AEP


Line plots across dimensions of each concept
Tables

Table of contents



us-gaap:CommonStockValue
dei:LegalEntity

us-gaap:CommonStockSharesIssued
us-gaap:StatementEquityComponents

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax

us-gaap:Revenues
dei:LegalEntity
us-gaap:ConsolidationItems
us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments, dei:LegalEntity
us-gaap:ProductOrService
us-gaap:CostOfGoodsAndServicesSold
us-gaap:ProductOrService, dei:LegalEntity
us-gaap:ProductOrService, us-gaap:DerivativeInstrumentRisk, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:ProductOrService, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome

us-gaap:OperatingExpenses
dei:LegalEntity

us-gaap:OperatingIncomeLoss
dei:LegalEntity

us-gaap:InterestExpense

us-gaap:OtherNonoperatingIncomeExpense
dei:LegalEntity

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxesPaidNet
dei:LegalEntity

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

us-gaap:ComprehensiveIncomeNetOfTax
dei:LegalEntity

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
dei:LegalEntity

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
dei:LegalEntity

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

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

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

us-gaap:Liabilities
dei:LegalEntity

us-gaap:LiabilitiesAndStockholdersEquity
dei:LegalEntity

us-gaap:StockholdersEquity
dei:LegalEntity

us-gaap:AssetsCurrent
dei:LegalEntity

us-gaap:CashAndCashEquivalentsAtCarryingValue
dei:LegalEntity

us-gaap:ShortTermInvestments
us-gaap:ConsolidatedEntities

us-gaap:AccountsReceivableNetCurrent
dei:LegalEntity

us-gaap:PrepaidExpenseAndOtherAssetsCurrent
dei:LegalEntity

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

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
dei:LegalEntity
us-gaap:ConsolidationItems
us-gaap:PropertyPlantAndEquipmentByType, us-gaap:PublicUtility, dei:LegalEntity
us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments, dei:LegalEntity
us-gaap:VariableInterestEntitiesByClassificationOfEntity, dei:LegalEntity

us-gaap:PropertyPlantAndEquipmentNet
dei:LegalEntity
us-gaap:ConsolidationItems
us-gaap:PropertyPlantAndEquipmentByType, us-gaap:PublicUtility, dei:LegalEntity
us-gaap:PublicUtility, aep:BaseRate, dei:LegalEntity
us-gaap:PublicUtility, aep:RegulatedStatus
us-gaap:PublicUtility, aep:RegulatedStatus, dei:LegalEntity
us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments, dei:LegalEntity

us-gaap:Goodwill

us-gaap:OtherAssetsNoncurrent
dei:LegalEntity

us-gaap:LiabilitiesCurrent
dei:LegalEntity

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

us-gaap:AccountsPayableCurrent
dei:LegalEntity

us-gaap:TaxesPayableCurrent
dei:LegalEntity

us-gaap:OtherLiabilitiesCurrent
dei:LegalEntity

us-gaap:LiabilitiesNoncurrent
dei:LegalEntity

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

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

us-gaap:DeferredTaxLiabilitiesNoncurrent
dei:LegalEntity

us-gaap:MinorityInterest
dei:LegalEntity

us-gaap:OtherLiabilitiesNoncurrent
dei:LegalEntity

us-gaap:StockholdersEquity
dei:LegalEntity

us-gaap:CommonStockValue
dei:LegalEntity

us-gaap:RetainedEarningsAccumulatedDeficit
dei:LegalEntity

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

us-gaap:NetCashProvidedByUsedInOperatingActivities
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInInvestingActivities
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInFinancingActivities
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInOperatingActivities
dei:LegalEntity

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

us-gaap:IncreaseDecreaseInInventories
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInInvestingActivities
dei:LegalEntity
dei:LegalEntity
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:PaymentsToAcquireInvestments
dei:LegalEntity

us-gaap:NetCashProvidedByUsedInFinancingActivities
dei:LegalEntity

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

us-gaap:RepaymentsOfLongTermDebt

us-gaap:RepaymentsOfLongTermDebt

us-gaap:EffectiveIncomeTaxRateContinuingOperations
dei:LegalEntity

us-gaap:OperatingLeaseRightOfUseAsset
dei:LegalEntity
dei:LegalEntity
us-gaap:CashAndCashEquivalentsPeriodIncreaseDecrease

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
dei:LegalEntity

us-gaap:ProceedsFromSaleOfShortTermInvestments
aep:BaseRate, dei:LegalEntity
aep:AdditionalRefundforCurrentYearTaxReformRateChange
aep:BaseRate, dei:LegalEntity
aep:AdditionalRevenuesRecognizedtobeSurchargedtoCustomers
aep:BaseRate, dei:LegalEntity
aep:AdjustedRequestedAnnualIncrease
dei:LegalEntity
aep:AffiliatedDividendsCommonStock
us-gaap:StatementEquityComponents, dei:LegalEntity
dei:LegalEntity
aep:AmortizationOfGenerationDeferrals

aep:AmortizationOfNuclearFuel
dei:LegalEntity
aep:BaseRate, dei:LegalEntity
aep:ApprovedAnnualRevenueIncrease
aep:BaseRate, us-gaap:SubsequentEventType
aep:BaseRate, us-gaap:SubsequentEventType, dei:LegalEntity
aep:BaseRate, us-gaap:SubsequentEventType
aep:ApprovedReturnonCommonEquity
aep:BaseRate, us-gaap:SubsequentEventType, dei:LegalEntity
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
dei:LegalEntity
aep:CarryingCostsIncome

aep:ChangesInFairValueAllocatedToRegulatedJurisdiction
dei:LegalEntity
dei:LegalEntity
aep:CostOfPurchasedPowerFromAffiliate
dei:LegalEntity
aep:DeferralOfIncrementalNuclearRefuelingOutageExpensesNet

aep:DeferralOfOhioCapacityCosts
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities
aep:DilutiveSecurities1
us-gaap:SubsequentEventType, aep:BaseRate, aep:DisallowanceItem, dei:LegalEntity
aep:DisallowedIteminCommissionOrder
dei:LegalEntity
aep:EffectiveIncomeTaxRateReconciliationAFUDCEquityPercentage

aep:EffectiveIncomeTaxRateReconciliationDiscreteTaxAdjustmentsPercentage
dei:LegalEntity

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

aep:EffectiveIncomeTaxRateReconciliationproductionandinvestmenttaxcredits
dei:LegalEntity

aep:EffectiveInterestRatesOnSecuritizationOfAccountsReceivable

aep:FuelOverUnderRecoveryNet
dei:LegalEntity

aep:GainLossOnFairValuePortionOfLongTermDebt

aep:GrossRealizedGainsOnInvestmentSalesOnShortTermInvestment

aep:GrossRealizedLossesOnInvestmentSalesOnShortTermInvestment
us-gaap:SubsequentEventType, aep:BaseRate, aep:RefundItem, dei:LegalEntity
aep:ItemtobeRefundedinCommissionOrder
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:MoneyPoolParticipantbyCompanyType, dei:LegalEntity
aep:MinimumInterestRate
aep:MoneyPoolParticipantbyCompanyType, dei:LegalEntity
aep:MinimumInterestRateForFundsBorrowed
aep:MoneyPoolParticipantbyCompanyType, dei:LegalEntity
aep:MinimumInterestRateforFundsLoaned

aep:NetUncollectibleAccountsReceivableWrittenOff

aep:OtherComprehensiveIncomeUnrealizedGainLossArisingDuringPeriodNetOfTax
dei:LegalEntity
us-gaap:DerivativeInstrumentRisk, us-gaap:StatementEquityComponents
us-gaap:DerivativeInstrumentRisk, us-gaap:StatementEquityComponents, dei:LegalEntity

aep:ProvisionforRefundGlobalSettlement
dei:LegalEntity
aep:BaseRate, dei:LegalEntity
aep:RefundforCurrentYearTaxReformRateChange
aep:BaseRate, dei:LegalEntity
aep:RequestedAnnualIncrease
us-gaap:PublicUtility, aep:BaseRate, dei:LegalEntity
aep:BaseRate, dei:LegalEntity
aep:RequestedReturnOnEquity
dei:LegalEntity
aep:ReversalofaRegulatoryProvision
aep:BaseRate, us-gaap:SubsequentEventType
aep:SettlementAgreementAnnualDecrease
aep:BaseRate, us-gaap:SubsequentEventType, dei:LegalEntity
aep:ApprovedItem, aep:BaseRate, us-gaap:SubsequentEventType
aep:SettlementAgreementApprovedforRecovery
aep:ApprovedItem, aep:BaseRate, us-gaap:SubsequentEventType, dei:LegalEntity
aep:BaseRate, us-gaap:FinancialInstrument, us-gaap:SubsequentEventType
aep:SettlementAgreementCapitalStructure
aep:BaseRate, us-gaap:FinancialInstrument, us-gaap:SubsequentEventType, dei:LegalEntity
aep:BaseRate, aep:DisallowanceItem, us-gaap:SubsequentEventType
aep:SettlementAgreementDisallowance
aep:BaseRate, aep:DisallowanceItem, us-gaap:SubsequentEventType, dei:LegalEntity
aep:BaseRate, aep:RefundItem, us-gaap:SubsequentEventType
aep:SettlementAgreementRefundtoCustomers
aep:BaseRate, aep:RefundItem, us-gaap:SubsequentEventType, dei:LegalEntity
aep:BaseRate, us-gaap:SubsequentEventType
aep:SettlementAgreementReturnonCommonEquity
aep:BaseRate, us-gaap:SubsequentEventType, dei:LegalEntity

aep:StockholdersEquityASU201613Adoption
dei:LegalEntity
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents, dei:LegalEntity
dei:LegalEntity
us-gaap:AdjustmentsToAdditionalPaidInCapitalOther
us-gaap:StatementEquityComponents, dei:LegalEntity

us-gaap:AmortizationOfDeferredPropertyTaxes
dei:LegalEntity

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
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
us-gaap:FinancialInstrument, aep:TrustAssets
us-gaap:FinancialInstrument, aep:TrustAssets, dei:LegalEntity

us-gaap:CapitalExpendituresIncurredButNotYetPaid

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

us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:ConstructionInProgressExpendituresIncurredButNotYetPaid
dei:LegalEntity

us-gaap:DeferredIncomeTaxExpenseBenefit
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:DerivativeGainLossOnDerivativeNet

us-gaap:DividendsCommonStock
us-gaap:StatementEquityComponents

us-gaap:EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
dei:LegalEntity

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
dei:LegalEntity

us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersOutOfLevel3
dei:LegalEntity

us-gaap:FinanceLeasePrincipalPayments
dei:LegalEntity

us-gaap:GainLossOnDerivativeInstrumentsNetPretax

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
dei:LegalEntity

us-gaap:IncomeLossFromEquityMethodInvestments
dei:LegalEntity

us-gaap:IncreaseDecreaseInAccountsAndOtherReceivables
dei:LegalEntity

us-gaap:IncreaseDecreaseInAccountsPayable
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

us-gaap:InterestPaidNet
dei:LegalEntity
dei:LegalEntity
us-gaap:InvestmentIncomeInterestAndDividend
us-gaap:ConsolidationItems, dei:LegalEntity
us-gaap:StatementBusinessSegments, dei:LegalEntity
dei:LegalEntity
us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents, dei:LegalEntity

us-gaap:NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent
dei:LegalEntity
aep:BaseRate, aep:DisallowanceItem, dei:LegalEntity
us-gaap:OtherAssetImpairmentCharges
aep:BaseRate, dei:LegalEntity
us-gaap:PublicUtility, aep:BaseRate, dei:LegalEntity
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome
us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, dei:LegalEntity
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents, dei:LegalEntity

us-gaap:OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
dei:LegalEntity

us-gaap:OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax
dei:LegalEntity

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

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
dei:LegalEntity

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

us-gaap:PaymentsForConstructionInProcess
dei:LegalEntity

us-gaap:PaymentsForNuclearFuel
dei:LegalEntity

us-gaap:PaymentsForProceedsFromOtherInvestingActivities
dei:LegalEntity
dei:LegalEntity
us-gaap:PaymentsOfDistributionsToAffiliates

us-gaap:PaymentsOfDividendsCommonStock
dei:LegalEntity
aep:TrustAssets
us-gaap:PaymentsToAcquireAvailableForSaleSecurities
aep:TrustAssets, dei:LegalEntity

us-gaap:PaymentsToAcquireShortTermInvestments
dei:LegalEntity
us-gaap:ProceedsFromContributionsFromParent

us-gaap:ProceedsFromIssuanceOfCommonStock

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:PublicUtilitiesApprovedReturnOnEquityPercentage
us-gaap:SubsequentEventType, aep:BaseRate, dei:LegalEntity
aep:BaseRate, dei:LegalEntity
us-gaap:PublicUtilitiesRequestedReturnOnEquityPercentage
us-gaap:PublicUtility, aep:BaseRate, dei:LegalEntity

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

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

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

us-gaap:RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability
dei:LegalEntity
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesNewIssues

us-gaap:StockIssuedDuringPeriodValueNewIssues
us-gaap:StatementEquityComponents

us-gaap:StockholdersEquityOther
us-gaap:StatementEquityComponents

us-gaap:TaxesExcludingIncomeAndExciseTaxes
dei:LegalEntity

us-gaap:UnrealizedGainLossOnDerivatives
dei:LegalEntity
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

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

aep:AccountsReceivableRetainedInterestAndPledgedAsCollateralLessUncollectibleAccounts
dei:LegalEntity
aep:AccruedReimbursementofSpentNuclearFuelCosts
dei:LegalEntity
aep:AccumulatedProvisionsForRateRefunds
dei:LegalEntity
aep:AcquisitionOfNuclearFuelIncludedInCurrentLiabilities
aep:TrustAssets
aep:AdjustedCostOfDebtSecurities
aep:TrustAssets, dei:LegalEntity
aep:TrustAssets
aep:AdjustedCostOfEquitySecurities
aep:TrustAssets, dei:LegalEntity
us-gaap:StatementBusinessSegments
aep:AffiliatedLongTermDebtCurrent
us-gaap:ConsolidationItems
aep:AffiliatedLongTermDebtNoncurrent
us-gaap:StatementBusinessSegments

aep:BadDebtReservesRelatedToSecuritizedSaleOfAccountsReceivable

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

aep:CumulativeFairValueHedgingAdjustmentintheCarryingAmountoftheHedgedAssetLiability
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, dei:LegalEntity
dei:LegalEntity
aep:EmployeeBenefitsAndPensionAssets

aep:EmployeeBenefitsAndPensionObligations
dei:LegalEntity

aep:ExpectedReimbursementForSpentNuclearFuelDryCaskStorage
dei:LegalEntity

aep:FairValueOfDerivativeLiabilitiesSubjectToCrossDefaultProvisions
dei:LegalEntity
us-gaap:Range, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:FairValueByFairValueHierarchyLevel
aep:FairValueSignificantUnobservableInputPricePerUnit
us-gaap:Range, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:FairValueByFairValueHierarchyLevel, dei:LegalEntity

aep:MaxPotentialLossOnMasterLeaseAgreements
dei:LegalEntity
us-gaap:GuaranteeObligationsByNature
aep:MaximumFuturePaymentsforLettersofCreditIssuedUndertheUncommittedFacility
us-gaap:GuaranteeObligationsByNature, dei:LegalEntity

aep:MezzanineEquity
dei:LegalEntity
aep:OklaunionPurchasePowerAgreementCurrent
dei:LegalEntity
aep:RenewableEnergyCredits

aep:SpentNuclearFuelAndDecommissioningTrusts

aep:TotalMezzanineEquity

aep:TrustFundAssetsOneTimeFeeObligationForNuclearFuelDisposition
dei:LegalEntity

aep:UnbilledReceivablesRelatedToSecuritizationSaleOfAccountsReceivable

dei:EntityCommonStockSharesOutstanding
dei:LegalEntity
dei:LegalEntity
us-gaap:AccountsPayableRelatedPartiesCurrent

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

us-gaap:AdditionalPaidInCapital
dei:LegalEntity

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent
dei:LegalEntity

us-gaap:AssetRetirementObligationsNoncurrent
dei:LegalEntity

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

us-gaap:AssetsNeededForImmediateSettlementAggregateFairValue
dei:LegalEntity

us-gaap:AssetsNoncurrent
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
us-gaap:FairValueByFairValueHierarchyLevel, dei:LegalEntity

us-gaap:CollateralAlreadyPostedAggregateFairValue
dei:LegalEntity

us-gaap:CommercialPaper

us-gaap:ConstructionInProgressGross
dei:LegalEntity

us-gaap:CustomerDepositsCurrent
dei:LegalEntity
us-gaap:ShortTermDebtType
us-gaap:DebtWeightedAverageInterestRate
us-gaap:ShortTermDebtType, dei:LegalEntity
dei:LegalEntity
us-gaap:DeferredTaxAssetsPropertyPlantAndEquipment

us-gaap:DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
dei:LegalEntity

us-gaap:DelinquentAmountAtEndOfPeriodOnLoansManagedAndSecuritized

us-gaap:DerivativeAssets

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

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

us-gaap:DerivativeLiabilities

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

us-gaap:DerivativeLiabilitiesNoncurrent
dei:LegalEntity
us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeInstrumentRisk, dei:LegalEntity
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship
us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, dei:LegalEntity
us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeNotionalAmount
us-gaap:DerivativeInstrumentRisk, dei:LegalEntity
dei:LegalEntity
us-gaap:DueFromRelatedPartiesCurrent
dei:LegalEntity
us-gaap:DueToRelatedPartiesCurrent

us-gaap:FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs
dei:LegalEntity
us-gaap:ConsolidatedEntities, us-gaap:StatementBusinessSegments
us-gaap:GuaranteeObligationsCurrentCarryingValue
us-gaap:MajorPropertyClass
dei:LegalEntity
us-gaap:IncomeTaxesReceivable

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

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

us-gaap:InvestmentOwnedAtCost
us-gaap:FinancialInstrument

us-gaap:InvestmentOwnedUnrecognizedUnrealizedAppreciation
us-gaap:FinancialInstrument

us-gaap:InvestmentOwnedUnrecognizedUnrealizedDepreciation
us-gaap:FinancialInstrument

us-gaap:JuniorSubordinatedNotes

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

us-gaap:LongtermPollutionControlBondCurrentAndNoncurrent

us-gaap:MarginDepositAssets
dei:LegalEntity
us-gaap:MembersCapital
dei:LegalEntity
us-gaap:MembersEquity
us-gaap:StatementEquityComponents, 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:NotesPayable
dei:LegalEntity
us-gaap:ConsolidationItems, dei:LegalEntity
us-gaap:NotesReceivableRelatedParties
us-gaap:StatementBusinessSegments, dei:LegalEntity

us-gaap:ObligationToReturnSecuritiesReceivedAsCollateral
dei:LegalEntity

us-gaap:OperatingLeaseLiabilityCurrent
dei:LegalEntity

us-gaap:OperatingLeaseLiabilityNoncurrent
dei:LegalEntity

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

us-gaap:OtherLongTermDebt

us-gaap:OtherNotesPayable

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

us-gaap:PrincipalAmountOutstandingOnLoansHeldForSaleOrSecuritization

us-gaap:PublicUtilitiesPropertyPlantAndEquipmentDistribution
dei:LegalEntity

us-gaap:PublicUtilitiesPropertyPlantAndEquipmentGenerationOrProcessing
dei:LegalEntity
us-gaap:PropertyPlantAndEquipmentByType, us-gaap:PublicUtility, dei:LegalEntity

us-gaap:PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment
dei:LegalEntity
us-gaap:VariableInterestEntitiesByClassificationOfEntity, dei:LegalEntity

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

us-gaap:RedeemableNoncontrollingInterestEquityCarryingAmount

us-gaap:RegulatoryAssetsCurrent
dei:LegalEntity

us-gaap:RegulatoryAssetsNoncurrent

us-gaap:RegulatoryLiabilityCurrent
dei:LegalEntity

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

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

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

us-gaap:SecuredDebt

us-gaap:SecuritiesReceivedAsCollateral

us-gaap:SecuritizedRegulatoryTransitionAssetsNoncurrent
dei:LegalEntity
us-gaap:VariableInterestEntitiesByClassificationOfEntity, dei:LegalEntity

