Employee Benefit Plans - Schedule of Changes in Projected Benefit Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Pension Benefits
Reconciliation of benefit obligation:
Benefit obligation at beginning of period	$ 13,349	$ 14,410
Service cost	3	2	$ 2
Interest cost	730	723	758
Actuarial loss (gain)	168	(741)
Plan amendments	0	0
Benefit payments	(919)	(913)
Other	0	(132)
Benefit obligation at end of period	13,331	13,349	14,410
Retiree Medical and  Other Postretirement Benefits
Reconciliation of benefit obligation:
Benefit obligation at beginning of period	1,308	1,325
Service cost	23	29	17
Interest cost	69	64	55
Actuarial loss (gain)	(11)	(58)
Plan amendments	0	55
Benefit payments	(130)	(107)
Other	0	0
Benefit obligation at end of period	1,259	1,308	1,325
American Airlines, Inc. | Pension Benefits
Reconciliation of benefit obligation:
Benefit obligation at beginning of period	13,258	14,314
Service cost	2	2	2
Interest cost	725	718	753
Actuarial loss (gain)	169	(737)
Plan amendments	0	0
Benefit payments	(914)	(907)
Other	0	(132)
Benefit obligation at end of period	13,240	13,258	14,314
American Airlines, Inc. | Retiree Medical and  Other Postretirement Benefits
Reconciliation of benefit obligation:
Benefit obligation at beginning of period	1,307	1,325
Service cost	23	29	17
Interest cost	69	64	55
Actuarial loss (gain)	(11)	(58)
Plan amendments	0	54
Benefit payments	(130)	(107)
Other	0	0
Benefit obligation at end of period	$ 1,258	$ 1,307	$ 1,325