Employee Benefit Plans - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Jan. 31, 2021	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) for plan amendment		$ (313)				$ (1,900)
Average remaining life expectancy of retirees		13 years 3 months 18 days
Weighted average expected rate of return on plan assets			8.00%
Estimated future employer contributions for next fiscal year		$ 697	$ 697
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) for plan amendment			$ 0	$ 0
Weighted average expected rate of return on plan assets			8.00%	8.00%	8.00%
Expected current year employer contributions deferred under CARES Act		130	$ 130
Employer contributions			$ 9	$ 1,230
Pension Benefits | Subsequent Event
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 241
American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) for plan amendment		$ (313)				$ (1,900)
Average remaining life expectancy of retirees		13 years 3 months 18 days
Weighted average expected rate of return on plan assets			8.00%
Estimated future employer contributions for next fiscal year		$ 694	$ 694
American Airlines, Inc. | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) for plan amendment			$ 0	$ 0
Weighted average expected rate of return on plan assets			8.00%	8.00%	8.00%
Expected current year employer contributions deferred under CARES Act		$ 130	$ 130
Employer contributions			$ 6	$ 1,224