Income Taxes - Reconciliation of Income Tax Provision (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Line Items]
Statutory income tax provision (benefit)	$ 235	$ 39	$ (535)
State, local and foreign income tax provision (benefit), net of federal tax effect	22	0	(37)
Book expenses not deductible for tax purposes	38	22	23
Change in valuation allowance	3	0	0
Other, net	1	(2)	(6)
Total income tax provision (benefit)	299	59	(555)
American Airlines, Inc.
Income Tax Disclosure [Line Items]
Statutory income tax provision (benefit)	332	95	(478)
State, local and foreign income tax provision (benefit), net of federal tax effect	25	3	(37)
Book expenses not deductible for tax purposes	35	20	21
Change in valuation allowance	3	0	0
Other, net	(1)	(2)	(6)
Total income tax provision (benefit)	$ 394	$ 116	$ (500)