Employee Benefit Plans - Schedule of Amounts Recognized in Other Comprehensive Income (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	$ 5,680	$ 5,356
Prior service cost (benefit)	104	131
Total accumulated other comprehensive loss (income), pre-tax	5,784	5,487
Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	(426)	(452)
Prior service cost (benefit)	(120)	(362)
Total accumulated other comprehensive loss (income), pre-tax	(546)	(814)
American Airlines, Inc. [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	5,662	5,341
Prior service cost (benefit)	102	131
Total accumulated other comprehensive loss (income), pre-tax	5,764	5,472
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	(426)	(452)
Prior service cost (benefit)	(120)	(362)
Total accumulated other comprehensive loss (income), pre-tax	$ (546)	$ (814)