Employee Benefit Plans - Components of Net Periodic Benefit Cost (Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Pension Benefits
Defined benefit plans:
Service cost	$ 3	$ 2	$ 2
Interest cost	730	723	758
Expected return on assets	(929)	(978)	(918)
Amortization of:
Prior service cost (benefit)	1	0	18
Unrecognized net loss (gain)	91	105	106
Net periodic benefit cost (income)	(104)	(148)	(34)
Retiree Medical and  Other Postretirement Benefits
Defined benefit plans:
Service cost	23	29	17
Interest cost	69	64	55
Expected return on assets	(9)	(10)	(11)
Amortization of:
Prior service cost (benefit)	17	14	(6)
Unrecognized net loss (gain)	(27)	(31)	(34)
Net periodic benefit cost (income)	73	66	21
American Airlines, Inc. | Pension Benefits
Defined benefit plans:
Service cost	2	2	2
Interest cost	725	718	753
Expected return on assets	(923)	(973)	(914)
Amortization of:
Prior service cost (benefit)	0	0	18
Unrecognized net loss (gain)	91	105	106
Net periodic benefit cost (income)	(105)	(148)	(35)
American Airlines, Inc. | Retiree Medical and  Other Postretirement Benefits
Defined benefit plans:
Service cost	23	29	17
Interest cost	69	64	55
Expected return on assets	(9)	(10)	(11)
Amortization of:
Prior service cost (benefit)	18	14	(6)
Unrecognized net loss (gain)	(27)	(31)	(34)
Net periodic benefit cost (income)	$ 74	$ 66	$ 21