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Intangible Assets - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets, Net [Abstract]    
Definite-lived intangible assets, amortization expense $ 85 $ 93
Estimated annual amortization expense, 2021 79  
Estimated annual amortization expense, 2022 68  
Estimated annual amortization expense, 2023 55  
Estimated annual amortization expense, 2024 47  
Estimated annual amortization expense, 2025 $ 44