Basis of Presentation and Summary of Significant Accounting Policies - Changes in Loyalty Program Liability (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Movement In Contract With Customer, Liability [Roll Forward]
Beginning balance	$ 13,952
Ending balance	15,222
Loyalty program liability
Movement In Contract With Customer, Liability [Roll Forward]
Beginning balance	9,195
Deferral of revenue	2,161
Recognition of revenue	(2,221)
Ending balance	$ 9,135
Inactive period before expiration of mileage credits	18 months
Customer liabilities	$ 2,896	$ 2,033
American Airlines, Inc.
Movement In Contract With Customer, Liability [Roll Forward]
Beginning balance	13,952
Ending balance	15,222
American Airlines, Inc. | Loyalty program liability
Movement In Contract With Customer, Liability [Roll Forward]
Beginning balance	9,195
Deferral of revenue	2,161
Recognition of revenue	(2,221)
Ending balance	$ 9,135
Inactive period before expiration of mileage credits	18 months
Customer liabilities	$ 2,896	$ 2,033