Employee Benefit Plans - Schedule of Amounts Recognized in Other Comprehensive Income (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	$ 5,252	$ 6,700
Prior service cost (benefit)	47	75
Total accumulated other comprehensive loss (income), pre-tax	5,299	6,775
Retiree Medical and  Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	(396)	(358)
Prior service cost (benefit)	(167)	(181)
Total accumulated other comprehensive loss (income), pre-tax	(563)	(539)
American Airlines, Inc. | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	5,241	6,679
Prior service cost (benefit)	46	75
Total accumulated other comprehensive loss (income), pre-tax	5,287	6,754
American Airlines, Inc. | Retiree Medical and  Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	(396)	(358)
Prior service cost (benefit)	(167)	(181)
Total accumulated other comprehensive loss (income), pre-tax	$ (563)	$ (539)