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BENEFIT PLANS - Schedule of Matching Contribution Costs (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Defined Contribution Plan Disclosure [Line Items] |  |  |
Defined contribution plan, cost | $ 81.5 | $ 87.9 | $ 81.9
AEP TEXAS INC. |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Defined contribution plan, cost | 6.8 | 7.1 | 6.5
APPALACHIAN POWER COMPANY |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Defined contribution plan, cost | 8.0 | 8.4 | 7.8
INDIANA MICHIGAN POWER COMPANY |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Defined contribution plan, cost | 10.7 | 11.0 | 11.1
OHIO POWER COMPANY |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Defined contribution plan, cost | 7.9 | 8.2 | 7.7
PUBLIC SERVICE COMPANY OF OKLAHOMA |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Defined contribution plan, cost | 5.3 | 5.3 | 4.7
SOUTHWESTERN ELECTRIC POWER COMPANY |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Defined contribution plan, cost | $ 6.5 | $ 6.7 | $ 6.4

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