Income Taxes - Additional Disclosures (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Taxes [Line Items]
Income tax provision (benefit)	$ (2,568)	$ 570	$ 472
Income tax expense, effective rate	22.00%
Alternative Minimum Tax Credit Carryforward
Income Taxes [Line Items]
Alternative minimum tax credit carryforwards		170
Federal
Income Taxes [Line Items]
Gross NOL carryforwards	$ 16,500
Operating loss carryforwards, subject to expiration	8,500
Operating loss carryforwards, not subject to expiration	8,000
State
Income Taxes [Line Items]
Operating loss carryforwards, subject to expiration	5,000
American Airlines, Inc.
Income Taxes [Line Items]
Income tax provision (benefit)	$ (2,453)	633	$ 534
Income tax expense, effective rate	22.00%
American Airlines, Inc. | Alternative Minimum Tax Credit Carryforward
Income Taxes [Line Items]
Alternative minimum tax credit carryforwards		$ 226
American Airlines, Inc. | Federal
Income Taxes [Line Items]
Gross NOL carryforwards	$ 16,500
Operating loss carryforwards, subject to expiration	8,900
Operating loss carryforwards, not subject to expiration	7,600
American Airlines, Inc. | State
Income Taxes [Line Items]
Gross NOL carryforwards	$ 5,000