Employee Benefit Plans - Schedule of Changes in Projected Benefit Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Pension Benefits [Member]
Reconciliation of benefit obligation:
Benefit obligation at beginning of period	$ 16,378	$ 18,275
Service cost	2	3	$ 2
Interest cost	703	674	721
Actuarial (gain) loss	1,965	(1,910)
Settlements	(2)	(4)
Benefit payments	(689)	(662)
Other	1	2
Benefit obligation at end of period	18,358	16,378	18,275
Retiree Medical And Other Postretirement Benefits [Member]
Reconciliation of benefit obligation:
Benefit obligation at beginning of period	837	1,011
Service cost	3	5	4
Interest cost	33	35	39
Actuarial (gain) loss	20	(133)
Settlements	0	0
Benefit payments	(74)	(81)
Other	5	0
Benefit obligation at end of period	824	837	1,011
American Airlines, Inc. [Member] | Pension Benefits [Member]
Reconciliation of benefit obligation:
Benefit obligation at beginning of period	16,282	18,175
Service cost	2	2	2
Interest cost	699	670	717
Actuarial (gain) loss	1,951	(1,905)
Settlements	(2)	(4)
Benefit payments	(686)	(659)
Other	0	3
Benefit obligation at end of period	18,246	16,282	18,175
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member]
Reconciliation of benefit obligation:
Benefit obligation at beginning of period	837	1,010
Service cost	3	5	4
Interest cost	33	35	39
Actuarial (gain) loss	20	(132)
Settlements	0	0
Benefit payments	(74)	(81)
Other	5	0
Benefit obligation at end of period	$ 824	$ 837	$ 1,010