| Document and Entity Information | Sep. 09, 2021 |
| Entity Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Sep. 9, 2021 |
| Entity Registrant Name | OHIO POWER COMPANY |
| Entity File Number | 1-6543 |
| Entity Incorporation, State or Country Code | OH |
| Entity Tax Identification Number | 31-4271000 |
| 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 |
| City Area Code | (614) |
| Local Phone Number | 716-1000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000073986 |
| Amendment Flag | false |
