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Other Intangible Assets - Estimated Amortization Expense of Existing Intangible Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]    
2020 $ 81  
2021 62  
2022 45  
2023 27  
2024 17  
Thereafter 67  
Net Cost $ 299 $ 212