Company Quick10K Filing
⚲
American Electric Power
Financials
Price94.59 EPS4
Shares495 P/E22
MCap46,866 P/FCF37
Net Debt29,239 EBIT3,092
TEV76,105 TEV/EBIT25
TTM 2019-09-30, in MM, except price, ratios
Filings
10-Q 2020-03-31 Filed 2020-05-06
10-K 2019-12-31 Filed 2020-02-20
10-Q 2019-09-30 Filed 2019-10-24
10-Q 2019-06-30 Filed 2019-07-25
10-Q 2019-03-31 Filed 2019-04-26
10-K 2018-12-31 Filed 2019-02-21
10-Q 2018-09-30 Filed 2018-10-25
10-Q 2018-06-30 Filed 2018-07-26
10-Q 2018-03-31 Filed 2018-04-26
10-K 2017-12-31 Filed 2018-02-23
10-Q 2017-09-30 Filed 2017-10-27
10-Q 2017-06-30 Filed 2017-07-27
10-Q 2017-03-31 Filed 2017-04-28
10-K 2016-12-31 Filed 2017-02-28
10-Q 2016-09-30 Filed 2016-11-02
10-Q 2016-06-30 Filed 2016-07-28
10-Q 2016-03-31 Filed 2016-04-28
10-K 2015-12-31 Filed 2016-02-24
10-Q 2015-09-30 Filed 2015-10-22
10-Q 2015-06-30 Filed 2015-07-23
10-Q 2015-03-31 Filed 2015-04-23
10-K 2014-12-31 Filed 2015-02-20
10-Q 2014-09-30 Filed 2014-10-23
10-Q 2014-06-30 Filed 2014-07-25
10-Q 2014-03-31 Filed 2014-04-25
10-K 2013-12-31 Filed 2014-02-25
10-Q 2013-09-30 Filed 2013-10-25
10-Q 2013-06-30 Filed 2013-07-26
10-Q 2013-03-31 Filed 2013-04-26
10-K 2012-12-31 Filed 2013-02-26
10-Q 2012-09-30 Filed 2012-10-26
10-Q 2012-06-30 Filed 2012-07-27
10-Q 2012-03-31 Filed 2012-04-27
10-K 2011-12-31 Filed 2012-02-28
10-Q 2011-09-30 Filed 2011-10-28
10-Q 2011-06-30 Filed 2011-07-29
10-Q 2011-03-31 Filed 2011-05-03
10-K 2010-12-31 Filed 2011-02-25
10-Q 2010-09-30 Filed 2010-11-01
10-Q 2010-06-30 Filed 2010-07-30
10-Q 2010-03-31 Filed 2010-04-30
10-K 2009-12-31 Filed 2010-02-26
Reports
8-K 2020-05-06
8-K 2020-04-21
8-K 2020-03-30
8-K 2020-03-23
8-K 2020-03-03
8-K 2020-02-20
8-K 2019-12-03
8-K 2019-10-24
8-K 2019-09-17
8-K 2019-07-25
8-K 2019-04-25
8-K 2019-04-23
8-K 2019-03-14
8-K 2019-01-24
8-K 2018-11-30
8-K 2018-10-25
8-K 2018-10-17
8-K 2018-07-25
8-K 2018-04-26
8-K 2018-04-24
8-K 2018-01-25
8-K 2015-09-24
8-K 2015-09-02
8-K 2015-07-23
8-K 2015-06-23
8-K 2015-04-23
8-K 2015-04-21
8-K 2015-03-03
8-K 2015-01-28
8-K 2015-01-08

AEP 10Q Quarterly Report

Content
Part II. Other Information
Item 1. Legal Proceedings
Item 1A. Risk Factors
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds
Item 3. Defaults Upon Senior Securities
Item 4. Mine Safety Disclosures
Item 5. Other Information
Item 6. Exhibits
Exhibits
EX-4.3 ex4320201q.htm
EX-31.A ex31aaep20201q.htm
EX-31.A ex31aaeptco20201q.htm
EX-31.A ex31aaeptexas20201q.htm
EX-31.A ex31aapco20201q.htm
EX-31.A ex31aim20201q.htm
EX-31.A ex31aopco20201q.htm
EX-31.A ex31apso20201q.htm
EX-31.A ex31aswepco20201q.htm
EX-31.B ex31baep20201q.htm
EX-31.B ex31baeptco20201q.htm
EX-31.B ex31baeptexas20201q.htm
EX-31.B ex31bapco20201q.htm
EX-31.B ex31bim20201q.htm
EX-31.B ex31bopco20201q.htm
EX-31.B ex31bpso20201q.htm
EX-31.B ex31bswepco20201q.htm
EX-32.A ex32aaep20201q.htm
EX-32.A ex32aaeptco20201q.htm
EX-32.A ex32aaeptexas20201q.htm
EX-32.A ex32aapco20201q.htm
EX-32.A ex32aim20201q.htm
EX-32.A ex32aopco20201q.htm
EX-32.A ex32apso20201q.htm
EX-32.A ex32aswepco20201q.htm
EX-32.B ex32baep20201q.htm
EX-32.B ex32baeptco20201q.htm
EX-32.B ex32baeptexas20201q.htm
EX-32.B ex32bapco20201q.htm
EX-32.B ex32bim20201q.htm
EX-32.B ex32bopco20201q.htm
EX-32.B ex32bpso20201q.htm
EX-32.B ex32bswepco20201q.htm
EX-95 ex9520201q.htm

American Electric Power Earnings 2020-03-31

Balance SheetIncome StatementCash Flow
756045301502012201420172020
Assets, Equity
 4.83.82.91.91.00.02012201420172020
Rev, G Profit, Net Income
 3.92.20.5-1.2-2.9-4.62012201420172020
Ops, Inv, Fin
Document
1000000000100000000062300000061600000050000000VariableVariableVariableVariableVariableVariableVariableVariableVaraible20502023202020252023202320222022202120242025202020222030202720322023202320502030205020220.03020.03020.03020.03020.03020.03020.03020.02240.02240.02240.02240.02240.02240.02240.6750.6750.6750.6750.6750.6750.02730.02730.02730.02730.02730.02730.02730.01760.01760.01760.01760.01760.01760.0176323000000324000000false--12-31Q1202000000049040001721781000170249400000068790000050172000007398600000810270000092487☐☐☐☐☐☐Non-accelerated FilerNon-accelerated FilerNon-accelerated FilerNon-accelerated FilerNon-accelerated FilerNon-accelerated FilerNon-accelerated Filer☐☐☐☐☐☐107500000112000000069700023890000031260000028250000040450000012300000109000001380000017000000120590000011444000000530000061500000700000555000009065000007776000000600000012890000015000001214000000.670.7000006.5015186.50151860000000030000000250000040000000110000007600000600000000300000002500000400000001100000076000005143736311048200051541184710482000134995001400000279524739013000753664013499500140000027952473901300075366400.05310.02060.02010.06000.02600.03000.04580.02750.02300.03250.03290.02982020202175000004900000470000004200000028140000086100000565100000178300000800000002896000004954000009070000004847000001037600000183000003050000077000001000001000001000001000001000001000001780000010000011000001000000100000100000400000200000010000050000030000001000002310000023300000790000000160000079000002000006100000740000000160000074000002000005600000750000013030000062600000011190000061240000021230000021350000015470000018580000010010000011620000062120000056070000018780000016360000020204160202041601149000000801000000500000023000000 0000004904 2020-01-01 2020-03-31 0000004904 aep:AEPTexasInc.Member 2020-01-01 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember 2020-01-01 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember 2020-01-01 2020-03-31 0000004904 aep:OhioPowerCoMember 2020-01-01 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember 2020-01-01 2020-03-31 0000004904 aep:AppalachianPowerCoMember 2020-01-01 2020-03-31 0000004904 aep:AEPTransmissionCoMember 2020-01-01 2020-03-31 0000004904 exch:XNYS us-gaap:PreferredStockMember 2020-01-01 2020-03-31 0000004904 exch:XNYS us-gaap:CommonStockMember 2020-01-01 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember 2020-05-06 0000004904 aep:SouthwesternElectricPowerCoMember 2020-05-06 0000004904 2020-05-06 0000004904 aep:AppalachianPowerCoMember 2020-05-06 0000004904 aep:OhioPowerCoMember 2020-05-06 0000004904 aep:AEPTexasInc.Member 2020-05-06 0000004904 aep:IndianaMichiganPowerCoMember 2020-05-06 0000004904 2019-01-01 2019-03-31 0000004904 us-gaap:ElectricityPurchasedMember 2020-01-01 2020-03-31 0000004904 aep:TransmissionandDistributionUtilitiesRevenuesMember 2019-01-01 2019-03-31 0000004904 us-gaap:ElectricityGenerationMember 2019-01-01 2019-03-31 0000004904 us-gaap:ElectricityPurchasedMember 2019-01-01 2019-03-31 0000004904 aep:GenerationAndMarketingRevenuesMember 2019-01-01 2019-03-31 0000004904 aep:OtherRevenuesMember 2020-01-01 2020-03-31 0000004904 us-gaap:ElectricityMember 2020-01-01 2020-03-31 0000004904 aep:TransmissionandDistributionUtilitiesRevenuesMember 2020-01-01 2020-03-31 0000004904 aep:GenerationAndMarketingRevenuesMember 2020-01-01 2020-03-31 0000004904 aep:OtherRevenuesMember 2019-01-01 2019-03-31 0000004904 us-gaap:ElectricityGenerationMember 2020-01-01 2020-03-31 0000004904 us-gaap:ElectricityMember 2019-01-01 2019-03-31 0000004904 us-gaap:CommonStockMember 2020-01-01 2020-03-31 0000004904 us-gaap:RetainedEarningsMember 2018-12-31 0000004904 us-gaap:AdditionalPaidInCapitalMember 2019-01-01 2019-03-31 0000004904 us-gaap:CommonStockMember 2019-12-31 0000004904 us-gaap:AdditionalPaidInCapitalMember 2019-12-31 0000004904 us-gaap:RetainedEarningsMember 2019-03-31 0000004904 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2020-01-01 2020-03-31 0000004904 us-gaap:NoncontrollingInterestMember 2018-12-31 0000004904 2018-12-31 0000004904 us-gaap:NoncontrollingInterestMember 2019-01-01 2019-03-31 0000004904 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2020-03-31 0000004904 us-gaap:CommonStockMember 2019-03-31 0000004904 us-gaap:NoncontrollingInterestMember 2020-01-01 2020-03-31 0000004904 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2019-03-31 0000004904 us-gaap:CommonStockMember 2018-12-31 0000004904 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2019-12-31 0000004904 us-gaap:AdditionalPaidInCapitalMember 2020-03-31 0000004904 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2018-12-31 0000004904 us-gaap:RetainedEarningsMember 2020-01-01 2020-03-31 0000004904 us-gaap:RetainedEarningsMember 2019-01-01 2019-03-31 0000004904 us-gaap:AdditionalPaidInCapitalMember 2020-01-01 2020-03-31 0000004904 us-gaap:RetainedEarningsMember 2020-03-31 0000004904 2019-03-31 0000004904 us-gaap:RetainedEarningsMember 2019-12-31 0000004904 us-gaap:CommonStockMember 2019-01-01 2019-03-31 0000004904 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2019-01-01 2019-03-31 0000004904 us-gaap:NoncontrollingInterestMember 2019-12-31 0000004904 us-gaap:AdditionalPaidInCapitalMember 2019-03-31 0000004904 us-gaap:NoncontrollingInterestMember 2019-03-31 0000004904 us-gaap:NoncontrollingInterestMember 2020-03-31 0000004904 us-gaap:CommonStockMember 2020-03-31 0000004904 us-gaap:AdditionalPaidInCapitalMember 2018-12-31 0000004904 2020-03-31 0000004904 2019-12-31 0000004904 srt:SubsidiariesMember 2019-12-31 0000004904 srt:SubsidiariesMember 2020-03-31 0000004904 aep:AEPTexasInc.Member 2019-01-01 2019-03-31 0000004904 aep:AEPTexasInc.Member aep:TransmissionandDistributionUtilitiesRevenuesMember 2020-01-01 2020-03-31 0000004904 aep:AEPTexasInc.Member aep:TransmissionandDistributionUtilitiesRevenuesMember 2019-01-01 2019-03-31 0000004904 aep:AEPTexasInc.Member us-gaap:ElectricityGenerationMember 2019-01-01 2019-03-31 0000004904 aep:AEPTexasInc.Member aep:OtherRevenuesMember 2020-01-01 2020-03-31 0000004904 aep:AEPTexasInc.Member us-gaap:ElectricityGenerationMember 2020-01-01 2020-03-31 0000004904 aep:AEPTexasInc.Member aep:OtherRevenuesMember 2019-01-01 2019-03-31 0000004904 aep:AEPTexasInc.Member 2020-03-31 0000004904 aep:AEPTexasInc.Member 2018-12-31 0000004904 aep:AEPTexasInc.Member us-gaap:AccumulatedOtherComprehensiveIncomeMember 2020-01-01 2020-03-31 0000004904 aep:AEPTexasInc.Member us-gaap:AdditionalPaidInCapitalMember 2019-03-31 0000004904 aep:AEPTexasInc.Member us-gaap:AccumulatedOtherComprehensiveIncomeMember 2020-03-31 0000004904 aep:AEPTexasInc.Member us-gaap:AccumulatedOtherComprehensiveIncomeMember 2019-12-31 0000004904 aep:AEPTexasInc.Member us-gaap:AccumulatedOtherComprehensiveIncomeMember 2019-03-31 0000004904 aep:AEPTexasInc.Member us-gaap:AccumulatedOtherComprehensiveIncomeMember 2018-12-31 0000004904 aep:AEPTexasInc.Member us-gaap:AdditionalPaidInCapitalMember 2019-01-01 2019-03-31 0000004904 aep:AEPTexasInc.Member us-gaap:RetainedEarningsMember 2019-03-31 0000004904 aep:AEPTexasInc.Member us-gaap:AdditionalPaidInCapitalMember 2018-12-31 0000004904 aep:AEPTexasInc.Member us-gaap:AdditionalPaidInCapitalMember 2020-03-31 0000004904 aep:AEPTexasInc.Member 2019-03-31 0000004904 aep:AEPTexasInc.Member 2019-12-31 0000004904 aep:AEPTexasInc.Member us-gaap:AccumulatedOtherComprehensiveIncomeMember 2019-01-01 2019-03-31 0000004904 aep:AEPTexasInc.Member us-gaap:RetainedEarningsMember 2020-01-01 2020-03-31 0000004904 aep:AEPTexasInc.Member us-gaap:RetainedEarningsMember 2019-12-31 0000004904 aep:AEPTexasInc.Member us-gaap:RetainedEarningsMember 2020-03-31 0000004904 aep:AEPTexasInc.Member us-gaap:RetainedEarningsMember 2019-01-01 2019-03-31 0000004904 aep:AEPTexasInc.Member us-gaap:RetainedEarningsMember 2018-12-31 0000004904 aep:AEPTexasInc.Member us-gaap:AdditionalPaidInCapitalMember 2019-12-31 