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Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Future Amortization Expense (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
2018 $ 41  
2019 41  
2020 41  
2021 41  
2022 41  
2023 and thereafter 115  
Total 320 $ 364
American Airlines, Inc. [Member]    
Finite-Lived Intangible Assets [Line Items]    
2018 41  
2019 41  
2020 41  
2021 41  
2022 41  
2023 and thereafter 115  
Total $ 320 $ 364