Employee Benefit Plans - Schedule of Amounts Recognized in Other Comprehensive Income (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	$ 3,566	$ 3,613
Prior service cost (benefit)	0	18
Total accumulated other comprehensive loss (income), pre-tax	3,566	3,631
Retiree Medical and  Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	(383)	(505)
Prior service cost (benefit)	197	(148)
Total accumulated other comprehensive loss (income), pre-tax	(186)	(653)
American Airlines, Inc. | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	3,561	3,609
Prior service cost (benefit)	0	18
Total accumulated other comprehensive loss (income), pre-tax	3,561	3,627
American Airlines, Inc. | Retiree Medical and  Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	(382)	(505)
Prior service cost (benefit)	197	(148)
Total accumulated other comprehensive loss (income), pre-tax	$ (185)	$ (653)