Special Items, Net (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Restructuring Cost and Reserve [Line Items]
Mainline operating special items, net	$ 17	$ 7	$ 37	$ 125
Mark-to-market adjustments on equity investments, net	14	(4)	104	11
Impairment of equity investments	78	0	78	0
Debt refinancing and extinguishment	0	0	63	19
Other nonoperating special items, net	3	0	14	(2)
Nonoperating special items, net	95	(4)	259	28
American Airlines, Inc.
Restructuring Cost and Reserve [Line Items]
Mark-to-market adjustments on equity investments, net	14	(4)	104	11
Impairment of equity investments	78	0	78	0
Debt refinancing and extinguishment	0	0	63	19
Other nonoperating special items, net	3	0	14	(2)
Nonoperating special items, net	95	(4)	259	28
Mainline operating special items, net
Restructuring Cost and Reserve [Line Items]
Litigation reserve adjustments	6	0	18	77
Labor contract expenses	0	0	2	31
Other operating special items, net	3	7	9	17
Mainline operating special items, net	9	7	29	125
Mainline operating special items, net \| American Airlines, Inc.
Restructuring Cost and Reserve [Line Items]
Litigation reserve adjustments	6	0	18	77
Labor contract expenses	0	0	2	31
Other operating special items, net	3	7	9	17
Mainline operating special items, net	9	7	29	125
Regional operating special items, net
Restructuring Cost and Reserve [Line Items]
Mainline operating special items, net	$ 8	$ 0	$ 8	$ 0

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