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Purchased Intangible Assets, Net - Future Amortization Expense Related to Purchased Intangible Assets (Detail) - USD ($)
$ in Millions
Jan. 29, 2016
Apr. 24, 2015
Goodwill And Intangible Assets Disclosure [Abstract]    
Remainder of 2016 $ 13  
2017 10  
2018 6  
2019 5  
2020 3  
Net Assets $ 37 $ 90