Basis of Presentation and Summary of Significant Accounting Policies - Operating Property and Equipment (Detail) - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Jan. 01, 2025
Property, Plant and Equipment [Line Items]
Depreciation	$ 2.2	$ 2.2	$ 2.3
Aircraft, engines and related rotable parts
Property, Plant and Equipment [Line Items]
Extended estimated useful life (in years)				3 years
Residual value percentage of equipment and properties		10.00%		5.00%
Minimum | Aircraft, engines and related rotable parts
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	20 years
Minimum | Buildings and improvements
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	5 years
Minimum | Furniture, fixtures and other equipment
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	3 years
Minimum | Capitalized software
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	5 years
Maximum | Aircraft, engines and related rotable parts
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	33 years
Maximum | Buildings and improvements
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	30 years
Maximum | Furniture, fixtures and other equipment
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	15 years
Maximum | Capitalized software
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	10 years
American Airlines, Inc.
Property, Plant and Equipment [Line Items]
Depreciation	$ 2.2	$ 2.2	$ 2.2
American Airlines, Inc. | Aircraft, engines and related rotable parts
Property, Plant and Equipment [Line Items]
Extended estimated useful life (in years)				3 years
Residual value percentage of equipment and properties		10.00%		5.00%
American Airlines, Inc. | Minimum | Aircraft, engines and related rotable parts
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	20 years
American Airlines, Inc. | Minimum | Buildings and improvements
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	5 years
American Airlines, Inc. | Minimum | Furniture, fixtures and other equipment
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	3 years
American Airlines, Inc. | Minimum | Capitalized software
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	5 years
American Airlines, Inc. | Maximum | Aircraft, engines and related rotable parts
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	33 years
American Airlines, Inc. | Maximum | Buildings and improvements
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	30 years
American Airlines, Inc. | Maximum | Furniture, fixtures and other equipment
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	15 years
American Airlines, Inc. | Maximum | Capitalized software
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	10 years