Basis of Presentation and Summary of Significant Accounting Policies - Significant Categories of Reported Operating Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue from External Customer [Line Items]
Total operating revenues	$ 52,788	$ 48,971	$ 29,882
Passenger
Revenue from External Customer [Line Items]
Total operating revenues	48,512	44,568	26,063
Passenger travel
Revenue from External Customer [Line Items]
Total operating revenues	44,914	41,425	23,896
Loyalty revenue - travel
Revenue from External Customer [Line Items]
Total operating revenues	3,598	3,143	2,167
Cargo
Revenue from External Customer [Line Items]
Total operating revenues	812	1,233	1,314
Other
Revenue from External Customer [Line Items]
Total operating revenues	3,464	3,170	2,505
Loyalty revenue - marketing services
Revenue from External Customer [Line Items]
Total operating revenues	2,929	2,657	2,166
Other revenue
Revenue from External Customer [Line Items]
Total operating revenues	535	513	339
American Airlines, Inc.
Revenue from External Customer [Line Items]
Total operating revenues	52,784	48,965	29,880
American Airlines, Inc. | Passenger
Revenue from External Customer [Line Items]
Total operating revenues	48,512	44,568	26,063
American Airlines, Inc. | Passenger travel
Revenue from External Customer [Line Items]
Total operating revenues	44,914	41,425	23,896
American Airlines, Inc. | Loyalty revenue - travel
Revenue from External Customer [Line Items]
Total operating revenues	3,598	3,143	2,167
American Airlines, Inc. | Cargo
Revenue from External Customer [Line Items]
Total operating revenues	812	1,233	1,314
American Airlines, Inc. | Other
Revenue from External Customer [Line Items]
Total operating revenues	3,460	3,164	2,503
American Airlines, Inc. | Loyalty revenue - marketing services
Revenue from External Customer [Line Items]
Total operating revenues	2,929	2,657	2,166
American Airlines, Inc. | Other revenue
Revenue from External Customer [Line Items]
Total operating revenues	$ 531	$ 507	$ 337