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Goodwill and Intangibles - Schedule of Estimated Future Amortization Expense for Intangible Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract]    
2021 $ 1  
2022 1  
2023 1  
2024 1  
2025 1  
Thereafter 40  
Intangible assets $ 45 $ 46