31.70.22.12.14.0-0.32.72.43.51.12.7-0.32.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:GenerationAndMarketing0.00.00.00.00.00.00.00.00.00.00.00.08.43.70.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:TransmissionAndDistributionCompanies


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value15311493147139116291331311561421451141252621441111199415512410863113789776929097771197587
Percentage of ProfitLoss26.819.821.519.727.123.319.318.228.627.339.125.021.527.565.225.929.620.025.1-20.324.721.513.521.718.115.439.618.623.017.322.227.422.123.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax4.02.70.03.64.03.10.83.13.73.93.83.42.83.16.93.53.13.02.53.33.22.71.82.52.02.11.92.12.22.12.02.82.12.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:TransmissionAndDistributionCompanies0.00.00.00.00.00.00.00.00.00.00.00.010.111.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:TransmissionOperations


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value1691731351399214111212715512592741011047776129725969954444466537374347242722181312148.09.0119.06.04.0
Percentage of ProfitLoss29.629.931.118.617.928.473.717.333.821.825.212.819.222.919.213.734.312.315.9-9.118.98.99.58.815.15.919.38.712.04.37.85.15.33.657.12.92.22.33.51.01.71.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax4.44.00.03.42.63.83.12.94.33.12.41.72.52.62.01.93.61.91.61.52.41.11.21.01.60.80.91.01.20.50.70.50.50.30.30.30.20.20.30.20.20.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:TransmissionOperations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:VerticallyIntegratedUtilities


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value2282711673942562466443817830313934527723216429712122015134321027811727520830058220155279173174153181
Percentage of ProfitLoss39.946.938.652.749.849.342.459.738.952.938.259.652.451.040.853.432.337.140.4-44.941.855.424.952.948.347.530.244.539.649.749.940.145.149.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax6.06.30.09.77.36.61.810.25.07.53.78.06.85.84.37.23.45.64.07.45.46.93.26.25.36.41.45.13.86.04.64.24.34.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:VerticallyIntegratedUtilities0.00.00.00.00.00.00.00.00.00.00.00.011.79.70.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AllOtherSegments


Profit
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value-24.8-18.425-47.3-32.0-35.3-25.0-53.9-11.7-50.4-82.29.6-2.3-24.4-21.45.2-11.8-4.41936231.0254-9.0-3.0-1.00.011-2.0-5.0240.0104-3.0-77.0-6.0-8.0-11.0-8.0-10.0-13.0-31.0-35.02.0-1.0
Percentage of ProfitLoss-4.3-3.25.8-6.3-6.2-7.1-16.4-7.3-2.5-8.8-22.51.7-0.4-5.3-5.30.9-3.1-0.75.1-4.84.70.254.1-1.7-0.7-0.20.02.2-0.5-0.96.90.030.7-0.8-366.7-1.2-2.2-2.8-2.6-1.1-3.7-8.7-19.70.4-0.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.6-0.40.0-1.2-0.9-0.9-0.7-1.2-0.3-1.2-2.20.2-0.1-0.6-0.60.1-0.3-0.10.50.80.60.07.0-0.2-0.1-0.00.00.3-0.0-0.10.60.02.9-0.1-2.1-0.1-0.2-0.3-0.2-0.2-0.4-0.8-1.00.0-0.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:AllOtherSegments0.00.00.00.00.00.00.00.00.00.00.00.0-10.8-110.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Revenue From Contract With Customer Including Assessed Tax

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value38264281361040663494374736164315357340563801433340574038381041043576393337904652389240443614443239424708402643024044464837734176358238263613415635513625344443333609373034344064336035693282354732023458
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenues

us-gaap:Revenues

us-gaap:Revenues


Revenues
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value38264281361040663494374736164315357340563801433340134048381041043576393337904652389240443614443239424708402643024044464837734176358238263613415635513625344443333609373034344064336035693282354732023458
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.098.9100.2100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Revenues dei:LegalEntity

aep:AEPTexasInc.


