FINANCING ACTIVITIES - Schedule of Maximum, Minimum and Average Interest Rates for Funds Borrowed from and Loaned to the Nonutility Money Pool (Details) - Nonutility |
6 Months Ended | |
|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| AEP TEXAS INC. | ||
| Short-Term Debt [Line Items] | ||
| Maximum Interest Rate for Funds Loaned | 4.13% | 4.76% |
| Minimum Interest Rate for Funds Loaned | 3.83% | 4.64% |
| Average Interest Rate for Funds Loaned | 3.99% | 4.70% |
| SOUTHWESTERN ELECTRIC POWER COMPANY | ||
| Short-Term Debt [Line Items] | ||
| Maximum Interest Rate for Funds Loaned | 0.00% | 4.76% |
| Minimum Interest Rate for Funds Loaned | 0.00% | 4.64% |
| Average Interest Rate for Funds Loaned | 0.00% | 4.70% |