0000004904 aep:AEPTexasInc.Member aep:AEPTexasTransitionFundingandRestorationFundingMember 2019-12-31 0000004904 aep:AEPTexasInc.Member aep:AEPTexasTransitionFundingandRestorationFundingMember 2020-03-31 0000004904 aep:AEPTransmissionCoMember 2019-01-01 2019-03-31 0000004904 aep:AEPTransmissionCoMember us-gaap:ElectricTransmissionMember 2019-01-01 2019-03-31 0000004904 aep:AEPTransmissionCoMember us-gaap:ElectricTransmissionMember 2020-01-01 2020-03-31 0000004904 aep:AEPTransmissionCoMember aep:OtherRevenuesMember 2020-01-01 2020-03-31 0000004904 aep:AEPTransmissionCoMember aep:OtherRevenuesMember 2019-01-01 2019-03-31 0000004904 aep:AEPTransmissionCoMember us-gaap:RetainedEarningsMember 2020-01-01 2020-03-31 0000004904 aep:AEPTransmissionCoMember us-gaap:RetainedEarningsMember 2019-12-31 0000004904 aep:AEPTransmissionCoMember us-gaap:RetainedEarningsMember 2019-01-01 2019-03-31 0000004904 aep:AEPTransmissionCoMember 2019-12-31 0000004904 aep:AEPTransmissionCoMember us-gaap:AdditionalPaidInCapitalMember 2019-12-31 0000004904 aep:AEPTransmissionCoMember us-gaap:RetainedEarningsMember 2018-12-31 0000004904 aep:AEPTransmissionCoMember us-gaap:RetainedEarningsMember 2020-03-31 0000004904 aep:AEPTransmissionCoMember 2019-03-31 0000004904 aep:AEPTransmissionCoMember us-gaap:AdditionalPaidInCapitalMember 2020-03-31 0000004904 aep:AEPTransmissionCoMember us-gaap:AdditionalPaidInCapitalMember 2019-03-31 0000004904 aep:AEPTransmissionCoMember 2020-03-31 0000004904 aep:AEPTransmissionCoMember us-gaap:AdditionalPaidInCapitalMember 2020-01-01 2020-03-31 0000004904 aep:AEPTransmissionCoMember us-gaap:RetainedEarningsMember 2019-03-31 0000004904 aep:AEPTransmissionCoMember 2018-12-31 0000004904 aep:AEPTransmissionCoMember us-gaap:AdditionalPaidInCapitalMember 2018-12-31 0000004904 aep:AppalachianPowerCoMember us-gaap:ElectricityMember 2020-01-01 2020-03-31 0000004904 aep:AppalachianPowerCoMember us-gaap:ElectricityMember 2019-01-01 2019-03-31 0000004904 aep:AppalachianPowerCoMember 2019-01-01 2019-03-31 0000004904 aep:AppalachianPowerCoMember aep:OtherRevenuesMember 2020-01-01 2020-03-31 0000004904 aep:AppalachianPowerCoMember aep:OtherRevenuesMember 2019-01-01 2019-03-31 0000004904 aep:AppalachianPowerCoMember us-gaap:ElectricityPurchasedMember 2019-01-01 2019-03-31 0000004904 aep:AppalachianPowerCoMember us-gaap:ElectricityGenerationMember 2020-01-01 2020-03-31 0000004904 aep:AppalachianPowerCoMember us-gaap:ElectricityPurchasedMember 2020-01-01 2020-03-31 0000004904 aep:AppalachianPowerCoMember us-gaap:ElectricityGenerationMember 2019-01-01 2019-03-31 0000004904 aep:AppalachianPowerCoMember us-gaap:AdditionalPaidInCapitalMember 2019-03-31 0000004904 aep:AppalachianPowerCoMember us-gaap:RetainedEarningsMember 2020-01-01 2020-03-31 0000004904 aep:AppalachianPowerCoMember us-gaap:CommonStockMember 2019-12-31 0000004904 aep:AppalachianPowerCoMember us-gaap:CommonStockMember 2019-03-31 0000004904 aep:AppalachianPowerCoMember us-gaap:CommonStockMember 2020-03-31 0000004904 aep:AppalachianPowerCoMember us-gaap:AccumulatedOtherComprehensiveIncomeMember 2019-12-31 0000004904 aep:AppalachianPowerCoMember us-gaap:RetainedEarningsMember 2019-01-01 2019-03-31 0000004904 aep:AppalachianPowerCoMember us-gaap:AccumulatedOtherComprehensiveIncomeMember 2019-01-01 2019-03-31 0000004904 aep:AppalachianPowerCoMember us-gaap:RetainedEarningsMember 2019-03-31 0000004904 aep:AppalachianPowerCoMember us-gaap:RetainedEarningsMember 2020-03-31 0000004904 aep:AppalachianPowerCoMember 2019-12-31 0000004904 aep:AppalachianPowerCoMember 2020-03-31 0000004904 aep:AppalachianPowerCoMember us-gaap:AccumulatedOtherComprehensiveIncomeMember 2018-12-31 0000004904 aep:AppalachianPowerCoMember us-gaap:AccumulatedOtherComprehensiveIncomeMember 2019-03-31 0000004904 aep:AppalachianPowerCoMember 2019-03-31 0000004904 aep:AppalachianPowerCoMember us-gaap:AccumulatedOtherComprehensiveIncomeMember 2020-01-01 2020-03-31 0000004904 aep:AppalachianPowerCoMember 2018-12-31 0000004904 aep:AppalachianPowerCoMember us-gaap:RetainedEarningsMember 2019-12-31 0000004904 aep:AppalachianPowerCoMember us-gaap:CommonStockMember 2018-12-31 0000004904 aep:AppalachianPowerCoMember us-gaap:AdditionalPaidInCapitalMember 2019-12-31 0000004904 aep:AppalachianPowerCoMember us-gaap:AdditionalPaidInCapitalMember 2018-12-31 0000004904 aep:AppalachianPowerCoMember us-gaap:AccumulatedOtherComprehensiveIncomeMember 2020-03-31 0000004904 aep:AppalachianPowerCoMember us-gaap:AdditionalPaidInCapitalMember 2020-03-31 0000004904 aep:AppalachianPowerCoMember us-gaap:RetainedEarningsMember 2018-12-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:ElectricityGenerationMember 2019-01-01 2019-03-31 0000004904 aep:IndianaMichiganPowerCoMember 2019-01-01 2019-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:ElectricityGenerationMember 2020-01-01 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:OtherRevenuesMember 2020-01-01 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:OtherRevenuesMember 2019-01-01 2019-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:ElectricityPurchasedMember 2020-01-01 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:ElectricityPurchasedMember 2019-01-01 2019-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:ElectricityMember 2020-01-01 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:ElectricityMember 2019-01-01 2019-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:RetainedEarningsMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:AccumulatedOtherComprehensiveIncomeMember 2019-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:AccumulatedOtherComprehensiveIncomeMember 2020-01-01 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:AccumulatedOtherComprehensiveIncomeMember 2018-12-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:RetainedEarningsMember 2020-01-01 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:AdditionalPaidInCapitalMember 2019-12-31 0000004904 aep:IndianaMichiganPowerCoMember 2018-12-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:CommonStockMember 2019-12-31 0000004904 aep:IndianaMichiganPowerCoMember 2019-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:RetainedEarningsMember 2019-01-01 2019-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:CommonStockMember 2019-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:RetainedEarningsMember 2019-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:CommonStockMember 2018-12-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:RetainedEarningsMember 2018-12-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:CommonStockMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:AdditionalPaidInCapitalMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:AccumulatedOtherComprehensiveIncomeMember 2019-12-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:AdditionalPaidInCapitalMember 2019-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:AccumulatedOtherComprehensiveIncomeMember 2019-01-01 2019-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:AdditionalPaidInCapitalMember 2018-12-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:RetainedEarningsMember 2019-12-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:AccumulatedOtherComprehensiveIncomeMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember 2019-12-31 0000004904 aep:IndianaMichiganPowerCoMember aep:DccFuelMember 2019-12-31 0000004904 aep:IndianaMichiganPowerCoMember aep:DccFuelMember 2020-03-31 0000004904 aep:OhioPowerCoMember aep:TransmissionandDistributionUtilitiesRevenuesMember 2020-01-01 2020-03-31 0000004904 aep:OhioPowerCoMember 2019-01-01 2019-03-31 0000004904 aep:OhioPowerCoMember aep:OtherRevenuesMember 2019-01-01 2019-03-31 0000004904 aep:OhioPowerCoMember aep:TransmissionandDistributionUtilitiesRevenuesMember 2019-01-01 2019-03-31 0000004904 aep:OhioPowerCoMember us-gaap:ElectricityPurchasedMember 2020-01-01 2020-03-31 0000004904 aep:OhioPowerCoMember aep:OtherRevenuesMember 2020-01-01 2020-03-31 0000004904 aep:OhioPowerCoMember us-gaap:ElectricityPurchasedMember 2019-01-01 2019-03-31 0000004904 aep:OhioPowerCoMember us-gaap:CommonStockMember 2019-12-31 0000004904 aep:OhioPowerCoMember 2020-03-31 0000004904 aep:OhioPowerCoMember us-gaap:AdditionalPaidInCapitalMember 2018-12-31 0000004904 aep:OhioPowerCoMember us-gaap:AccumulatedOtherComprehensiveIncomeMember 2019-01-01 2019-03-31 0000004904 aep:OhioPowerCoMember us-gaap:AccumulatedOtherComprehensiveIncomeMember 2019-12-31 0000004904 aep:OhioPowerCoMember us-gaap:RetainedEarningsMember 2020-01-01 2020-03-31 0000004904 aep:OhioPowerCoMember us-gaap:RetainedEarningsMember 2019-12-31 0000004904 aep:OhioPowerCoMember us-gaap:RetainedEarningsMember 2020-03-31 0000004904 aep:OhioPowerCoMember us-gaap:AdditionalPaidInCapitalMember 2019-03-31 0000004904 aep:OhioPowerCoMember us-gaap:AdditionalPaidInCapitalMember 2019-12-31 0000004904 aep:OhioPowerCoMember 2018-12-31 0000004904 aep:OhioPowerCoMember 2019-12-31 0000004904 aep:OhioPowerCoMember us-gaap:AdditionalPaidInCapitalMember 2020-03-31 0000004904 aep:OhioPowerCoMember us-gaap:RetainedEarningsMember 2019-03-31 0000004904 aep:OhioPowerCoMember us-gaap:AccumulatedOtherComprehensiveIncomeMember 2018-12-31 0000004904 aep:OhioPowerCoMember 2019-03-31 0000004904 aep:OhioPowerCoMember us-gaap:RetainedEarningsMember 2019-01-01 2019-03-31 0000004904 aep:OhioPowerCoMember us-gaap:CommonStockMember 2019-03-31 0000004904 aep:OhioPowerCoMember us-gaap:AccumulatedOtherComprehensiveIncomeMember 2019-03-31 0000004904 aep:OhioPowerCoMember us-gaap:CommonStockMember 2020-03-31 0000004904 aep:OhioPowerCoMember us-gaap:AccumulatedOtherComprehensiveIncomeMember 2020-03-31 0000004904 aep:OhioPowerCoMember us-gaap:RetainedEarningsMember 2018-12-31 0000004904 aep:OhioPowerCoMember us-gaap:CommonStockMember 2018-12-31 0000004904 aep:PublicServiceCoOfOklahomaMember 2019-01-01 2019-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember us-gaap:ElectricityGenerationMember 2019-01-01 2019-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember us-gaap:ElectricityPurchasedMember 2020-01-01 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember us-gaap:ElectricityMember 2020-01-01 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember us-gaap:ElectricityGenerationMember 2020-01-01 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:OtherRevenuesMember 2020-01-01 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:OtherRevenuesMember 2019-01-01 2019-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember us-gaap:ElectricityPurchasedMember 2019-01-01 2019-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember us-gaap:ElectricityMember 2019-01-01 2019-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember us-gaap:RetainedEarningsMember 2019-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember us-gaap:CommonStockMember 2019-12-31 0000004904 aep:PublicServiceCoOfOklahomaMember us-gaap:AdditionalPaidInCapitalMember 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember us-gaap:CommonStockMember 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember us-gaap:AdditionalPaidInCapitalMember 2018-12-31 0000004904 aep:PublicServiceCoOfOklahomaMember us-gaap:RetainedEarningsMember 2018-12-31 0000004904 aep:PublicServiceCoOfOklahomaMember us-gaap:CommonStockMember 2018-12-31 0000004904 aep:PublicServiceCoOfOklahomaMember us-gaap:AccumulatedOtherComprehensiveIncomeMember 