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Other Intangible Assets - Estimated Amortization Expense of Existing Intangible Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 $ 77  
2020 60  
2021 40  
2022 23  
2023 8  
Thereafter 4  
Net Cost $ 212 $ 209