Employee Benefit Plans - Schedule of Accumulated Benefit Obligations Exceeding Fair Value of Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 14,037	$ 18,910
Accumulated benefit obligation	14,030	18,899
Fair value of plan assets	11,884	14,691
Retiree Medical and  Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Accumulated postretirement benefit obligation	906	1,098
Fair value of plan assets	133	167
American Airlines, Inc. | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	13,948	18,791
Accumulated benefit obligation	13,941	18,782
Fair value of plan assets	11,821	14,605
American Airlines, Inc. | Retiree Medical and  Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Accumulated postretirement benefit obligation	906	1,098
Fair value of plan assets	$ 133	$ 167