| Cover | Dec. 03, 2024 |
| Entity Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Dec. 03, 2024 |
| Registrant Name | PUBLIC SERVICE COMPANY OF OKLAHOMA |
| Entity Incorporation, State or Country Code | OK |
| Entity File Number | 0-343 |
| Entity Tax Identification Number | 73-0410895 |
| Entity Address, Address Line One | 1 Riverside Plaza, |
| Entity Address, State or Province | 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 |
| Amendment Flag | false |
| Central Index Key | 0000081027 |