Revenuesdei:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value398364361432401423391489438390402433388371374431389343362403365330
Percentage of Revenues10.48.510.010.611.511.310.811.312.39.610.610.09.79.29.810.510.98.79.68.79.48.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax10.48.510.010.611.511.310.811.312.39.610.610.09.69.29.810.510.98.79.68.79.48.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTexasInc.0.00.00.00.00.00.00.00.00.0111.10.0106.4104.7104.90.00.00.00.00.00.00.00.0

aep:AEPTransmissionCo


Revenuesdei:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value36536130730423829525125926624318919418319317316722915212012515379
Percentage of Revenues9.68.48.57.56.87.96.96.07.56.05.04.54.64.84.64.16.43.93.22.73.92.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax9.68.48.57.56.87.96.96.07.56.05.04.54.54.84.64.16.43.93.22.73.92.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTransmissionCo0.00.00.00.00.00.00.00.00.099.30.094.096.891.90.00.00.00.00.00.00.00.0

aep:AppalachianPowerCo


Revenuesdei:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value677817673735637749720755655792718762667820746719675792729778673820655727681899735709694913869849746951890864716805763858751831804840703
Percentage of Revenues17.719.118.718.118.220.019.917.518.419.518.917.616.620.319.617.518.920.219.216.717.320.318.116.417.319.118.316.517.219.723.020.320.824.924.720.820.222.222.219.820.822.323.420.720.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax17.719.118.718.118.220.019.917.518.419.518.917.616.420.319.617.518.920.219.216.717.320.318.116.417.319.118.316.517.219.723.020.320.824.924.720.820.222.222.219.820.822.323.420.720.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AppalachianPowerCo0.00.00.00.00.00.00.00.00.0100.60.099.798.099.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:IndianaMichiganPowerCo


Revenuesdei:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value583564538586546570538611543614574629589576535557467560514597522532487568544586531542533641595638549583544598510546521611521560524608509
Percentage of Revenues15.313.214.914.415.615.214.914.215.215.115.114.514.714.214.113.613.114.313.612.813.413.213.512.813.812.513.212.613.213.815.815.315.315.215.114.414.415.115.114.114.415.015.315.015.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax15.313.214.914.415.615.214.914.215.215.115.114.514.514.314.113.613.114.313.612.813.413.213.512.813.812.513.212.613.213.815.815.315.315.215.114.414.415.115.114.114.415.015.315.015.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:IndianaMichiganPowerCo0.00.00.00.00.00.00.00.00.099.20.0101.697.6100.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:OhioPowerCo


Revenuesdei:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value70472367774164069064371060683674577874879073174266374658887173076369278270591887183978688011461279110212331217135911131237121190777913942816855721
Percentage of Revenues18.416.918.818.218.318.417.816.517.020.619.618.018.719.519.218.118.619.015.518.718.818.919.117.717.919.521.619.519.418.930.430.630.832.233.732.731.434.135.220.921.637.482.021.121.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax18.416.918.818.218.318.417.816.517.020.619.618.018.519.619.218.118.619.015.518.718.818.919.117.717.919.521.619.519.418.930.430.630.832.233.732.731.434.135.220.921.637.482.021.121.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:OhioPowerCo0.00.00.00.00.00.00.00.00.0101.10.0105.098.4101.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:PublicServiceCoOfOklahoma


Revenuesdei:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value344296278382308297307493348332330481398336335442344304273401300274292420319306314416318301297411324262242372317300289457328288281426327
Percentage of Revenues9.06.97.79.48.87.98.511.49.78.28.711.19.98.38.810.89.67.77.28.67.76.88.19.58.16.57.89.77.96.57.99.89.16.96.79.08.98.38.410.69.17.78.210.59.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax9.06.97.79.48.87.98.511.49.78.28.711.19.88.38.810.89.67.77.28.67.76.88.19.58.16.57.89.77.96.57.99.89.16.96.79.08.98.38.410.69.17.78.210.59.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:PublicServiceCoOfOklahoma0.00.00.00.00.00.00.00.00.099.60.0100.5101.4101.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:SouthwesternElectricPowerCo


