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Goodwill and Purchased Intangible Assets, Net - Future Amortization Expense Related to Purchased Intangible Assets (Detail) - USD ($)
$ in Millions
Apr. 28, 2017
Apr. 29, 2016
Acquired Finite Lived Intangible Assets [Line Items]    
Net Assets $ 131 $ 180
Intangible Assets Subject to Amortization    
Acquired Finite Lived Intangible Assets [Line Items]    
2018 49  
2019 42  
2020 25  
2021 15  
Net Assets $ 131 $ 161