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Goodwill and Purchased Intangible Assets, Net - Future Amortization Expense Related to Purchased Intangible Assets (Detail) - USD ($)
$ in Millions
Jan. 24, 2020
Apr. 26, 2019
Acquired Finite Lived Intangible Assets [Line Items]    
Net Assets $ 43 $ 47
Intangible Assets Subject to Amortization    
Acquired Finite Lived Intangible Assets [Line Items]    
Remainder of 2020 8  
2021 25  
2022 9  
2023 1  
Net Assets $ 43