2019-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember us-gaap:RetainedEarningsMember 2019-12-31 0000004904 aep:PublicServiceCoOfOklahomaMember us-gaap:AdditionalPaidInCapitalMember 2019-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember us-gaap:RetainedEarningsMember 2019-01-01 2019-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember 2019-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember us-gaap:AccumulatedOtherComprehensiveIncomeMember 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember us-gaap:RetainedEarningsMember 2020-01-01 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember us-gaap:AccumulatedOtherComprehensiveIncomeMember 2020-01-01 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember us-gaap:AdditionalPaidInCapitalMember 2019-12-31 0000004904 aep:PublicServiceCoOfOklahomaMember 2019-12-31 0000004904 aep:PublicServiceCoOfOklahomaMember 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember us-gaap:AccumulatedOtherComprehensiveIncomeMember 2019-01-01 2019-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember us-gaap:AccumulatedOtherComprehensiveIncomeMember 2019-12-31 0000004904 aep:PublicServiceCoOfOklahomaMember us-gaap:AccumulatedOtherComprehensiveIncomeMember 2018-12-31 0000004904 aep:PublicServiceCoOfOklahomaMember us-gaap:RetainedEarningsMember 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember us-gaap:CommonStockMember 2019-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember 2018-12-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:ElectricityPurchasedMember 2019-01-01 2019-03-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:OtherRevenuesMember 2020-01-01 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:ElectricityGenerationMember 2019-01-01 2019-03-31 0000004904 aep:SouthwesternElectricPowerCoMember 2019-01-01 2019-03-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:ElectricityMember 2019-01-01 2019-03-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:ElectricityPurchasedMember 2020-01-01 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:OtherRevenuesMember 2019-01-01 2019-03-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:ElectricityGenerationMember 2020-01-01 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:ElectricityMember 2020-01-01 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:RetainedEarningsMember 2019-01-01 2019-03-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:AccumulatedOtherComprehensiveIncomeMember 2019-03-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:AccumulatedOtherComprehensiveIncomeMember 2018-12-31 0000004904 aep:SouthwesternElectricPowerCoMember 2019-12-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:AdditionalPaidInCapitalMember 2018-12-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:RetainedEarningsMember 2020-01-01 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:NoncontrollingInterestMember 2019-01-01 2019-03-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:RetainedEarningsMember 2019-03-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:NoncontrollingInterestMember 2020-01-01 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:CommonStockMember 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:NoncontrollingInterestMember 2019-03-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:AdditionalPaidInCapitalMember 2019-12-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:AccumulatedOtherComprehensiveIncomeMember 2019-01-01 2019-03-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:RetainedEarningsMember 2018-12-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:NoncontrollingInterestMember 2019-12-31 0000004904 aep:SouthwesternElectricPowerCoMember 2019-03-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:RetainedEarningsMember 2019-12-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:AccumulatedOtherComprehensiveIncomeMember 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember 2018-12-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:CommonStockMember 2018-12-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:RetainedEarningsMember 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:AdditionalPaidInCapitalMember 2019-03-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:NoncontrollingInterestMember 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:NoncontrollingInterestMember 2018-12-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:CommonStockMember 2019-03-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:AccumulatedOtherComprehensiveIncomeMember 2019-12-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:CommonStockMember 2019-12-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:AdditionalPaidInCapitalMember 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:SabineMiningCoMember 2019-12-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:SabineMiningCoMember 2020-03-31 0000004904 aep:RestrictedStockUnitsandPerformanceShareUnitsMember 2020-01-01 2020-03-31 0000004904 aep:RestrictedStockUnitsandPerformanceShareUnitsMember 2019-01-01 2019-03-31 0000004904 aep:InterestRateMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember aep:AppleBlossomandBlackOakMember 2020-01-01 2020-03-31 0000004904 aep:AEPTexasInc.Member aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2020-01-01 2020-03-31 0000004904 aep:AEPTexasInc.Member aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2020-03-31 0000004904 aep:AEPTexasInc.Member us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2020-01-01 2020-03-31 0000004904 aep:AEPTexasInc.Member us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2020-03-31 0000004904 aep:AEPTexasInc.Member us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2020-01-01 2020-03-31 0000004904 aep:AEPTexasInc.Member aep:InterestRateMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2020-01-01 2020-03-31 0000004904 aep:AEPTexasInc.Member us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2019-12-31 0000004904 aep:AEPTexasInc.Member us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember 2020-01-01 2020-03-31 0000004904 aep:AEPTexasInc.Member aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2019-12-31 0000004904 aep:AppalachianPowerCoMember aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2019-12-31 0000004904 aep:AppalachianPowerCoMember aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2020-01-01 2020-03-31 0000004904 aep:AppalachianPowerCoMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2020-01-01 2020-03-31 0000004904 aep:AppalachianPowerCoMember us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2019-12-31 0000004904 aep:AppalachianPowerCoMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember 2020-01-01 2020-03-31 0000004904 aep:AppalachianPowerCoMember us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2020-01-01 2020-03-31 0000004904 aep:AppalachianPowerCoMember aep:InterestRateMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2020-01-01 2020-03-31 0000004904 aep:AppalachianPowerCoMember aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2020-03-31 0000004904 aep:AppalachianPowerCoMember us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:InterestRateMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2019-01-01 2019-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2018-12-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2019-01-01 2019-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2019-03-31 0000004904 us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2019-12-31 0000004904 us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember 2020-01-01 2020-03-31 0000004904 us-gaap:ElectricityPurchasedMember aep:InterestRateMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2020-01-01 2020-03-31 0000004904 us-gaap:ElectricityPurchasedMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember 2020-01-01 2020-03-31 0000004904 us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2020-01-01 2020-03-31 0000004904 aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2020-01-01 2020-03-31 0000004904 us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2020-01-01 2020-03-31 0000004904 us-gaap:CommodityContractMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2020-01-01 2020-03-31 0000004904 us-gaap:CommodityContractMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2020-01-01 2020-03-31 0000004904 us-gaap:ElectricityPurchasedMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2020-01-01 2020-03-31 0000004904 aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2019-12-31 0000004904 us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2020-03-31 0000004904 us-gaap:CommodityContractMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2019-12-31 0000004904 aep:InterestRateMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2020-01-01 2020-03-31 0000004904 us-gaap:CommodityContractMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2020-03-31 0000004904 aep:GenerationAndMarketingRevenuesMember aep:InterestRateMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2020-01-01 2020-03-31 0000004904 aep:GenerationAndMarketingRevenuesMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2020-01-01 2020-03-31 0000004904 aep:GenerationAndMarketingRevenuesMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember 2020-01-01 2020-03-31 0000004904 aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2020-03-31 0000004904 us-gaap:ElectricityPurchasedMember us-gaap:CommodityContractMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2020-01-01 2020-03-31 0000004904 aep:GenerationAndMarketingRevenuesMember us-gaap:CommodityContractMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2020-01-01 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:InterestRateMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2019-01-01 2019-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2019-01-01 2019-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2018-12-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2018-12-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember 2019-01-01 2019-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2019-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2019-01-01 2019-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2019-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2019-01-01 2019-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2019-12-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:InterestRateMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2020-01-01 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2020-01-01 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2020-03-31 0000004904 aep:AppalachianPowerCoMember aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2019-01-01 2019-03-31 0000004904 aep:AppalachianPowerCoMember us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2019-01-01 2019-03-31 0000004904 aep:AppalachianPowerCoMember us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2018-12-31 0000004904 aep:AppalachianPowerCoMember aep:InterestRateMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2019-01-01 2019-03-31 0000004904 aep:AppalachianPowerCoMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2019-01-01 2019-03-31 0000004904 aep:AppalachianPowerCoMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember 2019-01-01 2019-03-31 0000004904 aep:AppalachianPowerCoMember