Employee Benefit Plans - Schedule of Changes in Fair Value of Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Pension Benefits
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of period	$ 12,431	$ 11,884
Actual return on plan assets	568	1,368
Employer contributions	300	73
Benefit payments	(913)	(894)
Other	(132)	0
Fair value of plan assets at end of period	12,254	12,431
Funded status at end of period	(1,095)	(1,979)
Payments of required contributions	285	69
Supplemental contributions by employer	15	4
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	133	133
Actual return on plan assets	9	14
Employer contributions	93	70
Benefit payments	(107)	(84)
Other	0	0
Fair value of plan assets at end of period	128	133
Funded status at end of period	(1,180)	(1,192)
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	12,358	11,821
Actual return on plan assets	561	1,356
Employer contributions	295	71
Benefit payments	(907)	(890)
Other	(132)	0
Fair value of plan assets at end of period	12,175	12,358
Funded status at end of period	(1,083)	(1,956)
Payments of required contributions	280	67
Supplemental contributions by employer	15	4
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	133	133
Actual return on plan assets	9	14
Employer contributions	93	70
Benefit payments	(107)	(84)
Other	0	0
Fair value of plan assets at end of period	128	133
Funded status at end of period	$ (1,179)	$ (1,192)