Leases - Components of Lease Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 2,016	$ 2,007	$ 2,012
Finance lease cost:
Amortization of assets	128	143	107
Interest on lease liabilities	45	47	44
Variable lease cost	2,720	2,580	2,471
Total net lease cost	4,909	4,777	4,634
American Airlines, Inc.
Lessee, Lease, Description [Line Items]
Operating lease cost	1,992	1,987	1,998
Finance lease cost:
Amortization of assets	119	135	107
Interest on lease liabilities	44	46	44
Variable lease cost	2,703	2,572	2,461
Total net lease cost	$ 4,858	$ 4,740	$ 4,610