us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2019-03-31 0000004904 aep:AppalachianPowerCoMember aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2018-12-31 0000004904 aep:AppalachianPowerCoMember aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2019-03-31 0000004904 aep:OhioPowerCoMember aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2019-01-01 2019-03-31 0000004904 aep:OhioPowerCoMember aep:InterestRateMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2019-01-01 2019-03-31 0000004904 aep:OhioPowerCoMember aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2019-03-31 0000004904 aep:OhioPowerCoMember aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2018-12-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember 2020-01-01 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:InterestRateMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2020-01-01 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2020-01-01 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2020-01-01 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2020-01-01 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2019-12-31 0000004904 aep:IndianaMichiganPowerCoMember aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2019-12-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2020-03-31 0000004904 aep:OhioPowerCoMember aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2019-12-31 0000004904 aep:OhioPowerCoMember aep:InterestRateMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2020-01-01 2020-03-31 0000004904 aep:OhioPowerCoMember aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2020-01-01 2020-03-31 0000004904 aep:OhioPowerCoMember aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2020-01-01 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2019-12-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2020-01-01 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:InterestRateMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2020-01-01 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2020-01-01 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember 2020-01-01 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2019-12-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2020-03-31 0000004904 aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2019-01-01 2019-03-31 0000004904 us-gaap:ElectricityPurchasedMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember 2019-01-01 2019-03-31 0000004904 us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember 2019-01-01 2019-03-31 0000004904 us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2018-12-31 0000004904 us-gaap:CommodityContractMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2019-03-31 0000004904 us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2019-01-01 2019-03-31 0000004904 us-gaap:ElectricityPurchasedMember us-gaap:CommodityContractMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2019-01-01 2019-03-31 0000004904 us-gaap:CommodityContractMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2019-01-01 2019-03-31 0000004904 aep:InterestRateMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2019-01-01 2019-03-31 0000004904 us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2019-03-31 0000004904 aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2018-12-31 0000004904 us-gaap:CommodityContractMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2019-01-01 2019-03-31 0000004904 us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2019-01-01 2019-03-31 0000004904 us-gaap:CommodityContractMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2018-12-31 0000004904 us-gaap:ElectricityPurchasedMember aep:InterestRateMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2019-01-01 2019-03-31 0000004904 aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2019-03-31 0000004904 us-gaap:ElectricityPurchasedMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2019-01-01 2019-03-31 0000004904 aep:AEPTexasInc.Member us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2019-01-01 2019-03-31 0000004904 aep:AEPTexasInc.Member us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2019-01-01 2019-03-31 0000004904 aep:AEPTexasInc.Member aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2018-12-31 0000004904 aep:AEPTexasInc.Member aep:InterestRateMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2019-01-01 2019-03-31 0000004904 aep:AEPTexasInc.Member us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2018-12-31 0000004904 aep:AEPTexasInc.Member aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2019-03-31 0000004904 aep:AEPTexasInc.Member aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2019-01-01 2019-03-31 0000004904 aep:AEPTexasInc.Member us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember 2019-01-01 2019-03-31 0000004904 aep:AEPTexasInc.Member us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2019-03-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:InterestRateMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2019-01-01 2019-03-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember 2019-01-01 2019-03-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2018-12-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2019-01-01 2019-03-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2018-12-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2019-01-01 2019-03-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2019-01-01 2019-03-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:AccumulatedDefinedBenefitPlansAdjustmentMember 2019-03-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:InterestRateMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2019-03-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:PublicServiceCoOfOklahomaMember 2019-12-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyEarningReturnMember aep:PublicServiceCoOfOklahomaMember aep:OklaunionPowerStationAcceleratedDepreciationMember 2020-03-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyNotEarningReturnMember aep:PublicServiceCoOfOklahomaMember us-gaap:StormCostsMember 2019-12-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyNotEarningReturnMember aep:PublicServiceCoOfOklahomaMember us-gaap:StormCostsMember 2020-03-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyEarningReturnMember aep:PublicServiceCoOfOklahomaMember aep:OklaunionPowerStationAcceleratedDepreciationMember 2019-12-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:PublicServiceCoOfOklahomaMember 2020-03-31 0000004904 aep:A2019TexasBaseRateCaseMember aep:AEPTexasInc.Member 2020-01-01 2020-03-31 0000004904 aep:ETTInterimTransmissionRatesMember 2020-01-01 2020-03-31 0000004904 aep:A2012TexasBaseRateCaseMember aep:SouthwesternElectricPowerCoMember 2020-01-01 2020-03-31 0000004904 aep:A2019IndianaBaseRateCaseMember aep:IndianaMichiganPowerCoMember 2020-01-01 2020-03-31 0000004904 aep:A2019TexasBaseRateCaseMember aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyNotEarningReturnMember aep:AEPTexasInc.Member aep:VegetationManagementMember 2020-03-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:VirginiaJurisdictionalAMRMetersMember 2020-03-31 0000004904 aep:VirginiaLegislationAffectingBiennialReviewsMember aep:AppalachianPowerCoMember 2020-01-01 2020-03-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:VirginiaJurisdictionalAMRMetersMember 2019-12-31 0000004904 aep:A2016TexasBaseRateCaseMember aep:SouthwesternElectricPowerCoMember 2020-01-01 2020-03-31 0000004904 aep:Louisiana2018FormulaRateFilingMember aep:SouthwesternElectricPowerCoMember 2020-01-01 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:GeneratingUnitsProbableofAbandonmentMember aep:DoletHillsGeneratingStationUnitNo1Member 2020-03-31 0000004904 aep:A2019TexasBaseRateCaseMember aep:CapitalInvestmentsMember aep:AEPTexasInc.Member us-gaap:SubsequentEventMember 2020-04-01 2020-05-06 0000004904 aep:A2019TexasBaseRateCaseMember aep:AEPTexasInc.Member us-gaap:SubsequentEventMember 2020-04-01 2020-05-06 0000004904 aep:VirginiaLegislationAffectingBiennialReviewsMember aep:AppalachianPowerCoMember aep:PlantRetirementCostsUnrecoveredPlantMember 2020-01-01 2020-03-31 0000004904 aep:VirginiaLegislationAffectingBiennialReviewsMember aep:AppalachianPowerCoMember aep:VirginiaJurisdictionalAMRMetersMember 2020-03-31 0000004904 aep:A2019TexasBaseRateCaseMember aep:RateCaseExpenseMember aep:AEPTexasInc.Member us-gaap:SubsequentEventMember 2020-04-01 2020-05-06 0000004904 aep:A2019TexasBaseRateCaseMember aep:ExcessADITandExcessFederalIncomeTaxestoTransmissionCustomersMember aep:AEPTexasInc.Member us-gaap:SubsequentEventMember 2020-04-01 2020-05-06 0000004904 aep:A2019TexasBaseRateCaseMember aep:ExcessADITandExcessFederalIncomeTaxestoDistributionCustomersMember aep:AEPTexasInc.Member us-gaap:SubsequentEventMember 2020-04-01 2020-05-06 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:AppalachianPowerCoMember aep:VirginiaJurisdictionalAMRMetersMember 2020-03-31 0000004904 aep:A2019TexasBaseRateCaseMember aep:RateCaseExpenseMember aep:AEPTexasInc.Member 2020-01-01 2020-03-31 0000004904 aep:A2019TexasBaseRateCaseMember aep:PreviouslyCollectedRatesSubjecttoReconciliationMember aep:AEPTexasInc.Member 2020-01-01 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:GeneratingUnitsProbableofAbandonmentMember aep:DoletHillsGeneratingStationUnitNo1Member 2020-01-01 2020-03-31 0000004904 aep:VirginiaLegislationAffectingBiennialReviewsMember aep:AppalachianPowerCoMember aep:PlantRetirementCostsUnrecoveredPlantMember 2020-03-31 0000004904 aep:A2019TexasBaseRateCaseMember aep:Amountof2019InvestmentsMember aep:AEPTexasInc.Member 2020-01-01 2020-03-31 0000004904 aep:VirginiaLegislationAffectingBiennialReviewsMember aep:AppalachianPowerCoMember aep:VirginiaJurisdictionalAMRMetersMember 2019-12-31 0000004904 aep:A2019TexasBaseRateCaseMember aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyNotEarningReturnMember aep:VegetationManagementMember 2020-03-31 0000004904 aep:A2012TexasBaseRateCaseMember aep:SouthwesternElectricPowerCoMember aep:TurkGeneratingPlantMember 2020-01-01 2020-03-31 0000004904 aep:A2019TexasBaseRateCaseMember aep:PreviouslyCollectedRatesSubjecttoReconciliationMember aep:AEPTexasInc.Member us-gaap:SubsequentEventMember 2020-04-01 2020-05-06 0000004904 aep:VegetationManagementMember aep:A2019TexasBaseRateCaseMember aep:AEPTexasInc.Member us-gaap:SubsequentEventMember 2020-04-01 2020-05-06 0000004904 aep:A2012TexasBaseRateCaseMember aep:SouthwesternElectricPowerCoMember aep:TurkGeneratingPlantMember 2020-03-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:AppalachianPowerCoMember aep:VirginiaJurisdictionalAMRMetersMember 2019-12-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyEarningReturnMember aep:SouthwesternElectricPowerCoMember aep:OtherRegulatoryAssetsNotYetBeingRecoveredMember 2020-03-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyEarningReturnMember aep:SouthwesternElectricPowerCoMember aep:DoletHillsPowerStationAcceleratedDepreciationMember 2020-03-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:SouthwesternElectricPowerCoMember 2019-12-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyNotEarningReturnMember aep:SouthwesternElectricPowerCoMember aep:OtherRegulatoryAssetsNotYetBeingRecoveredMember 2019-12-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyEarningReturnMember