Income Taxes - Reconciliation of Income Tax Provision (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Line Items]
Statutory income tax provision	$ 242	$ 235	$ 39
State, local and foreign income tax provision, net of federal tax effect	21	22	0
Book expenses not deductible for tax purposes	44	38	22
Change in valuation allowance	0	3	0
Other, net	1	1	(2)
Total income tax provision	308	299	59
American Airlines, Inc.
Income Tax Disclosure [Line Items]
Statutory income tax provision	354	332	95
State, local and foreign income tax provision, net of federal tax effect	30	25	3
Book expenses not deductible for tax purposes	40	35	20
Change in valuation allowance	0	3	0
Other, net	2	(1)	(2)
Total income tax provision	$ 426	$ 394	$ 116