FINANCING ACTIVITIES - Schedule of Direct Borrowing Activity (Details) - Direct Borrowing $ in Millions |
6 Months Ended |
|---|---|
|
Jun. 30, 2025
USD ($)
| |
| AEPTCo | |
| Short-Term Debt [Line Items] | |
| Maximum Borrowings | $ 106.6 |
| Maximum Loans | 132.6 |
| Average Borrowings | 13.6 |
| Average Loans | 38.2 |
| Borrowings | 10.5 |
| Loans | 0.0 |
| Authorized Short-term Borrowing Limit | 0.0 |
| SWTCo | |
| Short-Term Debt [Line Items] | |
| Maximum Borrowings | 2.0 |
| Maximum Loans | 0.0 |
| Average Borrowings | 1.9 |
| Average Loans | 0.0 |
| Borrowings | 2.0 |
| Loans | 0.0 |
| Authorized Short-term Borrowing Limit | 50.0 |
| Midwest Transmission Holdings | |
| Short-Term Debt [Line Items] | |
| Maximum Borrowings | 0.0 |
| Maximum Loans | 32.6 |
| Average Borrowings | 0.0 |
| Average Loans | 11.0 |
| Borrowings | 0.0 |
| Loans | 0.0 |
| Authorized Short-term Borrowing Limit | $ 0.0 |