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FINANCING ACTIVITIES - Schedule of Proceeds on Sale of Receivables to AEP Credit (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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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

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