BENEFIT PLANS - Schedule of Expected Benefit Payments (Details) $ in Millions	Dec. 31, 2024 USD ($)
Pension Plans
Pension Plans and OPEB Benefit Payments
2025	$ 341.5
2026	340.4
2027	334.8
2028	335.7
2029	322.7
Years 2030 to 2034, in Total	1,530.3
Pension Plans \| AEP TEXAS INC.
Pension Plans and OPEB Benefit Payments
2025	32.2
2026	31.0
2027	28.8
2028	29.5
2029	27.8
Years 2030 to 2034, in Total	120.9
Pension Plans \| APPALACHIAN POWER COMPANY
Pension Plans and OPEB Benefit Payments
2025	42.3
2026	42.1
2027	40.0
2028	40.2
2029	38.6
Years 2030 to 2034, in Total	181.6
Pension Plans \| INDIANA MICHIGAN POWER COMPANY
Pension Plans and OPEB Benefit Payments
2025	40.1
2026	40.1
2027	39.0
2028	38.8
2029	37.1
Years 2030 to 2034, in Total	179.0
Pension Plans \| OHIO POWER COMPANY
Pension Plans and OPEB Benefit Payments
2025	31.6
2026	31.0
2027	30.8
2028	30.0
2029	29.5
Years 2030 to 2034, in Total	137.8
Pension Plans \| PUBLIC SERVICE COMPANY OF OKLAHOMA
Pension Plans and OPEB Benefit Payments
2025	17.3
2026	17.1
2027	17.1
2028	16.9
2029	15.1
Years 2030 to 2034, in Total	73.3
Pension Plans \| SOUTHWESTERN ELECTRIC POWER COMPANY
Pension Plans and OPEB Benefit Payments
2025	20.7
2026	19.2
2027	20.4
2028	19.4
2029	19.0
Years 2030 to 2034, in Total	88.4
OPEB
Pension Plans and OPEB Benefit Payments
2025	117.6
2026	116.4
2027	114.6
2028	112.4
2029	109.7
Years 2030 to 2034, in Total	504.7
OPEB Medicare Subsidy Receipts
2025	0.2
2026	0.3
2027	0.3
2027	0.3
2029	0.3
Years 2030 to 2034, in Total	1.4
OPEB \| AEP TEXAS INC.
Pension Plans and OPEB Benefit Payments
2025	9.5
2026	9.7
2027	9.7
2028	9.3
2029	8.9
Years 2030 to 2034, in Total	39.7
OPEB Medicare Subsidy Receipts
2025	0.0
2026	0.0
2027	0.0
2027	0.0
2029	0.0
Years 2030 to 2034, in Total	0.0
OPEB \| APPALACHIAN POWER COMPANY
Pension Plans and OPEB Benefit Payments
2025	18.8
2026	18.4
2027	18.1
2028	17.9
2029	17.4
Years 2030 to 2034, in Total	78.1
OPEB Medicare Subsidy Receipts
2025	0.1
2026	0.1
2027	0.1
2027	0.1
2029	0.1
Years 2030 to 2034, in Total	0.4
OPEB \| INDIANA MICHIGAN POWER COMPANY
Pension Plans and OPEB Benefit Payments
2025	14.5
2026	14.5
2027	14.2
2028	13.9
2029	13.6
Years 2030 to 2034, in Total	61.0
OPEB Medicare Subsidy Receipts
2025	0.0
2026	0.0
2027	0.0
2027	0.0
2029	0.0
Years 2030 to 2034, in Total	0.0
OPEB \| OHIO POWER COMPANY
Pension Plans and OPEB Benefit Payments
2025	12.0
2026	11.7
2027	11.5
2028	11.4
2029	11.0
Years 2030 to 2034, in Total	50.6
OPEB Medicare Subsidy Receipts
2025	0.0
2026	0.0
2027	0.0
2027	0.0
2029	0.0
Years 2030 to 2034, in Total	0.0
OPEB \| PUBLIC SERVICE COMPANY OF OKLAHOMA
Pension Plans and OPEB Benefit Payments
2025	6.6
2026	6.6
2027	6.3
2028	6.0
2029	5.9
Years 2030 to 2034, in Total	27.2
OPEB Medicare Subsidy Receipts
2025	0.0
2026	0.0
2027	0.0
2027	0.0
2029	0.0
Years 2030 to 2034, in Total	0.0
OPEB \| SOUTHWESTERN ELECTRIC POWER COMPANY
Pension Plans and OPEB Benefit Payments
2025	8.6
2026	8.3
2027	8.0
2028	8.0
2029	7.8
Years 2030 to 2034, in Total	35.7
OPEB Medicare Subsidy Receipts
2025	0.0
2026	0.0
2027	0.0
2027	0.0
2029	0.0
Years 2030 to 2034, in Total	$ 0.0

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