Basis of Presentation and Summary of Significant Accounting Policies - Significant Categories of Reported Operating Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Revenue from External Customer [Line Items]
Total operating revenues	$ 54,633	$ 54,211	$ 52,788
Passenger
Revenue from External Customer [Line Items]
Total operating revenues	49,643	49,586	48,512
Passenger travel
Revenue from External Customer [Line Items]
Total operating revenues	45,607	45,743	44,914
Loyalty revenue - travel
Revenue from External Customer [Line Items]
Total operating revenues	4,036	3,843	3,598
Cargo
Revenue from External Customer [Line Items]
Total operating revenues	839	804	812
Other
Revenue from External Customer [Line Items]
Total operating revenues	4,151	3,821	3,464
Loyalty revenue - marketing services
Revenue from External Customer [Line Items]
Total operating revenues	3,511	3,257	2,929
Other revenue
Revenue from External Customer [Line Items]
Total operating revenues	640	564	535
American Airlines, Inc.
Revenue from External Customer [Line Items]
Total operating revenues	54,626	54,204	52,784
American Airlines, Inc. | Passenger
Revenue from External Customer [Line Items]
Total operating revenues	49,643	49,586	48,512
American Airlines, Inc. | Passenger travel
Revenue from External Customer [Line Items]
Total operating revenues	45,607	45,743	44,914
American Airlines, Inc. | Loyalty revenue - travel
Revenue from External Customer [Line Items]
Total operating revenues	4,036	3,843	3,598
American Airlines, Inc. | Cargo
Revenue from External Customer [Line Items]
Total operating revenues	839	804	812
American Airlines, Inc. | Other
Revenue from External Customer [Line Items]
Total operating revenues	4,144	3,814	3,460
American Airlines, Inc. | Loyalty revenue - marketing services
Revenue from External Customer [Line Items]
Total operating revenues	3,511	3,257	2,929
American Airlines, Inc. | Other revenue
Revenue from External Customer [Line Items]
Total operating revenues	$ 633	$ 557	$ 531