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BENEFIT PLANS - Schedule of Obligations in Excess of Fair Values Projected Benefit Obligation (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Defined Benefit Plan Disclosure [Line Items] |  |
Projected Benefit Obligation | $ 3,871.8 | $ 60.7
Fair Value of Plan Assets | 3,666.2 | 0.0
Underfunded Projected Benefit Obligation | (205.6) | (60.7)
AEP TEXAS INC. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected Benefit Obligation | 322.7 | 343.1
Fair Value of Plan Assets | 288.1 | 332.7
Underfunded Projected Benefit Obligation | (34.6) | (10.4)
APPALACHIAN POWER COMPANY |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected Benefit Obligation | 0.5 | 0.4
Fair Value of Plan Assets | 0.0 | 0.0
Underfunded Projected Benefit Obligation | (0.5) | (0.4)
INDIANA MICHIGAN POWER COMPANY |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected Benefit Obligation | 1.5 | 1.2
Fair Value of Plan Assets | 0.0 | 0.0
Underfunded Projected Benefit Obligation | (1.5) | (1.2)
OHIO POWER COMPANY |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected Benefit Obligation | 0.4 | 0.3
Fair Value of Plan Assets | 0.0 | 0.0
Underfunded Projected Benefit Obligation | (0.4) | (0.3)
PUBLIC SERVICE COMPANY OF OKLAHOMA |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected Benefit Obligation | 1.4 | 1.4
Fair Value of Plan Assets | 0.0 | 0.0
Underfunded Projected Benefit Obligation | (1.4) | (1.4)
SOUTHWESTERN ELECTRIC POWER COMPANY |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected Benefit Obligation | 227.8 | 261.2
Fair Value of Plan Assets | 188.8 | 227.5
Underfunded Projected Benefit Obligation | $ (39.0) | $ (33.7)

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