us-gaap:ShortTermBankLoansAndNotesPayable
dei:LegalEntity

us-gaap:ShortTermBorrowings

us-gaap:ShortTermDebtWeightedAverageInterestRate

us-gaap:SpentNuclearFuelObligationNoncurrent

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

us-gaap:TransfersAccountedForAsSecuredBorrowingsAssetsCarryingAmount

us-gaap:TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount

us-gaap:TreasuryStockShares

us-gaap:UnbilledReceivablesCurrent
dei:LegalEntity

us-gaap:UnsecuredDebt

Tables

  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:CommonStockValue █▇▇▇▇▇▇▇▇▆▆▆▆▆▆▆▆▆▆▆▆▅▅▅▅▄▄▄▄▃▃▃▃▂▂▂▁▁33503343334133403338333733363335333233293328332833283328332833283325332433223321331733133312330833053303329932963291328932863284328032743271326632633257NANANA3239NANANA
us-gaap:CommonStockSharesIssued ███▇▇▇▇▇▆▆▆▆▆▆▆▆▆▆▆▆▆▅▅▄▄▄▄▄▄▄▃▃▂▂▂▂▂▁515514514513513513513513512512512512512512512511511511511510510509509508508508507507506506505505504503503502502501NANANA498NANANA
 us-gaap:CommonStockSharesIssued us-gaap:StatementEquityComponents us-gaap:CommonStock████▇▇▇▇▇▇▇▇▇▇▇▇▆▆▆▆▆▆▆▆▅▅▅▅▄▄▄▄▄▃▃▃▃▂▂▂▁▁515514514514513513513513512512512512512512512512511511511511510510510509508508508507506506506505505504503502502501500500499498NANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding 496NA495495494NA493493493NA493492492NA491491491NA490490489NA488488488NA487486486NA485484484NA482482481NA479479478NANANANA
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic 494NA493493493NA493492492NA491491491NA491491491NA490490489NA488488487NA486486485NA484484483NA482481481NA479479478NANANANA
us-gaap:EarningsPerShareBasic ▆▅▇▆▆▆▆▆▆▆▆▆▇▆▁▆▆▆▆▆▇▅▆▆▆▆▆▆▆▄▆▆▆▅█▆▆▅▆▅▆▅▆▅▆1.00.310000000000000051.490.931.160.731.171.070.920.82000000000000031.110.761.20.76-1.561.021.020.951.060.881.290.391.010.81.150.710.890.690.750.051.00.750.80.631.920.730.730.371.160.280.720.490.930.670.89
us-gaap:EarningsPerShareDiluted ▆▅▇▆▆▆▆▆▆▆▆▆▇▆▁▆▆▆▆▆▇▅▆▆▆▆▆▆▆▄▆▆▆▅█▆▆▅▆▅▆▅▆▅▆1.00.310000000000000051.480.931.160.73999999999999981.171.070.920.811.10.761.20.76-1.561.021.020.951.060.881.290.391.010.81.150.710.890.690.750.051.00.750.80.631.920.730.730.371.160.280.720.490.930.670.89
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax ▄▃▆▃▅▄▆▅▅▄▅▃▄▄█▄▅▃▇▄█▅▆▅█▄▆▃▄▃▅▃▃▂▆▃▃▂▅▂▃▁▃▁▂374736164315357340563801433340574038381041043576393337904652389240443614443239424708402643024044464837734176358238263613415635513625344443333609373034344064336035693282354732023458
us-gaap:Revenues ▄▃▆▃▅▄▆▅▅▄▅▃▄▄█▄▅▃▇▄█▅▆▅█▄▆▃▄▃▅▃▃▂▆▃▃▂▅▂▃▁▃▁▂374736164315357340563801433340134048381041043576393337904652389240443614443239424708402643024044464837734176358238263613415635513625344443333609373034344064336035693282354732023458
 us-gaap:Revenues dei:LegalEntity aep:AEPTexasInc.▅▄█▆▄▄▆▄▃▃▅▄▂▂▄▃▁423391489438390402433388371374431389343362403365330NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Revenues dei:LegalEntity aep:AppalachianPowerCo▃▃▃▁▄▂▄▁▅▃▃▁▄▃▄▁▅▁▃▂▇▃▂▂▇▆▆▃█▇▆▂▅▄▆▃▅▅▅▂749720755655792718762667820746719675792729778673820655727681899735709694913869849746951890864716805763858751831804840703NANANANANA
 us-gaap:Revenues dei:LegalEntity aep:IndianaMichiganPowerCo▅▄▇▄▇▅█▆▅▄▅▁▅▃▆▃▄▂▅▄▆▄▄▄█▆█▄▆▄▆▃▄▃▇▃▅▃▇▃570538611543614574629589576535557467560514597522532487568544586531542533641595638549583544598510546521611521560524608509NANANANANA
 us-gaap:Revenues dei:LegalEntity aep:OhioPowerCo▁▁▁▁▂▁▂▂▂▁▁▁▁▁▂▁▂▁▂▁▂▂▂▂▂▃▃▃▃▃▃▃▃▃▂▂▄█▂▁69064371060683674577874879073174266374658887173076369278270591887183978688011461279110212331217135911131237121190777913942816855721NANANANANA
 us-gaap:Revenues dei:LegalEntity aep:SouthwesternElectricPowerCo▃▃█▂▄▃▇▅▄▄▇▄▃▃█▄▂▂▇▄▄▄▇▅▄▄█▄▃▁▆▃▁▂▇▃▂▁▆▂385408545375421410535457419436517424401402539427379378532438431424531449440428552420394352485390348356534399362338480361NANANANANA
 us-gaap:Revenues us-gaap:StatementBusinessSegments aep:GenerationAndMarketing▁▁▂▁▂▁▂▁▂▁▁▁▃▃▅▃▄▃▅▄▇▄▅▅█▅▆▅▅438429533412481452521460505407465410591694859683748606835801117078590191312518521001892920NANANANANANANANANANANANANANANANA
 us-gaap:Revenues us-gaap:StatementBusinessSegments aep:TransmissionAndDistributionCompanies▄▃▆▃▇▅▇▅▆▄▆▃▄▁█▄▄▃▆▃█▇▇▅▇▄▆▃▅1106102811861045122211421211113711621106117310531086953127510961096103611891061127012341231113412151085119510641134NANANANANANANANANANANANANANANANA
 us-gaap:Revenues us-gaap:StatementBusinessSegments aep:VerticallyIntegratedUtilities▃▃▇▂▅▃▇▄▅▄▆▂▄▂▆▂▃▁▅▃▆▃▅▃▇▅█▄▆22262194264521232403225126362349240822982482212022902164255621252245201324712183250521962450225225862437273823022515NANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold us-gaap:ProductOrService us-gaap:ElectricityGeneration▂▁▅▄▄▃█▅▄▄▆355278631480550450840566501481707NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold us-gaap:ProductOrService us-gaap:ElectricityPurchased▄▅▄▁▅▆▄▃█▄▂795858783660861875784776990808718NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold us-gaap:ProductOrService,dei:LegalEntity us-gaap:ElectricityGeneration,aep:AEPTexasInc.▁▂▇▅▆▆█▄▅021189101358NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold us-gaap:ProductOrService,dei:LegalEntity us-gaap:ElectricityGeneration,aep:AppalachianPowerCo▃▂▅▄▅▂█▄▁1118517716118310126315569NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold us-gaap:ProductOrService,dei:LegalEntity us-gaap:ElectricityGeneration,aep:IndianaMichiganPowerCo▄▁▄▂▄▅█▆▆532961425771957377NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold us-gaap:ProductOrService,dei:LegalEntity us-gaap:ElectricityGeneration,aep:PublicServiceCoOfOklahoma▁▁█▃▃▂█▄▄1613984438291045848NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold us-gaap:ProductOrService,dei:LegalEntity us-gaap:ElectricityGeneration,aep:SouthwesternElectricPowerCo▂▁█▅▆▄█▅▆8972148117133108152114126NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold us-gaap:ProductOrService,dei:LegalEntity us-gaap:ElectricityPurchased,aep:AppalachianPowerCo▄▅▂▁▃▅▂▁█12213778641101528064205NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold us-gaap:ProductOrService,dei:LegalEntity us-gaap:ElectricityPurchased,aep:IndianaMichiganPowerCo▃█▁▂█▄▂▆▄506944486954486355NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold us-gaap:ProductOrService,dei:LegalEntity us-gaap:ElectricityPurchased,aep:OhioPowerCo▃▄▄▁▅▃▅▄█149153158121174149166162205NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold us-gaap:ProductOrService,dei:LegalEntity us-gaap:ElectricityPurchased,aep:PublicServiceCoOfOklahoma▃▅▅▁▇█▅▄▇110118115102122127116113122NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold us-gaap:ProductOrService,dei:LegalEntity us-gaap:ElectricityPurchased,aep:SouthwesternElectricPowerCo▃█▃▁▁▃▂▅▃436944333244365342NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 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█▄▃▅▄▁▂▂▁▃▃511782112-9-5-4-1324NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:CostOfGoodsAndServicesSold us-gaap:ProductOrService,us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:ElectricityPurchased,us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome█▄▃▅▄▁▂▂▁▃▃511782112-9-5-4-1324NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
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 us-gaap:OperatingExpenses dei:LegalEntity aep:AppalachianPowerCo▃▆▄▃▄▃▆▁▄▂▂▂▂▃▂▁▃▁▂▂▄▄▃▃▆█▆▅█▇▆▂▄▅▇▅▆▆▇▆578694612578640610712534627571546547572593573515575521569536625627579583693767702654786748721573636661735662715702728694NANANANANA
 us-gaap:OperatingExpenses dei:LegalEntity aep:IndianaMichiganPowerCo▃▆▆▄▆▇▇▄▅▃▃▂▂▄▄▂▁▂▄▃▄▅▅▄▆██▄▆▇▇▃▄▆▆▃▄▆▅▄453497503465499522519472479451442432441475466427416436464452461491480476495534536471502518517446469500510457464495492467NANANANANA
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 us-gaap:OperatingIncomeLoss dei:LegalEntity aep:AEPTexasInc.▆▁▇▃▅▅▆▆▅▆█▇▅▅▇▇▅89411838708494868197129109838111210382NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingIncomeLoss dei:LegalEntity aep:AEPTransmissionCo█▆▇█▇▄▄▄▅▄▄█▄▂▃▅▁162122142161141919794112969516590607610834NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OperatingIncomeLoss dei:LegalEntity aep:AppalachianPowerCo▅▁▅▃▅▄▂▄▆▅▅▄▇▄▆▅▇▄▅▅█▄▄▄▇▃▅▃▅▅▅▅▅▃▄▃▄▃▄▁17125142761521084913219317417312722013620415824413315714527310713011022010114792164142142143169102122881161011129NANANANANA
 us-gaap:OperatingIncomeLoss dei:LegalEntity aep:IndianaMichiganPowerCo▆▂▆▄▆▃▆▆▅▅▆▂▆▂▇▅▆▃▆▅▇▂▃▃█▃▆▄▄▁▄▃▄▁▅▃▅▂▆▂11640107771155211011797841153511839131941155010391124396257146601027781268064762010064952911542NANANANANA
 us-gaap:OperatingIncomeLoss dei:LegalEntity aep:OhioPowerCo▃▃▃▃▄▃▃▃▃▃▃▃▃▃▄▃▃▃▃▃▃▃▃▃▃▄▅▃▄▁▅▄▅▃▃▃▅█▄▃1076398771621187910411714515411915064171138134100140961229910411411516231273244-81279210269637014329958319089NANANANANA
us-gaap:InterestExpense ██▇▄▅▄▅▄▃▂▂▂▂▁▂▂▂▁▂▂▂▂▂▂▂▂▂▃▃█▃▃▃▁▄▃▄▄▄▄▄292290275250255251256242234227223222221210225224217214221224223223221221220221225228232291233235229210242239242249251249250NANANANA
us-gaap:OtherNonoperatingIncomeExpense ▁█▅▇█▃▇▇▆-483680665NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:OtherNonoperatingIncomeExpense dei:LegalEntity aep:IndianaMichiganPowerCo▁▁▃█▆▃█▄▄223653644NANANANANANANANANANANANANANANANANANANANANA22NANA33NANA45NANANANANA
us-gaap:IncomeTaxExpenseBenefit ▆▅▆▅▆▅▅▆▆▇▇▇█▆▁▇▇▆▇▇█▆▇▇█▇▇▆▇▅▇▇▇▆█▇▇▆▇▆▇46-4340-544421-807210217126419034360-5341652359227522533315126921530716425768195-162411901893233417427811325865207NANANANA
us-gaap:IncomeTaxesPaidNet ▆▆▆▆▆▆▅▆▆▆▆▇▅▆▆▆▆▆▆▇▆▆▆▇▆▆▅▆▆▅▆▆▅▆▄▆▆▆▁█▆0-1632003-6134051467-88-2618741896284669-69-549-19-38-223-651-134132-25-417176-2NANANANA
 us-gaap:IncomeTaxesPaidNet dei:LegalEntity aep:AEPTexasInc.▅▁▇█▅█▆▃▅▅▃0-391420-5228-220-5-24NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IncomeTaxesPaidNet dei:LegalEntity aep:AEPTransmissionCo▆▄██▆▇▆▅▆▅▄▁▆▄▄0-281218-11-11-200-13-26-660-25-31NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IncomeTaxesPaidNet dei:LegalEntity aep:AppalachianPowerCo▇▇▇▇▇▅▇▇▇▇▆█▇▅▇█▆▆▇▇▇▆▇▇▇▆▆▇▇▇▇▆▆▇▅▅▇▆▁0423278-3971906-7320-332746-17-32850-62010-24-4002020-7-27-41-340-13-170NANANANANANA
 us-gaap:IncomeTaxesPaidNet dei:LegalEntity aep:IndianaMichiganPowerCo▅▃▆▇▅█▅▄▅▄▄▂▅▅▄▄▅▅▅▆▅▅▄▆▅▅▅▄▅▅▅▅▄▅▁▄▅▅▁0-361231-359-2-230-20-12-570-3-12-18-430151-8-141304-7-19-872-8-230-76-18-1-4-74NANANANANANA
 us-gaap:IncomeTaxesPaidNet dei:LegalEntity aep:OhioPowerCo▆▅▆▆▆▅▆▇▆▅▅█▆▇▇▇█▆▆▆▆▆▆▆▆▇▅▇▅▇▆▆▅▇▆▆▆▇▁0-1811140-29450-21-7751424559722320028410054-1051-2361822-7391624132-137NANANANANANA
 us-gaap:IncomeTaxesPaidNet dei:LegalEntity aep:PublicServiceCoOfOklahoma▆▇▆▇▆█▆▆▆▃▆▁▆█▅▄▃▆▇▆▆▄▆▆▆▇▆▇▆▇▇▆▆▇▃▆▆▆▅064100163-10-26-3-40-212-8-18-23-4840-20-2206-4609111410-26001-10NANANANANANA
 us-gaap:IncomeTaxesPaidNet dei:LegalEntity aep:SouthwesternElectricPowerCo▇▇▇▇▇▇▆▇▇▆▆▄▇█▅▅▇▇▇▇▇▁▆▆▇▅▇▇▆▃▄▅▇▇▆▇▇▆▇011605-3160-4-14-56034-37-431432100-138-6-80-3509-8-79-64-4818-1670-175NANANANANANA
us-gaap:ProfitLoss ▆▅▇▆▇▆▇▆▆▆▆▆▇▆▁▆▆▆▆▆▇▅▆▆▆▆▆▆▆▄▆▆▆▅█▆▆▅▆▅▆▅▆▅▆499152733459574364579530456401556376594375-76450350347052043163119249439156134743433936421488363390311930353355178557137346239446317363
 us-gaap:ProfitLoss dei:LegalEntity aep:AEPTransmissionCo▇▅▆█▆▄▄▄▅▃▃▆▃▂▃▄▁117911071361047178708561591075739527425NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:ProfitLoss dei:LegalEntity aep:AppalachianPowerCo▇▂▆▄█▅▆▅▇▅▆▄▇▅▆▅▇▅▅▄█▃▄▃▆▃▅▃▅▄▅▅▅▄▄▃▃▃▄▁115121045513377877712582865211065104731266574591412848361013062297056636275395231383550-19NANANANANA
 us-gaap:ProfitLoss dei:LegalEntity aep:IndianaMichiganPowerCo█▂▇▅█▃▆█▅▄▅▁▆▄▆▄▆▂▅▄▆▂▃▃▇▃▅▄▄▁▄▃▄▂▄▃▄▁▅▂9221886098297294644264106838755174245650721426278735574043103929392151314546214NANANANANA
 us-gaap:ProfitLoss dei:LegalEntity aep:OhioPowerCo▄▃▃▃▅▄▄▃▄▄▄▃▄▃▄▄▃▃▃▃▃▃▃▃▃▄▅▃▅▁▅▄▅▃▃▄▅█▄▃7549695012888886879928262863799747048714765455456608017821129-6015110115028467516531110037NANANANANA
 us-gaap:ProfitLoss us-gaap:StatementBusinessSegments aep:TransmissionAndDistributionCompanies▄▁▄▄▅▄▄▄▄█▄▃▄▃▅▄▃▂▄▂▃▂▃▃▃▂▄▂▃116291331311561421451141252621441111199415512410863113789776929097771197587NANANANANANANANANANANANANANANANA
 us-gaap:ProfitLoss us-gaap:StatementBusinessSegments aep:TransmissionOperations▇▆▇█▇▅▄▅▆▄▄▇▄▄▄▅▃▃▃▄▃▃▃▃▂▂▂▂▁▁▁▁▁▁▁▁▁14111212715512592741011047776129725969954444466537374347242722181312148911964NANANANANANANANA
 us-gaap:ProfitLoss us-gaap:StatementBusinessSegments aep:VerticallyIntegratedUtilities▄▁█▃▆▂▆▅▄▃▅▂▄▃▆▄▅▂▅▄▅▁▄▃▅▃▃▃▃2466443817830313934527723216429712122015134321027811727520830058220155279173174153181NANANANANANANANANANANANANANANANA
 us-gaap:ProfitLoss us-gaap:StatementBusinessSegments,dei:LegalEntity aep:AEPTCoParent,aep:AEPTransmissionCo▆▄▄▅▄▅█▁▃500000.0300000.0300000.0400000.0100000.0400000.01000000.0-400000.00.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:ProfitLoss us-gaap:StatementBusinessSegments,dei:LegalEntity aep:StateTranscos,aep:AEPTransmissionCo▆▃▅█▅▁▂▂▂1179110713510471778284NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:ProfitLoss us-gaap:StatementEquityComponents,dei:LegalEntity us-gaap:RetainedEarnings,aep:AEPTransmissionCo117NA107136104NA788284NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:ProfitLoss us-gaap:StatementEquityComponents,dei:LegalEntity us-gaap:RetainedEarnings,aep:AppalachianPowerCo115NA10455133NA8777125NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:ProfitLoss us-gaap:StatementEquityComponents,dei:LegalEntity us-gaap:RetainedEarnings,aep:IndianaMichiganPowerCo92NA886098NA729464NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:ProfitLoss us-gaap:StatementEquityComponents,dei:LegalEntity us-gaap:RetainedEarnings,aep:OhioPowerCo75NA6950128NA886879NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTax ▆▅▇▆▆▆▇▆▆▆▆▆▇▆▁▆▆▆▆▆▇▅▆▆▇▆▆▆▆▅▆▆▆▅█▆▆426193776381542329586529455508530384577362-793518494450512431624193492395566532440331394138508359387221911363362NANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest ▄▂▂▁▂▂▃▂▃▂█▂▃▂▂▂▂▂▂▂▃▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂400-21121211212111111121111111101110111NANANANANANANANA
 us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest dei:LegalEntity aep:SouthwesternElectricPowerCo▂▁▁▂▂▁▂▂▂▁█▁▂▁▂▂▂▁▂▁▂▁▂▂▂▁▂▂▂▁▁▂▂▁▂▂▂10011011101101011101010111011100110111NANANANANANANANA
us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest ▆▅▇▆▆▆▇▆▆▆▆▆▇▆▁▆▆▆▆▆▇▅▆▆▇▆▆▆▆▅▆▆▆▅█▆▆▅▇▅▆430192776379543330588530458509542385579364-792519496451513432626194493396567533441332395138509360388221912364363161565129356NANANANA
 us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest dei:LegalEntity aep:AEPTexasInc.▃▁▅▅▃▄▄▃▃█▄▃▃47-1277803459584647165644933NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest dei:LegalEntity aep:AppalachianPowerCo▆▁▆▃▇▄▅▄▇▅▅▃▆▃▆▄▇▃▄▃█▁▂▂▆▃▃▁▄▄▃▃▄▁▃▁▂▂▃110251035413274867612493855111061103721255873581413148361016063307280656375255333403850NANANANANANA
 us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest dei:LegalEntity aep:IndianaMichiganPowerCo▇▂▇▅█▃▆█▅▄▅▁▆▄▆▄▆▂▅▄▆▂▃▃▇▄▅▄▄▂▄▂▄▂▄▃▄▁▅92228960992973956446651068387551752156507214272787445841461439224116473246462NANANANANANA
 us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest dei:LegalEntity aep:OhioPowerCo▃▃▃▃▄▄▄▃▃▄▄▃▄▃▄▃▃▃▃▃▃▃▃▃▃▅▆▂▅▁▅▄▅▆▅▅▅█▄75496850127888868799282628637997469477147654453566014818123134-38156104152219130145168296101NANANANANANA
us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic ▆▅▇▆▇▆▇▆▆▆▆▆▇▆▁▆▆▆▆▆▇▅▆▆▆▆▆▆▆▄▆▆▆▅█▆▆▅▆▅▆▅▆▅▆495153733461572363577528454400544375592373-76550250146951943062919149339056034643333836321487362389308928352353176555136344238443316360
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us-gaap:NetIncomeLossAttributableToNoncontrollingInterest ▄▂▂▁▂▂▃▂▃▂█▂▃▂▂▂▂▂▂▂▃▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂400-211212112121111111211111111011101111111NANANANA
 us-gaap:NetIncomeLossAttributableToNoncontrollingInterest dei:LegalEntity aep:SouthwesternElectricPowerCo▂▁▁▂▂▁▂▂▂▁█▁▂▁▂▂▂▁▂▁▂▁▂▂▂▁▂▂▂▁▁▂▂▁▂▂▂▁▁▂10011011101101011101010111011100110111001NANANANANA
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 us-gaap:NetIncomeLossAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents,dei:LegalEntity us-gaap:NoncontrollingInterest,aep:SouthwesternElectricPowerCo1NA011NA111NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:Assets ██▇▇▆▆▅▅▅▅▄▄▄▄▄▄▄▄▄▄▃▃▃▃▃▃▂▂▂▂▂▂▂▁▁▁▁▁7772475892739007255070722688026761766870656096472963964627396172863467614426331762486616836109960938600385963357925576205703856414549635497954550543675384353421529025222351187507525056050455NANANA48348NANANA
 us-gaap:Assets dei:LegalEntity aep:AEPTexasInc.██▇▆▅▄▃▃▁▁10570105891025510068985696039291919589008773NANANA7709NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Assets dei:LegalEntity aep:AEPTransmissionCo█▇▇▆▅▅▄▄▃▃▂▁1019998909352887986168394799875347239706865485943NA5349NANANA4156NANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:Assets dei:LegalEntity aep:AppalachianPowerCo██▇▇▇▇▆▇▆▆▆▆▆▆▅▅▅▅▄▄▄▄▄▄▄▄▂▂▂▂▂▂▂▂▁▁127931276812560124791252712290120571220412077119281212212093120051197711768117901170211648114061139411317112321120011195114141131010321103841041610507103201028210254102991018510038NA9997NANANANANANANA
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  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
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  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
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  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
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 us-gaap:NetCashProvidedByUsedInOperatingActivities dei:LegalEntity aep:AEPTransmissionCo▆█▇▄▆▄▆▄▄▅▆▇▁▅▄18722419012816612118011912715917720958143125NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInOperatingActivities dei:LegalEntity aep:AppalachianPowerCo▃▁▅▁▆▃█▅▅▄▇▃▇▅█▂▇▂▆▃█1548922595250155286204199177278164259214290131258105248137301NANANA297235207135236128167163230-3925913525088315NANANANANANA
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 us-gaap:ProfitLoss dei:LegalEntity aep:AEPTransmissionCo▇▅▆█▆▄▄▄▅▃▃▆▃▂▃▄▁117911071361047178708561591075739527425NANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:ProfitLoss dei:LegalEntity aep:AppalachianPowerCo▇▂▆▄█▅▆▅▇▅▆▄▇▅▆▅▇▅▅▄█▃▄▃▆▃▅▃▅▄▅▅▅▄▄▃▃▃▄▁115121045513377877712582865211065104731266574591412848361013062297056636275395231383550-19NANANANANA
 us-gaap:ProfitLoss dei:LegalEntity aep:IndianaMichiganPowerCo█▂▇▅█▃▆█▅▄▅▁▆▄▆▄▆▂▅▄▆▂▃▃▇▃▅▄▄▁▄▃▄▂▄▃▄▁▅▂9221886098297294644264106838755174245650721426278735574043103929392151314546214NANANANANA
 us-gaap:ProfitLoss dei:LegalEntity aep:OhioPowerCo▄▃▃▃▅▄▄▃▄▄▄▃▄▃▄▄▃▃▃▃▃▃▃▃▃▄▅▃▅▁▅▄▅▃▃▄▅█▄▃7549695012888886879928262863799747048714765455456608017821129-6015110115028467516531110037NANANANANA
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 us-gaap:ProfitLoss us-gaap:StatementBusinessSegments aep:TransmissionOperations▇▆▇█▇▅▄▅▆▄▄▇▄▄▄▅▃▃▃▄▃▃▃▃▂▂▂▂▁▁▁▁▁▁▁▁▁14111212715512592741011047776129725969954444466537374347242722181312148911964NANANANANANANANA
 us-gaap:ProfitLoss us-gaap:StatementBusinessSegments aep:VerticallyIntegratedUtilities▄▁█▃▆▂▆▅▄▃▅▂▄▃▆▄▅▂▅▄▅▁▄▃▅▃▃▃▃2466443817830313934527723216429712122015134321027811727520830058220155279173174153181NANANANANANANANANANANANANANANANA
 us-gaap:ProfitLoss us-gaap:StatementBusinessSegments,dei:LegalEntity aep:AEPTCoParent,aep:AEPTransmissionCo▆▄▄▅▄▅█▁▃500000.0300000.0300000.0400000.0100000.0400000.01000000.0-400000.00.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:ProfitLoss us-gaap:StatementBusinessSegments,dei:LegalEntity aep:StateTranscos,aep:AEPTransmissionCo▆▃▅█▅▁▂▂▂1179110713510471778284NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:ProfitLoss us-gaap:StatementEquityComponents,dei:LegalEntity us-gaap:RetainedEarnings,aep:AEPTransmissionCo117NA107136104NA788284NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:ProfitLoss us-gaap:StatementEquityComponents,dei:LegalEntity us-gaap:RetainedEarnings,aep:AppalachianPowerCo115NA10455133NA8777125NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:ProfitLoss us-gaap:StatementEquityComponents,dei:LegalEntity us-gaap:RetainedEarnings,aep:IndianaMichiganPowerCo92NA886098NA729464NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:ProfitLoss us-gaap:StatementEquityComponents,dei:LegalEntity us-gaap:RetainedEarnings,aep:OhioPowerCo75NA6950128NA886879NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:IncreaseDecreaseInInventories ▅▆▄▆▅▆▃▄▄▅▃▅▄▄▂▄▆█▄▄▂▆▄▄▁▄▂▅▄▅▄▅▆▆▂▄▂▅▂▅▃351312882678-67-2-2840-6822-13-48-1181195232-45-16-133120-152-209-50-13360155-307312699-129-25-12119-16912-83NANANANA
 us-gaap:IncreaseDecreaseInInventories dei:LegalEntity aep:AEPTexasInc.█▄▄▃▄▅▅▄▄▂▆▁▄700-113200-34-40NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IncreaseDecreaseInInventories dei:LegalEntity aep:AppalachianPowerCo▆█▅▇▆▇▄▅▄▅▅▅▆▅▄▆▇█▅▇▃▆▅▆▁▄▃▇▆▅▅▆██▃▄▂▆▂544-140925-320-19-8-13-76-14-3032842-1524-392-918-88-22-41278-3-1094552-47-23-6116-63NANANANANANA
 us-gaap:IncreaseDecreaseInInventories dei:LegalEntity aep:IndianaMichiganPowerCo▇▇▄▆▃▆▄▄▅▅▃▅▅▁▂▅▇▇▄▁▃▅▃▄▃▄▃▆▅█▂▃▆▄▂▂▃▅▂1617010-610-3043-1168-22-18316171-22-87-102-7-1-710626-15-5130-14-17-84-14NANANANANANA
 us-gaap:IncreaseDecreaseInInventories dei:LegalEntity aep:OhioPowerCo▆▆▅▆▆▆▅▅▅▆▅▆▅▆▅▅▆▆▅▆▆▆▅▆▅▅▁▅▅▆▄▇█▇▂▆▂▆▂106153701140512-303100775-221-1-69-1118-23304019-497-577-49NANANANANANA
 us-gaap:IncreaseDecreaseInInventories dei:LegalEntity aep:PublicServiceCoOfOklahoma█▄▅▅▂▄▄▄▄▄▁▂▂▂▂▅▅▄▄▃▄▆▃▂▄▃▂▅▃▄▆▃▃▆▂▅▄▅▁8022-310010-5-4-3-4-32310-115-2-30-2-42-104-1-15-4302-5NANANANANANA
 us-gaap:IncreaseDecreaseInInventories dei:LegalEntity aep:SouthwesternElectricPowerCo▄▆▃▃▅▃▃▃▃▆▂▄▂▂▁▃▁█▂▂▃▅▃▁▂▃▁▄▃▅▄▅▃▃▃▄▂▄▂728-13161-31-229-109-12-4-16-3-1347-12-120160-17-52-159-318111604113-46-7NANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▂▂▂▁▂▂▂▃▁▁▃▃█-1766-1786-1762-2012-1582-1664-1449-1311-1927-1933-1325-1241844NANANA-1138NANANA-1017NANANA-981-1298-877-871-772-1110-751-738-792-923-687-667-613-948-583-562-430NANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity aep:AEPTexasInc.▇▂▅▅▅▅▅▅▄█▁▆▆-120-536-272-327-336-328-272-324-364-32-671-176-195NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity aep:IndianaMichiganPowerCo▅▅▂▅▃█▆▁▃▁▂▃▄▂▃▅▃▄▆▇▄-152-162-211-154-191-105-139-225-185-222-200-189-179-208-197-161-193-171-131-115-175NANANA-17867-184-85-346-44-136-151-141-39-235-96-13974-180NANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity aep:PublicServiceCoOfOklahoma▇█▁▆▆▆▇▇▇▆▆▆▆█▅▄█▆▃▅▁-56-36-160-61-70-74-57-49-52-59-66-60-74-30-86-112-29-58-130-89-151NANANA-92-80-77-54-3824-35-130-5122-136-29-35-42-43NANANANANANA
 us-gaap:NetCashProvidedByUsedInInvestingActivities dei:LegalEntity aep:SouthwesternElectricPowerCo▅▅▅▅▆█▁▅▄▅▅▅▆▆▃▅▅▅▆▅▃-121-126-97-97-8323-608-98-145-126-100-818720-391-99-123-870-13-391NANANA-104-109-101-7628-171-176-186-159-158-118-155-39-104-77NANANANANANA
 us-gaap:PaymentsToAcquirePropertyPlantAndEquipment dei:LegalEntity aep:AEPTransmissionCo▁▁▂▁▂█▁▄▁▂▂▁▁115022401115300NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:PaymentsToAcquireInvestments ▅▄▅▁▁▃▄▄▄▃▄▆▄▄▅▅█▆▇▂▂▂▂▃▁▂▂▂▂▂▂▂▃▂▃▂▃▃▅▃▃6326247161051304765225435254585378125065476576451152793948295246297281345165234270227196302199193353297379191454376704393445NANANANA
 us-gaap:PaymentsToAcquireInvestments dei:LegalEntity aep:IndianaMichiganPowerCo▅▄▅▁▁▄▄▄▄▃▄▆▄▄▅▅█▆▇▂▂▂▂▃▁▂▂▂▂▂▂▂▃▂▃▂▂▂▄626615689961304755215425254585258115055476566441151792938294245296280344164234263227184301199192352295378186305285511NANANANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities █▅▄▆▅▄▄▄▆▅▄▄▁23888093131046693-11974177102970965307-1687NANANA352NANANA-213NANANA22203-61749-8454-302-88-19148-790-443114-808-2852756NANANANA
 us-gaap:NetCashProvidedByUsedInFinancingActivities dei:LegalEntity aep:AEPTransmissionCo▇▁▆▃▃▂▇▄▆▃█▃▅▅▃3454533014117776359197331158423133275271156NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:ProceedsFromIssuanceOfLongTermDebt ▆▅▄▇▆▆▆▆▄▅▇▅▁▅▄▂▃▃▂█▄▄▂▄▁▅▅▂▃▆▂▁▅▂▁▁▅▁▁▃▃1418104471814881285137313621368841111116929678210358162185255053281829774861267863761120114627067112563391291132210446010146940509652NANANANA
 us-gaap:ProceedsFromIssuanceOfLongTermDebt dei:LegalEntity aep:OhioPowerCo▆▁▁█▁▁▁▁▇▁▁▁▁3470044400003930000NANANANANANANANA00NANA401927NANA00000004914938NANANANANANA
us-gaap:RepaymentsOfLongTermDebt ▂▁▂▃▂▅▄▄▃▄▃▄▇▃▃▃▂▂▂█▂▂▂▅▂▂▇▂▅▄▃▁▂▁▂▃▄▃▁▄▄300197295507220822619795544660527657124248752346132226640414882392423338353703171208215858739417148339145257486777539113703638NANANANA
  2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
us-gaap:RepaymentsOfLongTermDebt ▂▁▂▃▂▅▄▄▃▄▃▄▇▃▃▃▂▂▂█▂▂▂▅▂▂▇▂▅▄▃▁▂▁▂▃▄▃▁▄▄300197295507220822619795544660527657124248752346132226640414882392423338353703171208215858739417148339145257486777539113703638NANANANA

