Employee Benefit Plans - Schedule of Changes in Projected Benefit Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Benefits
Reconciliation of benefit obligation:
Benefit obligation at beginning of period	$ 18,910	$ 19,812
Service cost	3	4	$ 2
Interest cost	556	526	615
Actuarial (gain) loss	(4,563)	(609)
Special termination benefits	0	0
Other	0	(1)
Benefit payments	(869)	(822)
Benefit obligation at end of period	14,037	18,910	19,812
Retiree Medical and  Other Postretirement Benefits
Reconciliation of benefit obligation:
Benefit obligation at beginning of period	1,098	1,046
Service cost	16	12	8
Interest cost	30	30	30
Actuarial (gain) loss	(167)	(57)
Special termination benefits	0	139
Other	3	0
Benefit payments	(74)	(72)
Benefit obligation at end of period	906	1,098	1,046
American Airlines, Inc. | Pension Benefits
Reconciliation of benefit obligation:
Benefit obligation at beginning of period	18,791	19,690
Service cost	3	3	2
Interest cost	552	523	611
Actuarial (gain) loss	(4,534)	(606)
Special termination benefits	0	0
Other	0	(1)
Benefit payments	(864)	(818)
Benefit obligation at end of period	13,948	18,791	19,690
American Airlines, Inc. | Retiree Medical and  Other Postretirement Benefits
Reconciliation of benefit obligation:
Benefit obligation at beginning of period	1,098	1,046
Service cost	16	12	8
Interest cost	30	30	30
Actuarial (gain) loss	(167)	(57)
Special termination benefits	0	139
Other	3	0
Benefit payments	(74)	(72)
Benefit obligation at end of period	$ 906	$ 1,098	$ 1,046