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Goodwill and Intangible Assets - Total Future Amortization Expense for Finite-lived Intangible Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract]    
2021 $ 51  
2022 50  
2023 44  
2024 29  
2025 29  
Thereafter 95  
Finite-lived intangible assets, Net Carrying Amount $ 298 $ 334