FINANCING ACTIVITIES - Schedule of Nonutility Money Pool Activity (Details) - Nonutility - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
AEP TEXAS INC.
Short-Term Debt [Line Items]
Maximum Loans	$ 7.2	$ 7.1
Average Loans	7.1	6.9
AEP TEXAS INC. | Related Party
Short-Term Debt [Line Items]
Advances to Affiliates	7.2	7.1
SOUTHWESTERN ELECTRIC POWER COMPANY
Short-Term Debt [Line Items]
Maximum Loans	2.9	2.8
Average Loans	2.6	2.4
SOUTHWESTERN ELECTRIC POWER COMPANY | Related Party
Short-Term Debt [Line Items]
Advances to Affiliates	$ 2.3	$ 2.2