FINANCING ACTIVITIES - Schedule of Maximum and Minimum Interest Rates for Funds Either Borrowed from or Loaned to Utility Money Pool (Details) - Utility |
9 Months Ended | |
|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| AEPTCo | ||
| Short-Term Debt [Line Items] | ||
| Maximum Interest Rate | 4.26% | 4.83% |
| Minimum Interest Rate | 2.57% | 4.00% |
| APCo | ||
| Short-Term Debt [Line Items] | ||
| Maximum Interest Rate | 4.26% | 4.83% |
| Minimum Interest Rate | 2.57% | 4.00% |
| SWEPCo | ||
| Short-Term Debt [Line Items] | ||
| Maximum Interest Rate | 4.26% | 4.83% |
| Minimum Interest Rate | 2.57% | 4.00% |
| PSO | ||
| Short-Term Debt [Line Items] | ||
| Maximum Interest Rate | 4.26% | 4.83% |
| Minimum Interest Rate | 2.57% | 4.00% |
| I&M | ||
| Short-Term Debt [Line Items] | ||
| Maximum Interest Rate | 4.26% | 4.83% |
| Minimum Interest Rate | 2.57% | 4.00% |
| AEP Texas | ||
| Short-Term Debt [Line Items] | ||
| Maximum Interest Rate | 4.26% | 4.83% |
| Minimum Interest Rate | 2.57% | 4.00% |
| OPCo | ||
| Short-Term Debt [Line Items] | ||
| Maximum Interest Rate | 4.26% | 4.83% |
| Minimum Interest Rate | 2.57% | 4.00% |