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FINANCING ACTIVITIES - Schedule of Proceeds on Sale of Receivables to AEP Credit (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
APCo |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Proceeds from sale of receivables to AEP Credit | $ 604.8 | $ 536.0
I&M |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Proceeds from sale of receivables to AEP Credit | 584.8 | 529.7
OPCo |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Proceeds from sale of receivables to AEP Credit | 860.3 | 845.7
PSO |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Proceeds from sale of receivables to AEP Credit | 374.8 | 361.6
SWEPCo |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Proceeds from sale of receivables to AEP Credit | $ 428.1 | $ 425.4

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