RELATED PARTY TRANSACTIONS - Contributions (Details) - Charitable Contributions - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Related Party Transaction [Line Items]
Related party transaction, amount	$ 0	$ 0	$ 75,000,000.0
AEP TEXAS INC.
Related Party Transaction [Line Items]
Related party transaction, amount			9,900,000
AEP TRANSMISSION COMPANY, LLC
Related Party Transaction [Line Items]
Related party transaction, amount			11,100,000
APPALACHIAN POWER COMPANY
Related Party Transaction [Line Items]
Related party transaction, amount			12,500,000
INDIANA MICHIGAN POWER COMPANY
Related Party Transaction [Line Items]
Related party transaction, amount			11,000,000.0
OHIO POWER COMPANY
Related Party Transaction [Line Items]
Related party transaction, amount			8,100,000
PUBLIC SERVICE COMPANY OF OKLAHOMA
Related Party Transaction [Line Items]
Related party transaction, amount			5,800,000
SOUTHWESTERN ELECTRIC POWER COMPANY
Related Party Transaction [Line Items]
Related party transaction, amount			$ 8,800,000