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REVENUE FROM CONTRACTS WITH CUSTOMERS - Affiliate Accounts Receivable (Details) - Related Party - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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AEP Texas |  |
Disaggregation of Revenue [Line Items] |  |
Affiliated Companies | $ 0.1 | $ 0.0
AEPTCo |  |
Disaggregation of Revenue [Line Items] |  |
Affiliated Companies | 143.7 | 131.6
APCo |  |
Disaggregation of Revenue [Line Items] |  |
Affiliated Companies | 93.9 | 83.7
I&M |  |
Disaggregation of Revenue [Line Items] |  |
Affiliated Companies | 58.2 | 55.0
OPCo |  |
Disaggregation of Revenue [Line Items] |  |
Affiliated Companies | 65.3 | 63.6
PSO |  |
Disaggregation of Revenue [Line Items] |  |
Affiliated Companies | 19.9 | 13.0
SWEPCo |  |
Disaggregation of Revenue [Line Items] |  |
Affiliated Companies | $ 53.0 | $ 21.4

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