Leases - Components of Lease Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 1,851	$ 2,016	$ 2,007
Finance lease cost:
Amortization of assets	132	128	143
Interest on lease liabilities	39	45	47
Variable lease cost	3,075	2,720	2,580
Total net lease cost	5,097	4,909	4,777
American Airlines, Inc.
Lessee, Lease, Description [Line Items]
Operating lease cost	1,828	1,992	1,987
Finance lease cost:
Amortization of assets	125	119	135
Interest on lease liabilities	39	44	46
Variable lease cost	3,059	2,703	2,572
Total net lease cost	$ 5,051	$ 4,858	$ 4,740