Common Stock Value

us-gaap:CommonStockValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value335033433341334033383337333633353332332933283328332833283328332833253324332233213317331333123308330533033299329632913289328632843280327432713266326332573239
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.34.44.54.64.74.94.95.05.15.15.25.35.45.25.45.35.35.45.45.45.55.65.75.75.85.96.06.06.06.06.16.16.26.36.46.46.56.56.7

dei:LegalEntity

aep:AppalachianPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value260260260260260260260260260260260260260260260260260260260260260260260260260260260260260260260260260260260260260
Percentage of CommonStockValue7.87.87.87.87.87.87.87.87.87.87.87.87.87.87.87.87.87.87.87.87.97.97.97.97.97.97.97.97.97.97.97.97.98.08.08.08.0
Percentage of Assets0.30.30.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.50.50.50.50.50.50.50.50.50.50.50.50.50.5
Percentage of Assets aep:AppalachianPowerCo2.02.02.12.12.12.12.22.12.22.22.12.22.22.22.22.22.22.22.32.32.32.32.32.32.32.32.52.52.52.52.52.52.52.52.62.62.6

aep:IndianaMichiganPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value56565656565656565656565656565656565656565656565656565656565656565656565656
Percentage of CommonStockValue1.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.71.7
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of Assets aep:IndianaMichiganPowerCo0.50.50.50.50.50.60.60.60.60.60.60.60.60.60.60.60.60.60.70.70.70.70.70.70.70.70.70.70.70.70.70.70.80.80.80.80.8

aep:OhioPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value321321321321321321321321321321321321321321321321321321321321321321321321321321321321321321321321321321321321321
Percentage of CommonStockValue9.69.69.69.69.69.69.69.69.69.69.79.79.79.79.79.79.79.79.79.79.79.79.79.79.79.79.79.79.89.89.89.89.89.89.89.89.9
Percentage of Assets0.40.40.40.40.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.50.60.60.60.60.60.60.60.60.60.60.60.60.60.60.6
Percentage of Assets aep:OhioPowerCo3.94.04.24.24.34.34.54.54.44.44.64.54.64.54.84.84.64.54.64.64.54.44.84.84.74.52.62.52.52.52.52.52.52.53.83.83.7

aep:PublicServiceCoOfOklahoma



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value157157157157157157157157157157157157157157157157157157157157157157157157157157157157157157157157157157157157157
Percentage of CommonStockValue4.74.74.74.74.74.74.74.74.74.74.74.74.74.74.74.74.74.74.74.74.74.74.74.84.84.84.84.84.84.84.84.84.84.84.84.84.8
Percentage of Assets0.20.20.20.20.20.20.20.20.20.20.20.30.30.20.30.20.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.3
Percentage of Assets aep:PublicServiceCoOfOklahoma3.33.33.33.43.43.53.53.53.53.53.53.53.53.63.73.73.73.83.83.94.04.14.24.24.34.54.64.64.74.74.64.64.74.84.74.84.8

aep:SouthwesternElectricPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value135135135135135135135135135135135135135135135135135135135135135135135135135135135135135135135135135135135135135
Percentage of CommonStockValue4.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.14.24.2
Percentage of Assets0.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.20.30.30.30.30.30.30.3
Percentage of Assets aep:SouthwesternElectricPowerCo1.71.71.71.81.81.81.71.81.81.81.81.81.81.81.81.81.91.91.91.91.92.02.02.02.02.12.22.12.22.12.22.22.32.42.52.52.6

Common Stock Par Or Stated Value Per Share

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-312008-12-312007-12-31
Value515514514513513513513513512512512512512512512511511511511510510509509508508508507507506506505505504503503502502501498426421
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementEquityComponents

us-gaap:CommonStock



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-31
Value515514514514513513513513512512512512512512512512511511511511510510510509508508508507506506506505505504503502502501500500499498
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.099.9100.1100.1100.099.9100.0100.1100.099.9100.0100.1100.0100.1100.0100.099.9100.0100.00.00.00.099.9

Common Stock Shares Outstanding

Common Stock Shares Authorized

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value496495495494493493493493492492491491491490490489488488488487486486485484484482482481479479478
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value494493493493493492492491491491491491491490490489488488487486486485484484483482481481479479478
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value1.00.310000000000000051.490.931.160.731.171.070.920.82000000000000031.110.761.20.76-1.561.021.020.951.060.881.290.391.010.81.150.710.890.690.750.051.00.750.80.631.920.730.730.371.160.280.720.490.930.670.89
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value1.00.310000000000000051.480.931.160.73999999999999981.171.070.920.811.10.761.20.76-1.561.021.020.951.060.881.290.391.010.81.150.710.890.690.750.051.00.750.80.631.920.730.730.371.160.280.720.490.930.670.89
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Income Loss From Continuing Operations Per Basic Share

Income Loss From Continuing Operations Per Diluted Share

Revenue From Contract With Customer Including Assessed Tax

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value374736164315357340563801433340574038381041043576393337904652389240443614443239424708402643024044464837734176358238263613415635513625344443333609373034344064336035693282354732023458
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenues

us-gaap:Revenues



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value374736164315357340563801433340134048381041043576393337904652389240443614443239424708402643024044464837734176358238263613415635513625344443333609373034344064336035693282354732023458
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax100.0100.0100.0100.0100.0100.0100.098.9100.2100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

aep:AEPTexasInc.



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value423391489438390402433388371374431389343362403365330
Percentage of Revenues11.310.811.312.39.610.610.09.79.29.810.510.98.79.68.79.48.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax11.310.811.312.39.610.610.09.69.29.810.510.98.79.68.79.48.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTexasInc.0.00.00.00.0111.10.0106.4104.7104.90.00.00.00.00.00.00.00.0

aep:AEPTransmissionCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value29525125926624318919418319317316722915212012515379
Percentage of Revenues7.96.96.07.56.05.04.54.64.84.64.16.43.93.22.73.92.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax7.96.96.07.56.05.04.54.54.84.64.16.43.93.22.73.92.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTransmissionCo0.00.00.00.099.30.094.096.891.90.00.00.00.00.00.00.00.0

aep:AppalachianPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value749720755655792718762667820746719675792729778673820655727681899735709694913869849746951890864716805763858751831804840703
Percentage of Revenues20.019.917.518.419.518.917.616.620.319.617.518.920.219.216.717.320.318.116.417.319.118.316.517.219.723.020.320.824.924.720.820.222.222.219.820.822.323.420.720.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax20.019.917.518.419.518.917.616.420.319.617.518.920.219.216.717.320.318.116.417.319.118.316.517.219.723.020.320.824.924.720.820.222.222.219.820.822.323.420.720.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AppalachianPowerCo0.00.00.00.0100.60.099.798.099.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:IndianaMichiganPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value570538611543614574629589576535557467560514597522532487568544586531542533641595638549583544598510546521611521560524608509
Percentage of Revenues15.214.914.215.215.115.114.514.714.214.113.613.114.313.612.813.413.213.512.813.812.513.212.613.213.815.815.315.315.215.114.414.415.115.114.114.415.015.315.015.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax15.214.914.215.215.115.114.514.514.314.113.613.114.313.612.813.413.213.512.813.812.513.212.613.213.815.815.315.315.215.114.414.415.115.114.114.415.015.315.015.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:IndianaMichiganPowerCo0.00.00.00.099.20.0101.697.6100.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:OhioPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value69064371060683674577874879073174266374658887173076369278270591887183978688011461279110212331217135911131237121190777913942816855721
Percentage of Revenues18.417.816.517.020.619.618.018.719.519.218.118.619.015.518.718.818.919.117.717.919.521.619.519.418.930.430.630.832.233.732.731.434.135.220.921.637.482.021.121.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax18.417.816.517.020.619.618.018.519.619.218.118.619.015.518.718.818.919.117.717.919.521.619.519.418.930.430.630.832.233.732.731.434.135.220.921.637.482.021.121.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:OhioPowerCo0.00.00.00.0101.10.0105.098.4101.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:PublicServiceCoOfOklahoma



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value297307493348332330481398336335442344304273401300274292420319306314416318301297411324262242372317300289457328288281426327
Percentage of Revenues7.98.511.49.78.28.711.19.98.38.810.89.67.77.28.67.76.88.19.58.16.57.89.77.96.57.99.89.16.96.79.08.98.38.410.69.17.78.210.59.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax7.98.511.49.78.28.711.19.88.38.810.89.67.77.28.67.76.88.19.58.16.57.89.77.96.57.99.89.16.96.79.08.98.38.410.69.17.78.210.59.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:PublicServiceCoOfOklahoma0.00.00.00.099.60.0100.5101.4101.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:SouthwesternElectricPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value385408545375421410535457419436517424401402539427379378532438431424531449440428552420394352485390348356534399362338480361
Percentage of Revenues10.311.312.610.510.410.812.411.410.411.512.611.910.210.611.611.09.410.512.011.19.210.612.411.19.511.413.211.710.39.811.711.09.610.312.311.19.79.911.810.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax10.311.312.610.510.410.812.411.310.411.512.611.910.210.611.611.09.410.512.011.19.210.612.411.19.511.413.211.710.39.811.711.09.610.312.311.19.79.911.810.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo0.00.00.00.098.80.099.9100.699.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ConsolidationItems

srt:ConsolidationEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value-354-323-348-311-332-268-247-169-256-221-226
Percentage of Revenues-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-9.5-8.9-8.1-8.7-8.2-7.1-5.7-4.2-6.4-5.8-5.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax srt:ConsolidationEliminations0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementBusinessSegments

aep:AEPTransmissionHoldco



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-03-31
Value310264273278256198187212205156
Percentage of Revenues8.37.36.37.86.35.24.35.35.14.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax8.37.36.37.86.35.24.35.25.14.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTransmissionHoldco0.00.00.00.00.00.00.096.092.80.0

aep:GenerationAndMarketing



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value438429533412481452521460505407465410591694859683748606835801117078590191312518521001892920
Percentage of Revenues11.711.912.411.511.911.912.011.512.510.711.311.515.018.318.517.618.516.818.820.324.919.520.922.626.922.624.024.924.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax11.711.912.411.511.911.912.011.412.510.711.311.515.018.318.517.618.516.818.820.324.919.520.922.626.922.624.024.924.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:GenerationAndMarketing0.00.00.00.00.00.00.0100.7104.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:TransmissionAndDistributionCompanies



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value1106102811861045122211421211113711621106117310531086953127510961096103611891061127012341231113412151085119510641134
Percentage of Revenues29.528.427.529.330.130.028.028.328.729.028.629.527.625.227.428.227.128.726.826.927.030.728.628.026.128.828.629.729.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax29.528.427.529.330.130.028.028.028.829.028.629.527.625.227.428.227.128.726.826.927.030.728.628.026.128.828.629.729.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:TransmissionAndDistributionCompanies0.00.00.00.00.00.00.0100.4102.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:TransmissionOperations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value3102642732782561981872122051841782471561301321618884889958525557286087323112010
Percentage of Revenues8.37.36.37.86.35.24.35.35.14.84.36.94.03.42.84.22.22.32.02.51.21.31.31.40.61.60.20.20.10.10.10.00.00.10.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax8.37.36.37.86.35.24.35.25.14.84.36.94.03.42.84.22.22.32.02.51.21.31.31.40.61.60.20.20.10.10.10.00.00.10.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:TransmissionOperations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:VerticallyIntegratedUtilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value22262194264521232403225126362349240822982482212022902164255621252245201324712183250521962450225225862437273823022515
Percentage of Revenues59.460.761.359.459.259.260.958.559.560.360.559.358.257.154.954.655.555.755.855.453.254.557.055.755.664.665.664.365.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax59.460.761.359.459.259.260.957.959.660.360.559.358.257.154.954.655.555.755.855.453.254.557.055.755.664.665.664.365.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:VerticallyIntegratedUtilities0.00.00.00.00.00.00.099.099.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AllOtherSegments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value192224232523232324343128262624292425242426212622267943366556684105
Percentage of Revenues0.50.60.60.70.60.60.50.60.60.90.80.80.70.70.50.80.60.70.50.60.60.50.60.50.62.10.10.10.10.20.10.10.10.20.10.20.10.00.00.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.50.60.60.70.60.60.50.60.60.90.80.80.70.70.50.80.60.70.50.60.60.50.60.50.62.10.10.10.10.20.10.10.10.20.10.20.10.00.00.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:AllOtherSegments0.00.00.00.00.00.00.0111.7109.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementBusinessSegments, dei:LegalEntity

aep:StateTranscos, aep:AEPTransmissionCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value295251259266243189194200191
Percentage of Revenues7.96.96.07.56.05.04.55.04.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax7.96.96.07.56.05.04.54.94.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:StateTranscos aep:AEPTransmissionCo0.00.00.00.00.00.00.00.00.0

Sales Revenue Net

Cost Of Goods And Services Sold

us-gaap:ProductOrService

us-gaap:CostOfGoodsAndServicesSold

us-gaap:ElectricityGeneration



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value355278631480550450840566501481707
Percentage of CostOfGoodsAndServicesSold100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax9.57.714.613.513.611.819.414.012.412.617.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ElectricityGeneration192.60.0230.293.8186.80.0349.0164.40.00.00.0

us-gaap:ElectricityPurchased



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value795858783660861875784776990808718
Percentage of CostOfGoodsAndServicesSold224.0308.5124.2137.4156.6194.493.4137.0197.3168.0101.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax21.223.818.218.521.223.018.119.124.521.217.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ElectricityPurchased0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ProductOrService, dei:LegalEntity

us-gaap:ElectricityGeneration, aep:AEPTexasInc.



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value021189101358
Percentage of CostOfGoodsAndServicesSold0.00.71.81.81.72.41.61.01.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.10.30.20.20.30.30.10.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ElectricityGeneration aep:AEPTexasInc.0.00.00.00.00.00.00.00.00.0

us-gaap:ElectricityGeneration, aep:AppalachianPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1118517716118310126315569
Percentage of CostOfGoodsAndServicesSold31.230.828.133.533.322.531.327.413.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.02.44.14.54.52.76.13.81.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ElectricityGeneration aep:AppalachianPowerCo205.20.0251.8259.2271.60.0353.6273.40.0

us-gaap:ElectricityGeneration, aep:IndianaMichiganPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value532961425771957377
Percentage of CostOfGoodsAndServicesSold15.010.69.78.810.515.911.412.915.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.40.81.41.21.41.92.21.81.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ElectricityGeneration aep:IndianaMichiganPowerCo67.90.059.937.451.50.0102.551.70.0

us-gaap:ElectricityGeneration, aep:PublicServiceCoOfOklahoma



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1613984438291045848
Percentage of CostOfGoodsAndServicesSold4.85.015.69.36.96.412.410.49.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.50.42.31.30.90.82.41.41.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ElectricityGeneration aep:PublicServiceCoOfOklahoma889.50.0466.4772.4441.90.0835.2707.20.0

us-gaap:ElectricityGeneration, aep:SouthwesternElectricPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value8972148117133108152114126
Percentage of CostOfGoodsAndServicesSold25.126.123.624.524.324.218.120.225.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.42.03.43.33.32.93.52.83.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ElectricityGeneration aep:SouthwesternElectricPowerCo261.30.0293.5263.2233.40.0285.9205.60.0

us-gaap:ElectricityPurchased, aep:AppalachianPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value12213778641101528064205
Percentage of CostOfGoodsAndServicesSold34.549.412.413.420.133.99.611.441.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.33.81.81.82.74.01.91.65.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ElectricityPurchased aep:AppalachianPowerCo0.00.00.00.00.00.00.00.00.0

us-gaap:ElectricityPurchased, aep:IndianaMichiganPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value506944486954486355
Percentage of CostOfGoodsAndServicesSold14.124.87.110.212.612.05.811.111.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.31.91.01.41.71.41.11.61.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ElectricityPurchased aep:IndianaMichiganPowerCo0.00.00.00.00.00.00.00.00.0

us-gaap:ElectricityPurchased, aep:OhioPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value149153158121174149166162205
Percentage of CostOfGoodsAndServicesSold42.055.125.125.331.633.319.828.741.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax4.04.23.73.44.33.93.84.05.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ElectricityPurchased aep:OhioPowerCo0.00.00.00.00.00.00.00.00.0

us-gaap:ElectricityPurchased, aep:PublicServiceCoOfOklahoma



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value110118115102122127116113122
Percentage of CostOfGoodsAndServicesSold31.142.518.321.322.328.313.920.024.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.93.32.72.93.03.42.72.83.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ElectricityPurchased aep:PublicServiceCoOfOklahoma0.00.00.00.00.00.00.00.00.0

us-gaap:ElectricityPurchased, aep:SouthwesternElectricPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value436944333244365342
Percentage of CostOfGoodsAndServicesSold12.124.87.16.95.99.94.49.48.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.21.91.00.90.81.20.81.31.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ElectricityPurchased aep:SouthwesternElectricPowerCo0.00.00.00.00.00.00.00.00.0

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

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



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value511782112-9-5-4-1324
Percentage of CostOfGoodsAndServicesSold14.46.31.34.42.2-2.0-0.7-0.8-2.60.60.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.40.50.20.60.3-0.2-0.1-0.1-0.30.10.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ElectricityPurchased us-gaap:CommodityContract us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ProductOrService, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome

us-gaap:ElectricityPurchased, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value511782112-9-5-4-1324
Percentage of CostOfGoodsAndServicesSold14.46.31.34.42.2-2.0-0.7-0.8-2.60.60.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.40.50.20.60.3-0.2-0.1-0.1-0.30.10.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ElectricityPurchased us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.0

Operating Expenses

us-gaap:OperatingExpenses



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value29953321335630223268325036643256334230683118283128363214578030263152314834723133358435273377327736073095330130353071336432442810287131013443289228982948303929662811
Percentage of OperatingExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax79.991.977.884.680.685.584.680.382.880.576.079.272.184.8124.277.777.987.178.379.576.187.678.581.077.682.079.084.780.393.178.179.179.290.079.580.177.785.874.888.378.8

dei:LegalEntity

aep:AEPTexasInc.



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value334387371399319317339302289274302280261
Percentage of OperatingExpenses11.211.711.113.29.89.89.39.38.78.99.79.99.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax8.910.78.611.27.98.47.87.47.27.27.47.86.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTexasInc.0.00.00.00.090.90.083.381.581.80.00.00.00.0

aep:AEPTransmissionCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value1331291171051019897898076726462594845
Percentage of OperatingExpenses4.53.93.53.53.13.02.72.82.42.52.32.32.21.80.81.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.63.62.73.02.52.62.22.22.02.01.81.81.61.61.11.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTransmissionCo0.00.00.00.041.60.047.147.338.40.00.00.00.00.00.00.0

aep:AppalachianPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value578694612578640610712534627571546547572593573515575521569536625627579583693767702654786748721573636661735662715702728694
Percentage of OperatingExpenses19.320.918.319.219.618.819.416.418.818.617.519.320.218.59.917.018.316.616.417.117.517.817.217.819.224.821.321.625.622.322.220.422.221.321.422.924.723.824.023.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax15.419.214.216.215.816.016.413.215.515.013.315.314.615.712.313.214.214.412.913.613.315.613.514.414.920.316.818.320.620.717.416.117.619.217.018.419.220.517.920.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AppalachianPowerCo0.00.00.00.081.30.093.278.575.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:IndianaMichiganPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value453497503465499522519472479451442432441475466427416436464452461491480476495534536471502518517446469500510457464495492467
Percentage of OperatingExpenses15.115.015.015.415.316.114.214.514.314.714.215.315.614.88.114.113.213.913.414.512.913.914.214.513.717.316.315.616.415.416.015.916.416.114.815.816.016.816.215.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax12.113.811.713.012.313.712.011.611.911.810.812.111.212.510.011.010.312.110.511.59.812.211.211.810.714.212.813.213.114.412.512.613.014.511.812.712.514.412.113.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:IndianaMichiganPowerCo0.00.00.00.080.60.083.978.183.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:OhioPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value582580612529674627698644673586587544595523699592629641641609795772734672764984966102998812991080903967244583663610942232665632
Percentage of OperatingExpenses19.517.518.217.520.619.319.119.820.219.118.819.221.016.312.119.620.020.418.519.422.221.921.820.521.231.829.333.932.238.633.332.233.778.824.322.037.875.721.921.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax15.616.114.214.816.616.516.115.916.715.414.315.215.113.815.015.215.617.814.515.516.919.217.116.616.426.123.128.825.836.026.025.526.771.019.317.629.465.016.418.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:OhioPowerCo0.00.00.00.081.40.094.384.686.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:PublicServiceCoOfOklahoma



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value294306373291311327402341332314356298283268303241238274335264271287329269276274315266228220266248267254354264249266321288
Percentage of OperatingExpenses9.89.211.19.69.510.111.010.510.010.211.410.510.08.35.28.07.68.79.78.47.68.19.88.27.78.99.68.87.46.58.28.89.38.210.39.18.69.010.69.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax7.98.58.68.27.78.69.38.48.28.38.78.37.27.16.56.25.97.67.66.75.87.17.76.75.97.37.57.46.06.16.47.07.47.48.27.36.77.87.98.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:PublicServiceCoOfOklahoma0.00.00.00.093.40.084.186.999.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:SouthwesternElectricPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value350374410342367371408386377394380349347365392341327353391327339378398370375264500343343325365317293369406319308304352317
Percentage of OperatingExpenses11.711.312.211.311.211.411.111.911.312.912.212.312.311.46.811.310.411.211.310.59.510.711.811.310.48.515.211.311.29.711.311.310.211.911.811.010.610.311.610.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax9.410.49.59.69.09.89.49.59.410.39.39.88.89.78.48.88.19.88.88.37.29.49.39.28.17.012.09.69.09.08.89.08.110.79.48.98.38.98.79.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo0.00.00.00.086.10.076.285.190.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Operating Income Loss

us-gaap:OperatingIncomeLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value7512949585517885516687577067429867441097575-1127866892466960809112449992576710416788755477552499127417543438907178324861025394758481858682750
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax20.18.122.215.419.414.515.418.717.519.524.020.827.915.2-24.222.322.112.921.720.523.912.421.519.022.418.021.015.319.76.921.920.920.810.020.519.922.314.225.211.721.214.724.221.321.7

dei:LegalEntity

aep:AEPTexasInc.



