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BENEFIT PLANS - Qualified Pension Contribution (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024
Defined Benefit Plan Disclosure [Line Items] |  |
Pension to qualified plan trust | $ 94.7 | $ 0.0
AEP Texas |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension to qualified plan trust | 12.0 | $ 0.0
APCo |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension to qualified plan trust | 0.4 |
I&M |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension to qualified plan trust | 2.1 |
PSO |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension to qualified plan trust | 1.4 |
SWEPCo |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension to qualified plan trust | $ 8.8 |

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