COMMITMENTS, GUARANTEES AND CONTINGENCIES - Potential Loss on Master Lease Agreements (Details) $ in Millions |
Jun. 30, 2025
USD ($)
|
|---|---|
| Other Commitments [Line Items] | |
| Maximum Potential Loss | $ 38.4 |
| AEP Texas | |
| Other Commitments [Line Items] | |
| Maximum Potential Loss | 8.3 |
| APCo | |
| Other Commitments [Line Items] | |
| Maximum Potential Loss | 5.2 |
| I&M | |
| Other Commitments [Line Items] | |
| Maximum Potential Loss | 3.9 |
| OPCo | |
| Other Commitments [Line Items] | |
| Maximum Potential Loss | 6.5 |
| PSO | |
| Other Commitments [Line Items] | |
| Maximum Potential Loss | 3.5 |
| SWEPCo | |
| Other Commitments [Line Items] | |
| Maximum Potential Loss | $ 4.3 |