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value89411838708494868197129109838111210382
Percentage of OperatingIncomeLoss11.81.512.37.09.015.314.111.411.613.113.114.77.614.1-10.011.99.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.40.12.71.11.72.22.22.12.02.53.23.12.12.12.42.72.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTexasInc.0.00.00.00.020.10.023.123.223.10.00.00.00.00.00.00.00.0

aep:AEPTransmissionCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value162122142161141919794112969516590607610834
Percentage of OperatingIncomeLoss21.641.514.929.218.016.614.512.415.913.19.622.28.210.6-6.812.53.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax4.33.43.34.53.52.42.22.32.82.52.34.62.31.61.62.80.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTransmissionCo0.00.00.00.057.70.046.949.653.50.00.00.00.00.00.00.00.0

aep:AppalachianPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value17125142761521084913219317417312722013620415824413315714527310713011022010114792164142142143169102122881161011129
Percentage of OperatingIncomeLoss22.88.714.914.019.319.67.417.527.323.617.517.120.123.6-18.118.327.428.716.518.024.321.514.114.421.115.016.916.821.857.115.619.422.429.813.812.413.921.010.92.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax4.60.73.32.23.72.81.13.34.84.64.23.65.63.64.44.16.03.73.63.75.82.73.02.74.72.73.52.64.33.93.44.04.73.02.82.53.13.02.80.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AppalachianPowerCo0.00.00.00.019.30.06.519.523.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:IndianaMichiganPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value11640107771155211011797841153511839131941155010391124396257146601027781268064762010064952911542
Percentage of OperatingIncomeLoss15.513.811.214.114.69.516.515.513.811.411.74.710.86.9-11.610.913.010.910.811.311.17.96.87.414.09.011.714.210.810.58.88.710.16.111.39.011.56.011.310.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.11.12.52.22.81.42.52.92.42.22.81.03.01.02.82.42.91.42.32.32.61.01.51.43.11.62.52.22.10.71.91.82.10.62.31.82.60.82.91.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:IndianaMichiganPowerCo0.00.00.00.018.60.017.819.416.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:OhioPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1076398771621187910411714515411915064171138134100140961229910411411516231273244-81279210269637014329958319089
Percentage of OperatingIncomeLoss14.321.410.314.020.621.412.013.816.619.615.716.113.711.2-15.216.015.021.514.711.910.919.911.314.911.124.035.713.432.4-32.830.628.335.818.57.920.036.0120.118.522.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.91.72.32.24.03.11.82.62.93.83.83.33.81.73.73.63.32.83.22.42.62.52.42.82.54.37.52.06.4-2.36.75.97.41.81.64.08.017.04.72.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:OhioPowerCo0.00.00.00.019.60.010.813.715.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:PublicServiceCoOfOklahoma



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value2112056202785732186462059859351884553427874825239558332110669333410364381510439
Percentage of OperatingIncomeLoss0.30.612.510.32.70.511.77.60.62.98.86.21.91.0-8.76.84.03.98.86.93.15.59.56.42.43.411.010.74.48.811.69.44.410.211.69.04.73.210.210.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.10.02.81.60.50.11.81.40.10.62.11.30.50.12.11.50.90.51.91.40.70.72.01.20.50.62.31.60.90.62.62.00.91.02.41.81.00.42.61.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:PublicServiceCoOfOklahoma0.00.00.00.06.30.016.414.61.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:SouthwesternElectricPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value353313433543812770414213775533614785512514111092451337864163527750271207255-1212880543312843
Percentage of OperatingIncomeLoss4.711.514.16.06.97.019.09.35.95.713.910.14.96.3-13.19.95.85.514.713.68.29.214.410.36.224.26.014.16.711.113.29.87.3-3.714.411.26.66.912.511.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.90.93.10.91.31.02.91.71.01.13.32.11.41.03.22.21.30.73.22.82.01.13.11.91.44.31.32.21.30.82.92.11.5-0.43.02.21.51.03.21.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo0.00.00.00.012.70.023.715.59.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Interest Expense

us-gaap:InterestExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value292290275250255251256242234227223222221210225224217214221224223223221221220221225228232291233235229210242239242249251249250
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax7.88.06.47.06.36.65.96.05.86.05.46.25.65.54.85.85.45.95.05.74.75.55.15.54.75.95.46.46.18.15.66.66.36.15.66.66.57.36.27.47.0

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-483680665
Percentage of OtherNonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.10.20.10.20.2-0.00.10.20.1

dei:LegalEntity

aep:IndianaMichiganPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312012-09-302012-06-302011-09-302011-06-302010-09-302010-06-30
Value223653644223345
Percentage of OtherNonoperatingIncomeExpense-56.835.4109.492.466.3-1266.796.873.180.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.10.10.10.20.10.10.10.10.10.00.10.10.10.10.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:IndianaMichiganPowerCo0.00.00.00.00.90.01.00.80.80.00.00.00.00.00.0

Income Loss From Continuing Operations

Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest

Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value46-4340-544421-807210217126419034360-5341652359227522533315126921530716425768195-162411901893233417427811325865207
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.2-1.20.9-1.51.10.6-1.91.82.54.56.45.38.71.6-11.54.25.82.66.25.77.13.86.35.36.64.36.21.95.1-0.45.85.45.20.97.74.87.53.36.31.95.8

Income Taxes Paid Net

us-gaap:IncomeTaxesPaidNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0-1632003-6134051467-88-2618741896284669-69-549-19-38-223-651-134132-25-417176-2
Percentage of IncomeTaxesPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-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

dei:LegalEntity

aep:AEPTexasInc.



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value0-391420-5228-220-5-24
Percentage of IncomeTaxesPaidNet-0.0237.7461.398.5933.3690.6-13.3-64.6-0.0-87.7-172.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.0-1.10.30.6-0.10.60.2-0.60.0-0.1-0.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTexasInc.0.00.00.00.0-1.60.02.0-6.00.00.00.0

aep:AEPTransmissionCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value0-281218-11-11-200-13-26-660-25-31
Percentage of IncomeTaxesPaidNet-16.7169.5400.091.6200.043.819.0-58.8-0.0-243.9-183.3-98.20.7937.0-530.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.0-0.80.30.5-0.00.0-0.3-0.50.0-0.4-0.6-1.9-0.0-0.7-0.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTransmissionCo0.00.00.00.0-0.50.0-5.7-10.70.00.00.00.00.00.00.0

aep:AppalachianPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value0423278-3971906-7320-332746-17-32850-62010-24-4002020-7-27-41-340-13-170
Percentage of IncomeTaxesPaidNet-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 RevenueFromContractWithCustomerIncludingAssessedTax0.00.10.50.80.2-1.00.20.50.00.2-0.20.90.0-0.90.61.2-0.4-0.10.60.10.0-0.20.50.00.0-0.6-0.10.00.00.60.5-0.2-0.10.2-0.9-0.90.0-0.4-4.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AppalachianPowerCo0.00.00.00.01.00.00.92.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:IndianaMichiganPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value0-361231-359-2-230-20-12-570-3-12-18-430151-8-141304-7-19-872-8-230-76-18-1-4-74
Percentage of IncomeTaxesPaidNet-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 RevenueFromContractWithCustomerIncludingAssessedTax0.0-1.00.30.9-0.11.6-0.1-0.60.0-0.5-0.3-1.60.0-0.1-0.3-0.5-0.10.10.00.40.0-0.2-0.30.30.00.1-0.2-0.5-0.20.20.1-0.2-0.6-0.0-1.8-0.5-0.0-0.1-1.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:IndianaMichiganPowerCo0.00.00.00.0-0.50.0-0.5-3.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:OhioPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value0-1811140-29450-21-7751424559722320028410054-1051-2361822-7391624132-137
Percentage of IncomeTaxesPaidNet-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 RevenueFromContractWithCustomerIncludingAssessedTax0.0-0.50.30.4-0.0-0.10.21.10.0-0.6-0.22.10.01.11.01.51.80.10.10.5-0.00.70.10.30.01.5-0.21.4-0.11.00.40.6-0.21.20.40.70.00.9-3.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:OhioPowerCo0.00.00.00.0-0.00.01.25.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:PublicServiceCoOfOklahoma



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value064100163-10-26-3-40-212-8-18-23-4840-20-2206-4609111410-26001-10
Percentage of IncomeTaxesPaidNet-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 RevenueFromContractWithCustomerIncludingAssessedTax0.00.20.10.30.00.40.1-0.00.0-0.7-0.1-1.1-0.10.3-0.2-0.5-0.6-0.10.20.10.0-0.5-0.10.10.00.2-0.10.20.00.30.30.00.10.3-0.60.00.00.1-0.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:PublicServiceCoOfOklahoma0.00.00.00.00.20.00.7-0.50.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:SouthwesternElectricPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value011605-3160-4-14-56034-37-431432100-138-6-80-3509-8-79-64-4818-1670-175
Percentage of IncomeTaxesPaidNet-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 RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.20.00.2-0.10.4-0.0-0.1-0.3-1.60.00.9-0.8-1.10.30.10.10.3-0.0-3.4-0.1-0.20.0-0.9-0.00.3-0.2-2.2-1.6-1.40.00.2-0.40.20.0-0.50.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo0.00.00.00.00.00.0-0.63.6-0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Profit Loss

us-gaap:ProfitLoss



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value499152733459574364579530456401556376594375-76450350347052043163119249439156134743433936421488363390311930353355178557137346239446317363
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax13.34.217.012.814.29.613.413.111.310.513.610.515.19.9-16.412.912.413.011.710.913.44.811.59.712.19.210.49.59.50.611.710.210.89.021.59.89.55.213.74.19.77.312.69.910.5

dei:LegalEntity

aep:AEPTexasInc.



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value47-13778034605746461636449335584933
Percentage of ProfitLoss9.5-9.010.517.66.016.510.08.810.240.811.613.05.614.9-1.19.76.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.3-0.41.82.30.81.61.31.11.24.31.61.40.81.50.21.30.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTexasInc.0.00.00.00.09.80.014.212.513.20.00.00.00.00.00.00.00.0

aep:AEPTransmissionCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value117911071361047178708561591075739527425
Percentage of ProfitLoss23.660.114.729.618.219.713.513.318.815.410.828.59.610.6-6.914.85.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.12.52.53.82.61.91.81.72.11.61.53.01.41.01.11.90.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTransmissionCo0.00.00.00.042.50.037.837.140.80.00.00.00.00.00.00.00.0

aep:AppalachianPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value115121045513377877712582865211065104731266574591412848361013062297056636275395231383550-19
Percentage of ProfitLoss23.18.414.212.123.321.315.014.627.520.615.413.818.617.4-13.614.625.113.914.313.722.514.99.99.318.28.714.48.819.4269.912.917.219.312.75.79.011.020.29.0-14.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.10.42.41.63.32.02.01.93.12.22.11.52.81.72.21.93.11.81.71.53.00.71.10.92.20.81.50.81.81.61.51.82.11.11.20.91.01.01.2-0.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AppalachianPowerCo0.00.00.00.017.00.011.411.415.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:IndianaMichiganPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value9221886098297294644264106838755174245650721426278735574043103929392151314546214
Percentage of ProfitLoss18.514.012.113.117.28.112.517.914.110.711.72.811.510.3-9.910.214.85.310.911.711.57.65.47.015.510.213.312.011.948.48.08.210.16.85.68.912.82.311.210.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.50.62.11.72.40.81.72.31.61.11.60.31.71.01.61.31.80.71.31.31.50.40.60.71.90.91.41.11.10.30.90.81.10.61.20.91.20.11.50.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:IndianaMichiganPowerCo0.00.00.00.016.00.011.715.711.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:OhioPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value7549695012888886879928262863799747048714765455456608017821129-6015110115028467516531110037
Percentage of ProfitLoss15.032.49.411.022.324.215.313.017.423.114.816.614.510.0-13.114.814.010.213.811.110.423.510.914.510.823.141.26.235.7-286.831.027.938.79.25.021.446.8174.918.127.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.01.41.61.43.22.32.01.72.02.42.01.72.21.02.11.91.71.31.61.21.41.11.31.41.32.14.30.63.4-1.73.62.94.20.81.12.14.49.12.51.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:OhioPowerCo0.00.00.00.015.50.012.09.010.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:PublicServiceCoOfOklahoma



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value-10-10100416-66036-70462042522815744271310452284512813858351220573115-25515
Percentage of ProfitLoss-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 RevenueFromContractWithCustomerIncludingAssessedTax-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:PublicServiceCoOfOklahoma0.00.00.00.01.90.012.69.3-2.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:SouthwesternElectricPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value16141117291089381311842517168444247825946147432221047301121895436-387512978126
Percentage of ProfitLoss3.29.615.21.65.12.915.57.32.92.715.16.72.94.4-11.08.84.91.615.813.87.47.415.18.44.130.01.88.93.2104.818.315.19.3-1.19.414.58.44.114.719.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.40.42.60.20.70.32.11.00.30.32.00.70.40.41.81.10.60.21.91.51.00.41.70.80.52.80.20.80.30.62.11.51.0-0.12.01.40.80.22.00.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo0.00.00.00.06.80.016.78.53.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementBusinessSegments

aep:GenerationAndMarketing



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value30-29885397253818-80332618650-1369497069182187-111179816340112-985
Percentage of ProfitLoss6.1-19.012.11.16.820.00.97.34.0-20.06.17.031.313.5179.29.914.11.317.519.029.6-5.723.725.129.111.525.8-2.723.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.8-0.82.10.11.01.90.11.00.4-2.10.80.74.71.3-29.41.31.70.22.12.14.0-0.32.72.43.51.12.7-0.32.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:GenerationAndMarketing0.00.00.00.00.00.00.08.43.70.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:TransmissionAndDistributionCompanies



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value116291331311561421451141252621441111199415512410863113789776929097771197587
Percentage of ProfitLoss23.319.318.228.627.339.125.021.527.565.225.929.620.025.1-20.324.721.513.521.718.115.439.618.623.017.322.227.422.123.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.10.83.13.73.93.83.42.83.16.93.53.13.02.53.33.22.71.82.52.02.11.92.12.22.12.02.82.12.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:TransmissionAndDistributionCompanies0.00.00.00.00.00.00.010.111.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:TransmissionOperations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value14111212715512592741011047776129725969954444466537374347242722181312148911964
Percentage of ProfitLoss28.473.717.333.821.825.212.819.222.919.213.734.312.315.9-9.118.98.99.58.815.15.919.38.712.04.37.85.15.33.657.12.92.22.33.51.01.71.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.83.12.94.33.12.41.72.52.62.01.93.61.91.61.52.41.11.21.01.60.80.91.01.20.50.70.50.50.30.30.30.20.20.30.20.20.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:TransmissionOperations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:VerticallyIntegratedUtilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value2466443817830313934527723216429712122015134321027811727520830058220155279173174153181
Percentage of ProfitLoss49.342.459.738.952.938.259.652.451.040.853.432.337.140.4-44.941.855.424.952.948.347.530.244.539.649.749.940.145.149.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax6.61.810.25.07.53.78.06.85.84.37.23.45.64.07.45.46.93.26.25.36.41.45.13.86.04.64.24.34.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:VerticallyIntegratedUtilities0.00.00.00.00.00.00.011.79.70.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AllOtherSegments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value-35-25-53-11-50-829-2-24-215-11-41936231254-9-3-1011-2-5240104-3-77-6-8-11-8-10-13-31-352-1
Percentage of ProfitLoss-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-0.9-0.7-1.2-0.3-1.2-2.20.2-0.1-0.6-0.60.1-0.3-0.10.50.80.60.07.0-0.2-0.1-0.00.00.3-0.0-0.10.60.02.9-0.1-2.1-0.1-0.2-0.3-0.2-0.2-0.4-0.8-1.00.0-0.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:AllOtherSegments0.00.00.00.00.00.00.0-10.8-110.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementBusinessSegments, dei:LegalEntity

aep:AEPTCoParent, aep:AEPTransmissionCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value500000.0300000.0300000.0400000.0100000.0400000.01000000.0-400000.00.0
Percentage of ProfitLoss0.10.20.00.10.00.10.2-0.10.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.00.00.00.0-0.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTCoParent aep:AEPTransmissionCo0.00.00.00.00.00.00.00.00.0

aep:StateTranscos, aep:AEPTransmissionCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1179110713510471778284
Percentage of ProfitLoss23.559.914.629.518.219.513.315.518.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.12.52.53.82.61.91.82.02.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:StateTranscos aep:AEPTransmissionCo0.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents, dei:LegalEntity

us-gaap:RetainedEarnings, aep:AEPTexasInc.



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value47778034574646
Percentage of ProfitLoss9.510.517.66.010.08.810.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.31.82.30.81.31.11.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:RetainedEarnings aep:AEPTexasInc.0.00.00.00.00.00.00.0

us-gaap:RetainedEarnings, aep:AEPTransmissionCo



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value117107136104788284
Percentage of ProfitLoss23.614.729.618.213.515.518.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.12.53.82.61.82.02.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:RetainedEarnings aep:AEPTransmissionCo0.00.00.00.00.00.00.0

us-gaap:RetainedEarnings, aep:AppalachianPowerCo



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value115104551338777125
Percentage of ProfitLoss23.114.212.123.315.014.627.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.12.41.63.32.01.93.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:RetainedEarnings aep:AppalachianPowerCo0.00.00.00.00.00.00.0

us-gaap:RetainedEarnings, aep:IndianaMichiganPowerCo



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value92886098729464
Percentage of ProfitLoss18.512.113.117.212.517.914.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.52.11.72.41.72.31.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:RetainedEarnings aep:IndianaMichiganPowerCo0.00.00.00.00.00.00.0

us-gaap:RetainedEarnings, aep:OhioPowerCo



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value756950128886879
Percentage of ProfitLoss15.09.411.022.315.313.017.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.01.61.43.22.01.72.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:RetainedEarnings aep:OhioPowerCo0.00.00.00.00.00.00.0

us-gaap:RetainedEarnings, aep:PublicServiceCoOfOklahoma



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-101004166036-7
Percentage of ProfitLoss-2.113.79.11.110.46.9-1.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.32.31.20.21.40.9-0.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:RetainedEarnings aep:PublicServiceCoOfOklahoma0.00.00.00.00.00.00.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value426193776381542329586529455508530384577362-793518494450512431624193492395566532440331394138508359387221911363362
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax11.45.418.010.713.48.713.513.011.313.312.910.714.79.6-17.113.312.212.511.610.913.34.811.49.812.214.110.59.210.33.812.210.110.76.421.010.19.7

dei:LegalEntity

aep:SouthwesternElectricPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value1518110627690371115732416148343234815846137332221117291030895433-9755129
Percentage of ComprehensiveIncomeNetOfTax3.59.314.21.75.12.015.57.12.63.113.86.42.94.1-10.58.44.80.915.913.67.47.015.08.13.920.91.78.92.822.217.515.28.7-4.28.314.18.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.40.52.60.20.70.22.10.90.30.41.80.70.40.41.81.10.60.11.81.51.00.31.70.80.52.90.20.80.30.82.11.50.9-0.31.81.40.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo0.00.00.00.06.50.016.98.32.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value400-21121211212111111121111111101110111
Percentage of ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.1-0.00.0-0.10.00.00.00.00.10.00.30.00.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

dei:LegalEntity

aep:SouthwesternElectricPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value10011011101101011101010111011100110111
Percentage of ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest24.4-62.5200.0-50.092.364.366.764.769.618.291.750.050.044.468.861.157.958.2101.395.651.685.3110.9112.6110.280.4105.8105.6109.00.095.5106.1108.30.0102.3103.6108.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.00.00.00.00.00.00.00.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo0.00.00.00.00.30.00.30.20.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value430192776379543330588530458509542385579364-792519496451513432626194493396567533441332395138509360388221912364363161565129356
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax11.55.318.010.613.48.713.613.111.313.413.210.814.79.6-17.013.412.312.511.611.013.34.811.59.812.214.110.69.310.33.812.210.110.76.421.010.19.74.713.93.810.0

dei:LegalEntity

aep:AEPTexasInc.



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value47-1277803459584647165644933
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest11.1-6.410.021.36.418.09.98.810.332.411.912.85.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax1.3-0.31.82.30.91.61.31.21.24.31.61.40.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AEPTexasInc.0.00.00.00.09.90.014.312.613.30.00.00.00.0

aep:AppalachianPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value110251035413274867612493855111061103721255873581413148361016063307280656375255333403850
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest25.613.213.314.424.422.514.614.427.218.415.813.419.016.8-13.114.025.313.014.413.622.616.09.99.117.911.414.39.118.358.612.917.719.511.65.89.111.124.08.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.90.72.41.53.32.02.01.93.12.52.11.42.81.62.21.93.11.61.71.53.00.81.10.92.21.61.50.81.92.21.61.82.10.71.20.91.11.11.2
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:AppalachianPowerCo0.00.00.00.016.90.011.311.215.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:IndianaMichiganPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value92228960992973956446651068387551752156507214272787445841461439224116473246462
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest21.511.711.516.018.38.912.417.914.19.012.02.811.910.4-9.69.915.14.811.111.811.77.45.57.015.48.413.212.411.810.27.76.310.87.75.28.812.72.811.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.50.62.11.72.40.81.72.31.61.21.60.31.71.01.61.31.90.61.31.31.50.40.60.71.91.21.41.21.20.40.90.61.20.51.10.91.20.11.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:IndianaMichiganPowerCo0.00.00.00.016.00.011.815.811.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:OhioPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value75496850127888868799282628637997469477147654453566014818123134-38156104152219130145168296101
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest17.425.68.913.223.526.715.012.917.318.215.216.114.810.2-12.614.314.110.613.911.010.423.010.914.210.627.941.17.234.0-27.730.829.139.399.214.339.946.5184.118.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax2.01.41.61.43.12.32.01.72.02.42.01.72.21.02.11.91.71.31.61.21.41.11.21.41.33.94.30.73.5-1.13.83.04.26.43.04.04.58.62.5
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:OhioPowerCo0.00.00.00.015.40.011.99.010.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:PublicServiceCoOfOklahoma



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-10-11100416-66036-70462042522815644261310442284502813758341220563114655
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest-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 RevenueFromContractWithCustomerIncludingAssessedTax-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:PublicServiceCoOfOklahoma0.00.00.00.01.80.012.69.2-2.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:SouthwesternElectricPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value1618111729792381315842517158444244825947147433231128301231905534-8775230682
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest3.79.614.32.05.42.215.67.32.93.115.56.53.04.3-10.78.65.01.116.013.87.57.415.28.44.121.01.99.23.122.617.715.49.0-3.98.414.38.44.114.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.40.52.60.20.70.22.11.00.30.42.10.70.40.41.81.10.60.11.91.51.00.41.70.80.53.00.20.90.30.92.21.61.0-0.31.81.40.80.22.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo0.00.00.00.06.80.017.28.53.20.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss

Net Income Loss Available To Common Stockholders Basic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312009-09-302009-06-302009-03-31
Value495153733461572363577528454400544375592373-76550250146951943062919149339056034643333836321487362389308928352353176555136344238443316360
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax13.24.217.012.914.19.613.313.011.310.513.310.515.19.9-16.512.912.413.011.710.913.44.711.59.612.09.210.49.49.50.611.710.210.78.921.49.89.55.113.74.09.67.312.59.910.4

dei:LegalEntity

aep:SouthwesternElectricPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1514110627988371110732416158343237815845137331211036291021885335-486492868025
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic3.09.215.11.34.92.615.37.12.62.713.46.52.84.2-10.98.64.71.515.613.67.37.014.98.13.929.91.68.62.9102.318.114.99.1-1.59.314.28.13.614.618.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.40.42.60.20.70.32.00.90.30.31.80.70.40.41.81.10.60.21.81.51.00.31.70.80.52.70.20.80.30.62.11.51.0-0.12.01.40.80.22.00.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo0.00.00.00.06.50.016.58.32.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-302015-09-30
Value495733461572363577528454400544373-765518
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.099.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax13.217.012.914.19.613.313.011.310.513.39.9-16.511.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents, dei:LegalEntity

us-gaap:RetainedEarnings, aep:SouthwesternElectricPowerCo



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value15110627883711
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic3.015.11.34.915.37.12.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.42.60.20.72.00.90.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:RetainedEarnings aep:SouthwesternElectricPowerCo0.00.00.00.00.00.00.0

Net Income Loss Attributable To Noncontrolling Interest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value400-211212112121111111211111111011101111111
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.1-0.00.0-0.10.00.00.00.00.10.00.30.00.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

dei:LegalEntity

aep:SouthwesternElectricPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value10011011101101011101010111011100110111001
Percentage of NetIncomeLossAttributableToNoncontrollingInterest24.4-62.5200.0-50.092.364.366.764.769.618.291.750.050.044.468.861.157.958.2101.395.651.685.3110.9112.6110.280.4105.8105.6109.00.095.5106.1108.30.0102.3103.6108.289.577.4127.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.00.00.00.00.00.00.00.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax aep:SouthwesternElectricPowerCo0.00.00.00.00.30.00.30.20.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:NoncontrollingInterest



Period End2020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value40-21121211212111111121111111101110111
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.10.0-0.10.00.00.00.00.10.00.30.00.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents, dei:LegalEntity

us-gaap:NoncontrollingInterest, aep:SouthwesternElectricPowerCo



Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value1011111
Percentage of NetIncomeLossAttributableToNoncontrollingInterest24.4200.0-50.092.366.764.769.6
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:NoncontrollingInterest aep:SouthwesternElectricPowerCo0.00.00.00.00.00.00.0

Assets

us-gaap:Assets



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value777247589273900725507072268802676176687065609647296396462739617286346761442633176248661683610996093860038596335792557620570385641454963549795455054367538435342152902522235118750752505605045548348
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

aep:AEPTexasInc.



