Revenue Recognition - Changes in Loyalty Program Liability (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Movement In Contract With Customer, Liability [Roll Forward]
Beginning balance	$ 16,813
Ending balance	18,606
American Airlines, Inc.
Movement In Contract With Customer, Liability [Roll Forward]
Beginning balance	16,813
Ending balance	18,606
Loyalty program liability
Movement In Contract With Customer, Liability [Roll Forward]
Beginning balance	10,054
Deferral of revenue	3,362
Recognition of revenue	(2,902)
Ending balance	$ 10,514
Inactive period before expiration of mileage credits (in months)	24 months
Deferred revenue, current	$ 3,699	$ 3,556
Revenue recognition term (in months)	12 months
Loyalty program liability | American Airlines, Inc.
Movement In Contract With Customer, Liability [Roll Forward]
Beginning balance	$ 10,054
Deferral of revenue	3,362
Recognition of revenue	(2,902)
Ending balance	$ 10,514
Inactive period before expiration of mileage credits (in months)	24 months
Deferred revenue, current	$ 3,699	$ 3,556
Revenue recognition term (in months)	12 months