BENEFIT PLANS - Schedule of Pension and OPEB Assets (Details)	Dec. 31, 2024	Dec. 31, 2023
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Asset allocations	100.00%	100.00%
Pension Plans | AEP TEXAS INC.
Defined Benefit Plan Disclosure [Line Items]
Asset allocations	7.90%	8.10%
Pension Plans | APPALACHIAN POWER COMPANY
Defined Benefit Plan Disclosure [Line Items]
Asset allocations	13.30%	13.40%
Pension Plans | INDIANA MICHIGAN POWER COMPANY
Defined Benefit Plan Disclosure [Line Items]
Asset allocations	13.80%	13.40%
Pension Plans | OHIO POWER COMPANY
Defined Benefit Plan Disclosure [Line Items]
Asset allocations	10.40%	10.20%
Pension Plans | PUBLIC SERVICE COMPANY OF OKLAHOMA
Defined Benefit Plan Disclosure [Line Items]
Asset allocations	5.50%	5.40%
Pension Plans | SOUTHWESTERN ELECTRIC POWER COMPANY
Defined Benefit Plan Disclosure [Line Items]
Asset allocations	5.20%	5.50%
OPEB
Defined Benefit Plan Disclosure [Line Items]
Asset allocations	100.00%	100.00%
OPEB | AEP TEXAS INC.
Defined Benefit Plan Disclosure [Line Items]
Asset allocations	8.30%	8.20%
OPEB | APPALACHIAN POWER COMPANY
Defined Benefit Plan Disclosure [Line Items]
Asset allocations	14.40%	14.50%
OPEB | INDIANA MICHIGAN POWER COMPANY
Defined Benefit Plan Disclosure [Line Items]
Asset allocations	11.90%	12.20%
OPEB | OHIO POWER COMPANY
Defined Benefit Plan Disclosure [Line Items]
Asset allocations	10.40%	10.60%
OPEB | PUBLIC SERVICE COMPANY OF OKLAHOMA
Defined Benefit Plan Disclosure [Line Items]
Asset allocations	5.40%	5.40%
OPEB | SOUTHWESTERN ELECTRIC POWER COMPANY
Defined Benefit Plan Disclosure [Line Items]
Asset allocations	6.80%	6.60%