Leases - Supplemental Cash Flow and Other Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 2,053	$ 2,028	$ 2,013
Operating cash flows from finance leases	37	39	43
Financing cash flows from finance leases	126	114	83
Non-cash transactions:
ROU assets acquired through operating leases	1,386	917	1,145
Property and equipment acquired through finance leases	180	11	20
Operating lease conversion to finance lease	102	5	41
Gain on sale leaseback transactions, net	25	107	107
American Airlines, Inc.
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	2,040	2,015	1,996
Operating cash flows from finance leases	37	39	43
Financing cash flows from finance leases	126	114	83
Non-cash transactions:
ROU assets acquired through operating leases	1,381	898	1,144
Property and equipment acquired through finance leases	180	11	20
Operating lease conversion to finance lease	102	5	41
Gain on sale leaseback transactions, net	$ 25	$ 107	$ 107