Employee Benefit Plans - Components of Net Periodic Benefit Cost (Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Benefits
Defined benefit plans:
Service cost	$ 3	$ 4	$ 2
Interest cost	556	526	615
Expected return on assets	(1,138)	(1,084)	(1,010)
Special termination benefits	0	0	0
Settlements	0	0	12
Amortization of:
Prior service cost (benefit)	28	28	30
Unrecognized net loss (gain)	156	212	164
Net periodic benefit cost (income)	(395)	(314)	(187)
Retiree Medical and  Other Postretirement Benefits
Defined benefit plans:
Service cost	16	12	8
Interest cost	30	30	30
Expected return on assets	(12)	(12)	(11)
Special termination benefits	0	139	410
Settlements	0	0	0
Amortization of:
Prior service cost (benefit)	(14)	(13)	(135)
Unrecognized net loss (gain)	(30)	(24)	(24)
Net periodic benefit cost (income)	(10)	132	278
American Airlines, Inc. | Pension Benefits
Defined benefit plans:
Service cost	3	3	2
Interest cost	552	523	611
Expected return on assets	(1,133)	(1,078)	(1,005)
Special termination benefits	0	0	0
Settlements	0	0	12
Amortization of:
Prior service cost (benefit)	28	28	29
Unrecognized net loss (gain)	156	211	164
Net periodic benefit cost (income)	(394)	(313)	(187)
American Airlines, Inc. | Retiree Medical and  Other Postretirement Benefits
Defined benefit plans:
Service cost	16	12	8
Interest cost	30	30	30
Expected return on assets	(12)	(12)	(11)
Special termination benefits	0	139	410
Settlements	0		0
Amortization of:
Prior service cost (benefit)	(14)	(13)	(135)
Unrecognized net loss (gain)	(30)	(24)	(24)
Net periodic benefit cost (income)	$ (10)	$ 132	$ 278