Special Items, Net (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Restructuring Cost and Reserve [Line Items]
Nonoperating special items, net	$ 15	$ 3
American Airlines, Inc.
Restructuring Cost and Reserve [Line Items]
Nonoperating special items, net	15	3
Mainline
Restructuring Cost and Reserve [Line Items]
Severance expenses	21	0
Fleet impairment	0	149
Other operating special items, net	(8)	8
Operating special items, net	13	157
Mainline | American Airlines, Inc.
Restructuring Cost and Reserve [Line Items]
Severance expenses	21	0
Fleet impairment	0	149
Other operating special items, net	(8)	8
Operating special items, net	$ 13	$ 157