Employee Benefit Plans - Schedule of Changes in Fair Value of Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Pension Benefits
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of period	$ 12,254	$ 12,431
Actual return on plan assets	1,229	568
Employer contributions	228	300
Benefit payments	(919)	(913)
Other	0	(132)
Fair value of plan assets at end of period	12,792	12,254
Funded status at end of period	(539)	(1,095)
Payments of required contributions	224	285
Retiree Medical and  Other Postretirement Benefits
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of period	128	133
Actual return on plan assets	15	9
Employer contributions	105	93
Benefit payments	(130)	(107)
Other	0	0
Fair value of plan assets at end of period	118	128
Funded status at end of period	(1,141)	(1,180)
American Airlines, Inc. | Pension Benefits
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of period	12,175	12,358
Actual return on plan assets	1,216	561
Employer contributions	225	295
Benefit payments	(914)	(907)
Other	0	(132)
Fair value of plan assets at end of period	12,702	12,175
Funded status at end of period	(538)	(1,083)
Payments of required contributions	221	280
American Airlines, Inc. | Retiree Medical and  Other Postretirement Benefits
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of period	128	133
Actual return on plan assets	15	9
Employer contributions	105	93
Benefit payments	(130)	(107)
Other	0	0
Fair value of plan assets at end of period	118	128
Funded status at end of period	$ (1,140)	$ (1,179)