Leases - Components of Lease Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 1,704	$ 1,851	$ 2,016
Finance lease cost:
Amortization of assets	128	132	128
Interest on lease liabilities	48	39	45
Variable lease cost	3,395	3,075	2,720
Total net lease cost	5,275	5,097	4,909
American Airlines, Inc.
Lessee, Lease, Description [Line Items]
Operating lease cost	1,683	1,828	1,992
Finance lease cost:
Amortization of assets	123	125	119
Interest on lease liabilities	48	39	44
Variable lease cost	3,382	3,059	2,703
Total net lease cost	$ 5,236	$ 5,051	$ 4,858