Valuation and Qualifying Accounts (Details) - Allowance for obsolescence of spare parts - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning  of Year	$ 616	$ 634	$ 490
Additions Charged to Statement of Operations Accounts	98	96	177
Deductions and Other	14	(114)	(33)
Balance at End of Year	728	616	634
American Airlines, Inc.
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning  of Year	566	588	442
Additions Charged to Statement of Operations Accounts	83	82	165
Deductions and Other	26	(104)	(19)
Balance at End of Year	$ 675	$ 566	$ 588