STOCK-BASED COMPENSATION - Performance Shares and AEP Career Shares (Details) - Performance Shares and AEP Career Shares (Reinvested Dividends Portion) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
AEP Common Stock Settlements for Performance Shares	$ 38.1	$ 41.8	$ 43.2
AEP Common Stock Settlements for Career Share Distributions	$ 8.4	$ 8.3	$ 5.1