Basis of Presentation and Summary of Significant Accounting Policies - Definite-Lived Intangible Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization	$ (786)	$ (745)
Total	156	197
American Airlines, Inc.
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization	(786)	(745)
Total	156	197
Domestic airport slots
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	$ 365	365
Useful life of intangible assets	25 years
Domestic airport slots | American Airlines, Inc.
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	$ 365	365
Useful life of intangible assets	25 years
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	$ 300	300
Useful life of intangible assets	9 years
Customer relationships | American Airlines, Inc.
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	$ 300	300
Useful life of intangible assets	9 years
Marketing agreements
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	$ 105	105
Useful life of intangible assets	30 years
Marketing agreements | American Airlines, Inc.
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	$ 105	105
Useful life of intangible assets	30 years
Tradenames
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	$ 35	35
Tradenames | American Airlines, Inc.
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	35	35
Airport gate leasehold rights
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	$ 137	137
Useful life of intangible assets	25 years
Airport gate leasehold rights | American Airlines, Inc.
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	$ 137	$ 137
Useful life of intangible assets	25 years