Revenuesdei:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value430616420517415385408545375421410535457419436517424401402539427379378532438431424531449440428552420394352485390348356534399362338480361
Percentage of Revenues11.214.411.612.711.910.311.312.610.510.410.812.411.410.411.512.611.910.210.611.611.09.410.512.011.19.210.612.411.19.511.413.211.710.39.811.711.09.610.312.311.19.79.911.810.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax11.214.411.612.711.910.311.312.610.510.410.812.411.310.411.512.611.910.210.611.611.09.410.512.011.19.210.612.411.19.511.413.211.710.39.811.711.09.610.312.311.19.79.911.810.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo0.00.00.00.00.00.00.00.00.098.80.099.9100.699.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Revenues dei:LegalEntity, us-gaap:ProductOrService

aep:AEPTexasInc., aep:Alternative


Revenuesdei:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3.4-0.73.7-0.71.1-0.71.0-0.71.2-0.9-0.2-1.00.2-0.3
Percentage of Revenues0.1-0.00.1-0.00.0-0.00.0-0.00.0-0.0-0.0-0.00.0-0.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.1-0.00.1-0.00.0-0.00.0-0.00.0-0.0-0.0-0.00.0-0.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTexasInc. aep:Alternative0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:AEPTexasInc., aep:AlternativeandOther


Revenuesdei:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3.4-0.74.33917293541423841261717
Percentage of Revenues0.1-0.00.11.00.50.81.01.01.21.01.10.60.40.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.1-0.00.11.00.50.81.01.01.21.01.10.60.40.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTexasInc. aep:AlternativeandOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:AEPTexasInc., aep:OtherRevenues


Revenuesdei:
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.64016303441413941270.00.0
Percentage of Revenues0.01.00.50.81.01.01.11.01.10.60.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.01.00.50.81.01.01.11.01.10.60.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTexasInc. aep:OtherRevenues0.08120.01463.63355.60.03483.35857.15685.70.01935.70.00.0

aep:AEPTransmissionCo, aep:Alternative


Revenuesdei:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2211-4.7-4.6-71.7-6.0-2.9-1.2-14.9-1.7-20.5-12.4-6.0-17.0
Percentage of Revenues0.60.3-0.1-0.1-2.1-0.2-0.1-0.0-0.4-0.0-0.5-0.3-0.1-0.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.60.3-0.1-0.1-2.1-0.2-0.1-0.0-0.4-0.0-0.5-0.3-0.1-0.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTransmissionCo aep:Alternative0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:AEPTransmissionCo, aep:AlternativeandOther


Revenuesdei:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2211-4.7-4.6-71.7-6.0-2.9-1.2-14.9-1.7-20.5-12.4-6.0-17.0
Percentage of Revenues0.60.3-0.1-0.1-2.1-0.2-0.1-0.0-0.4-0.0-0.5-0.3-0.1-0.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.60.3-0.1-0.1-2.1-0.2-0.1-0.0-0.4-0.0-0.5-0.3-0.1-0.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTransmissionCo aep:AlternativeandOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:AppalachianPowerCo, aep:Alternative


Revenuesdei:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value5.12.2-1.1-1.1-9.7-1.12.46.60.24.4-3.1-1.2-13.6-5.9
Percentage of Revenues0.10.1-0.0-0.0-0.3-0.00.10.20.00.1-0.1-0.0-0.3-0.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.10.1-0.0-0.0-0.3-0.00.10.20.00.1-0.1-0.0-0.3-0.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AppalachianPowerCo aep:Alternative0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:AppalachianPowerCo, aep:AlternativeandOther