aep:SouthwesternElectricPowerCoMember aep:PlantRetirementCostsUnrecoveredPlantLouisianaMember 2020-03-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyEarningReturnMember aep:SouthwesternElectricPowerCoMember aep:DoletHillsPowerStationAcceleratedDepreciationMember 2019-12-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyNotEarningReturnMember aep:SouthwesternElectricPowerCoMember aep:OtherRegulatoryAssetsNotYetBeingRecoveredMember 2020-03-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:SouthwesternElectricPowerCoMember 2020-03-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyNotEarningReturnMember aep:SouthwesternElectricPowerCoMember aep:AssetRetirementObligationLouisianaMember 2019-12-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyNotEarningReturnMember aep:SouthwesternElectricPowerCoMember aep:AssetRetirementObligationLouisianaMember 2020-03-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyEarningReturnMember aep:SouthwesternElectricPowerCoMember aep:PlantRetirementCostsUnrecoveredPlantLouisianaMember 2019-12-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyEarningReturnMember aep:SouthwesternElectricPowerCoMember aep:OtherRegulatoryAssetsNotYetBeingRecoveredMember 2019-12-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyNotEarningReturnMember aep:AppalachianPowerCoMember aep:AssetRetirementObligationRelatedtoRetiredPlantsMember 2020-03-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyEarningReturnMember aep:AppalachianPowerCoMember aep:MaterialsandSuppliesRelatedtoRetiredPlantsMember 2020-03-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:AppalachianPowerCoMember 2020-03-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyNotEarningReturnMember aep:AppalachianPowerCoMember aep:AssetRetirementObligationRelatedtoRetiredPlantsMember 2019-12-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyEarningReturnMember aep:AppalachianPowerCoMember aep:MaterialsandSuppliesRelatedtoRetiredPlantsMember 2019-12-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:AppalachianPowerCoMember 2019-12-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:GeneratingUnitsProbableofAbandonmentMember aep:OklaunionGeneratingStationUnitNo1Member 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:GeneratingUnitsProbableofAbandonmentMember aep:OklaunionGeneratingStationUnitNo1Member 2020-01-01 2020-03-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyNotEarningReturnMember aep:OhioPowerCoMember aep:OtherRegulatoryAssetsNotYetBeingRecoveredMember 2020-03-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:OhioPowerCoMember 2019-12-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:OhioPowerCoMember 2020-03-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyNotEarningReturnMember aep:OhioPowerCoMember aep:OtherRegulatoryAssetsNotYetBeingRecoveredMember 2019-12-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyNotEarningReturnMember aep:AEPTexasInc.Member aep:OtherRegulatoryAssetsNotYetBeingRecoveredMember 2020-03-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyNotEarningReturnMember aep:AEPTexasInc.Member aep:VegetationManagementMember 2020-03-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:AEPTexasInc.Member 2019-12-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:AEPTexasInc.Member 2020-03-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyNotEarningReturnMember aep:AEPTexasInc.Member aep:OtherRegulatoryAssetsNotYetBeingRecoveredMember 2019-12-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyNotEarningReturnMember aep:AEPTexasInc.Member aep:VegetationManagementMember 2019-12-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyNotEarningReturnMember aep:IndianaMichiganPowerCoMember aep:OtherRegulatoryAssetsNotYetBeingRecoveredMember 2019-12-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:IndianaMichiganPowerCoMember 2020-03-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyNotEarningReturnMember aep:IndianaMichiganPowerCoMember aep:CookPlantStudyCostsMember 2019-12-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyNotEarningReturnMember aep:IndianaMichiganPowerCoMember aep:OtherRegulatoryAssetsNotYetBeingRecoveredMember 2020-03-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:IndianaMichiganPowerCoMember 2019-12-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyNotEarningReturnMember aep:IndianaMichiganPowerCoMember aep:CookPlantStudyCostsMember 2020-03-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyNotEarningReturnMember us-gaap:StormCostsMember 2020-03-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember 2019-12-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyNotEarningReturnMember aep:CookPlantStudyCostsMember 2019-12-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyNotEarningReturnMember aep:OtherRegulatoryAssetsNotYetBeingRecoveredMember 2020-03-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyEarningReturnMember aep:OtherRegulatoryAssetsNotYetBeingRecoveredMember 2019-12-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyNotEarningReturnMember aep:OtherRegulatoryAssetsNotYetBeingRecoveredMember 2019-12-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyNotEarningReturnMember aep:AssetRetirementObligationRelatedtoRetiredPlantsMember 2020-03-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyNotEarningReturnMember aep:VegetationManagementMember 2020-03-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyNotEarningReturnMember aep:VegetationManagementMember 2019-12-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyEarningReturnMember aep:KentuckyDeferredPurchasePowerExpensesMember 2019-12-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyEarningReturnMember aep:DoletHillsPowerStationAcceleratedDepreciationMember 2020-03-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyEarningReturnMember aep:OklaunionPowerStationAcceleratedDepreciationMember 2019-12-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyEarningReturnMember aep:PlantRetirementCostsUnrecoveredPlantMember 2019-12-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyEarningReturnMember aep:OtherRegulatoryAssetsNotYetBeingRecoveredMember 2020-03-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyNotEarningReturnMember aep:AssetRetirementObligationMember 2019-12-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyNotEarningReturnMember aep:CookPlantStudyCostsMember 2020-03-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyEarningReturnMember aep:PlantRetirementCostsUnrecoveredPlantMember 2020-03-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyEarningReturnMember aep:OklaunionPowerStationAcceleratedDepreciationMember 2020-03-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyEarningReturnMember aep:DoletHillsPowerStationAcceleratedDepreciationMember 2019-12-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyEarningReturnMember aep:KentuckyDeferredPurchasePowerExpensesMember 2020-03-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyNotEarningReturnMember us-gaap:StormCostsMember 2019-12-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyNotEarningReturnMember aep:AssetRetirementObligationMember 2020-03-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember 2020-03-31 0000004904 aep:RegulatoryAssetsPendingFinalRegulatoryApprovalMember aep:RegulatoryAssetsCurrentlyNotEarningReturnMember aep:AssetRetirementObligationRelatedtoRetiredPlantsMember 2019-12-31 0000004904 aep:LettersOfCreditMember 2020-03-31 0000004904 2019-07-01 2019-07-25 0000004904 aep:BoatandBargeLeasesMember 2020-03-31 0000004904 aep:June2022Member aep:LettersOfCreditMember 2020-03-31 0000004904 aep:RockportLeaseMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:RockportLeaseMember 2020-03-31 0000004904 aep:OhioPowerCoMember aep:LettersOfCreditMember 2020-03-31 0000004904 aep:AEPTexasInc.Member aep:LettersOfCreditMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember 2019-07-01 2019-07-25 0000004904 aep:AEPWindHoldingsLLCMember aep:GenerationAndMarketingMember 2020-03-31 0000004904 aep:AEPWindHoldingsLLCMember aep:GenerationAndMarketingMember 2020-01-01 2020-03-31 0000004904 aep:AEPWindHoldingsLLCMember us-gaap:EquityMethodInvestmentsMember aep:GenerationAndMarketingMember 2020-01-01 2020-03-31 0000004904 aep:AEPWindHoldingsLLCMember us-gaap:NoncontrollingInterestMember aep:GenerationAndMarketingMember 2020-01-01 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember us-gaap:PensionPlansDefinedBenefitMember 2020-01-01 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2020-01-01 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember us-gaap:PensionPlansDefinedBenefitMember 2019-01-01 2019-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2019-01-01 2019-03-31 0000004904 aep:OhioPowerCoMember us-gaap:PensionPlansDefinedBenefitMember 2020-01-01 2020-03-31 0000004904 aep:OhioPowerCoMember us-gaap:PensionPlansDefinedBenefitMember 2019-01-01 2019-03-31 0000004904 aep:OhioPowerCoMember us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2020-01-01 2020-03-31 0000004904 aep:OhioPowerCoMember us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2019-01-01 2019-03-31 0000004904 us-gaap:PensionPlansDefinedBenefitMember 2019-01-01 2019-03-31 0000004904 us-gaap:PensionPlansDefinedBenefitMember 2020-01-01 2020-03-31 0000004904 us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2019-01-01 2019-03-31 0000004904 us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2020-01-01 2020-03-31 0000004904 aep:AppalachianPowerCoMember us-gaap:PensionPlansDefinedBenefitMember 2019-01-01 2019-03-31 0000004904 aep:AppalachianPowerCoMember us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2019-01-01 2019-03-31 0000004904 aep:AppalachianPowerCoMember us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2020-01-01 2020-03-31 0000004904 aep:AppalachianPowerCoMember us-gaap:PensionPlansDefinedBenefitMember 2020-01-01 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2020-01-01 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2019-01-01 2019-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:PensionPlansDefinedBenefitMember 2020-01-01 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:PensionPlansDefinedBenefitMember 2019-01-01 2019-03-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:PensionPlansDefinedBenefitMember 2020-01-01 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:PensionPlansDefinedBenefitMember 2019-01-01 2019-03-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2020-01-01 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2019-01-01 2019-03-31 0000004904 aep:AEPTexasInc.Member us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2020-01-01 2020-03-31 0000004904 aep:AEPTexasInc.Member us-gaap:PensionPlansDefinedBenefitMember 2020-01-01 2020-03-31 0000004904 aep:AEPTexasInc.Member us-gaap:PensionPlansDefinedBenefitMember 2019-01-01 2019-03-31 0000004904 aep:AEPTexasInc.Member us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2019-01-01 2019-03-31 0000004904 aep:TransmissionOperationsMember 2020-03-31 0000004904 us-gaap:AllOtherSegmentsMember 2020-03-31 0000004904 srt:ConsolidationEliminationsMember 2020-03-31 0000004904 aep:GenerationAndMarketingMember 2020-03-31 0000004904 aep:VerticallyIntegratedUtilitiesMember 2020-03-31 0000004904 aep:TransmissionAndDistributionCompaniesMember 2020-03-31 0000004904 us-gaap:ElectricityMember