Leases - Supplemental Cash Flow and Other Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 2,033	$ 1,990	$ 2,053
Operating cash flows from finance leases	48	47	37
Financing cash flows from finance leases	265	190	126
Gain on sale leaseback transactions, net	12	2	25
American Airlines, Inc.
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	2,011	1,968	2,040
Operating cash flows from finance leases	47	46	37
Financing cash flows from finance leases	255	179	126
Gain on sale leaseback transactions, net	$ 12	$ 2	$ 25