Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Tax Credit Carryforward [Line Items]
Deferred tax assets, valuation allowance	$ 34		$ 34
Income tax provision (benefit)	37	$ (696)	(296)	$ (1,937)
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 provision (benefit)	$ 68	$ (660)	$ (247)	$ (1,852)
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