FINANCING ACTIVITIES - Schedule of Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool (Details) - Utility	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
AEP TEXAS INC.
Short-Term Debt [Line Items]
Average Interest Rate for Funds Borrowed	5.48%	5.46%	1.08%
Average Interest Rate for Funds Loaned	5.45%	5.71%	1.99%
AEP TRANSMISSION COMPANY, LLC
Short-Term Debt [Line Items]
Average Interest Rate for Funds Borrowed	5.51%	5.41%	1.81%
Average Interest Rate for Funds Loaned	5.50%	5.56%	2.47%
APPALACHIAN POWER COMPANY
Short-Term Debt [Line Items]
Average Interest Rate for Funds Borrowed	5.51%	5.54%	2.34%
Average Interest Rate for Funds Loaned	5.41%	5.54%	2.39%
INDIANA MICHIGAN POWER COMPANY
Short-Term Debt [Line Items]
Average Interest Rate for Funds Borrowed	5.40%	5.14%	2.57%
Average Interest Rate for Funds Loaned	5.44%	5.57%	2.20%
OHIO POWER COMPANY
Short-Term Debt [Line Items]
Average Interest Rate for Funds Borrowed	5.70%	5.43%	3.51%
Average Interest Rate for Funds Loaned	5.20%	5.60%	1.22%
PUBLIC SERVICE COMPANY OF OKLAHOMA
Short-Term Debt [Line Items]
Average Interest Rate for Funds Borrowed	5.50%	5.51%	2.65%
Average Interest Rate for Funds Loaned	4.79%	5.35%	0.75%
SOUTHWESTERN ELECTRIC POWER COMPANY
Short-Term Debt [Line Items]
Average Interest Rate for Funds Borrowed	5.41%	5.34%	2.80%
Average Interest Rate for Funds Loaned	4.78%	5.72%	0.55%