STOCK-BASED COMPENSATION - Performance Shares Earned (Details) - Performance Shares - shares	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance Score	137.10%	109.80%	106.10%
Performance Shares Earned (in shares)	477,932	477,487	540,863
Performance Shares Mandatorily Deferred as AEP Career Shares (in shares)	12,337	39,172	70,377
Performance Shares Voluntarily Deferred into the Incentive Compensation Deferral Program (in shares)	19,503	21,245	22,716
Performance Shares to be Settled (in shares)	446,092	417,070	447,770