Employee Benefit Plans - Schedule of Amounts Recognized in Consolidated Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Noncurrent liability	$ 6,052	$ 6,907
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Current liability	5	7
Noncurrent liability	5,456	6,318
Total liabilities	5,461	6,325
Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Current liability	24	23
Noncurrent liability	596	589
Total liabilities	620	612
American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Noncurrent liability	6,008	6,863
American Airlines, Inc. [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Current liability	5	7
Noncurrent liability	5,412	6,274
Total liabilities	5,417	6,281
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Current liability	24	23
Noncurrent liability	596	589
Total liabilities	$ 620	$ 612