Leases - Components of Lease Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 2,012	$ 1,957	$ 2,027
Finance lease cost:
Amortization of assets	107	92	79
Interest on lease liabilities	44	38	43
Variable lease cost	2,471	1,801	2,558
Total net lease cost	4,634	3,888	4,707
American Airlines, Inc.
Lessee, Lease, Description [Line Items]
Operating lease cost	1,998	1,943	2,012
Finance lease cost:
Amortization of assets	107	92	79
Interest on lease liabilities	44	38	43
Variable lease cost	2,461	1,786	2,542
Total net lease cost	$ 4,610	$ 3,859	$ 4,676