Revenuesdei:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value4.92.4-1.1-1.1-9.7-1.12.46.60.24.4-4.1-2.1-13.6-5.9
Percentage of Revenues0.10.1-0.0-0.0-0.3-0.00.10.20.00.1-0.1-0.0-0.3-0.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.10.1-0.0-0.0-0.3-0.00.10.20.00.1-0.1-0.0-0.3-0.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AppalachianPowerCo aep:AlternativeandOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:AppalachianPowerCo, aep:OtherRevenues


Revenuesdei:
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-0.20.20.00.00.00.00.00.0-1.0-0.90.00.0
Percentage of Revenues-0.00.00.00.00.00.00.00.0-0.0-0.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.00.00.00.00.00.00.00.0-0.0-0.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AppalachianPowerCo aep:OtherRevenues-8.37.40.00.00.00.00.00.00.0-39.10.00.0

aep:IndianaMichiganPowerCo, aep:Alternative


Revenuesdei:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-0.8-1.10.40.44.60.40.0-1.14.5-4.81.91.5-0.5-5.0
Percentage of Revenues-0.0-0.00.00.00.10.00.0-0.00.1-0.10.00.0-0.0-0.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.0-0.00.00.00.10.00.0-0.00.1-0.10.00.0-0.0-0.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:IndianaMichiganPowerCo aep:Alternative0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:IndianaMichiganPowerCo, aep:AlternativeandOther


Revenuesdei:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-0.8-1.10.40.44.60.40.0-1.14.5-4.8-6.310-14.70.5
Percentage of Revenues-0.0-0.00.00.00.10.00.0-0.00.1-0.1-0.20.2-0.40.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.0-0.00.00.00.10.00.0-0.00.1-0.1-0.20.2-0.40.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:IndianaMichiganPowerCo aep:AlternativeandOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:OhioPowerCo, aep:Alternative


Revenuesdei:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value19171610.019209.7126.03.626-36.9-16.66.3
Percentage of Revenues0.50.40.50.20.60.50.30.30.20.10.7-0.9-0.40.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.50.40.50.20.60.50.30.30.20.10.7-0.9-0.40.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:OhioPowerCo aep:Alternative0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:OhioPowerCo, aep:AlternativeandOther


Revenuesdei:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value232321132326239.67.58.7-51.637-12.510
Percentage of Revenues0.60.50.60.30.70.70.60.20.20.2-1.40.9-0.30.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.60.50.60.30.70.70.60.20.20.2-1.40.9-0.30.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:OhioPowerCo aep:AlternativeandOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:OhioPowerCo, aep:OtherRevenues


Revenuesdei:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value4.05.34.23.43.86.113-2.81.55.1-78.074-0.80.8
Percentage of Revenues0.10.10.10.10.10.20.4-0.10.00.1-2.11.7-0.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.10.10.10.10.10.20.4-0.10.00.1-2.11.7-0.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:OhioPowerCo aep:OtherRevenues200.0220.80.0147.8165.2225.90.0-93.357.7182.10.03095.8-2.51.9

aep:PublicServiceCoOfOklahoma, aep:Alternative


Revenuesdei:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1.4-0.40.7-0.51.60.4-5.77.1-31.2-1.2-0.32.35.63.3
Percentage of Revenues0.0-0.00.0-0.00.00.0-0.20.2-0.9-0.0-0.00.10.10.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.0-0.00.0-0.00.00.0-0.20.2-0.9-0.0-0.00.10.10.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:PublicServiceCoOfOklahoma aep:Alternative0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:PublicServiceCoOfOklahoma, aep:AlternativeandOther


Revenuesdei:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1.4-0.40.7-0.51.60.4-5.77.1-31.2-1.2-0.32.35.63.3
Percentage of Revenues0.0-0.00.0-0.00.00.0-0.20.2-0.9-0.0-0.00.10.10.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.0-0.00.0-0.00.00.0-0.20.2-0.9-0.0-0.00.10.10.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:PublicServiceCoOfOklahoma aep:AlternativeandOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:SouthwesternElectricPowerCo, aep:Alternative


