FINANCING ACTIVITIES - Schedule of Proceeds on Sale of Receivables to AEP Credit (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| APCo | ||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||
| Proceeds from sale of receivables to AEP Credit | $ 429.8 | $ 447.3 | $ 1,034.6 | $ 983.3 |
| I&M | ||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||
| Proceeds from sale of receivables to AEP Credit | 545.4 | 502.1 | 1,130.2 | 1,031.8 |
| OPCo | ||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||
| Proceeds from sale of receivables to AEP Credit | 735.2 | 771.5 | 1,595.5 | 1,617.2 |
| PSO | ||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||
| Proceeds from sale of receivables to AEP Credit | 431.9 | 425.0 | 806.7 | 786.6 |
| SWEPCo | ||||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||||
| Proceeds from sale of receivables to AEP Credit | $ 456.0 | $ 471.9 | $ 884.1 | $ 897.3 |