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, 2024	Dec. 31, 2023	Dec. 31, 2022
SOUTHWESTERN ELECTRIC POWER COMPANY
Short-Term Debt [Line Items]
Maximum Interest Rate	5.79%	5.81%	5.28%
Minimum Interest Rate	4.74%	4.66%	0.10%
OHIO POWER COMPANY
Short-Term Debt [Line Items]
Maximum Interest Rate	5.79%	5.81%	5.28%
Minimum Interest Rate	4.74%	4.66%	0.10%
INDIANA MICHIGAN POWER COMPANY
Short-Term Debt [Line Items]
Maximum Interest Rate	5.79%	5.81%	5.28%
Minimum Interest Rate	4.74%	4.66%	0.10%
AEP TEXAS INC.
Short-Term Debt [Line Items]
Maximum Interest Rate	5.79%	5.81%	5.28%
Minimum Interest Rate	4.74%	4.66%	0.10%
APPALACHIAN POWER COMPANY
Short-Term Debt [Line Items]
Maximum Interest Rate	5.79%	5.81%	5.28%
Minimum Interest Rate	4.74%	4.66%	0.10%
PUBLIC SERVICE COMPANY OF OKLAHOMA
Short-Term Debt [Line Items]
Maximum Interest Rate	5.79%	5.81%	5.28%
Minimum Interest Rate	4.74%	4.66%	0.10%
AEP TRANSMISSION COMPANY, LLC
Short-Term Debt [Line Items]
Maximum Interest Rate	5.79%	5.81%	5.28%
Minimum Interest Rate	4.74%	4.66%	0.10%