Special Items, Net (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Restructuring Cost and Reserve [Line Items]
Mark-to-market adjustments on equity investments, net	$ 46	$ 0
Debt refinancing and extinguishment	0	15
Nonoperating special items, net	46	15
American Airlines, Inc.
Restructuring Cost and Reserve [Line Items]
Mark-to-market adjustments on equity investments, net	46	0
Debt refinancing and extinguishment	0	15
Nonoperating special items, net	46	15
Mainline operating special items, net
Restructuring Cost and Reserve [Line Items]
Labor contract expenses	57	0
Severance expenses	13	21
Other operating special items, net	0	(8)
Operating special items, net	70	13
Mainline operating special items, net | American Airlines, Inc.
Restructuring Cost and Reserve [Line Items]
Labor contract expenses	57	0
Severance expenses	13	21
Other operating special items, net	0	(8)
Operating special items, net	$ 70	$ 13