Employee Benefit Plans - Components of Net Periodic Benefit Cost (Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pension Benefits
Defined benefit plans:
Service cost	$ 2	$ 2	$ 3
Interest cost	723	758	556
Expected return on assets	(978)	(918)	(1,138)
Amortization of:
Prior service cost (benefit)	0	18	28
Unrecognized net loss (gain)	105	106	156
Net periodic benefit cost (income)	(148)	(34)	(395)
Retiree Medical and  Other Postretirement Benefits
Defined benefit plans:
Service cost	29	17	16
Interest cost	64	55	30
Expected return on assets	(10)	(11)	(12)
Amortization of:
Prior service cost (benefit)	14	(6)	(14)
Unrecognized net loss (gain)	(31)	(34)	(30)
Net periodic benefit cost (income)	66	21	(10)
American Airlines, Inc. | Pension Benefits
Defined benefit plans:
Service cost	2	2	3
Interest cost	718	753	552
Expected return on assets	(973)	(914)	(1,133)
Amortization of:
Prior service cost (benefit)	0	18	28
Unrecognized net loss (gain)	105	106	156
Net periodic benefit cost (income)	(148)	(35)	(394)
American Airlines, Inc. | Retiree Medical and  Other Postretirement Benefits
Defined benefit plans:
Service cost	29	17	16
Interest cost	64	55	30
Expected return on assets	(10)	(11)	(12)
Amortization of:
Prior service cost (benefit)	14	(6)	(14)
Unrecognized net loss (gain)	(31)	(34)	(30)
Net periodic benefit cost (income)	$ 66	$ 21	$ (10)