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value105701058910255100689856960392919195890087737709
Percentage of Assets13.614.013.913.913.914.013.713.813.613.612.1
Percentage of Assets13.614.013.913.913.914.013.713.813.613.612.1
Percentage of Assets aep:AEPTexasInc.100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aep:AEPTransmissionCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312015-12-31
Value101999890935288798616839479987534723970686548594353494156
Percentage of Assets13.113.012.712.212.212.211.811.311.010.910.29.58.46.7
Percentage of Assets13.113.012.712.212.212.211.811.311.010.910.29.58.46.7
Percentage of Assets aep:AEPTransmissionCo100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aep:AppalachianPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value1279312768125601247912527122901205712204120771192812122120931200511977117681179011702116481140611394113171123211200111951141411310103211038410416105071032010282102541029910185100389997
Percentage of Assets16.516.817.017.217.717.917.818.318.418.419.019.319.418.919.218.618.718.918.718.718.818.819.319.420.020.018.818.919.119.319.219.219.419.719.919.819.8
Percentage of Assets16.516.817.017.217.717.917.818.318.418.419.019.319.418.919.218.618.718.918.718.718.818.819.319.420.020.018.818.919.119.319.219.219.419.719.919.819.8
Percentage of Assets aep:AppalachianPowerCo100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aep:IndianaMichiganPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value109051123710997109491077010222101081005498449772976795919454934190719048887887108629868786468665832983238260825381878138805978317670758574997392719371317148
Percentage of Assets14.014.814.915.115.214.914.915.015.015.115.315.315.314.714.814.314.214.114.114.314.414.514.414.414.514.614.914.814.814.414.214.214.214.214.114.114.2
Percentage of Assets14.014.814.915.115.214.914.915.015.015.115.315.315.314.714.814.314.214.114.114.314.414.514.414.414.514.614.914.814.814.414.214.214.214.214.114.114.2
Percentage of Assets aep:IndianaMichiganPowerCo100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aep:OhioPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value818280437620763575187435711871927356726170557091699570936664666969467137694569997210727066946735689771611255612655127601298512976129191293913024842185168747
Percentage of Assets10.510.610.310.510.610.810.510.811.211.211.011.311.311.210.810.511.111.611.411.512.012.211.611.712.112.722.823.023.423.924.124.224.524.916.516.817.3
Percentage of Assets10.510.610.310.510.610.810.510.811.211.211.011.311.311.210.810.511.111.611.411.512.012.211.611.712.112.722.823.023.423.924.124.224.524.916.516.817.3
Percentage of Assets aep:OhioPowerCo100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aep:PublicServiceCoOfOklahoma



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value4778475147694665459245324513453545254508447844934451437942914278419341704114401639453813370637053631352634323405337933253411342333383280332232643284
Percentage of Assets6.16.36.56.46.56.66.76.86.97.07.07.27.26.97.06.86.76.86.76.66.66.46.46.46.46.36.26.26.26.16.36.46.36.36.56.46.5
Percentage of Assets6.16.36.56.46.56.66.76.86.97.07.07.27.26.97.06.86.76.86.76.66.66.46.46.46.46.36.26.26.26.16.36.46.36.36.56.46.5
Percentage of Assets aep:PublicServiceCoOfOklahoma100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aep:SouthwesternElectricPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value7944783277677743768276287987749374237342755575467533762675987340729971487101718371896816672466626650656162506350629963416180603858675601548654295243
Percentage of Assets10.210.310.510.710.911.111.811.211.311.311.812.012.212.012.411.611.711.611.611.812.011.411.611.611.711.611.411.611.511.711.511.311.110.710.710.710.4
Percentage of Assets10.210.310.510.710.911.111.811.211.311.311.812.012.212.012.411.611.711.611.611.812.011.411.611.611.711.611.411.611.511.711.511.311.110.710.710.710.4
Percentage of Assets aep:SouthwesternElectricPowerCo100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems

srt:ConsolidationEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-312016-12-31
Value-3923-3801-3737-3251-2874-2714-3398-3022-2417
Percentage of Assets-5.0-5.0-5.1-4.5-4.1-3.9-5.0-4.7-3.8
Percentage of Assets-5.0-5.0-5.1-4.5-4.1-3.9-5.0-4.7-3.8
Percentage of Assets srt:ConsolidationEliminations100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, dei:LegalEntity

srt:ConsolidationEliminations, aep:AEPTransmissionCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value-3513-3493-3599-3237-2896-2869-2594
Percentage of Assets-4.5-4.6-4.9-4.5-4.1-4.2-4.0
Percentage of Assets-4.5-4.6-4.9-4.5-4.1-4.2-4.0
Percentage of Assets srt:ConsolidationEliminations aep:AEPTransmissionCo100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

aep:GenerationAndMarketing



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value321631233315279519601979236922842123200919041905219433863176543754005414553156685706632962806301635464266664
Percentage of Assets4.14.14.53.92.82.93.53.43.23.13.03.03.65.35.28.68.68.89.19.39.510.610.810.911.111.412.3
Percentage of Assets4.14.14.53.92.82.93.53.43.23.13.03.03.65.35.28.68.68.89.19.39.510.610.810.911.111.412.3
Percentage of Assets aep:GenerationAndMarketing100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aep:TransmissionAndDistributionCompanies



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value188921875717967177691741917083163991638416272160601576515092148131480214155141671434114640144411435114403144951382213859138991416513516
Percentage of Assets24.324.724.324.524.624.824.324.524.824.824.624.124.023.323.022.423.023.723.623.624.024.323.924.124.425.124.9
Percentage of Assets24.324.724.324.524.624.824.324.524.824.824.624.124.023.323.022.423.023.723.623.624.024.323.924.124.425.124.9
Percentage of Assets aep:TransmissionAndDistributionCompanies100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aep:TransmissionOperations



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value114841114310606100889543912786668141763170246721638457805432515250124362403637363575300027022460224518091588140912161008865727594230
Percentage of Assets14.814.714.413.913.913.513.012.611.911.210.910.19.48.68.28.17.16.66.26.05.24.74.34.03.32.92.62.21.91.61.41.10.5
Percentage of Assets14.814.714.413.913.913.513.012.611.911.210.910.19.48.68.28.17.16.66.26.05.24.74.34.03.32.92.62.21.91.61.41.10.5
Percentage of Assets aep:TransmissionOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aep:VerticallyIntegratedUtilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value410204122840746404304008538874388133842237913375793813637914375623742836924366393619735792352723531635075337503307233024329973279132008
Percentage of Assets52.854.355.155.756.756.557.457.557.858.159.660.460.959.060.157.957.958.057.758.058.456.657.157.357.958.158.9
Percentage of Assets52.854.355.155.756.756.557.457.557.858.159.660.460.959.060.157.957.958.057.758.058.456.657.157.357.958.158.9
Percentage of Assets aep:VerticallyIntegratedUtilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllOtherSegments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value7033544050024719434140364306407145523959223392114721233203542177222302219622190721810215992140221081207062037920275196451787418155177951719116885166381639716751162881597415942
Percentage of Assets9.07.26.86.56.15.96.46.16.96.134.933.734.432.135.435.235.135.535.735.435.635.435.735.435.534.832.533.032.631.631.431.131.032.131.831.531.6
Percentage of Assets9.07.26.86.56.15.96.46.16.96.134.933.734.432.135.435.235.135.535.735.435.635.435.735.435.534.832.533.032.631.631.431.131.032.131.831.531.6
Percentage of Assets us-gaap:AllOtherSegments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments, dei:LegalEntity

aep:AEPTCoParent, aep:AEPTransmissionCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value3562351935893218292828572590
Percentage of Assets4.64.64.94.44.14.24.0
Percentage of Assets4.64.64.94.44.14.24.0
Percentage of Assets aep:AEPTCoParent aep:AEPTransmissionCo100.0100.0100.0100.0100.0100.0100.0

aep:StateTranscos, aep:AEPTransmissionCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value10150986593638897858484067086
Percentage of Assets13.113.012.712.312.112.210.9
Percentage of Assets13.113.012.712.312.112.210.9
Percentage of Assets aep:StateTranscos aep:AEPTransmissionCo100.0100.0100.0100.0100.0100.0100.0

Liabilities

us-gaap:Liabilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value575985587053765530015137849634484704802447010464034585044884440154604744099449124434443778433904349642790428094105341035406194032839200394423912939130385373841338045375583647436753367213677335147
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets74.173.672.873.172.672.171.771.871.771.771.771.571.372.671.870.971.071.071.071.471.371.870.971.271.271.571.371.771.772.071.671.971.971.971.372.472.672.972.7

dei:LegalEntity

aep:AEPTexasInc.



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value75617628728271727041702368706832658466036052
Percentage of Liabilities13.113.713.513.513.714.114.214.214.014.213.1
Percentage of Assets9.710.19.99.910.010.210.210.210.010.29.5
Percentage of Assets aep:AEPTexasInc.71.572.071.071.271.473.173.974.374.075.378.5

aep:AEPTransmissionCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value5887588154355069494248244582439644834462418136543392
Percentage of Liabilities10.210.510.19.69.69.79.59.29.59.69.18.17.4
Percentage of Assets7.67.77.47.07.07.06.86.66.86.96.55.85.3
Percentage of Assets aep:AEPTransmissionCo57.759.558.157.157.457.557.358.361.963.163.961.563.4

aep:AppalachianPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value8561859583888385843882848086827881878124838184088342839382168266817681737946794678647865784478678102808172337318734274557314730672927363721771937157
Percentage of Liabilities14.915.415.615.816.416.716.717.217.417.518.318.719.018.218.618.418.418.718.318.318.418.419.119.219.920.018.518.618.819.119.019.019.219.619.819.619.5
Percentage of Assets11.011.311.411.611.912.012.012.412.512.613.113.413.513.213.413.113.113.313.013.013.113.213.513.714.214.313.213.313.513.713.613.713.814.114.114.214.2
Percentage of Assets aep:AppalachianPowerCo66.967.366.867.267.467.467.167.867.868.169.169.569.570.169.870.169.970.269.769.769.570.070.070.371.071.470.170.570.570.970.971.171.171.570.971.771.6

aep:IndianaMichiganPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value8289869384558476833778697765774675987554756474227265718969266948679766746584666966496711636563606275633162856272622160275855578457095631542253885446
Percentage of Liabilities14.415.615.716.016.215.916.016.116.216.316.516.516.515.615.715.515.315.215.215.315.515.715.515.515.415.716.015.915.915.415.215.115.015.014.914.714.8
Percentage of Assets10.711.511.411.711.811.411.511.611.611.711.811.811.811.311.311.010.910.810.810.911.111.311.011.011.011.211.411.411.411.110.910.810.810.810.610.610.8
Percentage of Assets aep:IndianaMichiganPowerCo76.077.476.977.477.477.076.877.077.277.377.477.476.877.076.476.876.676.676.376.876.977.576.476.476.076.776.877.177.277.076.376.376.176.275.475.676.2

aep:OhioPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value5620553551615245511851384909495950794951483749564856497645834688496551514937499352035290493450285236553679698146817584598337836184128574530953515562
Percentage of Liabilities9.89.99.69.910.010.410.110.310.810.710.611.011.010.810.410.411.211.811.411.512.212.412.012.312.913.720.320.720.921.621.621.822.122.814.614.615.1
Percentage of Assets7.27.37.07.27.27.57.37.47.77.67.67.97.97.87.57.47.98.48.18.28.78.98.58.79.29.814.514.815.015.615.515.715.916.410.410.511.0
Percentage of Assets aep:OhioPowerCo68.768.867.768.768.169.169.068.969.068.268.669.969.470.268.870.371.572.271.171.472.272.873.774.775.977.363.564.464.165.164.364.765.065.863.062.863.6

aep:PublicServiceCoOfOklahoma



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value3414337833843381334932843246331533293293324632893249316530753114305730503001294729032785268827322681258424652474246324082473251324482387242524032436
Percentage of Liabilities5.96.06.36.46.56.66.76.97.17.17.17.37.46.97.06.96.97.06.96.86.86.56.56.76.66.46.36.36.36.26.46.56.46.46.66.56.6
Percentage of Assets4.44.54.64.74.74.84.85.05.15.15.15.25.35.05.04.94.94.94.94.84.84.74.64.74.74.64.54.54.54.44.64.74.64.64.74.74.8
Percentage of Assets aep:PublicServiceCoOfOklahoma71.571.171.072.572.972.571.973.173.673.072.573.273.072.371.772.872.973.172.973.473.673.072.573.873.873.371.872.772.972.472.573.473.372.873.073.674.2

aep:SouthwesternElectricPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value5486539153445431535753125673524951975108529853455329541153685163513649784906504150764719461546024597450542744350429843204189413640203788365836773571
Percentage of Liabilities9.59.69.910.210.410.711.710.911.111.011.611.912.111.812.211.511.611.411.311.611.911.011.211.211.311.210.911.011.011.010.910.810.610.110.010.09.7
Percentage of Assets7.17.17.27.57.67.78.47.97.97.98.38.58.68.58.78.28.28.18.08.38.57.98.08.08.18.07.87.97.97.97.87.77.67.37.17.27.1
Percentage of Assets aep:SouthwesternElectricPowerCo69.168.868.870.169.769.671.070.170.069.670.170.870.771.070.670.370.469.669.170.270.669.268.669.169.168.768.468.568.268.167.868.568.567.666.767.768.1

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value777247589273900725507072268802676176687065609647296396462739617286346761442633176248661683610996093860038596335792557620570385641454963549795455054367538435342152902522235118750752505605045548348
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

dei:LegalEntity

aep:AEPTexasInc.



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value105701058910255100689856960392919195890087737709
Percentage of LiabilitiesAndStockholdersEquity13.614.013.913.913.914.013.713.813.613.612.1
Percentage of Assets13.614.013.913.913.914.013.713.813.613.612.1
Percentage of Assets aep:AEPTexasInc.100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aep:AEPTransmissionCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value10199989093528879861683947998753472397068654859435349
Percentage of LiabilitiesAndStockholdersEquity13.113.012.712.212.212.211.811.311.010.910.29.58.4
Percentage of Assets13.113.012.712.212.212.211.811.311.010.910.29.58.4
Percentage of Assets aep:AEPTransmissionCo100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aep:AppalachianPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value1279312768125601247912527122901205712204120771192812122120931200511977117681179011702116481140611394113171123211200111951141411310103211038410416105071032010282102541029910185100389997
Percentage of LiabilitiesAndStockholdersEquity16.516.817.017.217.717.917.818.318.418.419.019.319.418.919.218.618.718.918.718.718.818.819.319.420.020.018.818.919.119.319.219.219.419.719.919.819.8
Percentage of Assets16.516.817.017.217.717.917.818.318.418.419.019.319.418.919.218.618.718.918.718.718.818.819.319.420.020.018.818.919.119.319.219.219.419.719.919.819.8
Percentage of Assets aep:AppalachianPowerCo100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aep:IndianaMichiganPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value109051123710997109491077010222101081005498449772976795919454934190719048887887108629868786468665832983238260825381878138805978317670758574997392719371317148
Percentage of LiabilitiesAndStockholdersEquity14.014.814.915.115.214.914.915.015.015.115.315.315.314.714.814.314.214.114.114.314.414.514.414.414.514.614.914.814.814.414.214.214.214.214.114.114.2
Percentage of Assets14.014.814.915.115.214.914.915.015.015.115.315.315.314.714.814.314.214.114.114.314.414.514.414.414.514.614.914.814.814.414.214.214.214.214.114.114.2
Percentage of Assets aep:IndianaMichiganPowerCo100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aep:OhioPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value818280437620763575187435711871927356726170557091699570936664666969467137694569997210727066946735689771611255612655127601298512976129191293913024842185168747
Percentage of LiabilitiesAndStockholdersEquity10.510.610.310.510.610.810.510.811.211.211.011.311.311.210.810.511.111.611.411.512.012.211.611.712.112.722.823.023.423.924.124.224.524.916.516.817.3
Percentage of Assets10.510.610.310.510.610.810.510.811.211.211.011.311.311.210.810.511.111.611.411.512.012.211.611.712.112.722.823.023.423.924.124.224.524.916.516.817.3
Percentage of Assets aep:OhioPowerCo100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aep:PublicServiceCoOfOklahoma



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value4778475147694665459245324513453545254508447844934451437942914278419341704114401639453813370637053631352634323405337933253411342333383280332232643284
Percentage of LiabilitiesAndStockholdersEquity6.16.36.56.46.56.66.76.86.97.07.07.27.26.97.06.86.76.86.76.66.66.46.46.46.46.36.26.26.26.16.36.46.36.36.56.46.5
Percentage of Assets6.16.36.56.46.56.66.76.86.97.07.07.27.26.97.06.86.76.86.76.66.66.46.46.46.46.36.26.26.26.16.36.46.36.36.56.46.5
Percentage of Assets aep:PublicServiceCoOfOklahoma100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

aep:SouthwesternElectricPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value7944783277677743768276287987749374237342755575467533762675987340729971487101718371896816672466626650656162506350629963416180603858675601548654295243
Percentage of LiabilitiesAndStockholdersEquity10.210.310.510.710.911.111.811.211.311.311.812.012.212.012.411.611.711.611.611.812.011.411.611.611.711.611.411.611.511.711.511.311.110.710.710.710.4
Percentage of Assets10.210.310.510.710.911.111.811.211.311.311.812.012.212.012.411.611.711.611.611.812.011.411.611.611.711.611.411.611.511.711.511.311.110.710.710.710.4
Percentage of Assets aep:SouthwesternElectricPowerCo100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value197281963219716192591919619028190161872218483182871806917824176871739717321183861812617891176991743417241168201686816581164161608515762155371542115237153061500714856146641465313939137791362213140
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets25.425.926.726.527.127.728.128.028.228.328.228.428.727.428.229.029.029.029.028.628.728.229.128.828.828.528.728.328.328.028.428.128.128.128.627.527.327.027.2

dei:LegalEntity

aep:SouthwesternElectricPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value2457244024222312232423152313224322252234224622012203221422292176216221692194214121122096210820592052205519751999200020211990190118471813182317471666
Percentage of StockholdersEquity12.512.412.312.012.112.212.212.012.012.212.412.312.512.712.911.811.912.112.412.312.312.512.512.412.512.812.512.913.013.313.012.712.412.412.412.512.2
Percentage of Assets3.23.23.33.23.33.43.43.43.43.53.53.53.63.53.63.43.53.53.63.53.53.53.63.63.63.63.63.63.73.73.73.63.53.53.63.43.3
Percentage of Assets aep:SouthwesternElectricPowerCo30.931.231.229.930.330.429.029.930.030.429.729.229.329.029.329.629.630.330.929.829.430.831.430.930.931.331.631.531.831.932.231.531.532.433.232.231.8

Assets Current

us-gaap:AssetsCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value529240774166406139144113469245704135425340673809361660335949443841464072454842254116447841114323433543104317462243974589464844834214418243744754478950164756
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets6.85.45.65.65.56.06.96.86.36.66.46.15.99.59.77.06.66.67.46.96.97.57.17.57.67.67.98.48.18.48.68.48.08.08.59.49.59.99.8

dei:LegalEntity

aep:AEPTexasInc.



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value463692548486404476437495435563389
Percentage of AssetsCurrent8.817.013.212.010.311.69.310.810.513.36.5
Percentage of Assets0.60.90.70.70.60.70.60.70.70.90.6
Percentage of Assets aep:AEPTexasInc.4.46.55.34.84.15.04.75.44.96.45.0

aep:AEPTransmissionCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value252197389194203225413220214327450165178
Percentage of AssetsCurrent4.84.89.34.85.25.58.84.85.27.711.14.43.0
Percentage of Assets0.30.30.50.30.30.30.60.30.30.50.70.30.3
Percentage of Assets aep:AEPTransmissionCo2.52.04.22.22.42.75.22.93.04.66.92.83.3

aep:AppalachianPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value641700614650800698630764713636552603580591576625625627573630727678623636878803704746773812740747694743757942950
Percentage of AssetsCurrent12.117.214.816.020.417.013.416.717.215.013.615.816.09.89.714.115.115.412.614.917.715.215.214.720.318.616.316.217.617.715.916.716.517.817.319.818.9
Percentage of Assets0.80.90.80.91.11.00.91.11.11.00.91.00.90.90.91.01.01.00.91.01.21.11.11.11.51.41.31.41.41.51.41.41.31.41.51.91.9
Percentage of Assets aep:AppalachianPowerCo5.05.54.95.26.45.75.26.35.95.34.65.04.84.94.95.35.35.45.05.56.46.05.65.77.77.16.87.27.47.77.27.36.87.27.49.49.5

aep:IndianaMichiganPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value392403414427403430483565448434393372418419397456457455399435395476415467526586779787819722843807732694684592698
Percentage of AssetsCurrent7.49.99.910.510.310.510.312.410.810.29.79.811.67.06.710.311.011.28.810.39.610.610.110.812.213.618.117.018.615.718.118.017.416.615.612.513.9
Percentage of Assets0.50.50.60.60.60.60.70.80.70.70.60.60.70.70.60.70.70.70.70.70.70.80.70.80.91.01.41.41.51.31.61.51.41.31.31.21.4
Percentage of Assets aep:IndianaMichiganPowerCo3.63.63.83.93.74.24.85.64.64.44.03.94.44.54.45.05.15.24.65.04.65.55.05.66.47.19.59.710.29.211.010.69.89.49.58.39.8

aep:OhioPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value265238230318277319353403530397252283206270218224447573544492701736386414521807774911914110310319479661135819798939
Percentage of AssetsCurrent5.05.85.57.87.17.87.58.812.89.46.27.45.74.53.75.110.814.112.011.717.016.59.49.612.018.717.919.720.824.122.221.122.927.118.716.818.7
Percentage of Assets0.30.30.30.40.40.50.50.60.80.60.40.50.30.40.40.40.70.90.90.81.21.20.70.70.91.41.41.71.72.01.91.81.82.21.61.61.9
Percentage of Assets aep:OhioPowerCo3.23.03.04.23.74.35.05.67.25.53.64.02.93.83.33.46.48.07.87.09.710.15.86.27.611.36.27.27.28.58.07.37.58.79.79.410.7

aep:PublicServiceCoOfOklahoma



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value143188263194145157169192182205191216209195193209171245281234236191187219190174170181178174268280214208289235279
Percentage of AssetsCurrent2.74.66.34.83.73.83.64.24.44.84.75.75.83.23.34.74.16.06.25.65.74.34.65.14.44.04.03.94.13.85.86.35.15.06.65.05.6
Percentage of Assets0.20.20.40.30.20.20.30.30.30.30.30.30.30.30.30.30.30.40.50.40.40.30.30.40.30.30.30.30.30.30.50.50.40.40.60.50.6
Percentage of Assets aep:PublicServiceCoOfOklahoma3.04.05.54.23.23.53.84.24.04.64.34.84.74.54.54.94.15.96.95.86.05.05.15.95.24.95.05.35.35.27.98.26.46.48.77.28.5

aep:SouthwesternElectricPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value346354373384346414842363348380322341380546594354368335375554656429464500560566484491471595500475381273287360404
Percentage of AssetsCurrent6.58.79.09.58.810.118.08.08.48.97.99.010.59.010.08.08.98.28.313.116.09.611.311.612.913.111.210.610.713.010.810.69.06.56.67.68.1
Percentage of Assets0.40.50.50.50.50.61.20.50.50.60.50.50.60.91.00.60.60.50.60.91.10.70.80.91.01.00.90.90.91.10.90.90.70.50.60.70.8
Percentage of Assets aep:SouthwesternElectricPowerCo4.44.54.85.04.55.410.54.94.75.24.34.55.17.27.84.85.04.75.37.79.16.36.97.58.48.67.77.77.59.48.17.96.54.95.26.67.7

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value15542463482102272347882111832143431721752102122461901761781951901631941902921181471171792794432972862215464176252941090838818490411178
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.00.30.50.30.30.31.20.30.30.30.50.30.30.30.30.40.30.30.30.30.30.30.30.30.50.20.30.20.30.50.80.60.50.41.10.81.20.60.00.00.01.00.00.0

dei:LegalEntity

aep:AEPTexasInc.



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value03000300020
Percentage of CashAndCashEquivalentsAtCarryingValue0.01.30.00.00.01.30.00.00.10.90.3
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets aep:AEPTexasInc.0.00.00.00.00.00.00.00.00.00.00.0

aep:AppalachianPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-312008-12-31
Value233224221222323562223223424213121221202121
Percentage of CashAndCashEquivalentsAtCarryingValue0.21.31.01.11.31.80.31.30.71.40.81.51.71.31.62.23.41.61.41.32.11.61.41.71.62.32.82.30.71.30.40.70.61.00.50.40.40.30.20.20.40.5
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets aep:AppalachianPowerCo0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:IndianaMichiganPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-312008-12-31
Value122112110111111231111111211101000110000000
Percentage of CashAndCashEquivalentsAtCarryingValue0.10.80.70.70.71.00.20.70.30.60.40.60.70.60.81.01.70.60.70.70.90.60.70.90.81.11.20.90.30.60.20.30.20.50.20.10.10.10.10.10.20.2
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets aep:IndianaMichiganPowerCo0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:OhioPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-312008-12-31
Value3342343313323346933342344342131212112010113
Percentage of CashAndCashEquivalentsAtCarryingValue0.21.51.31.31.42.10.41.60.81.40.91.31.71.51.92.64.91.81.81.82.31.82.02.41.62.53.02.20.61.30.40.80.60.90.30.30.40.10.10.10.43.3
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets aep:OhioPowerCo0.00.00.10.00.00.10.00.00.00.00.00.00.00.00.10.10.10.00.00.00.10.00.10.10.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

aep:PublicServiceCoOfOklahoma



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-312008-12-31
Value112112110121112331111111112101110120001101
Percentage of CashAndCashEquivalentsAtCarryingValue0.10.60.80.70.70.90.20.80.30.70.60.80.70.70.91.31.70.80.90.70.70.80.90.90.61.11.40.90.30.50.20.40.30.60.40.20.10.20.10.10.20.3
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets aep:PublicServiceCoOfOklahoma0.00.00.10.00.00.00.00.00.00.00.00.00.00.00.00.10.10.00.00.00.00.00.00.00.00.00.10.00.00.00.00.00.00.00.10.00.00.00.00.00.00.0

aep:SouthwesternElectricPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-312008-12-31
Value11212422242201211010151412514871423161717171172161418052411111
Percentage of CashAndCashEquivalentsAtCarryingValue0.10.66.111.49.710.50.31.00.40.70.61.05.94.97.25.76.52.98.04.14.28.812.48.96.214.612.010.14.00.73.84.96.30.41.10.50.70.50.20.20.30.5
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets aep:SouthwesternElectricPowerCo0.00.00.30.30.30.30.00.00.00.00.00.00.10.10.20.20.20.10.20.10.10.20.40.30.30.30.30.20.10.00.30.20.30.00.10.00.00.00.00.00.00.0

Short Term Investments

us-gaap:ShortTermInvestments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value185202198175168159164163167161310317275331279306264386315356293386318377310353288298261324278297217294240311296416363
Percentage of ShortTermInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.30.30.20.20.20.20.20.30.20.50.50.40.50.50.50.40.60.50.60.50.60.50.70.50.60.50.50.50.60.50.60.40.60.50.60.60.80.8

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value163187193168159152157155
Percentage of ShortTermInvestments88.392.697.596.194.296.095.796.1
Percentage of Assets0.20.20.30.20.20.20.20.2
Percentage of Assets srt:Subsidiaries0.00.00.00.00.00.00.00.0

Accounts Receivable Net Current

us-gaap:AccountsReceivableNetCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value174117051825178118821926211822701851189117401661171119161880181516501640185319201889192618551926194318601856193118691871185517621670183418601866174919231050
Percentage of AccountsReceivableNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.22.22.52.52.72.83.13.42.82.92.72.62.83.03.12.92.62.73.03.23.13.23.23.33.43.33.43.53.43.43.43.33.23.53.63.73.53.82.2

dei:LegalEntity

aep:AEPTexasInc.



