Revenue Recognition - Significant Contract Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Contract balances, liability	$ 14,515	$ 12,878
Loyalty program liability [Member]
Disaggregation of Revenue [Line Items]
Contract balances, liability	8,559	8,539
Air traffic liability [Member]
Disaggregation of Revenue [Line Items]
Contract balances, liability	5,956	4,339
American Airlines, Inc. [Member]
Disaggregation of Revenue [Line Items]
Contract balances, liability	14,515	12,878
American Airlines, Inc. [Member] | Loyalty program liability [Member]
Disaggregation of Revenue [Line Items]
Contract balances, liability	8,559	8,539
American Airlines, Inc. [Member] | Air traffic liability [Member]
Disaggregation of Revenue [Line Items]
Contract balances, liability	$ 5,956	$ 4,339