FINANCING ACTIVITIES - Schedule of Nonutility Money Pool Activity (Details) - USD ($) $ in Millions |
6 Months Ended | |
|---|---|---|
Jun. 30, 2025 |
Dec. 31, 2024 |
|
| AEP Texas | ||
| Short-Term Debt [Line Items] | ||
| Advances to Affiliates | $ 7.1 | $ 7.2 |
| Nonutility | AEP Texas | ||
| Short-Term Debt [Line Items] | ||
| Maximum Loans | 7.2 | |
| Average Loans | 7.1 | |
| Nonutility | AEP Texas | Related Party | ||
| Short-Term Debt [Line Items] | ||
| Advances to Affiliates | 7.1 | |
| Nonutility | SWEPCo | ||
| Short-Term Debt [Line Items] | ||
| Maximum Loans | 2.4 | |
| Average Loans | 2.3 | |
| Nonutility | SWEPCo | Related Party | ||
| Short-Term Debt [Line Items] | ||
| Advances to Affiliates | $ 2.4 |