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value227193246243204196220261192194170
Percentage of AccountsReceivableNetCurrent13.111.313.513.610.910.210.411.510.410.38.9
Percentage of Assets0.30.30.30.30.30.30.30.40.30.30.3
Percentage of Assets aep:AEPTexasInc.2.21.82.42.42.12.12.42.82.22.22.2

aep:AEPTransmissionCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value107858411188728610512311312211477
Percentage of AccountsReceivableNetCurrent6.15.04.66.34.73.84.14.66.76.07.06.94.1
Percentage of Assets0.10.10.10.20.10.10.10.20.20.20.20.20.1
Percentage of Assets aep:AEPTransmissionCo1.10.90.91.31.00.91.11.41.71.61.91.91.5

aep:AppalachianPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value254250224224264283275308278263196211238235208204214187210223232239193214266309259248313320268259262363292335417
Percentage of AccountsReceivableNetCurrent14.614.712.312.614.114.713.013.615.014.011.312.813.912.311.111.313.011.511.411.612.312.410.411.113.716.714.012.916.817.114.514.715.719.815.718.021.7
Percentage of Assets0.30.30.30.30.40.40.40.50.40.40.30.30.40.40.30.30.30.30.30.40.40.40.30.40.50.50.50.50.60.60.50.50.50.70.60.70.8
Percentage of Assets aep:AppalachianPowerCo2.02.01.81.82.12.32.32.52.32.21.61.82.02.01.81.71.81.61.82.02.12.11.71.92.32.72.52.43.03.12.62.52.63.52.93.34.2

aep:IndianaMichiganPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value1011099310712714314016311211594791101139611911511512513499131103117139163141155142164173167169199176179254
Percentage of AccountsReceivableNetCurrent5.86.45.16.06.87.46.67.26.16.15.44.86.55.95.26.67.07.06.87.05.36.85.66.17.28.87.68.17.68.89.49.510.110.99.59.613.2
Percentage of Assets0.10.10.10.10.20.20.20.20.20.20.10.10.20.20.20.20.20.20.20.20.20.20.20.20.20.30.30.30.30.30.30.30.30.40.30.40.5
Percentage of Assets aep:IndianaMichiganPowerCo0.91.00.91.01.21.41.41.61.11.21.00.81.21.21.11.31.31.31.51.51.11.51.21.41.72.01.71.91.82.12.32.22.32.72.42.53.6

aep:OhioPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value153132116135172202221226130169124120108138103103117112133138169174164146179144249282322379312277246341245242313
Percentage of AccountsReceivableNetCurrent8.87.86.47.69.110.510.510.07.08.97.17.36.47.25.55.77.16.87.27.29.09.08.97.69.27.813.414.617.320.316.815.814.818.613.213.016.3
Percentage of Assets0.20.20.20.20.20.30.30.30.20.30.20.20.20.20.20.20.20.20.20.20.30.30.30.30.30.30.50.50.60.70.60.50.50.70.50.50.6
Percentage of Assets aep:OhioPowerCo1.91.61.51.82.32.73.13.11.82.31.81.71.62.01.61.61.71.61.92.02.42.42.52.22.62.02.02.22.52.92.42.21.92.62.92.83.6

aep:PublicServiceCoOfOklahoma



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value484956776364727562695252415845574449596251566569516554655961606887715880112
Percentage of AccountsReceivableNetCurrent2.82.93.14.43.43.33.43.33.43.73.03.22.43.12.43.22.73.03.23.32.82.93.53.62.63.52.93.43.23.33.33.95.23.93.24.35.9
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.20.10.10.20.2
Percentage of Assets aep:PublicServiceCoOfOklahoma1.01.01.21.71.41.41.61.71.41.51.21.20.91.31.11.41.11.21.41.61.31.51.81.91.41.91.61.91.81.81.82.02.62.21.82.53.4

aep:SouthwesternElectricPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value647592101697281103971258072719476908588106123821089711312013410691879992907177858594
Percentage of AccountsReceivableNetCurrent3.74.45.15.73.73.83.94.65.36.64.64.34.14.94.15.05.25.45.76.44.45.75.35.96.27.25.74.84.75.35.05.14.34.24.64.64.9
Percentage of Assets0.10.10.10.10.10.10.10.20.10.20.10.10.10.10.10.10.10.10.20.20.10.20.20.20.20.20.20.20.20.20.20.20.10.10.20.20.2
Percentage of Assets aep:SouthwesternElectricPowerCo0.81.01.21.30.91.01.01.41.31.71.11.00.91.21.01.21.21.21.51.71.21.61.51.71.82.01.71.41.41.61.51.51.21.41.61.61.8

Other Assets Current

Prepaid Expense And Other Assets Current

us-gaap:PrepaidExpenseAndOtherAssetsCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value219242262233200208186243280310350224141325148145136172156210148278177229159246262337241241209179185165173172145
Percentage of PrepaidExpenseAndOtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.30.30.40.30.30.30.30.40.40.50.50.40.20.50.20.20.20.30.30.30.20.50.30.40.30.40.50.60.40.40.40.30.30.30.30.30.3

dei:LegalEntity

aep:AEPTexasInc.



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value656345123533
Percentage of PrepaidExpenseAndOtherAssetsCurrent3.02.42.41.52.42.56.41.52.11.21.1
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets aep:AEPTexasInc.0.10.10.10.00.00.10.10.00.10.00.0

aep:AEPTransmissionCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value33432331227872
Percentage of PrepaidExpenseAndOtherAssetsCurrent1.61.61.71.41.41.61.95.11.02.42.33.30.9
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets aep:AEPTransmissionCo0.00.00.00.00.00.00.00.20.00.10.10.10.1

aep:AppalachianPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value336436293344238111218121091713211727181613253733161516171819182121232935
Percentage of PrepaidExpenseAndOtherAssetsCurrent15.126.413.812.716.921.212.33.54.04.15.25.77.23.011.79.515.710.117.78.611.44.914.216.221.26.76.14.87.17.89.410.511.713.213.917.324.7
Percentage of Assets0.00.10.00.00.00.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.10.10.00.00.00.00.00.00.00.00.00.00.10.1
Percentage of Assets aep:AppalachianPowerCo0.30.50.30.20.30.40.20.10.10.10.20.10.10.10.10.10.20.10.20.20.10.10.20.30.30.10.20.20.20.20.20.20.20.20.20.30.4

aep:IndianaMichiganPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value16141616232420231320261923195048504227281727252827383971626260414535333433
Percentage of PrepaidExpenseAndOtherAssetsCurrent7.55.86.47.011.711.811.29.74.96.77.78.516.86.133.833.337.424.417.713.612.110.114.412.417.515.515.021.325.826.029.023.024.421.519.619.923.3
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.10.10.10.10.00.00.00.00.00.00.00.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of Assets aep:IndianaMichiganPowerCo0.20.10.20.10.20.20.20.20.10.20.30.20.30.20.60.50.60.50.30.30.20.30.30.30.30.50.50.90.80.80.80.50.60.50.50.50.5

aep:OhioPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value23191914151516282715282012111618121111898667775032262633294241253133
Percentage of PrepaidExpenseAndOtherAssetsCurrent10.87.97.56.17.57.38.911.69.75.18.09.28.93.411.012.88.96.47.14.16.23.23.62.64.531.619.29.711.011.115.916.423.225.214.818.123.4
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.10.10.10.00.00.10.10.10.10.00.10.1
Percentage of Assets aep:OhioPowerCo0.30.20.30.20.20.20.20.40.40.20.40.30.20.20.20.30.20.20.20.10.10.10.10.10.11.10.40.30.20.20.30.20.30.30.30.40.4

aep:PublicServiceCoOfOklahoma



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value131211101298778147561076674156965664578561315149
Percentage of PrepaidExpenseAndOtherAssetsCurrent6.15.04.44.46.34.54.33.22.72.84.13.44.11.87.35.44.93.84.72.310.42.35.23.03.82.52.61.42.53.23.82.93.78.28.98.56.5
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets aep:PublicServiceCoOfOklahoma0.30.30.20.20.30.20.20.20.20.20.30.20.10.10.30.20.20.20.20.10.40.20.20.20.20.20.20.10.20.20.20.20.20.40.50.40.3

aep:SouthwesternElectricPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value34292423312232424035352638352124272120233725262124201812171623252516212424
Percentage of PrepaidExpenseAndOtherAssetsCurrent15.712.39.39.815.610.617.117.314.311.410.111.827.610.914.217.120.412.312.911.425.79.314.79.515.68.57.13.87.56.811.314.513.710.212.714.216.7
Percentage of Assets0.00.00.00.00.00.00.00.10.10.10.10.00.10.10.00.00.00.00.00.00.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets aep:SouthwesternElectricPowerCo0.40.40.30.30.40.30.40.60.50.50.50.30.50.50.30.30.40.30.30.30.50.40.40.30.40.30.30.20.30.30.40.40.40.30.40.50.5

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value804177914577452756427415173085711977001268796674286543864134629106203660599670826643065481648266460265306643056312362065610946028559044583575807557454574595678456223556705509754669540965374051684
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets103.5104.3104.8104.3104.8106.2105.3104.7104.9104.2102.3102.2101.997.798.6105.9106.3106.2106.1106.0108.8107.8109.0107.7107.1106.9107.4106.1106.5105.7106.7106.3106.3106.6107.6107.7107.0106.5106.9

dei:LegalEntity

aep:AEPTexasInc.



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value108551060310330100939906964392859026872984197322
Percentage of PropertyPlantAndEquipmentGross13.513.413.313.313.413.213.012.912.712.511.8
Percentage of Assets14.014.014.013.914.014.013.713.513.313.011.5
Percentage of Assets aep:AEPTexasInc.102.7100.1100.7100.2100.5100.499.998.298.196.095.0

aep:AEPTransmissionCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value10221989392678907856782687761742671086780606756905054
Percentage of PropertyPlantAndEquipmentGross12.712.512.011.811.611.310.910.610.310.19.38.98.1
Percentage of Assets13.213.012.512.312.112.011.511.110.810.59.59.18.0
Percentage of Assets aep:AEPTransmissionCo100.2100.099.1100.399.498.597.098.698.295.992.695.794.5

aep:AppalachianPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value15653155141529215088149051479214591144571429414141139041372113576134621324413106129621283212721126241313313005128761277612671125871146611403113721130611187110631098010907107751036410239
Percentage of PropertyPlantAndEquipmentGross19.519.619.719.920.120.220.520.620.821.021.221.421.621.721.919.519.519.619.619.520.120.220.420.620.720.919.419.519.619.719.519.519.519.619.619.019.1
Percentage of Assets20.120.420.720.821.121.521.621.621.821.821.721.922.021.221.620.720.720.820.820.721.921.822.222.222.222.320.920.720.820.820.820.720.820.921.120.420.3
Percentage of Assets aep:AppalachianPowerCo122.4121.5121.7120.9119.0120.4121.0118.5118.4118.6114.7113.5113.1112.4112.5111.2110.8110.2111.5110.8116.1115.8115.0114.1111.0111.3111.1109.8109.2107.6108.4107.6107.1105.9105.8103.2102.4

aep:IndianaMichiganPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value10273101941011310011988997629350925191999074892688448663863285328477834182218323822588938826866885668453835582018132801679607649762175977584758275277395
Percentage of PropertyPlantAndEquipmentGross12.812.913.113.213.313.413.113.213.413.513.613.813.813.914.112.612.612.612.812.713.613.713.713.813.813.913.913.913.813.913.313.413.513.613.813.813.8
Percentage of Assets13.213.413.713.814.014.213.813.814.014.014.014.114.013.613.913.413.313.313.613.514.814.815.014.914.814.814.914.814.714.614.214.314.414.514.814.814.7
Percentage of Assets aep:IndianaMichiganPowerCo94.290.792.091.491.895.592.592.093.492.991.492.291.692.494.193.794.094.496.594.7102.9101.9104.1102.9102.3101.2100.299.999.5101.699.7100.5101.3102.6105.4105.5103.4

aep:OhioPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value932791708953878186198493833381788060795177637641752074417319725071757103707169956899680166876592650764381524915143154111533516189160711599115897101491031210263
Percentage of PropertyPlantAndEquipmentGross11.611.611.611.611.611.611.711.711.711.811.911.912.012.012.110.810.810.810.910.810.610.610.610.610.710.725.825.926.526.728.228.328.428.618.418.919.1
Percentage of Assets12.012.112.112.112.212.312.312.212.312.312.112.212.211.711.911.511.511.511.611.511.511.411.511.411.411.427.727.528.328.230.130.130.230.419.820.320.3
Percentage of Assets aep:OhioPowerCo114.0114.0117.5115.0114.6114.2117.1113.7109.6109.5110.0107.7107.5104.9109.8108.7103.399.5101.899.995.793.599.997.994.389.9121.4119.7120.8118.1124.8124.4123.6122.1120.5121.1117.3

aep:PublicServiceCoOfOklahoma



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value5756568355965527547354395394535453175279524052035148509550394995511950454998492948444760466645924549448943804324426042184172412240824057403640273975
Percentage of PropertyPlantAndEquipmentGross7.27.27.27.37.47.47.67.67.77.88.08.18.28.28.37.47.77.77.77.67.47.47.47.47.47.47.47.47.37.37.37.37.37.37.37.47.4
Percentage of Assets7.47.57.67.67.77.98.08.08.18.28.28.38.38.08.27.98.28.28.28.18.18.08.18.08.08.08.07.97.87.87.77.77.77.87.97.97.9
Percentage of Assets aep:PublicServiceCoOfOklahoma120.5119.6117.4118.5119.2120.0119.5118.1117.5117.1117.0115.8115.7116.4117.4116.8122.1121.0121.5122.7122.8124.8125.9123.9125.3127.3127.6127.0126.0126.9122.3120.4122.3123.7121.5123.3121.0

aep:SouthwesternElectricPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value10065996898519760967696809592951894179317922091439053899689598915900989238814867185328410826981288014792476867704762575517443728971937070696568016556
Percentage of PropertyPlantAndEquipmentGross12.512.612.712.913.013.213.513.613.713.814.114.314.414.514.813.313.613.613.613.413.113.113.113.113.113.113.013.213.113.113.012.812.812.712.612.412.2
Percentage of Assets13.013.113.313.513.714.114.214.214.414.414.414.614.714.214.614.114.414.514.414.214.214.114.314.114.114.014.014.014.013.913.813.613.613.513.613.413.0
Percentage of Assets aep:SouthwesternElectricPowerCo126.7127.3126.8126.1126.0126.9120.1127.0126.8126.9122.0121.2120.2118.0117.9121.5123.4124.8124.1120.7118.7123.4123.0122.0120.5120.8123.0121.3121.0119.1120.4120.7122.6126.2127.0125.3125.0

us-gaap:ConsolidationItems

srt:ConsolidationEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value-354-354-354-354-354-354-354-366
Percentage of PropertyPlantAndEquipmentGross-0.4-0.4-0.5-0.5-0.5-0.5-0.5-0.5
Percentage of Assets-0.5-0.5-0.5-0.5-0.5-0.5-0.5-0.6
Percentage of Assets srt:ConsolidationEliminations9.09.39.510.912.313.110.412.1

us-gaap:StatementBusinessSegments

aep:GenerationAndMarketing



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value1753165016611176915893864829786644632518483364234756175107461747474567414839483638345830282778529
Percentage of PropertyPlantAndEquipmentGross2.22.12.11.61.21.21.21.21.11.01.00.80.80.60.411.311.311.411.511.511.413.113.213.413.613.714.8
Percentage of Assets2.32.22.21.61.31.31.31.21.21.01.00.80.80.60.411.912.012.112.212.212.314.114.414.514.614.715.7
Percentage of Assets aep:GenerationAndMarketing54.552.850.142.146.745.136.536.337.132.133.227.222.010.87.4139.1139.1137.8135.1131.5129.9132.6133.2132.4130.7128.8128.0

aep:TransmissionAndDistributionCompanies



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value201821977319283188741852618126176191720816790163711569515292149901476214438142171402913840137071350613251130241279212554123391214311461
Percentage of PropertyPlantAndEquipmentGross25.125.024.925.025.024.824.724.624.424.324.023.823.823.823.821.221.121.121.120.920.320.320.320.220.220.119.9
Percentage of Assets26.026.126.126.026.226.326.125.725.625.324.524.424.323.323.522.522.522.422.422.222.121.822.121.821.621.521.1
Percentage of Assets aep:TransmissionAndDistributionCompanies106.8105.4107.3106.2106.4106.1107.4105.0103.2101.999.6101.3101.299.7102.0100.497.894.594.994.192.089.992.590.688.885.784.8

aep:TransmissionOperations



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value106621033497009330865981307784711063946012566553544896452942303977359432752980271423782079184216361296107992174860450841032351
Percentage of PropertyPlantAndEquipmentGross13.313.112.512.311.811.411.110.59.89.49.08.68.16.86.46.15.55.14.64.23.83.33.02.72.21.81.61.31.10.90.70.60.1
Percentage of Assets13.713.613.112.912.612.011.611.010.09.69.28.48.07.26.86.45.95.45.04.64.13.63.22.92.42.01.71.41.11.00.80.60.1
Percentage of Assets aep:TransmissionOperations92.892.791.592.590.789.189.887.383.885.684.383.984.783.482.179.482.481.179.875.979.376.974.972.971.667.965.461.559.958.756.454.422.2

aep:VerticallyIntegratedUtilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value477644732346739462014568445365445534416243749432944272242313417804155241015407104059940130399813956140890394023885738390379233754536066
Percentage of PropertyPlantAndEquipmentGross59.459.860.361.161.662.162.663.163.664.265.366.066.467.067.760.761.161.361.761.262.661.361.661.962.162.362.8
Percentage of Assets61.562.463.263.764.665.965.966.066.766.966.867.467.765.566.864.365.065.165.464.968.166.167.166.666.566.666.3
Percentage of Assets aep:VerticallyIntegratedUtilities116.4114.8114.7114.3114.0116.7114.8114.9115.4115.2112.0111.6111.2111.0111.1111.1112.2112.1113.4112.0116.6116.7117.5116.2114.9114.5112.7

us-gaap:AllOtherSegments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value408418421413406395384382377374359365357356368361357350349357350343331329321315888811111111111111
Percentage of PropertyPlantAndEquipmentGross0.50.50.50.50.50.50.50.50.50.60.50.60.60.60.60.50.50.50.50.60.50.50.50.50.50.50.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets0.50.60.60.60.60.60.60.60.60.60.60.60.60.60.60.60.60.60.60.60.60.60.60.60.60.60.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AllOtherSegments5.87.78.48.89.49.88.99.48.39.51.61.71.71.81.71.61.61.61.61.71.61.61.61.61.61.60.00.00.00.00.10.10.10.10.10.10.1

us-gaap:StatementBusinessSegments, dei:LegalEntity

aep:StateTranscos, aep:AEPTransmissionCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value1022198939267890785678268
Percentage of PropertyPlantAndEquipmentGross12.712.512.011.811.611.3
Percentage of Assets13.213.012.512.312.112.0
Percentage of Assets aep:StateTranscos aep:AEPTransmissionCo100.7100.399.0100.199.898.4

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value193681900718760184391818217986178411757117431171671712116907166741639716337196461959719348195881958920496201882005919792195641928819174189321894518691193261895618791186991868018605183301806617340
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets24.925.025.425.425.726.126.426.326.626.526.826.927.025.826.631.031.431.432.132.134.133.934.634.334.334.234.934.434.734.435.935.535.535.836.536.736.335.835.9

dei:LegalEntity

aep:AEPTexasInc.



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value18001758174217121686165116431627161715941542
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment9.39.29.39.39.39.29.29.39.39.39.4
Percentage of Assets2.32.32.42.42.42.42.42.42.52.52.4
Percentage of Assets aep:AEPTexasInc.17.016.617.017.017.117.217.717.718.218.220.0

aep:AEPTransmissionCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value44540236833630627123421019217015113399
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment2.32.12.01.81.71.51.31.21.11.00.90.80.6
Percentage of Assets0.60.50.50.50.40.40.30.30.30.30.20.20.2
Percentage of Assets aep:AEPTransmissionCo4.44.13.93.83.63.22.92.82.72.42.32.21.9

aep:AppalachianPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value4497443243004230417441244086402839563896383637623705363635983527347334073426339638973823379737393679361733073263324631963162308730482994297529272843
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment23.223.322.922.923.022.922.922.922.722.722.422.322.222.222.018.017.717.617.517.319.018.918.918.918.818.817.217.217.117.116.416.316.216.015.915.715.7
Percentage of Assets5.85.85.85.85.96.06.06.06.06.06.06.06.05.75.95.65.65.55.65.66.56.46.66.56.56.46.05.96.05.95.95.85.85.75.85.85.6
Percentage of Assets aep:AppalachianPowerCo35.234.734.233.933.333.633.933.032.832.731.631.130.930.430.629.929.729.330.029.834.434.033.933.432.232.032.031.431.230.430.630.029.729.129.229.228.4

aep:IndianaMichiganPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value3356329432803227320831513113305730733024302230142984300530633065304830183084304934403410340333713337329933013269324432323224319632013179320331803124
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment17.317.317.517.517.617.517.517.417.617.617.717.817.918.318.815.615.615.615.715.616.816.917.017.017.117.117.217.317.117.316.716.917.017.017.117.117.3
Percentage of Assets4.34.34.44.44.54.64.64.64.74.74.74.84.84.75.04.84.94.95.05.05.75.75.95.95.95.86.05.95.95.96.06.06.16.16.36.36.2
Percentage of Assets aep:IndianaMichiganPowerCo30.829.329.829.529.830.830.830.431.230.930.931.431.632.233.833.934.334.635.735.139.839.440.940.540.440.040.340.240.341.342.042.142.743.044.544.643.7

aep:OhioPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value2292226322562238222422182230221822052184218221642140211621072089207020482086207020532038201119991986197352205154531152425894576456925742367137643606
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment11.811.912.012.112.212.312.512.612.712.712.712.812.812.912.910.610.610.610.710.610.010.110.010.110.210.227.227.228.028.030.530.430.330.719.720.220.0
Percentage of Assets2.93.03.13.13.13.23.33.33.43.43.43.43.53.33.43.33.33.33.43.43.43.43.53.53.53.59.59.49.79.610.910.810.811.07.27.47.1
Percentage of Assets aep:OhioPowerCo28.028.129.629.329.629.831.330.830.030.130.930.530.629.831.631.329.828.730.029.628.528.030.029.728.827.641.640.741.640.445.444.644.044.143.644.241.2

aep:PublicServiceCoOfOklahoma



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value1615158015581527149614721461143914151393138213621338127212971289136513521383136313421319133313181334132313211309129212781290126612651266128112901255
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment8.38.38.38.38.28.28.28.28.18.18.18.18.07.87.96.67.07.07.17.06.56.56.66.76.86.96.96.96.86.86.76.76.76.86.96.96.9
Percentage of Assets2.12.12.12.12.12.12.22.22.22.22.22.22.22.02.12.02.22.22.32.22.22.22.32.32.32.32.42.42.42.42.42.42.42.42.52.52.5
Percentage of Assets aep:PublicServiceCoOfOklahoma33.833.332.732.732.632.532.431.731.330.930.930.330.129.130.230.132.632.433.633.934.034.636.035.636.737.538.538.538.338.537.837.037.938.638.639.538.2

aep:SouthwesternElectricPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value2918287328482805276028082798275927242685267026342608256725722549262026022611257925412503248524562424239123782353231722842282224922302211220621832130
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment15.115.115.215.215.215.615.715.715.615.615.615.615.615.715.713.013.413.413.313.212.412.412.412.412.412.412.412.412.212.211.811.911.911.811.811.711.8
Percentage of Assets3.83.83.93.93.94.14.14.14.24.14.24.24.24.04.24.04.24.24.34.24.24.24.34.34.34.24.34.34.24.24.24.24.24.24.34.34.2
Percentage of Assets aep:SouthwesternElectricPowerCo36.736.736.736.235.936.835.036.836.736.635.334.934.633.733.934.735.936.436.835.935.336.737.036.936.536.438.037.136.836.036.937.238.039.540.240.240.6

us-gaap:ConsolidationItems

srt:ConsolidationEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value-186-186-186-186-186-186-186-186
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment-1.0-1.0-1.0-1.0-1.0-1.0-1.0-1.1
Percentage of Assets-0.2-0.2-0.3-0.3-0.3-0.3-0.3-0.3
Percentage of Assets srt:ConsolidationEliminations4.84.95.05.76.56.95.56.2

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

aep:GeneratingUnitsProbableofAbandonment, aep:DoletHillsGeneratingStationUnitNo1, aep:SouthwesternElectricPowerCo



Period End2020-03-312019-12-31
Value205194
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment1.11.0
Percentage of Assets0.30.3
Percentage of Assets aep:GeneratingUnitsProbableofAbandonment aep:DoletHillsGeneratingStationUnitNo1 aep:SouthwesternElectricPowerCo0.00.0

aep:GeneratingUnitsProbableofAbandonment, aep:OklaunionGeneratingStationUnitNo1, aep:PublicServiceCoOfOklahoma



Period End2020-03-312019-12-312019-09-302019-06-30
Value92868074
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment0.50.50.40.4
Percentage of Assets0.10.10.10.1
Percentage of Assets aep:GeneratingUnitsProbableofAbandonment aep:OklaunionGeneratingStationUnitNo1 aep:PublicServiceCoOfOklahoma0.00.00.00.0

us-gaap:StatementBusinessSegments

aep:GenerationAndMarketing



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value1169999795847402870751611451404244345934093367339033443309360335633514346034093465
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment0.60.50.50.40.30.30.20.20.40.40.90.90.80.30.317.617.417.417.317.116.117.817.817.817.717.718.5
Percentage of Assets0.20.10.10.10.10.10.10.00.10.10.30.20.20.10.15.55.55.55.55.55.56.06.26.16.16.06.4
Percentage of Assets aep:GenerationAndMarketing3.63.23.02.83.02.41.71.23.33.78.57.66.41.21.463.663.162.261.359.058.056.956.755.854.553.152.0

aep:TransmissionAndDistributionCompanies



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value396439113907387838563833385638303809376837663737369736553647361135733529360335653520348134473407338233423232
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment20.520.620.821.021.221.321.621.821.922.022.022.122.222.322.318.418.218.218.418.217.217.217.217.217.317.317.3
Percentage of Assets5.15.25.35.35.55.65.75.75.85.85.96.06.05.85.95.75.75.75.95.95.95.86.05.95.95.95.9
Percentage of Assets aep:TransmissionAndDistributionCompanies21.020.921.721.822.122.423.523.423.423.523.924.825.024.725.825.524.924.124.924.824.424.024.924.624.323.623.9

aep:TransmissionOperations



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value464418383350282244219176156137120101887563524334282520161310765422100
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment2.42.22.01.91.61.41.21.00.90.80.70.60.50.40.30.30.20.20.10.10.10.10.10.10.00.00.00.00.00.00.00.00.0
Percentage of Assets0.60.60.50.50.40.40.30.30.20.20.20.20.10.10.10.10.10.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets aep:TransmissionOperations4.03.83.63.53.02.72.52.22.12.01.81.61.51.41.21.01.00.80.70.70.70.60.50.40.40.40.40.30.20.20.10.00.0

aep:VerticallyIntegratedUtilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value148211458014359141241394413822137031349513355131531304212880127121259612549124331248512335124831234313335127731272812562124241225011733
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment76.576.776.576.676.776.976.876.876.676.676.276.276.276.876.863.363.763.863.763.065.163.363.563.563.563.562.8
Percentage of Assets19.119.219.419.519.720.120.320.220.420.320.420.520.619.820.419.620.020.020.420.322.221.422.021.821.821.721.6
Percentage of Assets aep:VerticallyIntegratedUtilities36.135.435.234.934.835.635.335.135.235.034.234.033.833.734.033.934.534.535.435.038.037.838.538.037.737.436.7

us-gaap:AllOtherSegments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value1871841961931901861831851821801801941881861921861801761781811831881831811761738777101010101099
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment1.01.01.01.01.01.01.01.11.01.11.11.11.11.11.21.00.90.90.90.90.90.90.90.90.90.90.00.00.00.00.10.10.10.10.10.00.0
Percentage of Assets0.20.20.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AllOtherSegments2.73.43.94.14.44.64.34.54.04.60.80.90.90.90.90.80.80.80.80.80.90.90.90.90.90.90.00.00.00.00.10.10.10.10.10.10.1

us-gaap:StatementBusinessSegments, dei:LegalEntity

aep:StateTranscos, aep:AEPTransmissionCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value445402368336306271
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment2.32.12.01.81.71.5
Percentage of Assets0.60.50.50.50.40.4
Percentage of Assets aep:StateTranscos aep:AEPTransmissionCo4.44.13.93.83.63.2

us-gaap:VariableInterestEntitiesByClassificationOfEntity, dei:LegalEntity

aep:SabineMiningCo, aep:SouthwesternElectricPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value11210710510199174107106103999691
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment0.60.60.60.60.51.00.60.60.60.50.50.5
Percentage of Assets0.10.10.10.10.10.30.20.20.20.20.20.2
Percentage of Assets aep:SabineMiningCo aep:SouthwesternElectricPowerCo0.00.00.00.00.00.00.00.00.00.00.00.0

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value610486013858692572025596855099533555244151365502614831647227462364563944262474364683246133452384501344810441174306442273415304099739870394253913038763381333782837432369713641736064357663567434344
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets78.579.279.478.879.180.178.978.478.377.675.575.374.971.972.074.974.974.874.073.974.674.074.373.472.872.772.571.771.771.370.870.870.870.871.171.170.770.771.0

dei:LegalEntity

aep:AEPTexasInc.



