Revenue Recognition - Significant Contract Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Contract balances, liability	$ 14,081	$ 13,423
Loyalty program liability [Member]
Disaggregation of Revenue [Line Items]
Contract balances, liability	8,962	8,615
Air traffic liability [Member]
Disaggregation of Revenue [Line Items]
Contract balances, liability	5,119	4,808
American Airlines, Inc. [Member]
Disaggregation of Revenue [Line Items]
Contract balances, liability	14,081	13,423
American Airlines, Inc. [Member] | Loyalty program liability [Member]
Disaggregation of Revenue [Line Items]
Contract balances, liability	8,962	8,615
American Airlines, Inc. [Member] | Air traffic liability [Member]
Disaggregation of Revenue [Line Items]
Contract balances, liability	$ 5,119	$ 4,808