Employee Benefit Plans - Schedule of Amounts Recognized in Consolidated Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Noncurrent liability	$ 5,053	$ 7,069
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Current liability	7	7
Noncurrent liability	4,212	6,248
Total liabilities	4,219	6,255
Retiree Medical and  Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Current liability	90	55
Noncurrent liability	841	821
Total liabilities	931	876
American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Noncurrent liability	5,020	7,027
American Airlines, Inc. | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Current liability	7	7
Noncurrent liability	4,179	6,206
Total liabilities	4,186	6,213
American Airlines, Inc. | Retiree Medical and  Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Current liability	90	55
Noncurrent liability	841	821
Total liabilities	$ 931	$ 876