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value90558845858783808220799176417398711268255780
Percentage of PropertyPlantAndEquipmentNet14.814.714.614.714.714.514.314.113.813.612.7
Percentage of Assets11.711.711.611.611.611.611.311.110.810.59.1
Percentage of Assets aep:AEPTexasInc.85.783.583.783.283.483.282.280.579.977.875.0

aep:AEPTransmissionCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value9775949088988570826079967527721569156609591655574954
Percentage of PropertyPlantAndEquipmentNet16.015.815.215.014.814.514.113.813.513.212.211.810.9
Percentage of Assets12.612.512.011.811.711.611.110.810.510.29.28.97.8
Percentage of Assets aep:AEPTransmissionCo95.896.095.196.595.995.394.195.895.593.590.393.592.6

aep:AppalachianPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value111561108110992108571073010668105051042810337102451006899589871982596469578948994249294922892369181907890378992896981598139812681098025797579317913779974377396
Percentage of PropertyPlantAndEquipmentNet18.318.418.719.019.219.419.719.920.120.420.821.121.321.521.820.220.320.420.520.520.620.821.121.421.721.920.520.620.820.921.021.121.221.421.420.620.7
Percentage of Assets14.414.614.915.015.215.515.515.615.815.815.715.916.015.515.715.115.215.315.215.115.415.415.715.715.815.914.814.814.914.914.914.915.015.215.214.714.7
Percentage of Assets aep:AppalachianPowerCo87.286.887.587.085.786.887.185.485.685.983.182.382.282.082.081.281.180.981.581.081.681.781.180.778.879.379.178.478.077.277.877.677.376.876.674.174.0

aep:IndianaMichiganPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value6917689968326784668066116236619461266050590358305679562754685411529252035239517654525416526451945115505649004862477147284425442443954404437843464270
Percentage of PropertyPlantAndEquipmentNet11.311.511.611.911.912.011.711.811.912.012.212.312.312.312.411.411.311.311.611.512.212.312.212.312.312.312.312.312.212.211.611.711.711.912.012.112.0
Percentage of Assets8.99.19.29.49.49.69.29.39.39.39.29.39.28.98.98.58.58.48.68.59.19.19.19.09.09.08.98.88.78.78.28.38.38.48.68.68.5
Percentage of Assets aep:IndianaMichiganPowerCo63.461.462.162.062.064.761.761.662.261.960.460.860.160.260.359.859.659.760.759.663.162.563.262.461.961.359.959.759.260.457.758.358.659.660.960.959.7

aep:OhioPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value70346907669765426395627461025960585557665580547653805325521251615104505449844924484647634675459345204465100289988101001009210294103061029810155647765486656
Percentage of PropertyPlantAndEquipmentNet11.511.511.411.411.411.411.411.411.411.511.511.611.611.711.810.910.911.011.010.910.810.810.910.910.910.925.225.325.826.027.027.227.527.517.818.218.7
Percentage of Assets9.19.19.19.09.09.19.08.98.98.98.78.78.78.48.58.28.28.28.28.18.18.08.18.07.97.918.218.218.518.619.119.319.519.412.712.913.2
Percentage of Assets aep:OhioPowerCo86.085.987.985.785.184.485.782.979.679.479.177.276.975.178.277.473.570.871.870.467.265.569.868.265.562.479.978.979.177.779.379.879.678.076.976.976.1

aep:PublicServiceCoOfOklahoma



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value4140410340384000397639663933391539013886385738403810382337423706375336933615356635023440333332733214316530593014296729392881285528172790275527362720
Percentage of PropertyPlantAndEquipmentNet6.86.86.97.07.17.27.47.57.67.78.08.18.28.48.57.88.08.08.07.97.87.87.77.77.77.77.77.67.67.67.67.57.57.57.67.67.6
Percentage of Assets5.35.45.55.55.65.85.85.95.96.06.06.16.26.06.15.96.06.05.95.95.85.85.85.75.65.65.65.55.45.45.45.35.35.35.45.45.4
Percentage of Assets aep:PublicServiceCoOfOklahoma86.786.484.785.786.687.587.286.386.286.286.185.585.687.387.286.689.588.687.988.888.890.289.988.388.589.889.188.587.888.484.583.484.485.182.983.882.8

aep:SouthwesternElectricPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value7146709570036955691568716794675966926632654965096445642963876366638863216203609159915907578456725589553253085350530852665160504049624859475846174425
Percentage of PropertyPlantAndEquipmentNet11.711.811.912.212.412.512.712.913.013.213.613.813.914.114.413.413.613.713.713.513.413.413.413.413.513.513.313.613.613.613.513.313.313.113.112.812.4
Percentage of Assets9.29.39.59.69.810.010.010.110.210.210.210.410.410.110.410.110.210.210.210.010.09.910.09.89.89.89.79.79.79.79.69.49.49.39.39.18.8
Percentage of Assets aep:SouthwesternElectricPowerCo90.090.690.289.890.090.185.190.290.190.386.786.385.684.384.186.787.588.487.484.883.386.786.085.284.184.384.984.384.383.183.583.584.686.786.785.084.4

us-gaap:ConsolidationItems

srt:ConsolidationEliminations



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value-168-168-168-168-168-168-168-179
Percentage of PropertyPlantAndEquipmentNet-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.4
Percentage of Assets-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.3
Percentage of Assets srt:ConsolidationEliminations4.34.44.55.25.86.24.95.9

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

aep:GeneratingUnitsProbableofAbandonment, aep:DoletHillsGeneratingStationUnitNo1, aep:SouthwesternElectricPowerCo



Period End2020-03-312019-12-31
Value136144
Percentage of PropertyPlantAndEquipmentNet0.20.2
Percentage of Assets0.20.2
Percentage of Assets aep:GeneratingUnitsProbableofAbandonment aep:DoletHillsGeneratingStationUnitNo1 aep:SouthwesternElectricPowerCo0.00.0

aep:GeneratingUnitsProbableofAbandonment, aep:OklaunionGeneratingStationUnitNo1, aep:PublicServiceCoOfOklahoma



Period End2020-03-312019-12-312019-09-302019-06-30
Value14202632
Percentage of PropertyPlantAndEquipmentNet0.00.00.00.1
Percentage of Assets0.00.00.00.0
Percentage of Assets aep:GeneratingUnitsProbableofAbandonment aep:OklaunionGeneratingStationUnitNo1 aep:PublicServiceCoOfOklahoma0.00.00.00.0

us-gaap:PublicUtility, aep:BaseRate, dei:LegalEntity

aep:VirginiaJurisdictionalAMRMeters, aep:VirginiaLegislationAffectingBiennialReviews, aep:AppalachianPowerCo



Period End2020-03-312019-12-31
Value5251
Percentage of PropertyPlantAndEquipmentNet0.10.1
Percentage of Assets0.10.1
Percentage of Assets aep:VirginiaJurisdictionalAMRMeters aep:VirginiaLegislationAffectingBiennialReviews aep:AppalachianPowerCo0.00.0

us-gaap:PublicUtility, aep:RegulatedStatus

aep:VirginiaJurisdictionalAMRMeters, aep:RegulatoryAssetsPendingFinalRegulatoryApproval



Period End2020-03-312019-12-31
Value5251
Percentage of PropertyPlantAndEquipmentNet0.10.1
Percentage of Assets0.10.1
Percentage of Assets aep:VirginiaJurisdictionalAMRMeters aep:RegulatoryAssetsPendingFinalRegulatoryApproval0.00.0

us-gaap:PublicUtility, aep:RegulatedStatus, dei:LegalEntity

aep:VirginiaJurisdictionalAMRMeters, aep:RegulatoryAssetsPendingFinalRegulatoryApproval, aep:AppalachianPowerCo



Period End2020-03-312019-12-31
Value5251
Percentage of PropertyPlantAndEquipmentNet0.10.1
Percentage of Assets0.10.1
Percentage of Assets aep:VirginiaJurisdictionalAMRMeters aep:RegulatoryAssetsPendingFinalRegulatoryApproval aep:AppalachianPowerCo0.00.0

us-gaap:StatementBusinessSegments

aep:GenerationAndMarketing



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value1636155115611097856846824801716569471373343322190410241014094408441124105479148004831484248685064
Percentage of PropertyPlantAndEquipmentNet2.72.62.71.91.51.51.51.51.41.11.00.80.70.70.48.68.88.99.09.19.210.911.111.411.711.913.1
Percentage of Assets2.12.02.11.51.21.21.21.21.10.90.70.60.60.50.36.56.66.66.76.76.88.08.38.48.58.69.3
Percentage of Assets aep:GenerationAndMarketing50.949.747.139.343.742.734.835.133.828.324.719.615.69.56.075.475.975.673.872.571.975.776.476.776.275.876.0

aep:TransmissionAndDistributionCompanies



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value1621815862153761499614670142931376213377129801260211929115541129211107107911060610455103111010499419731954393459147895788018229
Percentage of PropertyPlantAndEquipmentNet26.626.426.226.226.225.925.825.525.325.124.724.524.424.324.422.422.322.422.322.121.721.621.721.621.621.521.2
Percentage of Assets20.920.920.820.720.720.820.420.019.819.518.618.418.317.517.616.816.716.716.516.316.216.016.115.915.715.615.1
Percentage of Assets aep:TransmissionAndDistributionCompanies85.884.685.684.484.283.783.981.679.878.575.776.676.275.076.274.972.970.470.069.367.665.867.666.064.462.160.9

aep:TransmissionOperations



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312010-12-31
Value10198991593168980837678867565693362375875554452524808445441663925355132412952268923582063182916261289107391674460250640932351
Percentage of PropertyPlantAndEquipmentNet16.716.515.915.715.214.814.413.812.912.412.011.510.99.48.98.57.87.26.66.15.54.94.44.03.22.72.31.91.61.31.10.90.1
Percentage of Assets13.113.112.612.412.211.711.310.79.89.49.08.37.87.06.76.45.85.34.94.54.13.63.22.92.32.01.71.41.10.90.80.60.1
Percentage of Assets aep:TransmissionOperations88.889.087.889.087.886.487.385.281.783.682.582.383.282.080.978.381.480.379.075.278.676.474.372.471.367.665.061.259.758.556.354.422.2

aep:VerticallyIntegratedUtilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value329423274332380320773173931542308503066730394301412968029433290672895528465282772811427795274982721827555266292612925828254992529524333
Percentage of PropertyPlantAndEquipmentNet54.054.455.256.156.757.257.858.559.260.061.462.362.963.464.359.660.060.360.860.561.560.460.761.161.461.762.8
Percentage of Assets42.443.143.844.244.945.845.645.946.346.646.446.947.145.646.344.745.045.145.044.745.944.745.144.844.744.844.8
Percentage of Assets aep:VerticallyIntegratedUtilities80.379.479.579.379.281.179.579.880.280.277.877.677.477.477.177.277.777.778.077.178.678.979.078.277.377.176.0

us-gaap:AllOtherSegments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value22123322521921520820119719419317817116817017617417617417117616715514814814514201111111122
Percentage of PropertyPlantAndEquipmentNet0.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.30.40.30.30.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets0.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AllOtherSegments3.14.34.54.75.05.24.74.94.34.90.80.80.80.80.80.80.80.80.80.80.80.70.70.70.70.70.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementBusinessSegments, dei:LegalEntity

aep:StateTranscos, aep:AEPTransmissionCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value977594908898857082607996
Percentage of PropertyPlantAndEquipmentNet16.015.815.215.014.814.5
Percentage of Assets12.612.512.011.811.711.6
Percentage of Assets aep:StateTranscos aep:AEPTransmissionCo96.396.295.096.396.295.1

Investments In Affiliates Subsidiaries Associates And Joint Ventures

Goodwill

us-gaap:Goodwill



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value525252525252525252525252525252525252539191919191919191919191909090767676767676
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.20.20.20.20.20.20.20.20.20.20.20.20.20.10.10.10.20.20.2

Deferred Tax Assets Liabilities Net

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value34143407279429912655257723942528261125531856202521712085189420042174210620692188227822211944205621622038141415811651162713971405149913461135126413471079946
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.44.53.84.13.83.73.53.84.03.92.93.23.53.33.13.23.53.43.43.63.83.73.43.63.83.62.62.93.03.02.62.62.82.62.22.52.72.12.0

dei:LegalEntity

aep:AEPTexasInc.



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value219147161181212569711513411473
Percentage of OtherAssetsNoncurrent6.44.35.86.18.02.24.14.65.14.53.5
Percentage of Assets0.30.20.20.30.30.10.10.20.20.20.1
Percentage of Assets aep:AEPTexasInc.2.11.41.61.82.20.61.11.31.51.31.0

aep:AEPTransmissionCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value4456714711111
Percentage of OtherAssetsNoncurrent0.10.10.20.20.30.10.20.30.00.00.10.10.1
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets aep:AEPTransmissionCo0.00.00.10.10.10.00.10.10.00.00.00.00.0

aep:AppalachianPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value22521515917619418818021119519011313114313311012613911314115416215913314615714896109120115100110124122105119125
Percentage of OtherAssetsNoncurrent6.66.35.75.97.37.37.58.37.57.46.16.56.66.45.86.36.45.46.87.17.27.26.87.17.37.36.86.97.37.17.27.98.39.19.39.511.6
Percentage of Assets0.30.30.20.20.30.30.30.30.30.30.20.20.20.20.20.20.20.20.20.30.30.30.20.30.30.30.20.20.20.20.20.20.20.20.20.20.2
Percentage of Assets aep:AppalachianPowerCo1.81.71.31.41.61.51.51.71.61.60.91.11.21.10.91.11.21.01.21.41.41.41.21.31.41.30.91.11.21.11.01.11.21.21.01.21.3

aep:IndianaMichiganPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value184181129156171193175176168179951041171211361481611401231271371371111301401438711711711195647569577377
Percentage of OtherAssetsNoncurrent5.45.34.65.26.47.57.37.06.47.05.25.15.45.87.27.47.46.76.05.86.06.25.76.36.57.06.27.47.16.86.84.65.05.15.15.87.2
Percentage of Assets0.20.20.20.20.20.30.30.30.30.30.10.20.20.20.20.20.30.20.20.20.20.20.20.20.20.30.20.20.20.20.20.10.10.10.10.10.2
Percentage of Assets aep:IndianaMichiganPowerCo1.71.61.21.41.61.91.71.81.71.81.01.11.21.31.51.61.81.61.41.51.61.61.31.61.71.71.11.41.51.41.20.91.00.90.81.01.1

aep:OhioPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value48554632040246444125432434237413119124029511617222525911817021526411316021126013319325032014019325030972142189
Percentage of OtherAssetsNoncurrent14.216.011.513.517.517.110.612.813.114.77.19.411.114.26.18.610.412.35.77.89.511.95.87.89.812.89.412.315.219.710.013.816.723.06.411.317.5
Percentage of Assets0.60.70.40.60.70.60.40.50.50.60.20.30.40.50.20.30.40.40.20.30.40.40.20.30.40.50.20.40.50.60.30.40.50.60.10.30.4
Percentage of Assets aep:OhioPowerCo5.96.84.25.36.25.93.64.54.65.21.92.73.44.21.72.63.33.61.72.43.03.61.72.43.13.61.11.52.02.51.11.51.92.40.91.72.2

aep:PublicServiceCoOfOklahoma



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value3441728377162334819283910182532615233271522387172737818324213243020
Percentage of OtherAssetsNoncurrent1.00.10.60.91.40.30.70.91.30.31.01.41.80.51.01.31.50.30.81.11.40.30.81.11.80.41.21.82.30.51.32.32.81.02.12.41.9
Percentage of Assets0.00.00.00.00.10.00.00.00.10.00.00.00.10.00.00.00.10.00.00.00.10.00.00.00.10.00.00.10.10.00.00.10.10.00.00.10.0
Percentage of Assets aep:PublicServiceCoOfOklahoma0.70.10.40.60.80.20.40.50.80.20.40.60.90.20.40.60.80.20.40.60.80.20.40.61.10.20.50.81.10.30.60.91.30.40.70.90.6

aep:SouthwesternElectricPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value214160167179193111133149165109116128147991161161207585120130861101231339281100112768998108748310280
Percentage of OtherAssetsNoncurrent6.34.76.06.07.34.35.65.96.34.36.36.36.84.86.15.85.53.64.15.55.73.95.76.06.24.65.86.46.84.76.47.07.25.67.48.17.4
Percentage of Assets0.30.20.20.20.30.20.20.20.30.20.20.20.20.20.20.20.20.10.10.20.20.10.20.20.20.20.10.20.20.10.20.20.20.10.20.20.2
Percentage of Assets aep:SouthwesternElectricPowerCo2.72.02.22.32.51.51.72.02.21.51.51.72.01.31.51.61.61.11.21.71.81.31.61.82.01.41.31.61.81.21.41.61.81.31.51.91.5

Liabilities Current

us-gaap:LiabilitiesCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value11654102998611835779908648842690589471827173228392791494987779786972217108705866507128796774577600651961125692651961756823679564076342661156845887598965185327
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets15.013.611.711.511.312.612.513.514.412.811.413.412.815.012.712.411.611.511.610.911.913.412.913.211.410.810.411.911.312.512.612.012.012.711.111.611.812.911.0

dei:LegalEntity

aep:AEPTexasInc.



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value965102710161072132812591086749945871797
Percentage of LiabilitiesCurrent8.310.011.812.816.614.612.98.310.010.58.4
Percentage of Assets1.21.41.41.51.91.81.61.11.41.31.3
Percentage of Assets aep:AEPTexasInc.9.19.79.910.713.513.111.78.210.69.910.3

aep:AEPTransmissionCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value10711093710712933842546715857836467640550
Percentage of LiabilitiesCurrent9.210.68.28.511.79.76.57.99.110.16.47.65.8
Percentage of Assets1.41.41.01.01.31.20.81.11.31.30.71.00.9
Percentage of Assets aep:AEPTransmissionCo10.511.17.68.010.810.06.89.511.811.87.110.810.3

aep:AppalachianPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value158712269808811024135412161326118111248498981191128011701304111811259919171284127513151349121510851059122912841413132513121332144511798781355
Percentage of LiabilitiesCurrent13.611.911.410.512.815.714.414.612.513.611.610.715.113.515.116.615.515.814.113.818.016.017.617.818.617.818.618.920.820.719.520.521.021.920.814.920.8
Percentage of Assets2.01.61.31.21.42.01.82.01.81.71.31.41.92.01.92.11.81.81.61.52.12.12.32.32.11.91.92.22.42.62.52.52.52.82.31.72.7
Percentage of Assets aep:AppalachianPowerCo12.49.67.87.18.211.010.110.99.89.47.07.49.910.79.911.19.69.78.78.111.311.411.712.110.69.610.311.812.313.512.812.813.014.011.68.813.6

aep:IndianaMichiganPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value82088376181073969862111481756121110991053937955635700665103795993610431101866853808855646669629796751688714731643598700
Percentage of LiabilitiesCurrent7.08.68.89.79.38.17.412.718.514.615.012.511.810.18.28.99.214.613.614.114.613.811.611.212.414.011.410.310.211.711.110.711.311.111.310.210.8
Percentage of Assets1.11.21.01.11.01.00.91.72.71.91.71.71.51.51.01.11.11.71.61.51.71.81.51.51.41.51.21.21.21.51.41.31.41.41.31.21.4
Percentage of Assets aep:IndianaMichiganPowerCo7.57.96.97.46.96.86.111.417.812.411.311.09.910.27.07.77.511.911.110.812.112.710.410.39.810.47.98.27.810.29.89.19.59.98.98.49.8

aep:OhioPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value1043129786794812141347113711271363159313441463107111817399541239142511661192104711398819521089142214371925180421041801159616671513623656895
Percentage of LiabilitiesCurrent9.012.610.111.415.215.613.512.414.419.318.417.413.512.49.512.117.220.116.517.914.714.311.812.516.723.325.229.529.230.826.524.926.322.911.011.213.7
Percentage of Assets1.31.71.21.31.72.01.71.72.12.52.12.31.71.91.21.52.02.31.92.01.71.91.51.71.92.52.63.53.33.93.33.03.22.91.21.31.8
Percentage of Assets aep:OhioPowerCo12.816.111.412.416.218.116.015.718.521.919.120.615.316.711.114.317.820.016.817.014.515.713.214.115.819.911.415.214.116.213.912.412.911.67.47.710.2

aep:PublicServiceCoOfOklahoma



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value730445552551756821386447470436411490475403441496638664486307272441400446442407339357300275309351293248302297353
Percentage of LiabilitiesCurrent6.34.36.46.69.59.54.64.95.05.35.65.86.04.25.76.38.89.46.94.63.85.55.45.96.86.76.05.54.94.04.55.54.63.85.35.05.4
Percentage of Assets0.90.60.70.81.11.20.60.70.70.70.60.80.80.60.70.81.01.10.80.50.50.70.70.80.80.70.60.70.60.50.60.70.60.50.60.60.7
Percentage of Assets aep:PublicServiceCoOfOklahoma15.39.411.611.816.518.18.69.910.49.79.210.910.79.210.311.615.215.911.87.76.911.610.812.112.211.59.910.58.98.39.110.38.87.69.19.110.8

aep:SouthwesternElectricPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value746674626708507512913106310595988569201043783791916954589495637699820775715605468402428389440418463455654525562493
Percentage of LiabilitiesCurrent6.46.67.38.56.35.910.811.711.27.211.711.013.28.310.211.613.28.37.09.69.810.310.49.49.37.77.16.66.36.56.27.27.29.99.29.67.6
Percentage of Assets1.00.90.81.00.70.71.41.61.60.91.31.51.71.21.31.41.51.00.81.01.21.41.31.21.10.80.70.80.70.80.80.90.91.31.01.11.0
Percentage of Assets aep:SouthwesternElectricPowerCo9.48.68.19.26.66.711.414.214.38.211.312.213.810.310.412.513.18.27.08.99.712.011.510.79.17.16.46.76.27.06.87.77.811.79.610.49.4

Long Term Debt Current

us-gaap:LongTermDebtCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value210915981327125715281698190422812616175323592755251428782384200620331831182618172451250323812524161215491366181916742171227219831980143312671071142113091741
Percentage of LongTermDebtCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.72.11.81.72.22.52.83.44.02.73.74.44.14.53.93.23.33.03.03.04.14.24.14.42.82.72.53.33.14.04.23.73.72.72.52.12.82.63.6

dei:LegalEntity

aep:AEPTexasInc.



