FINANCING ACTIVITIES - Schedule of Maximum, Minimum and Average Interest Rates for Funds Borrowed from and Loaned to the Nonutility Money Pool (Details) - Nonutility	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
AEP Texas
Short-Term Debt [Line Items]
Maximum Interest Rate for Funds Loaned	4.76%	5.79%	5.81%
Minimum Interest Rate for Funds Loaned	3.89%	4.74%	4.66%
Average Interest Rate for Funds Loaned	4.52%	5.46%	5.54%
SWEPCo
Short-Term Debt [Line Items]
Maximum Interest Rate for Funds Loaned	4.76%	5.79%	5.81%
Minimum Interest Rate for Funds Loaned	4.62%	4.74%	4.66%
Average Interest Rate for Funds Loaned	4.69%	5.45%	5.56%