Employee Benefit Plans - Schedule of Changes in Projected Benefit Obligations (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2012
Reconciliation of benefit obligation:
Plan amendments			$ (313)		$ (1,900)
Pension Benefits
Reconciliation of benefit obligation:
Benefit obligation at beginning of period		$ 19,812	18,358
Service cost		4	2	$ 2
Interest cost		526	615	703
Actuarial (gain) loss		(609)	1,613
Special termination benefits		0	0	0
Plan amendments		0	0
Settlements		(1)	(36)
Benefit payments		(822)	(740)
Benefit obligation at end of period	$ 18,910	18,910	19,812	18,358
Retiree Medical and  Other Postretirement Benefits
Reconciliation of benefit obligation:
Benefit obligation at beginning of period		1,046	824
Service cost		12	8	3
Interest cost		30	30	33
Actuarial (gain) loss		(57)	46
Special termination benefits		139	410	0
Plan amendments		0	(195)
Settlements		0	0
Benefit payments		(72)	(77)
Benefit obligation at end of period	1,098	1,098	1,046	824
American Airlines, Inc.
Reconciliation of benefit obligation:
Plan amendments	(313)				$ (1,900)
American Airlines, Inc. | Pension Benefits
Reconciliation of benefit obligation:
Benefit obligation at beginning of period		19,690	18,246
Service cost		3	2	2
Interest cost		523	611	699
Actuarial (gain) loss		(606)	1,603
Special termination benefits		0	0	0
Plan amendments		0	0
Settlements		(1)	(36)
Benefit payments		(818)	(736)
Benefit obligation at end of period	18,791	18,791	19,690	18,246
American Airlines, Inc. | Retiree Medical and  Other Postretirement Benefits
Reconciliation of benefit obligation:
Benefit obligation at beginning of period		1,046	824
Service cost		12	8	3
Interest cost		30	30	33
Actuarial (gain) loss		(57)	46
Special termination benefits		139	410	0
Plan amendments		0	(195)
Settlements		0	0
Benefit payments		(72)	(77)
Benefit obligation at end of period	$ 1,098	$ 1,098	$ 1,046	$ 824