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value289392391309508501500293273266263
Percentage of LongTermDebtCurrent13.724.529.524.633.329.526.312.910.415.29.1
Percentage of Assets0.40.50.50.40.70.70.70.40.40.40.4
Percentage of Assets aep:AEPTexasInc.2.73.73.83.15.25.25.43.23.13.03.4

aep:AppalachianPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value583215215150345430430530249249149149399503503568318318318252552552652653553342229574574574574545545594545229479
Percentage of LongTermDebtCurrent27.613.516.211.922.625.422.623.39.514.26.35.415.917.521.128.315.717.417.413.922.522.127.425.934.322.116.831.634.326.525.327.527.541.543.021.436.6
Percentage of Assets0.80.30.30.20.50.60.60.80.40.40.20.20.60.80.80.90.50.50.50.40.90.91.11.11.00.60.41.01.11.11.11.01.01.11.10.51.0
Percentage of Assets aep:AppalachianPowerCo4.61.71.71.22.83.53.64.32.12.11.21.23.34.24.34.82.72.72.82.24.94.95.85.84.83.02.25.55.55.55.65.35.35.85.42.34.8

aep:IndianaMichiganPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value133139147155140155172657941474462479199209176174151162301312374382238260287294224228197203304303277279155151154
Percentage of LongTermDebtCurrent6.38.711.112.39.29.19.128.836.027.119.617.47.97.37.48.77.58.916.517.215.315.310.010.317.819.016.512.611.89.413.415.314.019.512.314.111.8
Percentage of Assets0.20.20.20.20.20.20.31.01.40.70.70.80.30.30.30.30.20.30.50.50.60.60.40.50.50.50.40.40.40.40.60.60.50.50.30.30.3
Percentage of Assets aep:IndianaMichiganPowerCo1.21.21.31.41.31.51.76.59.64.94.75.02.12.21.91.91.71.93.53.64.34.42.93.13.53.62.72.82.42.64.04.03.73.82.22.12.2

aep:OhioPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value0002424474747397397397396464646453953953953961321311311822354385536645818568566065942445050165
Percentage of LongTermDebtCurrent0.00.00.02.01.62.82.52.115.222.616.814.41.91.61.92.319.521.621.721.85.45.35.57.214.628.340.536.534.739.437.730.630.017.13.94.712.6
Percentage of Assets0.00.00.00.00.00.10.10.10.60.60.60.60.10.10.10.10.60.60.60.60.20.20.20.30.40.81.01.21.11.61.61.11.10.50.10.10.3
Percentage of Assets aep:OhioPowerCo0.00.00.00.30.30.60.70.75.45.55.65.60.70.70.70.75.75.55.75.71.81.82.02.73.46.14.45.34.66.66.64.74.61.90.60.61.9

aep:PublicServiceCoOfOklahoma



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value263131381383753750000000012512527527515000000343434340000000025
Percentage of LongTermDebtCurrent12.50.810.411.024.622.10.00.00.00.00.00.00.00.05.36.313.515.08.20.00.00.00.00.02.12.22.51.90.00.00.00.00.00.00.00.01.9
Percentage of Assets0.30.00.20.20.50.50.00.00.00.00.00.00.00.00.20.20.40.40.20.00.00.00.00.00.10.10.10.10.00.00.00.00.00.00.00.00.0
Percentage of Assets aep:PublicServiceCoOfOklahoma5.50.32.93.08.28.30.00.00.00.00.00.00.00.02.92.96.66.63.70.00.00.00.00.00.91.01.01.00.00.00.00.00.00.00.00.00.8

aep:SouthwesternElectricPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value121121121121659457457457338538548535335425325333153253306306156563333333320206141
Percentage of LongTermDebtCurrent5.77.69.19.60.43.524.020.017.50.216.314.019.312.314.812.612.50.20.28.410.312.312.96.23.50.20.20.20.20.10.10.20.21.41.65.73.1
Percentage of Assets0.20.20.20.20.00.10.70.70.70.00.60.60.80.60.60.40.40.00.00.30.40.50.50.30.10.00.00.00.00.00.00.00.00.00.00.10.1
Percentage of Assets aep:SouthwesternElectricPowerCo1.51.51.61.60.10.85.76.16.20.15.15.16.44.64.73.53.50.00.02.13.54.54.62.40.90.00.10.10.10.10.10.10.10.40.41.10.8

us-gaap:ConsolidatedEntities

srt:Subsidiaries



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value289565544554375406420406
Percentage of LongTermDebtCurrent13.735.341.044.124.623.922.123.2
Percentage of Assets0.40.70.70.80.50.60.60.6
Percentage of Assets srt:Subsidiaries0.00.00.00.00.00.00.00.0

us-gaap:StatementBusinessSegments

aep:GenerationAndMarketing



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value00000000000005005055117171151240740740661687126
Percentage of LongTermDebtCurrent0.00.00.00.00.00.00.00.00.00.00.00.00.017.421.225.53.53.98.313.230.229.627.827.28.1
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.80.80.80.10.10.20.41.21.21.11.20.2
Percentage of Assets aep:GenerationAndMarketing0.00.00.00.00.00.00.00.00.00.00.00.00.014.815.99.41.31.32.74.213.011.710.510.92.0

aep:TransmissionAndDistributionCompanies



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value289392391334533549548341670663703756316309268261786824724678414405405448697
Percentage of LongTermDebtCurrent13.724.529.526.634.932.328.815.025.637.829.827.512.610.811.313.038.745.039.637.316.916.217.017.745.0
Percentage of Assets0.40.50.50.50.80.80.80.51.01.01.11.20.50.50.40.41.31.31.21.10.70.70.70.81.2
Percentage of Assets aep:TransmissionAndDistributionCompanies1.52.12.21.93.13.23.32.14.14.14.55.02.12.11.91.85.55.65.04.72.92.82.93.24.9

aep:TransmissionOperations



Period End2020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value002492488550505000130000000000000
Percentage of LongTermDebtCurrent0.00.018.819.75.02.62.22.90.00.05.20.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets0.00.00.30.30.10.10.10.10.00.00.20.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets aep:TransmissionOperations0.00.02.32.50.90.50.60.60.00.01.90.00.00.00.00.00.00.00.00.00.00.00.0

aep:VerticallyIntegratedUtilities



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value13167046876749121066130618901893103811071449151815191611123211749359498941291135213091382720
Percentage of LongTermDebtCurrent62.444.151.853.659.762.868.682.972.459.246.952.660.452.867.661.457.851.152.049.252.754.055.054.846.5
Percentage of Assets1.70.90.90.91.31.51.92.82.91.61.72.32.52.42.61.91.91.51.61.52.22.32.32.41.3
Percentage of Assets aep:VerticallyIntegratedUtilities3.21.71.71.72.32.73.44.95.02.82.93.84.04.14.43.43.22.62.72.53.74.04.04.22.2

us-gaap:AllOtherSegments



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value50450100-1-2001254854854854801102233344
Percentage of LongTermDebtCurrent23.931.4-0.00.0-0.1-0.1-0.0-0.00.10.123.319.921.819.10.00.00.00.00.10.10.10.10.10.20.3
Percentage of Assets0.60.7-0.00.0-0.0-0.0-0.0-0.00.00.00.90.90.90.90.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:AllOtherSegments7.29.2-0.00.0-0.0-0.0-0.0-0.00.00.12.52.62.62.70.00.00.00.00.00.00.00.00.00.00.0

us-gaap:VariableInterestEntitiesByClassificationOfEntity, dei:LegalEntity

aep:AEPTexasTransitionFundingandRestorationFunding, aep:AEPTexasInc.



Period End2020-03-312019-12-312019-09-302018-12-31
Value178281280251
Percentage of LongTermDebtCurrent8.517.621.114.8
Percentage of Assets0.20.40.40.4
Percentage of Assets aep:AEPTexasTransitionFundingandRestorationFunding aep:AEPTexasInc.0.00.00.00.0

aep:DccFuel, aep:IndianaMichiganPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value80866876617612599101727477
Percentage of LongTermDebtCurrent3.85.45.26.14.04.56.35.07.15.76.95.9
Percentage of Assets0.10.10.10.10.10.10.20.20.20.10.10.2
Percentage of Assets aep:DccFuel aep:IndianaMichiganPowerCo0.00.00.00.00.00.00.00.00.00.00.00.0

Accounts Payable Current

us-gaap:AccountsPayableCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value159320851766168914971874157916351449206515371268111616881340124212191418127412361283128712591228121312661044987100411699889069781095100396988410611158
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.12.72.42.32.12.72.32.42.23.22.42.01.82.72.22.02.02.32.12.02.12.22.22.12.12.21.91.81.82.21.81.71.82.12.01.91.72.12.4

dei:LegalEntity

aep:AEPTexasInc.



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value233256224238242276208220209379129
Percentage of AccountsPayableCurrent14.612.312.714.116.214.813.213.514.418.47.7
Percentage of Assets0.30.30.30.30.30.40.30.30.30.60.2
Percentage of Assets aep:AEPTexasInc.2.22.42.22.42.52.92.22.42.34.31.7

aep:AEPTransmissionCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value334493319270258347237230210473233178289
Percentage of AccountsPayableCurrent21.023.718.116.017.218.515.014.114.522.915.214.017.2
Percentage of Assets0.40.70.40.40.40.50.40.30.30.70.40.30.5
Percentage of Assets aep:AEPTransmissionCo3.35.03.43.03.04.13.03.12.96.73.63.05.4

aep:AppalachianPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value198307298290218263219227218264235212170253174161182196186170186166159171188169141150164195189139173186170173223
Percentage of AccountsPayableCurrent12.514.816.917.214.614.113.913.915.012.815.316.815.315.013.013.014.913.914.613.814.513.012.613.915.613.413.615.216.316.719.215.417.717.017.017.921.0
Percentage of Assets0.30.40.40.40.30.40.30.30.30.40.40.30.30.40.30.30.30.30.30.30.30.30.30.30.30.30.30.30.30.40.40.30.30.40.30.30.4
Percentage of Assets aep:AppalachianPowerCo1.62.42.42.31.72.11.81.91.82.21.91.81.42.11.51.41.61.71.61.51.61.51.41.51.71.51.41.41.61.91.81.41.71.81.71.72.2

aep:IndianaMichiganPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value131169148176160174142162164154168173133179140174176201132117143168146163121142120143126208957810811311082121
Percentage of AccountsPayableCurrent8.38.18.410.510.79.39.09.911.47.511.013.711.910.610.514.114.514.210.49.511.113.111.613.310.011.211.614.612.617.99.78.711.110.311.08.511.5
Percentage of Assets0.20.20.20.20.20.30.20.20.30.20.30.30.20.30.20.30.30.30.20.20.20.30.30.30.20.30.20.30.20.40.20.10.20.20.20.20.2
Percentage of Assets aep:IndianaMichiganPowerCo1.21.51.31.61.51.71.41.61.71.61.71.81.41.91.51.92.02.31.51.41.71.91.82.01.51.71.51.81.62.71.21.01.41.51.51.21.7

aep:OhioPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value220233203177177211169160159205157150129175152136131156141166156145128124128146249228275276233224229293164139170
Percentage of AccountsPayableCurrent13.811.211.510.511.911.310.79.811.010.010.311.811.610.411.411.010.811.011.113.412.211.310.210.110.611.623.923.127.523.623.624.823.426.816.414.416.0
Percentage of Assets0.30.30.30.20.30.30.30.20.20.30.20.20.20.30.20.20.20.30.20.30.30.20.20.20.20.30.50.40.50.50.40.40.40.60.30.30.3
Percentage of Assets aep:OhioPowerCo2.72.92.72.32.42.82.42.22.22.82.22.11.82.52.32.01.92.22.02.42.22.01.91.81.92.02.01.82.22.11.81.71.82.31.91.61.9

aep:PublicServiceCoOfOklahoma



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value1021341281149012611312588102931049211611610187108988984929811510615010696738783715376809369
Percentage of AccountsPayableCurrent6.46.47.36.86.06.87.27.76.15.06.18.28.36.98.78.27.17.67.87.26.67.27.99.48.811.910.29.77.37.48.47.85.57.08.09.76.5
Percentage of Assets0.10.20.20.20.10.20.20.20.10.20.10.20.10.20.20.20.10.20.20.10.10.20.20.20.20.30.20.20.10.20.20.10.10.10.20.20.1
Percentage of Assets aep:PublicServiceCoOfOklahoma2.12.82.72.52.02.82.52.82.02.32.12.32.12.72.72.42.12.62.42.22.12.42.73.12.94.33.12.82.22.62.42.11.62.32.42.92.1

aep:SouthwesternElectricPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value1021381271089812911712011816012012699117129136140150160138143175175145138152132107115126149155149181178172162
Percentage of AccountsPayableCurrent6.46.67.26.46.66.97.47.48.27.87.910.08.97.09.611.011.510.612.611.211.213.613.911.911.412.112.710.911.510.815.117.115.316.617.817.815.3
Percentage of Assets0.10.20.20.10.10.20.20.20.20.20.20.20.20.20.20.20.20.20.30.20.20.30.30.30.20.30.20.20.20.20.30.30.30.30.30.30.3
Percentage of Assets aep:SouthwesternElectricPowerCo1.31.81.61.41.31.71.51.61.62.21.61.71.31.51.71.91.92.12.31.92.02.62.62.22.12.32.11.71.82.02.42.62.53.23.33.23.1

Taxes Payable Current

us-gaap:TaxesPayableCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value125513578831046115612187749431081111571689110781048666814899979748749846871769692803822590680727747512617679717501597669702632
Percentage of TaxesPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.61.81.21.41.61.81.11.41.61.71.11.41.71.71.11.31.41.61.21.21.41.51.31.21.41.51.11.21.31.41.01.21.31.41.01.21.31.41.3

dei:LegalEntity

aep:AEPTexasInc.



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value10984108102112759089897768
Percentage of TaxesPayableCurrent8.76.312.39.89.76.211.79.58.36.96.5
Percentage of Assets0.10.10.10.10.20.10.10.10.10.10.1
Percentage of Assets aep:AEPTexasInc.1.00.81.11.01.10.81.01.01.00.90.9

aep:AEPTransmissionCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value308355172223242288138181185225112149191
Percentage of TaxesPayableCurrent24.626.219.521.421.023.717.919.317.120.215.716.718.3
Percentage of Assets0.40.50.20.30.30.40.20.30.30.30.20.20.3
Percentage of Assets aep:AEPTransmissionCo3.03.61.82.52.83.41.72.42.63.21.72.53.6

aep:AppalachianPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value10299588492898194119946478118107517210879459914010961951151146680827455857963557075
Percentage of TaxesPayableCurrent8.27.36.68.18.07.310.510.011.08.58.98.811.010.37.88.912.18.16.113.316.712.68.013.914.414.011.411.811.410.010.813.911.78.811.011.710.8
Percentage of Assets0.10.10.10.10.10.10.10.10.20.10.10.10.20.20.10.10.20.10.10.20.20.20.10.20.20.20.10.10.20.10.10.20.10.10.10.10.1
Percentage of Assets aep:AppalachianPowerCo0.80.80.50.70.70.70.70.81.00.80.50.61.00.90.40.60.90.70.40.91.21.00.50.91.01.00.60.80.80.70.50.80.80.60.50.70.8

aep:IndianaMichiganPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value13711257891019044768981437189774370837458688272586783734566806743637865996562
Percentage of TaxesPayableCurrent10.98.36.68.68.87.45.88.18.37.36.18.18.37.46.68.79.27.67.99.29.88.47.69.710.48.97.79.811.09.18.610.311.69.119.810.98.9
Percentage of Assets0.20.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.20.10.1
Percentage of Assets aep:IndianaMichiganPowerCo1.31.00.50.80.90.90.40.80.90.80.40.70.90.80.50.80.90.90.70.81.00.80.70.81.00.90.60.81.00.90.60.81.10.91.40.90.9

aep:OhioPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value449587294370423537293341418512251315413520246303379528285320360420238276324429261324361467249327365450129172229
Percentage of TaxesPayableCurrent35.843.333.335.436.644.238.036.238.745.935.135.438.349.637.037.342.154.038.142.842.648.331.040.040.452.244.347.749.762.648.753.153.862.825.928.932.7
Percentage of Assets0.60.80.40.50.60.80.40.50.60.80.40.50.70.80.40.50.60.90.50.50.60.70.40.50.60.80.50.60.70.90.50.60.70.90.30.30.5
Percentage of Assets aep:OhioPowerCo5.57.33.94.95.67.24.14.75.77.13.64.55.97.33.74.65.57.44.14.65.05.83.64.14.76.02.12.62.83.61.92.52.83.51.52.02.6

aep:PublicServiceCoOfOklahoma



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value42224340422240404222404042213938382336363620453444235542402859534021674325
Percentage of TaxesPayableCurrent3.41.74.93.93.71.85.24.23.92.05.74.54.02.05.94.74.32.44.94.84.32.46.05.05.62.99.56.25.53.811.68.75.93.013.67.33.6
Percentage of Assets0.10.00.10.10.10.00.10.10.10.00.10.10.10.00.10.10.10.00.10.10.10.00.10.10.10.00.10.10.10.10.10.10.10.00.10.10.1
Percentage of Assets aep:PublicServiceCoOfOklahoma0.90.50.90.90.90.50.90.90.90.50.90.91.00.50.90.90.90.60.90.90.90.51.20.91.20.71.61.21.20.81.71.61.20.72.01.30.8

aep:SouthwesternElectricPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value93419489914275809139737884407476825883748543707183416463693153545744686230
Percentage of TaxesPayableCurrent7.43.110.78.57.93.59.78.58.43.510.28.87.93.911.19.39.26.011.110.010.15.09.110.410.55.010.99.49.64.210.48.88.46.213.610.54.3
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of Assets aep:SouthwesternElectricPowerCo1.20.51.21.21.20.60.91.11.20.51.01.01.10.51.01.01.10.81.21.01.20.61.01.11.30.61.01.01.10.50.90.91.00.81.21.20.6

Other Liabilities Current

us-gaap:OtherLiabilitiesCurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value103413731032103888811901128938960103395398510081302101910381055130512341059100012501119101091796584182381196810378708539901004942930952931
Percentage of OtherLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.31.81.41.41.31.71.71.41.51.61.51.61.62.11.71.61.72.12.01.71.72.11.91.81.61.71.51.51.51.81.91.61.61.92.01.91.81.91.9

dei:LegalEntity

aep:AEPTexasInc.



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value104188858582989981707694
Percentage of OtherLiabilitiesCurrent10.113.78.28.29.38.38.88.77.47.47.3
Percentage of Assets0.10.20.10.10.10.10.10.10.10.10.1
Percentage of Assets aep:AEPTexasInc.1.01.80.80.80.81.01.10.90.80.91.2

aep:AEPTransmissionCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value17142530203472410910
Percentage of OtherLiabilitiesCurrent1.61.12.52.92.30.30.40.70.30.41.11.00.8
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets aep:AEPTransmissionCo0.20.10.30.30.20.00.10.10.00.10.20.20.2

aep:AppalachianPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value90170107108103191151891111099910788170127144120153182142113145948476978897841101058881105909693
Percentage of OtherLiabilitiesCurrent8.712.410.410.511.716.113.49.611.610.510.410.98.813.112.513.911.411.814.813.411.311.68.58.48.310.110.511.910.411.410.210.29.610.79.010.29.8
Percentage of Assets0.10.20.10.10.10.30.20.10.20.20.20.20.10.30.20.20.20.20.30.20.20.20.20.10.10.20.20.20.20.20.20.20.20.20.20.20.2
Percentage of Assets aep:AppalachianPowerCo0.71.30.90.90.81.61.30.70.90.90.80.90.71.41.11.21.01.31.61.21.01.30.80.80.70.90.90.90.81.11.00.90.81.00.91.00.9

aep:IndianaMichiganPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value70109857168103129861021061149910112313111911814215111212215016713714613913110211312215485102117143129140
Percentage of OtherLiabilitiesCurrent6.88.08.36.97.78.711.59.210.710.312.010.110.09.512.911.511.210.912.310.612.312.015.013.616.014.415.712.414.012.614.99.812.011.914.313.714.8
Percentage of Assets0.10.10.10.10.10.10.20.10.20.20.20.20.20.20.20.20.20.20.20.20.20.30.30.20.30.20.20.20.20.20.30.20.20.20.30.30.3
Percentage of Assets aep:IndianaMichiganPowerCo0.61.00.80.70.61.01.30.91.01.11.21.01.11.31.51.31.31.61.81.31.41.72.01.71.81.71.61.31.41.62.01.11.41.62.01.82.0

aep:OhioPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value13915199181147214205187161165166185255236879711815414712815717914393128144201231231263267240246182939898
Percentage of OtherLiabilitiesCurrent13.511.09.617.516.618.018.219.916.816.117.418.825.318.18.59.311.311.812.012.115.714.312.89.214.015.023.928.128.527.225.827.628.818.49.310.510.4
Percentage of Assets0.20.20.10.30.20.30.30.30.20.30.30.30.40.40.10.20.20.30.20.20.30.30.20.20.20.30.40.40.40.50.50.40.50.30.20.20.2
Percentage of Assets aep:OhioPowerCo1.71.91.32.42.02.92.92.62.22.32.42.63.73.31.31.51.72.22.11.82.22.52.11.41.92.01.61.81.82.02.11.91.91.41.11.21.1

aep:PublicServiceCoOfOklahoma



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value78876764635056453444384134475562606456433758505080584750605039413743404338
Percentage of OtherLiabilitiesCurrent7.66.46.66.27.24.35.04.93.64.34.04.23.43.75.46.05.84.94.64.13.74.74.55.08.86.15.66.17.55.23.84.74.34.44.14.64.0
Percentage of Assets0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of Assets aep:PublicServiceCoOfOklahoma1.61.81.41.41.41.11.31.00.81.00.90.90.81.11.31.51.51.51.41.10.91.51.41.42.21.71.41.51.81.51.21.21.11.31.21.31.2

aep:SouthwesternElectricPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value871331081238710710193607877706283819086110816255104766861796366506465676760646667
Percentage of OtherLiabilitiesCurrent8.59.710.511.99.89.09.09.96.37.68.17.26.26.47.98.78.28.56.65.95.68.46.86.86.78.37.68.16.26.76.37.77.96.16.47.07.1
Percentage of Assets0.10.20.10.20.10.20.20.10.10.10.10.10.10.10.10.10.10.20.10.10.10.20.10.10.10.10.10.10.10.10.10.10.10.10.10.10.1
Percentage of Assets aep:SouthwesternElectricPowerCo1.11.71.41.61.11.41.31.20.81.11.00.90.81.11.11.21.21.51.20.90.81.51.11.00.91.21.01.00.81.01.11.11.11.11.21.21.3

Liabilities Noncurrent

us-gaap:LiabilitiesNoncurrent



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value459434557145153446434338840985400433896637538381323852836491361003654936319370423712236669363323684635662348423359633435341003421633508329233295432307317423200631703309473079030866307323025529820
Percentage of LiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets59.160.061.161.561.459.659.258.357.258.960.258.258.557.659.158.559.459.459.560.559.458.458.058.059.860.761.059.960.459.459.059.959.959.360.260.860.860.061.7

dei:LegalEntity

aep:AEPTexasInc.



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value65956600626660995713576357846082563857325254
Percentage of LiabilitiesNoncurrent14.414.513.913.713.214.114.415.615.015.014.4
Percentage of Assets8.58.78.58.48.18.48.69.18.68.98.3
Percentage of Assets aep:AEPTexasInc.62.462.361.160.658.060.062.366.263.365.368.2

aep:AEPTransmissionCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-31
Value4816478847244357400839824035368036263626371330142842
Percentage of LiabilitiesNoncurrent10.510.510.59.89.29.710.19.49.79.59.68.37.8
Percentage of Assets6.26.36.46.05.75.86.05.55.55.65.84.84.5
Percentage of Assets aep:AEPTransmissionCo47.248.450.549.146.547.450.548.950.151.356.750.753.1

aep:AppalachianPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value6973736974087504741469306869695170056999753275107150711370456962705770476954702865806590652965186887699561736089605760415988599459605917603763145802
Percentage of LiabilitiesNoncurrent15.216.216.416.817.116.917.217.818.718.419.620.619.819.519.418.819.019.219.119.118.518.919.419.520.220.418.418.518.418.718.918.718.819.119.620.519.2
Percentage of Assets9.09.710.010.310.510.110.210.410.710.811.812.011.611.211.511.011.311.411.411.511.011.111.311.312.112.411.211.111.111.111.111.211.311.311.812.411.5
Percentage of Assets aep:AppalachianPowerCo54.557.759.060.159.256.457.057.058.058.762.162.159.659.459.959.160.360.561.061.758.158.758.358.260.361.959.858.658.157.558.058.358.157.559.362.958.0

aep:IndianaMichiganPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value7468780976947666759871717144659758426343646463686327623462906247613156365625573256055609549955075467547656385602559252315104509549944899477947904745
Percentage of LiabilitiesNoncurrent16.317.117.017.217.517.517.816.915.616.616.817.517.517.117.316.916.515.415.515.615.716.116.416.516.016.016.817.017.016.216.115.915.815.815.515.515.7
Percentage of Assets9.610.310.410.610.710.410.69.98.99.810.110.210.39.810.29.99.89.19.29.49.39.49.59.69.69.710.310.210.39.69.59.59.49.49.39.49.4
Percentage of Assets aep:IndianaMichiganPowerCo68.569.570.070.070.670.270.765.659.364.966.266.466.966.769.369.069.164.765.266.064.864.766.066.266.266.368.968.869.466.866.567.266.666.366.467.266.4

aep:OhioPowerCo



Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value4576423742934296390437903771383137163357349334923785379438443733372537253771380141554151405240764146411465316221637163556536676567447060468546954666
Percentage of LiabilitiesNoncurrent10.09.39.59.69.09.29.49.89.98.89.19.610.510.410.610.110.010.210.410.311.711.912.112.212.212.01