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BENEFIT PLANS - Qualified Pension Contribution (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2025 | Jun. 30, 2024
Defined Benefit Plan Disclosure [Line Items] |  |
Qualified pension contribution | $ 94.7 | $ 0.0
AEP Texas |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Qualified pension contribution | 12.0 | 0.0
APCo |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Qualified pension contribution | 0.4 |
I&M |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Qualified pension contribution | 2.1 |
PSO |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Qualified pension contribution | 1.4 |
SWEPCo |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Qualified pension contribution | $ 8.8 | $ 0.0

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