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FINANCING ACTIVITIES - Schedule of Proceeds on Sale of Receivables to AEP Credit (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
APPALACHIAN POWER COMPANY |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Proceeds from sale of receivables to AEP Credit | $ 1,953.7 | $ 1,819.8 | $ 1,552.9
INDIANA MICHIGAN POWER COMPANY |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Proceeds from sale of receivables to AEP Credit | 2,105.3 | 2,054.8 | 2,045.6
OHIO POWER COMPANY |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Proceeds from sale of receivables to AEP Credit | 3,197.8 | 3,339.3 | 3,101.3
PUBLIC SERVICE COMPANY OF OKLAHOMA |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Proceeds from sale of receivables to AEP Credit | 1,781.3 | 1,944.5 | 1,809.5
SOUTHWESTERN ELECTRIC POWER COMPANY |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Proceeds from sale of receivables to AEP Credit | $ 1,838.1 | $ 1,866.4 | $ 1,858.4

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