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Share Based Compensation - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation costs	$ 91	$ 95	$ 88
Common stock withheld or sold related to tax obligations (in shares)	700,000	800,000	800,000
Payment of certain tax withholding obligations associated with employee equity awards	$ 15	$ 25	$ 37
AAG Incentive Award Plan 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for grant (in shares)				40,000,000
American Airlines, Inc.
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation costs	$ 91	$ 95	$ 88
Common stock withheld or sold related to tax obligations (in shares)	700,000	800,000	800,000
Payment of certain tax withholding obligations associated with employee equity awards	$ 15	$ 25	$ 37
American Airlines, Inc. \| AAG Incentive Award Plan 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for grant (in shares)				40,000,000