Revenue Recognition - Changes in Loyalty Program Liability (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Movement In Contract With Customer, Liability [Roll Forward]
Beginning balance	$ 12,878
Ending balance	$ 14,515
Inactive period before expiration of mileage credits	18 months
Loyalty program liability [Member]
Movement In Contract With Customer, Liability [Roll Forward]
Beginning balance	$ 8,539
Deferral of revenue	1,806
Recognition of revenue	(1,786)
Ending balance	8,559
Deferred revenue, current	3,310	$ 3,267
American Airlines, Inc. [Member]
Movement In Contract With Customer, Liability [Roll Forward]
Beginning balance	12,878
Ending balance	$ 14,515
Inactive period before expiration of mileage credits	18 months
American Airlines, Inc. [Member] | Loyalty program liability [Member]
Movement In Contract With Customer, Liability [Roll Forward]
Beginning balance	$ 8,539
Deferral of revenue	1,806
Recognition of revenue	(1,786)
Ending balance	8,559
Deferred revenue, current	$ 3,310	$ 3,267