RELATED PARTY TRANSACTIONS - Contributions (Details) - Charitable Contributions - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Related Party Transaction [Line Items]
Related party transaction, amount	$ 10,000,000	$ 0	$ 0
AEP Texas
Related Party Transaction [Line Items]
Related party transaction, amount	1,000,000
AEPTCo
Related Party Transaction [Line Items]
Related party transaction, amount	2,000,000
APCo
Related Party Transaction [Line Items]
Related party transaction, amount	2,000,000
I&M
Related Party Transaction [Line Items]
Related party transaction, amount	1,000,000
OPCo
Related Party Transaction [Line Items]
Related party transaction, amount	1,000,000
PSO
Related Party Transaction [Line Items]
Related party transaction, amount	1,000,000
SWEPCo
Related Party Transaction [Line Items]
Related party transaction, amount	$ 1,000,000