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Goodwill and Purchased Intangible Assets, Net - Schedule of Goodwill Activity (Detail)
$ in Millions
3 Months Ended
Jul. 26, 2019
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
Balance as of April 26, 2019 $ 1,735
Additions 35
Balance as of July 26, 2019 $ 1,770