aep:VerticallyIntegratedUtilitiesMember 2020-01-01 2020-03-31 0000004904 aep:GenerationAndMarketingMember 2019-01-01 2019-03-31 0000004904 aep:GenerationAndMarketingMember 2020-01-01 2020-03-31 0000004904 srt:ConsolidationEliminationsMember 2019-01-01 2019-03-31 0000004904 aep:TransmissionandDistributionUtilitiesRevenuesMember aep:TransmissionAndDistributionCompaniesMember 2020-01-01 2020-03-31 0000004904 aep:GenerationAndMarketingRevenuesMember aep:GenerationAndMarketingMember 2020-01-01 2020-03-31 0000004904 aep:GenerationAndMarketingRevenuesMember aep:GenerationAndMarketingMember 2019-01-01 2019-03-31 0000004904 aep:VerticallyIntegratedUtilitiesMember 2019-01-01 2019-03-31 0000004904 us-gaap:ElectricTransmissionMember aep:TransmissionOperationsMember 2019-01-01 2019-03-31 0000004904 aep:TransmissionOperationsMember 2019-01-01 2019-03-31 0000004904 us-gaap:AllOtherSegmentsMember 2020-01-01 2020-03-31 0000004904 aep:TransmissionAndDistributionCompaniesMember 2019-01-01 2019-03-31 0000004904 aep:TransmissionAndDistributionCompaniesMember 2020-01-01 2020-03-31 0000004904 aep:OtherRevenuesMember us-gaap:AllOtherSegmentsMember 2020-01-01 2020-03-31 0000004904 aep:TransmissionOperationsMember 2020-01-01 2020-03-31 0000004904 aep:VerticallyIntegratedUtilitiesMember 2020-01-01 2020-03-31 0000004904 us-gaap:ElectricityMember aep:VerticallyIntegratedUtilitiesMember 2019-01-01 2019-03-31 0000004904 us-gaap:ElectricTransmissionMember aep:TransmissionOperationsMember 2020-01-01 2020-03-31 0000004904 us-gaap:AllOtherSegmentsMember 2019-01-01 2019-03-31 0000004904 aep:OtherRevenuesMember us-gaap:AllOtherSegmentsMember 2019-01-01 2019-03-31 0000004904 srt:ConsolidationEliminationsMember 2020-01-01 2020-03-31 0000004904 aep:TransmissionandDistributionUtilitiesRevenuesMember aep:TransmissionAndDistributionCompaniesMember 2019-01-01 2019-03-31 0000004904 aep:AEPTransmissionCoMember aep:AEPTCoParentMember 2020-03-31 0000004904 aep:AEPTransmissionCoMember aep:StateTranscosMember 2019-12-31 0000004904 aep:AEPTransmissionCoMember srt:ConsolidationEliminationsMember 2020-03-31 0000004904 aep:AEPTransmissionCoMember aep:AEPTCoParentMember 2019-12-31 0000004904 aep:AEPTransmissionCoMember srt:ConsolidationEliminationsMember 2019-12-31 0000004904 aep:AEPTransmissionCoMember aep:StateTranscosMember 2020-03-31 0000004904 aep:AEPTransmissionCoMember aep:StateTranscosMember 2019-01-01 2019-03-31 0000004904 aep:AEPTransmissionCoMember aep:AEPTCoParentMember 2020-01-01 2020-03-31 0000004904 aep:AEPTransmissionCoMember srt:ConsolidationEliminationsMember 2020-01-01 2020-03-31 0000004904 aep:AEPTransmissionCoMember aep:AEPTCoParentMember 2019-01-01 2019-03-31 0000004904 aep:AEPTransmissionCoMember srt:ConsolidationEliminationsMember 2019-01-01 2019-03-31 0000004904 aep:AEPTransmissionCoMember us-gaap:ElectricTransmissionMember aep:StateTranscosMember 2019-01-01 2019-03-31 0000004904 aep:AEPTransmissionCoMember aep:StateTranscosMember 2020-01-01 2020-03-31 0000004904 aep:AEPTransmissionCoMember aep:OtherRevenuesMember aep:StateTranscosMember 2020-01-01 2020-03-31 0000004904 aep:AEPTransmissionCoMember us-gaap:ElectricTransmissionMember aep:StateTranscosMember 2020-01-01 2020-03-31 0000004904 aep:AEPTransmissionCoMember srt:ConsolidationEliminationsMember aep:OtherRevenuesMember 2020-01-01 2020-03-31 0000004904 aep:AEPTransmissionCoMember us-gaap:ElectricTransmissionMember aep:AEPTCoParentMember 2020-01-01 2020-03-31 0000004904 aep:VerticallyIntegratedUtilitiesMember 2019-12-31 0000004904 aep:GenerationAndMarketingMember 2019-12-31 0000004904 srt:ConsolidationEliminationsMember 2019-12-31 0000004904 us-gaap:AllOtherSegmentsMember 2019-12-31 0000004904 aep:TransmissionAndDistributionCompaniesMember 2019-12-31 0000004904 aep:TransmissionOperationsMember 2019-12-31 0000004904 aep:AEPTexasInc.Member aep:GenerationAndMarketingRevenuesMember 2019-01-01 2019-03-31 0000004904 aep:OhioPowerCoMember aep:VerticallyIntegratedUtilitiesRevenuesMember 2019-01-01 2019-03-31 0000004904 aep:AppalachianPowerCoMember aep:RegulatoryLiabilitiesMember 2019-01-01 2019-03-31 0000004904 aep:GenerationAndMarketingRevenuesMember 2019-01-01 2019-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:RegulatoryLiabilitiesMember 2019-01-01 2019-03-31 0000004904 aep:AppalachianPowerCoMember aep:RegulatoryAssetsMember 2019-01-01 2019-03-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:PurchasedElectricityForResaleMember 2019-01-01 2019-03-31 0000004904 aep:AEPTexasInc.Member aep:OtherOperationExpenseMember 2019-01-01 2019-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:RegulatoryLiabilitiesMember 2019-01-01 2019-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:ElectricGenerationTransmissionDistributionRevenuesMember 2019-01-01 2019-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:MaintenanceExpenseMember 2019-01-01 2019-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:VerticallyIntegratedUtilitiesRevenuesMember 2019-01-01 2019-03-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:VerticallyIntegratedUtilitiesRevenuesMember 2019-01-01 2019-03-31 0000004904 aep:OhioPowerCoMember aep:ElectricGenerationTransmissionDistributionRevenuesMember 2019-01-01 2019-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:OtherOperationExpenseMember 2019-01-01 2019-03-31 0000004904 aep:OhioPowerCoMember aep:OtherOperationExpenseMember 2019-01-01 2019-03-31 0000004904 aep:AEPTexasInc.Member aep:RegulatoryAssetsMember 2019-01-01 2019-03-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:RegulatoryLiabilitiesMember 2019-01-01 2019-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:OtherOperationExpenseMember 2019-01-01 2019-03-31 0000004904 aep:AEPTexasInc.Member aep:MaintenanceExpenseMember 2019-01-01 2019-03-31 0000004904 aep:AppalachianPowerCoMember aep:PurchasedElectricityForResaleMember 2019-01-01 2019-03-31 0000004904 aep:OtherOperationExpenseMember 2019-01-01 2019-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:RegulatoryAssetsMember 2019-01-01 2019-03-31 0000004904 aep:RegulatoryAssetsMember 2019-01-01 2019-03-31 0000004904 aep:AppalachianPowerCoMember aep:VerticallyIntegratedUtilitiesRevenuesMember 2019-01-01 2019-03-31 0000004904 aep:OhioPowerCoMember aep:MaintenanceExpenseMember 2019-01-01 2019-03-31 0000004904 aep:AEPTexasInc.Member aep:RegulatoryLiabilitiesMember 2019-01-01 2019-03-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:GenerationAndMarketingRevenuesMember 2019-01-01 2019-03-31 0000004904 aep:VerticallyIntegratedUtilitiesRevenuesMember 2019-01-01 2019-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:ElectricGenerationTransmissionDistributionRevenuesMember 2019-01-01 2019-03-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:RegulatoryAssetsMember 2019-01-01 2019-03-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:OtherOperationExpenseMember 2019-01-01 2019-03-31 0000004904 aep:OhioPowerCoMember aep:PurchasedElectricityForResaleMember 2019-01-01 2019-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:GenerationAndMarketingRevenuesMember 2019-01-01 2019-03-31 0000004904 aep:OhioPowerCoMember aep:RegulatoryLiabilitiesMember 2019-01-01 2019-03-31 0000004904 aep:AppalachianPowerCoMember aep:ElectricGenerationTransmissionDistributionRevenuesMember 2019-01-01 2019-03-31 0000004904 aep:ElectricGenerationTransmissionDistributionRevenuesMember 2019-01-01 2019-03-31 0000004904 aep:RegulatoryLiabilitiesMember 2019-01-01 2019-03-31 0000004904 aep:PurchasedElectricityForResaleMember 2019-01-01 2019-03-31 0000004904 aep:AppalachianPowerCoMember aep:GenerationAndMarketingRevenuesMember 2019-01-01 2019-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:RegulatoryAssetsMember 2019-01-01 2019-03-31 0000004904 aep:AEPTexasInc.Member aep:PurchasedElectricityForResaleMember 2019-01-01 2019-03-31 0000004904 aep:AEPTexasInc.Member aep:ElectricGenerationTransmissionDistributionRevenuesMember 2019-01-01 2019-03-31 0000004904 aep:AppalachianPowerCoMember aep:OtherOperationExpenseMember 2019-01-01 2019-03-31 0000004904 aep:OhioPowerCoMember aep:RegulatoryAssetsMember 2019-01-01 2019-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:MaintenanceExpenseMember 2019-01-01 2019-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:PurchasedElectricityForResaleMember 2019-01-01 2019-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:PurchasedElectricityForResaleMember 2019-01-01 2019-03-31 0000004904 aep:MaintenanceExpenseMember 2019-01-01 2019-03-31 0000004904 aep:AEPTexasInc.Member aep:VerticallyIntegratedUtilitiesRevenuesMember 2019-01-01 2019-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:GenerationAndMarketingRevenuesMember 2019-01-01 2019-03-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:ElectricGenerationTransmissionDistributionRevenuesMember 2019-01-01 2019-03-31 0000004904 aep:AppalachianPowerCoMember aep:MaintenanceExpenseMember 2019-01-01 2019-03-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:MaintenanceExpenseMember 2019-01-01 2019-03-31 0000004904 aep:OhioPowerCoMember aep:GenerationAndMarketingRevenuesMember 2019-01-01 2019-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:VerticallyIntegratedUtilitiesRevenuesMember 2019-01-01 2019-03-31 0000004904 aep:AppalachianPowerCoMember aep:ElectricGenerationTransmissionDistributionRevenuesMember 2020-01-01 2020-03-31 0000004904 aep:RegulatoryLiabilitiesMember 2020-01-01 2020-03-31 0000004904 aep:AEPTexasInc.Member aep:RegulatoryAssetsMember 2020-01-01 2020-03-31 0000004904 aep:OhioPowerCoMember aep:PurchasedElectricityForResaleMember 2020-01-01 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:MaintenanceExpenseMember 2020-01-01 2020-03-31 0000004904 aep:OhioPowerCoMember aep:VerticallyIntegratedUtilitiesRevenuesMember 2020-01-01 2020-03-31 0000004904 aep:OhioPowerCoMember aep:MaintenanceExpenseMember 2020-01-01 2020-03-31 0000004904 aep:OhioPowerCoMember aep:RegulatoryAssetsMember 2020-01-01 2020-03-31 0000004904 aep:PurchasedElectricityForResaleMember 2020-01-01 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:OtherOperationExpenseMember 2020-01-01 2020-03-31 0000004904 aep:ElectricGenerationTransmissionDistributionRevenuesMember 2020-01-01 2020-03-31 0000004904 aep:AEPTexasInc.Member aep:PurchasedElectricityForResaleMember 2020-01-01 2020-03-31 0000004904 aep:AppalachianPowerCoMember aep:RegulatoryAssetsMember 2020-01-01 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:GenerationAndMarketingRevenuesMember 2020-01-01 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:ElectricGenerationTransmissionDistributionRevenuesMember 2020-01-01 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:GenerationAndMarketingRevenuesMember 2020-01-01 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:RegulatoryLiabilitiesMember 2020-01-01 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:ElectricGenerationTransmissionDistributionRevenuesMember 2020-01-01 2020-03-31 0000004904 aep:AEPTexasInc.Member aep:OtherOperationExpenseMember 2020-01-01 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:RegulatoryLiabilitiesMember 2020-01-01 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:RegulatoryAssetsMember 2020-01-01 2020-03-31 0000004904 aep:AEPTexasInc.Member aep:RegulatoryLiabilitiesMember 2020-01-01 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:PurchasedElectricityForResaleMember 2020-01-01 2020-03-31 0000004904 aep:AppalachianPowerCoMember aep:PurchasedElectricityForResaleMember 