Basis of Presentation and Summary of Significant Accounting Policies - Changes in Loyalty Program Liability (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Movement In Contract With Customer, Liability [Roll Forward]
Beginning balance	$ 16,813
Ending balance	17,722
Loyalty program liability
Movement In Contract With Customer, Liability [Roll Forward]
Beginning balance	10,054
Deferral of revenue	4,445
Recognition of revenue	(3,935)
Ending balance	$ 10,564
Inactive period before expiration of mileage credits	24 months
Customer liabilities, current	$ 3,725	$ 3,556
American Airlines, Inc.
Movement In Contract With Customer, Liability [Roll Forward]
Beginning balance	16,813
Ending balance	17,722
American Airlines, Inc. | Loyalty program liability
Movement In Contract With Customer, Liability [Roll Forward]
Beginning balance	10,054
Deferral of revenue	4,445
Recognition of revenue	(3,935)
Ending balance	$ 10,564
Inactive period before expiration of mileage credits	24 months
Customer liabilities, current	$ 3,725	$ 3,556