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Other Intangible Assets - Estimated Amortization Expense of Existing Intangible Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]    
2016 $ 61  
2017 44  
2018 28  
2019 17  
2020 8  
Thereafter 8  
Net Cost $ 166 $ 193