2020-01-01 2020-03-31 0000004904 aep:AEPTexasInc.Member aep:MaintenanceExpenseMember 2020-01-01 2020-03-31 0000004904 aep:AppalachianPowerCoMember aep:GenerationAndMarketingRevenuesMember 2020-01-01 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:VerticallyIntegratedUtilitiesRevenuesMember 2020-01-01 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:RegulatoryAssetsMember 2020-01-01 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:OtherOperationExpenseMember 2020-01-01 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:RegulatoryLiabilitiesMember 2020-01-01 2020-03-31 0000004904 aep:MaintenanceExpenseMember 2020-01-01 2020-03-31 0000004904 aep:AppalachianPowerCoMember aep:RegulatoryLiabilitiesMember 2020-01-01 2020-03-31 0000004904 aep:AEPTexasInc.Member aep:GenerationAndMarketingRevenuesMember 2020-01-01 2020-03-31 0000004904 aep:RegulatoryAssetsMember 2020-01-01 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:ElectricGenerationTransmissionDistributionRevenuesMember 2020-01-01 2020-03-31 0000004904 aep:OhioPowerCoMember aep:RegulatoryLiabilitiesMember 2020-01-01 2020-03-31 0000004904 aep:OhioPowerCoMember aep:ElectricGenerationTransmissionDistributionRevenuesMember 2020-01-01 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:MaintenanceExpenseMember 2020-01-01 2020-03-31 0000004904 aep:OhioPowerCoMember aep:OtherOperationExpenseMember 2020-01-01 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:PurchasedElectricityForResaleMember 2020-01-01 2020-03-31 0000004904 aep:GenerationAndMarketingRevenuesMember 2020-01-01 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:MaintenanceExpenseMember 2020-01-01 2020-03-31 0000004904 aep:AppalachianPowerCoMember aep:MaintenanceExpenseMember 2020-01-01 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:GenerationAndMarketingRevenuesMember 2020-01-01 2020-03-31 0000004904 aep:AppalachianPowerCoMember aep:OtherOperationExpenseMember 2020-01-01 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:VerticallyIntegratedUtilitiesRevenuesMember 2020-01-01 2020-03-31 0000004904 aep:VerticallyIntegratedUtilitiesRevenuesMember 2020-01-01 2020-03-31 0000004904 aep:AEPTexasInc.Member aep:VerticallyIntegratedUtilitiesRevenuesMember 2020-01-01 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:PurchasedElectricityForResaleMember 2020-01-01 2020-03-31 0000004904 aep:OhioPowerCoMember aep:GenerationAndMarketingRevenuesMember 2020-01-01 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:VerticallyIntegratedUtilitiesRevenuesMember 2020-01-01 2020-03-31 0000004904 aep:AEPTexasInc.Member aep:ElectricGenerationTransmissionDistributionRevenuesMember 2020-01-01 2020-03-31 0000004904 aep:OtherOperationExpenseMember 2020-01-01 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:OtherOperationExpenseMember 2020-01-01 2020-03-31 0000004904 aep:AppalachianPowerCoMember aep:VerticallyIntegratedUtilitiesRevenuesMember 2020-01-01 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:RegulatoryAssetsMember 2020-01-01 2020-03-31 0000004904 aep:OhioPowerCoMember aep:NetAmountsOfAssetsLiabilitiesPresentedInStatementOfFinancialPositionMember 2020-03-31 0000004904 aep:OhioPowerCoMember aep:GrossAmountsOffsetInStatementOfFinancialPositionMember 2020-03-31 0000004904 aep:OhioPowerCoMember us-gaap:CommodityContractMember aep:RiskManagementCommodityContractsMember 2020-03-31 0000004904 aep:HeatingOilAndGasolineContractMember 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember us-gaap:InterestRateContractMember 2020-03-31 0000004904 aep:AEPTexasInc.Member aep:NaturalGasContractMember 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:InterestRateMember 2020-03-31 0000004904 aep:PowerContractMember 2020-03-31 0000004904 aep:AEPTexasInc.Member aep:InterestRateMember 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:HeatingOilAndGasolineContractMember 2020-03-31 0000004904 aep:OhioPowerCoMember aep:NaturalGasContractMember 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:NaturalGasContractMember 2020-03-31 0000004904 aep:AEPTexasInc.Member us-gaap:InterestRateContractMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:HeatingOilAndGasolineContractMember 2020-03-31 0000004904 aep:AEPTexasInc.Member aep:PowerContractMember 2020-03-31 0000004904 aep:AppalachianPowerCoMember aep:HeatingOilAndGasolineContractMember 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:InterestRateContractMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:PowerContractMember 2020-03-31 0000004904 aep:AppalachianPowerCoMember us-gaap:InterestRateContractMember 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:PowerContractMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:InterestRateMember 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:HeatingOilAndGasolineContractMember 2020-03-31 0000004904 aep:AppalachianPowerCoMember aep:InterestRateMember 2020-03-31 0000004904 aep:OhioPowerCoMember us-gaap:InterestRateContractMember 2020-03-31 0000004904 aep:OhioPowerCoMember aep:PowerContractMember 2020-03-31 0000004904 aep:OhioPowerCoMember aep:HeatingOilAndGasolineContractMember 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:InterestRateMember 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:NaturalGasContractMember 2020-03-31 0000004904 aep:NaturalGasContractMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:InterestRateContractMember 2020-03-31 0000004904 aep:AppalachianPowerCoMember aep:NaturalGasContractMember 2020-03-31 0000004904 aep:InterestRateMember 2020-03-31 0000004904 aep:OhioPowerCoMember aep:InterestRateMember 2020-03-31 0000004904 us-gaap:InterestRateContractMember 2020-03-31 0000004904 aep:AppalachianPowerCoMember aep:PowerContractMember 2020-03-31 0000004904 aep:AEPTexasInc.Member aep:HeatingOilAndGasolineContractMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:NaturalGasContractMember 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:PowerContractMember 2020-03-31 0000004904 aep:AEPTexasInc.Member aep:GrossAmountsOffsetInStatementOfFinancialPositionMember 2019-12-31 0000004904 aep:AEPTexasInc.Member us-gaap:CommodityContractMember aep:RiskManagementCommodityContractsMember 2019-12-31 0000004904 aep:AEPTexasInc.Member aep:NetAmountsOfAssetsLiabilitiesPresentedInStatementOfFinancialPositionMember 2019-12-31 0000004904 aep:OhioPowerCoMember aep:NetAmountsOfAssetsLiabilitiesPresentedInStatementOfFinancialPositionMember 2019-12-31 0000004904 aep:OhioPowerCoMember us-gaap:CommodityContractMember aep:RiskManagementCommodityContractsMember 2019-12-31 0000004904 aep:OhioPowerCoMember aep:GrossAmountsOffsetInStatementOfFinancialPositionMember 2019-12-31 0000004904 aep:AEPTexasInc.Member aep:NetAmountsOfAssetsLiabilitiesPresentedInStatementOfFinancialPositionMember 2020-03-31 0000004904 aep:AEPTexasInc.Member aep:GrossAmountsOffsetInStatementOfFinancialPositionMember 2020-03-31 0000004904 aep:AEPTexasInc.Member us-gaap:CommodityContractMember aep:RiskManagementCommodityContractsMember 2020-03-31 0000004904 aep:InterestRateMember 2020-01-01 2020-03-31 0000004904 us-gaap:CommodityContractMember 2020-01-01 2020-03-31 0000004904 aep:InterestRateMember 2019-12-31 0000004904 us-gaap:CommodityContractMember 2019-12-31 0000004904 us-gaap:CommodityContractMember 2020-03-31 0000004904 us-gaap:CommodityContractMember 2019-01-01 2019-12-31 0000004904 aep:InterestRateMember 2019-01-01 2019-12-31 0000004904 aep:AppalachianPowerCoMember aep:NetAmountsOfAssetsLiabilitiesPresentedInStatementOfFinancialPositionMember 2020-03-31 0000004904 aep:AppalachianPowerCoMember us-gaap:CommodityContractMember aep:RiskManagementCommodityContractsMember 2020-03-31 0000004904 aep:AppalachianPowerCoMember aep:InterestRateMember aep:HedgingContractsMember 2020-03-31 0000004904 aep:AppalachianPowerCoMember aep:GrossAmountsOffsetInStatementOfFinancialPositionMember 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:InterestRateMember 2019-01-01 2019-12-31 0000004904 aep:IndianaMichiganPowerCoMember aep:InterestRateMember 2019-12-31 0000004904 aep:AppalachianPowerCoMember aep:InterestRateMember 2019-01-01 2019-12-31 0000004904 aep:IndianaMichiganPowerCoMember aep:InterestRateMember 2020-01-01 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:InterestRateMember 2019-12-31 0000004904 aep:AEPTexasInc.Member aep:InterestRateMember 2019-01-01 2019-12-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:InterestRateMember 2019-01-01 2019-12-31 0000004904 aep:AppalachianPowerCoMember aep:InterestRateMember 2019-12-31 0000004904 aep:IndianaMichiganPowerCoMember aep:InterestRateMember 2019-01-01 2019-12-31 0000004904 aep:AEPTexasInc.Member aep:InterestRateMember 2019-12-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:InterestRateMember 2019-12-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:InterestRateMember 2020-01-01 2020-03-31 0000004904 aep:AEPTexasInc.Member aep:InterestRateMember 2020-01-01 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:InterestRateMember 2020-01-01 2020-03-31 0000004904 aep:AppalachianPowerCoMember aep:InterestRateMember 2020-01-01 2020-03-31 0000004904 aep:GrossAmountsOfRiskManagementAssetsLiabilitiesRecognizedMember 2019-12-31 0000004904 aep:InterestRateMember aep:HedgingContractsMember 2019-12-31 0000004904 us-gaap:CommodityContractMember aep:HedgingContractsMember 2019-12-31 0000004904 aep:NetAmountsOfAssetsLiabilitiesPresentedInStatementOfFinancialPositionMember 2019-12-31 0000004904 aep:GrossAmountsOffsetInStatementOfFinancialPositionMember 2019-12-31 0000004904 us-gaap:CommodityContractMember aep:RiskManagementCommodityContractsMember 2019-12-31 0000004904 aep:AEPTexasInc.Member aep:HeatingOilAndGasolineContractMember 2019-12-31 0000004904 aep:PublicServiceCoOfOklahomaMember us-gaap:InterestRateContractMember 2019-12-31 0000004904 us-gaap:InterestRateContractMember 2019-12-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:PowerContractMember 2019-12-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:NaturalGasContractMember 2019-12-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:PowerContractMember 2019-12-31 0000004904 aep:AEPTexasInc.Member aep:PowerContractMember 2019-12-31 0000004904 aep:IndianaMichiganPowerCoMember aep:PowerContractMember 2019-12-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:InterestRateContractMember 2019-12-31 0000004904 aep:AppalachianPowerCoMember us-gaap:InterestRateContractMember 2019-12-31 0000004904 aep:OhioPowerCoMember us-gaap:InterestRateContractMember 2019-12-31 0000004904 aep:IndianaMichiganPowerCoMember aep:HeatingOilAndGasolineContractMember 2019-12-31 0000004904 aep:NaturalGasContractMember 2019-12-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:NaturalGasContractMember 2019-12-31 0000004904 aep:AppalachianPowerCoMember aep:HeatingOilAndGasolineContractMember 2019-12-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:HeatingOilAndGasolineContractMember 2019-12-31 0000004904 aep:AppalachianPowerCoMember aep:NaturalGasContractMember 2019-12-31 0000004904 aep:PowerContractMember 2019-12-31 0000004904 aep:IndianaMichiganPowerCoMember aep:NaturalGasContractMember 2019-12-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:HeatingOilAndGasolineContractMember 2019-12-31 0000004904 aep:OhioPowerCoMember aep:PowerContractMember 2019-12-31 0000004904 aep:AEPTexasInc.Member us-gaap:InterestRateContractMember 2019-12-31 0000004904 aep:OhioPowerCoMember