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Goodwill and Purchased Intangible Assets, Net - Future Amortization Expense Related to Purchased Intangible Assets (Detail) - USD ($)
$ in Millions
Jul. 28, 2017
Apr. 28, 2017
Acquired Finite Lived Intangible Assets [Line Items]    
Net Assets $ 124 $ 131
Intangible Assets Subject to Amortization    
Acquired Finite Lived Intangible Assets [Line Items]    
Remainder of 2018 38  
2019 44  
2020 27  
2021 15  
Net Assets $ 124