Transactions with Related Parties - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Related Party Transaction [Line Items]
Capacity purchases from third-party regional carriers	$ 5,448	$ 5,042	$ 4,643
American Airlines, Inc.
Related Party Transaction [Line Items]
Capacity purchases from third-party regional carriers	5,406	5,009	4,619
American Airlines, Inc. | Regional Carrier | AAG's Wholly-owned Subsidiaries | Airline Capacity Purchase Arrangements
Related Party Transaction [Line Items]
Capacity purchases from third-party regional carriers	$ 3,200	$ 2,900	$ 2,700