Revenuesdei:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value5.20.12.70.2-1.31.6-0.9-4.0-38.1-5.32.6-0.32.9-0.3
Percentage of Revenues0.10.00.10.0-0.00.0-0.0-0.1-1.1-0.10.1-0.00.1-0.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.10.00.10.0-0.00.0-0.0-0.1-1.1-0.10.1-0.00.1-0.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo aep:Alternative0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:SouthwesternElectricPowerCo, aep:AlternativeandOther


Revenuesdei:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value5.20.12.70.2-1.31.6-0.9-4.0-38.1-5.32.6-0.32.9-0.3
Percentage of Revenues0.10.00.10.0-0.00.0-0.0-0.1-1.1-0.10.1-0.00.1-0.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.10.00.10.0-0.00.0-0.0-0.1-1.1-0.10.1-0.00.1-0.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo aep:AlternativeandOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Revenues dei:LegalEntity, us-gaap:StatementBusinessSegments

aep:AEPTransmissionCo, aep:StateTranscos


Revenuesdei:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value365361307304238295251259266243189194183193173167229152120125153
Percentage of Revenues9.68.48.57.56.87.96.96.07.56.05.04.54.64.84.64.16.43.93.22.73.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax9.68.48.57.56.87.96.96.07.56.05.04.54.54.84.64.16.43.93.22.73.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTransmissionCo aep:StateTranscos0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Revenues us-gaap:ConsolidationItems

srt:ConsolidationEliminations


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-367.8-368.4-320.4-374.2-278.6-354.8-323.1-348.2-311.3-332.2-268.3-247.6-169.8-256.7-221.1-226.1
Percentage of Revenues-9.6-8.6-8.9-9.2-8.0-9.5-8.9-8.1-8.7-8.2-7.1-5.7-4.2-6.3-5.8-5.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-9.6-8.6-8.9-9.2-8.0-9.5-8.9-8.1-8.7-8.2-7.1-5.7-4.2-6.4-5.8-5.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:ConsolidationEliminations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Revenues us-gaap:ConsolidationItems, us-gaap:ProductOrService

srt:ConsolidationEliminations, aep:Alternative


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-40.2-11.64.06.6-7.64.5-6.6-16.8-36.90.0520.00.00.0
Percentage of Revenues-1.1-0.30.10.2-0.20.1-0.2-0.4-1.00.01.40.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-1.1-0.30.10.2-0.20.1-0.2-0.4-1.00.01.40.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:ConsolidationEliminations aep:Alternative0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

srt:ConsolidationEliminations, aep:AlternativeandOther


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-42.2-15.20.4-28.4-18.4-21.0-36.7-56.6-106.30.05243-21.3-21.7
Percentage of Revenues-1.1-0.40.0-0.7-0.5-0.6-1.0-1.3-3.00.01.41.0-0.5-0.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-1.1-0.40.0-0.7-0.5-0.6-1.0-1.3-3.00.01.41.0-0.5-0.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:ConsolidationEliminations aep:AlternativeandOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

srt:ConsolidationEliminations, aep:OtherRevenues


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-2.0-3.6-3.6-35.0-10.8-25.5-30.1-39.8-69.40.00.043-21.3-21.7
Percentage of Revenues-0.1-0.1-0.1-0.9-0.3-0.7-0.8-0.9-1.90.00.01.0-0.5-0.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.1-0.1-0.1-0.9-0.3-0.7-0.8-0.9-1.90.00.01.0-0.5-0.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:ConsolidationEliminations aep:OtherRevenues0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Revenues us-gaap:ProductOrService

aep:Alternative


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value12162412-64.1200.0-11.4-94.9-0.261-52.6-35.6-19.1
Percentage of Revenues0.30.40.70.3-1.80.60.0-0.3-2.7-0.01.6-1.2-0.9-0.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.30.40.70.3-1.80.60.0-0.3-2.7-0.01.6-1.2-0.9-0.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:Alternative0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:AlternativeandOther