aep:InterestRateMember 2019-12-31 0000004904 aep:AEPTexasInc.Member aep:NaturalGasContractMember 2019-12-31 0000004904 aep:AppalachianPowerCoMember aep:PowerContractMember 2019-12-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:InterestRateContractMember 2019-12-31 0000004904 aep:OhioPowerCoMember aep:HeatingOilAndGasolineContractMember 2019-12-31 0000004904 aep:OhioPowerCoMember aep:NaturalGasContractMember 2019-12-31 0000004904 aep:HeatingOilAndGasolineContractMember 2019-12-31 0000004904 aep:AppalachianPowerCoMember us-gaap:CommodityContractMember aep:RiskManagementCommodityContractsMember 2019-12-31 0000004904 aep:AppalachianPowerCoMember aep:GrossAmountsOffsetInStatementOfFinancialPositionMember 2019-12-31 0000004904 aep:AppalachianPowerCoMember aep:NetAmountsOfAssetsLiabilitiesPresentedInStatementOfFinancialPositionMember 2019-12-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:GrossAmountsOffsetInStatementOfFinancialPositionMember 2019-12-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:CommodityContractMember aep:RiskManagementCommodityContractsMember 2019-12-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:NetAmountsOfAssetsLiabilitiesPresentedInStatementOfFinancialPositionMember 2019-12-31 0000004904 aep:PublicServiceCoOfOklahomaMember us-gaap:CommodityContractMember aep:RiskManagementCommodityContractsMember 2019-12-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:NetAmountsOfAssetsLiabilitiesPresentedInStatementOfFinancialPositionMember 2019-12-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:GrossAmountsOffsetInStatementOfFinancialPositionMember 2019-12-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:NetAmountsOfAssetsLiabilitiesPresentedInStatementOfFinancialPositionMember 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember us-gaap:CommodityContractMember aep:RiskManagementCommodityContractsMember 2020-03-31 0000004904 aep:SouthwesternElectricPowerCoMember aep:GrossAmountsOffsetInStatementOfFinancialPositionMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:NetAmountsOfAssetsLiabilitiesPresentedInStatementOfFinancialPositionMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:CommodityContractMember aep:RiskManagementCommodityContractsMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:GrossAmountsOffsetInStatementOfFinancialPositionMember 2020-03-31 0000004904 us-gaap:CommodityContractMember aep:RiskManagementCommodityContractsMember 2020-03-31 0000004904 us-gaap:CommodityContractMember aep:HedgingContractsMember 2020-03-31 0000004904 aep:GrossAmountsOffsetInStatementOfFinancialPositionMember 2020-03-31 0000004904 aep:InterestRateMember aep:HedgingContractsMember 2020-03-31 0000004904 aep:NetAmountsOfAssetsLiabilitiesPresentedInStatementOfFinancialPositionMember 2020-03-31 0000004904 aep:GrossAmountsOfRiskManagementAssetsLiabilitiesRecognizedMember 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:GrossAmountsOffsetInStatementOfFinancialPositionMember 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember us-gaap:CommodityContractMember aep:RiskManagementCommodityContractsMember 2020-03-31 0000004904 aep:PublicServiceCoOfOklahomaMember aep:NetAmountsOfAssetsLiabilitiesPresentedInStatementOfFinancialPositionMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:NetAmountsOfAssetsLiabilitiesPresentedInStatementOfFinancialPositionMember 2019-12-31 0000004904 aep:IndianaMichiganPowerCoMember aep:GrossAmountsOffsetInStatementOfFinancialPositionMember 2019-12-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:CommodityContractMember aep:RiskManagementCommodityContractsMember 2019-12-31 0000004904 aep:AppalachianPowerCoMember srt:MaximumMember aep:EnergyContractsMember us-gaap:FairValueInputsLevel3Member 2019-12-31 0000004904 aep:AppalachianPowerCoMember us-gaap:FairValueInputsLevel3Member 2019-12-31 0000004904 aep:AppalachianPowerCoMember aep:EnergyContractsMember us-gaap:FairValueInputsLevel3Member 2019-12-31 0000004904 aep:AppalachianPowerCoMember srt:WeightedAverageMember aep:EnergyContractsMember us-gaap:FairValueInputsLevel3Member 2019-12-31 0000004904 aep:AppalachianPowerCoMember srt:MinimumMember aep:EnergyContractsMember us-gaap:FairValueInputsLevel3Member 2019-12-31 0000004904 aep:AppalachianPowerCoMember aep:FinancialTrasnsmissionRightsMember us-gaap:FairValueInputsLevel3Member 2019-12-31 0000004904 aep:AppalachianPowerCoMember srt:MinimumMember aep:FinancialTrasnsmissionRightsMember us-gaap:FairValueInputsLevel3Member 2019-12-31 0000004904 aep:AppalachianPowerCoMember srt:WeightedAverageMember aep:FinancialTrasnsmissionRightsMember us-gaap:FairValueInputsLevel3Member 2019-12-31 0000004904 aep:AppalachianPowerCoMember srt:MaximumMember aep:FinancialTrasnsmissionRightsMember us-gaap:FairValueInputsLevel3Member 2019-12-31 0000004904 aep:IndianaMichiganPowerCoMember aep:FinancialTrasnsmissionRightsMember us-gaap:FairValueInputsLevel3Member 2019-12-31 0000004904 aep:IndianaMichiganPowerCoMember srt:WeightedAverageMember aep:FinancialTrasnsmissionRightsMember us-gaap:FairValueInputsLevel3Member 2019-12-31 0000004904 aep:IndianaMichiganPowerCoMember aep:EnergyContractsMember us-gaap:FairValueInputsLevel3Member 2019-12-31 0000004904 aep:IndianaMichiganPowerCoMember srt:MinimumMember aep:EnergyContractsMember us-gaap:FairValueInputsLevel3Member 2019-12-31 0000004904 aep:IndianaMichiganPowerCoMember srt:MinimumMember aep:FinancialTrasnsmissionRightsMember us-gaap:FairValueInputsLevel3Member 2019-12-31 0000004904 aep:IndianaMichiganPowerCoMember srt:WeightedAverageMember aep:EnergyContractsMember us-gaap:FairValueInputsLevel3Member 2019-12-31 0000004904 aep:IndianaMichiganPowerCoMember srt:MaximumMember aep:FinancialTrasnsmissionRightsMember us-gaap:FairValueInputsLevel3Member 2019-12-31 0000004904 aep:IndianaMichiganPowerCoMember srt:MaximumMember aep:EnergyContractsMember us-gaap:FairValueInputsLevel3Member 2019-12-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:FairValueInputsLevel3Member 2019-12-31 0000004904 aep:SpentNuclearFuelandDecommissioningTrustsMember 2019-01-01 2019-12-31 0000004904 aep:WithinCurrentYearMember us-gaap:FairValueInputsLevel3Member 2019-12-31 0000004904 aep:MaturityPeriod2Member us-gaap:FairValueInputsLevel3Member 2020-03-31 0000004904 aep:MaturityPeriod2Member us-gaap:FairValueInputsLevel3Member 2019-12-31 0000004904 aep:SpentNuclearFuelandDecommissioningTrustsMember 2020-03-31 0000004904 aep:SpentNuclearFuelandDecommissioningTrustsMember 2019-12-31 0000004904 aep:MaturityPeriodFourMember us-gaap:FairValueInputsLevel3Member 2020-03-31 0000004904 aep:WithinCurrentYearMember us-gaap:FairValueInputsLevel3Member 2020-03-31 0000004904 aep:SpentNuclearFuelandDecommissioningTrustsMember 2020-01-01 2020-03-31 0000004904 aep:MaturityPeriod2Member us-gaap:FairValueInputsLevel2Member 2019-12-31 0000004904 aep:WithinCurrentYearMember us-gaap:FairValueInputsLevel2Member 2019-12-31 0000004904 aep:MaturityPeriodFourMember us-gaap:FairValueInputsLevel3Member 2019-12-31 0000004904 aep:MaturityPeriod2Member us-gaap:FairValueInputsLevel1Member 2020-03-31 0000004904 aep:MaturityPeriod3Member us-gaap:FairValueInputsLevel3Member 2019-12-31 0000004904 aep:MaturityPeriod2Member us-gaap:FairValueInputsLevel2Member 2020-03-31 0000004904 aep:EquityunitsMember 2019-12-31 0000004904 aep:MaturityPeriod3Member us-gaap:FairValueInputsLevel2Member 2020-03-31 0000004904 aep:WithinCurrentYearMember us-gaap:FairValueInputsLevel2Member 2020-03-31 0000004904 aep:EquityunitsMember 2020-03-31 0000004904 aep:MaturityPeriod3Member us-gaap:FairValueInputsLevel3Member 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:CorporateDebtSecuritiesMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:PortionAtOtherThanFairValueFairValueDisclosureMember us-gaap:StateAndLocalJurisdictionMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:FairValueInputsLevel1Member us-gaap:CashAndCashEquivalentsMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:PortionAtOtherThanFairValueFairValueDisclosureMember aep:DomesticMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:RiskManagementCommodityContractsMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:FairValueInputsLevel1Member 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:FairValueInputsLevel1Member us-gaap:USGovernmentAgenciesDebtSecuritiesMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:FairValueInputsLevel3Member us-gaap:FixedIncomeFundsMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:FairValueInputsLevel2Member 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:FairValueInputsLevel1Member us-gaap:CorporateDebtSecuritiesMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:PortionAtOtherThanFairValueFairValueDisclosureMember us-gaap:CorporateDebtSecuritiesMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:FairValueInputsLevel3Member aep:DomesticMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:RiskManagementCommodityContractsMember us-gaap:FairValueInputsLevel2Member 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:FixedIncomeFundsMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:PortionAtOtherThanFairValueFairValueDisclosureMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:RiskManagementCommodityContractsMember us-gaap:PortionAtOtherThanFairValueFairValueDisclosureMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:FairValueInputsLevel2Member aep:DomesticMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:PortionAtOtherThanFairValueFairValueDisclosureMember us-gaap:FixedIncomeFundsMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:FairValueInputsLevel2Member us-gaap:CashAndCashEquivalentsMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:FairValueInputsLevel2Member us-gaap:FixedIncomeFundsMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:FairValueInputsLevel2Member us-gaap:CorporateDebtSecuritiesMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:CashAndCashEquivalentsMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:FairValueInputsLevel3Member us-gaap:USGovernmentAgenciesDebtSecuritiesMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:FairValueInputsLevel1Member aep:DomesticMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:RiskManagementCommodityContractsMember us-gaap:FairValueInputsLevel3Member 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:FairValueInputsLevel3Member us-gaap:CashAndCashEquivalentsMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember aep:RiskManagementCommodityContractsMember us-gaap:FairValueInputsLevel1Member 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:FairValueInputsLevel1Member us-gaap:StateAndLocalJurisdictionMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:FairValueInputsLevel2Member us-gaap:StateAndLocalJurisdictionMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:FairValueInputsLevel3Member 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:FairValueInputsLevel2Member us-gaap:USGovernmentAgenciesDebtSecuritiesMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:FairValueInputsLevel3Member us-gaap:StateAndLocalJurisdictionMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:StateAndLocalJurisdictionMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:FairValueInputsLevel3Member us-gaap:CorporateDebtSecuritiesMember 2020-03-31 0000004904 aep:IndianaMichiganPowerCoMember us-gaap:FairValueInputsLevel1Member us-gaap:FixedIncomeFundsMember 2020-03-31 0000004904