FINANCING ACTIVITIES - Schedule of Maximum, Minimum and Average Interest Rates for Funds Borrowed from and Loaned to the Nonutility Money Pool (Details) - Nonutility |
9 Months Ended | |
|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| AEP Texas | ||
| Short-Term Debt [Line Items] | ||
| Maximum Interest Rate for Funds Loaned | 4.22% | 4.76% |
| Minimum Interest Rate for Funds Loaned | 3.83% | 4.27% |
| Average Interest Rate for Funds Loaned | 4.01% | 4.66% |
| SWEPCo | ||
| Short-Term Debt [Line Items] | ||
| Maximum Interest Rate for Funds Loaned | 0.00% | 4.76% |
| Minimum Interest Rate for Funds Loaned | 0.00% | 4.62% |
| Average Interest Rate for Funds Loaned | 0.00% | 4.69% |