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Goodwill and Purchased Intangible Assets, Net - Schedule of Goodwill Activity (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 17, 2018
Jan. 25, 2019
Goodwill And Intangible Assets Disclosure [Abstract]    
Balance as of April 27, 2018   $ 1,739
Additions $ 3 3
Balance as of January 25, 2019   $ 1,742