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Goodwill and Purchased Intangible Assets, Net - Schedule of Goodwill Activity (Detail) - USD ($)
$ in Millions
12 Months Ended
Apr. 24, 2020
Apr. 26, 2019
Goodwill And Intangible Assets Disclosure [Abstract]    
Beginning balance $ 1,735 $ 1,739
Additions 43 3
Derecognition   (7)
Ending balance $ 1,778 $ 1,735