FINANCING ACTIVITIES - Schedule of Average Interest Rates for Funds Borrowed from and Loaned to Utility Money Pool (Details) - Utility	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
AEP Texas
Short-Term Debt [Line Items]
Average Interest Rate for Funds Borrowed	4.69%	5.70%
Average Interest Rate for Funds Loaned	4.72%	5.49%
AEPTCo
Short-Term Debt [Line Items]
Average Interest Rate for Funds Borrowed	4.68%	5.71%
Average Interest Rate for Funds Loaned	4.62%	5.62%
APCo
Short-Term Debt [Line Items]
Average Interest Rate for Funds Borrowed	4.69%	5.73%
Average Interest Rate for Funds Loaned	4.58%	5.64%
I&M
Short-Term Debt [Line Items]
Average Interest Rate for Funds Borrowed	4.69%	5.67%
Average Interest Rate for Funds Loaned	4.64%	5.68%
OPCo
Short-Term Debt [Line Items]
Average Interest Rate for Funds Borrowed	4.65%	5.70%
Average Interest Rate for Funds Loaned	4.70%	5.52%
PSO
Short-Term Debt [Line Items]
Average Interest Rate for Funds Borrowed	4.67%	5.64%
Average Interest Rate for Funds Loaned	4.68%	0.00%
SWEPCo
Short-Term Debt [Line Items]
Average Interest Rate for Funds Borrowed	4.69%	5.64%
Average Interest Rate for Funds Loaned	4.65%	0.00%