| Document and Entity Information | Mar. 30, 2020 |
| Entity Information [Line Items] | |
| Written Communications | false |
| Document Type | 8-K |
| Document Period End Date | Mar. 30, 2020 |
| Entity File Number | 1-3525 |
| Entity Registrant Name | AMERICAN ELECTRIC POWER CO INC. |
| Entity Incorporation, State or Country Code | NY |
| Entity Tax Identification Number | 13-4922640 |
| Entity Address, Address Line One | 1 Riverside Plaza, |
| Entity Address, City or Town | Columbus, |
| Entity Address, State or Province | OH |
| Entity Address, Postal Zip Code | 43215-2373 |
| City Area Code | (614) |
| Local Phone Number | 716-1000 |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000004904 |
| Amendment Flag | false |
| New York Stock Exchange | Common Stock, $6.50 par value | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Common Stock, $6.50 par value |
| Trading Symbol | AEP |
| Security Exchange Name | NYSE |
| New York Stock Exchange | 6.125% Corporate Unit | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | 6.125% Corporate Units |
| Trading Symbol | AEP PR B |
| Security Exchange Name | NYSE |
| AEP Texas Inc. [Member] | |
| Entity Information [Line Items] | |
| Written Communications | false |
| Entity File Number | 333-221643 |
| Entity Registrant Name | AEP TEXAS INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 51-0007707 |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001721781 |
| AEP Transmission Co [Member] | |
| Entity Information [Line Items] | |
| Written Communications | false |
| Entity File Number | 333-217143 |
| Entity Registrant Name | AEP TRANSMISSION COMPANY, LLC |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 46-1125168 |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001702494 |
| Appalachian Power Co [Member] | |
| Entity Information [Line Items] | |
| Written Communications | false |
| Entity File Number | 1-3457 |
| Entity Registrant Name | APPALACHIAN POWER COMPANY |
| Entity Incorporation, State or Country Code | VA |
| Entity Tax Identification Number | 54-0124790 |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000006879 |
| Indiana Michigan Power Co [Member] | |
| Entity Information [Line Items] | |
| Written Communications | false |
| Entity File Number | 1-3570 |
| Entity Registrant Name | INDIANA MICHIGAN POWER COMPANY |
| Entity Incorporation, State or Country Code | IN |
| Entity Tax Identification Number | 35-0410455 |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000050172 |
| Ohio Power Co [Member] | |
| Entity Information [Line Items] | |
| Written Communications | false |
| Entity File Number | 1-6543 |
| Entity Registrant Name | OHIO POWER COMPANY |
| Entity Incorporation, State or Country Code | OH |
| Entity Tax Identification Number | 31-4271000 |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000073986 |
| Public Service Co Of Oklahoma [Member] | |
| Entity Information [Line Items] | |
| Written Communications | false |
| Entity File Number | 0-343 |
| Entity Registrant Name | PUBLIC SERVICE COMPANY OF OKLAHOMA |
| Entity Incorporation, State or Country Code | OK |
| Entity Tax Identification Number | 73-0410895 |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000081027 |
| Southwestern Electric Power Co [Member] | |
| Entity Information [Line Items] | |
| Written Communications | false |
| Entity File Number | 1-3146 |
| Entity Registrant Name | SOUTHWESTERN ELECTRIC POWER COMPANY |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 72-0323455 |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000092487 |
