Revenue Recognition - Changes in Loyalty Program Liability (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Movement In Contract With Customer, Liability [Roll Forward]
Beginning balance	$ 13,423
Ending balance	14,324
Loyalty program liability [Member]
Movement In Contract With Customer, Liability [Roll Forward]
Beginning balance	8,615
Deferral of revenue	887
Recognition of revenue	(651)
Ending balance	$ 8,851
Inactive period before expiration of mileage credits	18 months
Deferred revenue, current	$ 3,094	$ 3,193
American Airlines, Inc. [Member]
Movement In Contract With Customer, Liability [Roll Forward]
Beginning balance	13,423
Ending balance	14,324
American Airlines, Inc. [Member] | Loyalty program liability [Member]
Movement In Contract With Customer, Liability [Roll Forward]
Beginning balance	8,615
Deferral of revenue	887
Recognition of revenue	(651)
Ending balance	$ 8,851
Inactive period before expiration of mileage credits	18 months
Deferred revenue, current	$ 3,094	$ 3,193