Employee Benefit Plans - Schedule of Changes in Projected Benefit Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pension Benefits
Reconciliation of benefit obligation:
Benefit obligation at beginning of period	$ 14,410	$ 14,037
Service cost	2	2	$ 3
Interest cost	723	758	556
Actuarial loss (gain)	(741)	507
Plan amendments	0	0
Benefit payments	(913)	(894)
Other	(132)	0
Benefit obligation at end of period	13,349	14,410	14,037
Retiree Medical and  Other Postretirement Benefits
Reconciliation of benefit obligation:
Benefit obligation at beginning of period	1,325	906
Service cost	29	17	16
Interest cost	64	55	30
Actuarial loss (gain)	(58)	92
Plan amendments	55	339
Benefit payments	(107)	(84)
Other	0	0
Benefit obligation at end of period	1,308	1,325	906
American Airlines, Inc. | Pension Benefits
Reconciliation of benefit obligation:
Benefit obligation at beginning of period	14,314	13,948
Service cost	2	2	3
Interest cost	718	753	552
Actuarial loss (gain)	(737)	501
Plan amendments	0	0
Benefit payments	(907)	(890)
Other	(132)	0
Benefit obligation at end of period	13,258	14,314	13,948
American Airlines, Inc. | Retiree Medical and  Other Postretirement Benefits
Reconciliation of benefit obligation:
Benefit obligation at beginning of period	1,325	906
Service cost	29	17	16
Interest cost	64	55	30
Actuarial loss (gain)	(58)	92
Plan amendments	54	339
Benefit payments	(107)	(84)
Other	0	0
Benefit obligation at end of period	$ 1,307	$ 1,325	$ 906