Basis of Presentation and Summary of Significant Accounting Policies - Changes in Loyalty Program Liability (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Movement In Contract With Customer, Liability [Roll Forward]
Beginning balance	$ 15,527
Ending balance	16,813
Loyalty program liability
Movement In Contract With Customer, Liability [Roll Forward]
Beginning balance	9,327
Deferral of revenue	4,482
Recognition of revenue	(3,755)
Ending balance	$ 10,054
Inactive period before expiration of mileage credits	24 months
Customer liabilities, current	$ 3,556	$ 3,453
American Airlines, Inc.
Movement In Contract With Customer, Liability [Roll Forward]
Beginning balance	15,527
Ending balance	16,813
American Airlines, Inc. | Loyalty program liability
Movement In Contract With Customer, Liability [Roll Forward]
Beginning balance	9,327
Deferral of revenue	4,482
Recognition of revenue	(3,755)
Ending balance	$ 10,054
Inactive period before expiration of mileage credits	24 months
Customer liabilities, current	$ 3,556	$ 3,453