FINANCING ACTIVITIES - Schedule of Comparative Accounts Receivable Information (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Debt Disclosure [Abstract]
Effective Interest Rates on Securitization of Accounts Receivable	3.92%	4.62%
Net Uncollectible Accounts Receivable Written-Off	$ 8	$ 8

Effective interest rate on the amount owed for securitized accounts receivables.

No definition available.

Name:	aep_EffectiveInterestRatesOnSecuritizationOfAccountsReceivable
Namespace Prefix:	aep_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration