Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Tax Credit Carryforward [Line Items]
Deferred tax assets, valuation allowance	$ 34
Income tax benefit	(323)	$ (649)
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
Income tax benefit	$ (314)	$ (628)
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