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value4121727.2-65.2407.12.9-104.3501066.0-44.29.4
Percentage of Revenues1.10.52.00.2-1.91.10.20.1-2.91.22.80.1-1.10.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.10.52.00.2-1.91.10.20.1-2.91.22.80.1-1.10.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AlternativeandOther0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:OtherRevenues


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value294.848-5.5-1.1197.114-9.4504458-8.628
Percentage of Revenues0.80.11.3-0.1-0.00.50.20.3-0.31.31.21.4-0.20.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.80.11.3-0.1-0.00.50.20.3-0.31.31.21.4-0.20.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:OtherRevenues32.45.20.0-7.1-1.528.10.021.2-12.978.20.0105.6-9.131.4

us-gaap:Revenues us-gaap:ProductOrService, us-gaap:StatementBusinessSegments

aep:Alternative, aep:AEPTransmissionHoldco


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1912-3.2-2.2-71.9-3.3-2.0-0.9-15.9-1.8-20.6-14.9-8.9-16.0
Percentage of Revenues0.50.3-0.1-0.1-2.1-0.1-0.1-0.0-0.4-0.0-0.5-0.3-0.2-0.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.50.3-0.1-0.1-2.1-0.1-0.1-0.0-0.4-0.0-0.5-0.3-0.2-0.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:Alternative aep:AEPTransmissionHoldco0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:Alternative, aep:TransmissionAndDistributionCompanies


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2217209.32019105.1115.026-37.9-16.46.0
Percentage of Revenues0.60.40.60.20.60.50.30.10.30.10.7-0.9-0.40.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.60.40.60.20.60.50.30.10.30.10.7-0.9-0.40.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:Alternative aep:TransmissionAndDistributionCompanies0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:Alternative, aep:VerticallyIntegratedUtilities


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value10-0.72.8-1.0-5.20.2-2.21.2-53.5-3.43.30.2-10.3-9.1
Percentage of Revenues0.3-0.00.1-0.0-0.10.0-0.10.0-1.5-0.10.10.0-0.3-0.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.3-0.00.1-0.0-0.10.0-0.10.0-1.5-0.10.10.0-0.3-0.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:Alternative aep:VerticallyIntegratedUtilities0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:AlternativeandOther, aep:AEPTransmissionHoldco


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1912-3.2-2.2-71.9-3.3-2.0-0.9-15.9-1.8-20.6-14.9-8.9-16.0
Percentage of Revenues0.50.3-0.1-0.1-2.1-0.1-0.1-0.0-0.4-0.0-0.5-0.3-0.2-0.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.50.3-0.1-0.1-2.1-0.1-0.1-0.0-0.4-0.0-0.5-0.3-0.2-0.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AlternativeandOther aep:AEPTransmissionHoldco0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:AlternativeandOther, aep:GenerationAndMarketing


Revenuesus-gaap:
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2430-4.5-0.6186.726189.23.5-5.33.121
Percentage of Revenues0.60.8-0.1-0.00.50.20.60.50.20.1-0.10.10.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.60.8-0.1-0.00.50.20.60.50.20.1-0.10.10.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AlternativeandOther aep:GenerationAndMarketing0.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:AlternativeandOther, aep:TransmissionAndDistributionCompanies


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2622254533484344504476-29.04.927
Percentage of Revenues0.70.50.71.11.01.31.21.01.41.12.0-0.70.10.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.70.50.71.11.01.31.21.01.41.12.0-0.70.10.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AlternativeandOther aep:TransmissionAndDistributionCompanies0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:AlternativeandOther, aep:VerticallyIntegratedUtilities


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value11-0.72.8-1.0-5.20.2-2.21.2-53.5-3.4-8.310.0-24.5-3.6
Percentage of Revenues0.3-0.00.1-0.0-0.10.0-0.10.0-1.5-0.1-0.20.2-0.6-0.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.3-0.00.1-0.0-0.10.0-0.10.0-1.5-0.1-0.20.2-0.6-0.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AlternativeandOther aep:VerticallyIntegratedUtilities0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:AlternativeandOther, us-gaap:AllOtherSegments


