Leases - Supplemental Cash Flow and Other Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 1,647	$ 1,830	$ 2,033
Operating cash flows from finance leases	48	40	48
Financing cash flows from finance leases	122	152	265
Gain (loss) on sale leaseback transactions, net	(13)	76	12
American Airlines, Inc.
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	1,633	1,810	2,011
Operating cash flows from finance leases	48	40	47
Financing cash flows from finance leases	120	145	255
Gain (loss) on sale leaseback transactions, net	$ (13)	$ 76	$ 12