Employee Benefit Plans - Schedule of Amounts Recognized in Other Comprehensive Income (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	$ 2,907	$ 3,128
Prior service cost	0	1
Total accumulated other comprehensive loss (income), pre-tax	2,907	3,129
Retiree Medical and  Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	(395)	(408)
Prior service cost	220	238
Total accumulated other comprehensive loss (income), pre-tax	(175)	(170)
American Airlines, Inc. | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	2,915	3,130
Prior service cost	1	1
Total accumulated other comprehensive loss (income), pre-tax	2,916	3,131
American Airlines, Inc. | Retiree Medical and  Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	(395)	(407)
Prior service cost	221	238
Total accumulated other comprehensive loss (income), pre-tax	$ (174)	$ (169)