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2.23.116-2.2-2.3-2.2-2.2-11.22.32.22.22.22.52.0
Percentage of Revenues0.10.10.5-0.1-0.1-0.1-0.1-0.30.10.10.10.10.10.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.10.10.5-0.1-0.1-0.1-0.1-0.30.10.10.10.10.10.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AlternativeandOther us-gaap:AllOtherSegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:OtherRevenues, aep:GenerationAndMarketing


Revenuesus-gaap:
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2430-4.5-0.6186.726189.23.5-5.33.121
Percentage of Revenues0.60.8-0.1-0.00.50.20.60.50.20.1-0.10.10.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.60.8-0.1-0.00.50.20.60.50.20.1-0.10.10.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:OtherRevenues aep:GenerationAndMarketing0.00.00.00.00.00.00.00.00.00.00.0516.71235.3

aep:OtherRevenues, aep:TransmissionAndDistributionCompanies


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value4.05.34.936122932383939508.90.00.0
Percentage of Revenues0.10.10.10.90.40.80.90.91.11.01.30.20.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.10.10.10.90.40.80.90.91.11.01.30.20.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:OtherRevenues aep:TransmissionAndDistributionCompanies0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:OtherRevenues, aep:VerticallyIntegratedUtilities


Revenuesus-gaap:
Period End2021-06-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.30.00.00.00.00.00.0-11.69.8-14.25.5
Percentage of Revenues0.00.00.00.00.00.00.0-0.30.2-0.40.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.00.00.00.0-0.30.2-0.30.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:OtherRevenues aep:VerticallyIntegratedUtilities0.00.00.00.00.00.00.00.00.0-91.615.9

aep:OtherRevenues, us-gaap:AllOtherSegments


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value2.23.116-2.2-2.3-2.2-2.2-11.22.32.22.22.22.52.01114
Percentage of Revenues0.10.10.5-0.1-0.1-0.1-0.1-0.30.10.10.10.10.10.00.30.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.10.10.5-0.1-0.1-0.1-0.1-0.30.10.10.10.10.10.00.30.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:OtherRevenues us-gaap:AllOtherSegments64.766.00.0-55.0-79.3100.00.0-533.379.357.90.061.17.540.00.0100.0

us-gaap:Revenues us-gaap:StatementBusinessSegments

aep:AEPTransmissionHoldco


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-03-31
Value378377321317249310264273278256198187212205156
Percentage of Revenues9.98.88.97.87.18.37.36.37.86.35.24.35.35.14.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax9.98.88.97.87.18.37.36.37.86.35.24.35.25.14.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTransmissionHoldco0.00.00.00.00.00.00.00.00.00.00.00.096.092.80.0

aep:GenerationAndMarketing


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value436634420490376438429533412481452521460505407465410591694859683748606835801117078590191312518521001892920
Percentage of Revenues11.414.811.612.010.811.711.912.411.511.911.912.011.512.510.711.311.515.018.318.517.618.516.818.820.324.919.520.922.626.922.624.024.924.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax11.414.811.612.010.811.711.912.411.511.911.912.011.412.510.711.311.515.018.318.517.618.516.818.820.324.919.520.922.626.922.624.024.924.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:GenerationAndMarketing0.00.00.00.00.00.00.00.00.00.00.00.0100.7104.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:TransmissionAndDistributionCompanies


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value110310881039116510341106102811861045122211421211113711621106117310531086953127510961096103611891061127012341231113412151085119510641134
Percentage of Revenues28.825.428.828.729.629.528.427.529.330.130.028.028.328.729.028.629.527.625.227.428.227.128.726.826.927.030.728.628.026.128.828.629.729.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax28.825.428.828.729.629.528.427.529.330.130.028.028.028.829.028.629.527.625.227.428.227.128.726.826.927.030.728.628.026.128.828.629.729.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:TransmissionAndDistributionCompanies0.00.00.00.00.00.00.00.00.0<