Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Tax Credit Carryforward [Line Items]
Deferred tax assets, valuation allowance	$ 34		$ 34
Income tax benefit	(10)	$ (592)	(333)	$ (1,241)
Federal
Tax Credit Carryforward [Line Items]
NOL carryforwards					$ 16,500
NOL carryforward subject to expiration					8,500
NOL carryforward not subject to expiration					8,000
State
Tax Credit Carryforward [Line Items]
NOL carryforwards					5,000
American Airlines, Inc.
Tax Credit Carryforward [Line Items]
Deferred tax assets, valuation allowance	24		24
Income tax benefit	$ (1)	$ (564)	$ (315)	$ (1,191)
American Airlines, Inc. | Federal
Tax Credit Carryforward [Line Items]
NOL carryforwards					16,500
NOL carryforward subject to expiration					8,900
NOL carryforward not subject to expiration					7,600
American Airlines, Inc. | State
Tax Credit Carryforward [Line Items]
NOL carryforwards					$ 5,000