Employee Benefit Plans - Schedule of Amounts Recognized in Other Comprehensive Income (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	$ 3,128	$ 3,566
Prior service cost	1	0
Total accumulated other comprehensive loss (income), pre-tax	3,129	3,566
Retiree Medical and  Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	(408)	(383)
Prior service cost	238	197
Total accumulated other comprehensive loss (income), pre-tax	(170)	(186)
American Airlines, Inc. | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	3,130	3,561
Prior service cost	1	0
Total accumulated other comprehensive loss (income), pre-tax	3,131	3,561
American Airlines, Inc. | Retiree Medical and  Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	(407)	(382)
Prior service cost	238	197
Total accumulated other comprehensive loss (income), pre-tax	$ (169)	$ (185)