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FINANCING ACTIVITIES - Schedule of Proceeds on Sale of Receivables to AEP Credit (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
APCo |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Proceeds from sale of receivables to AEP Credit | $ 495.4 | $ 504.6 | $ 1,530.0 | $ 1,487.9
I&M |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Proceeds from sale of receivables to AEP Credit | 682.6 | 576.7 | 1,812.7 | 1,608.5
OPCo |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Proceeds from sale of receivables to AEP Credit | 927.8 | 860.0 | 2,523.3 | 2,477.2
PSO |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Proceeds from sale of receivables to AEP Credit | 659.6 | 611.5 | 1,466.3 | 1,398.1
SWEPCo |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Proceeds from sale of receivables to AEP Credit | $ 549.9 | $ 531.4 | $ 1,434.0 | $ 1,428.7

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