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Other Intangible Assets - Estimated Amortization Expense of Existing Intangible Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 $ 75  
2019 58  
2020 41  
2021 22  
2022 10  
Thereafter 3  
Net Cost $ 209 $ 195