Transactions with Related Parties - Net Receivables (Payables) to Related Parties (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Related Party Transaction [Line Items]
Accounts payable	$ (2,353)	$ (2,149)
Regional expenses	4,643	4,385	$ 3,204
American Airlines, Inc.
Related Party Transaction [Line Items]
Accounts payable	(2,232)	(2,071)
Total	7,070	6,588
Regional expenses	4,619	4,345	$ 3,111
American Airlines, Inc. | AAG
Related Party Transaction [Line Items]
AAG	9,144	8,692
American Airlines, Inc. | AAG's Wholly-owned Subsidiaries
Related Party Transaction [Line Items]
Accounts payable	$ (2,074)	$ (2,104)