Employee Benefit Plans - Schedule of Amounts Recognized in Other Comprehensive Income (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	$ 5,356	$ 5,351
Prior service cost (benefit)	131	160
Total accumulated other comprehensive loss (income), pre-tax	5,487	5,511
Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	(452)	(388)
Prior service cost (benefit)	(362)	(600)
Total accumulated other comprehensive loss (income), pre-tax	(814)	(988)
American Airlines, Inc. [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	5,341	5,337
Prior service cost (benefit)	131	159
Total accumulated other comprehensive loss (income), pre-tax	5,472	5,496
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	(452)	(388)
Prior service cost (benefit)	(362)	(600)
Total accumulated other comprehensive loss (income), pre-tax	$ (814)	$ (988)