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Basis of Presentation and Summary of Significant Accounting Policies - Definite-Lived Intangible Assets Amortization Expense (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]    
2021 $ 41  
2022 41  
2023 7  
2024 7  
2025 7  
2026 and thereafter 94  
Total 197 $ 238
American Airlines, Inc.    
Finite-Lived Intangible Assets [Line Items]    
2021 41  
2022 41  
2023 7  
2024 7  
2025 7  
2026 and thereafter 94  
Total $ 197 $ 238