FINANCING ACTIVITIES - Schedule of Maximum and Minimum Interest Rates for Funds Either Borrowed from or Loaned to Utility Money Pool (Details) - Utility	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
SWEPCo
Short-Term Debt [Line Items]
Maximum Interest Rate	4.83%	5.79%	5.81%
Minimum Interest Rate	3.40%	4.74%	4.66%
OPCo
Short-Term Debt [Line Items]
Maximum Interest Rate	4.83%	5.79%	5.81%
Minimum Interest Rate	3.40%	4.74%	4.66%
I&M
Short-Term Debt [Line Items]
Maximum Interest Rate	4.83%	5.79%	5.81%
Minimum Interest Rate	3.40%	4.74%	4.66%
AEP Texas
Short-Term Debt [Line Items]
Maximum Interest Rate	4.83%	5.79%	5.81%
Minimum Interest Rate	3.40%	4.74%	4.66%
APCo
Short-Term Debt [Line Items]
Maximum Interest Rate	4.83%	5.79%	5.81%
Minimum Interest Rate	3.40%	4.74%	4.66%
PSO
Short-Term Debt [Line Items]
Maximum Interest Rate	4.83%	5.79%	5.81%
Minimum Interest Rate	3.40%	4.74%	4.66%
AEPTCo
Short-Term Debt [Line Items]
Maximum Interest Rate	4.83%	5.79%	5.81%
Minimum Interest Rate	3.40%	4.74%	4.66%