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Supplemental Financial Information - Cash and Cash Equivalents (Detail) - USD ($)
$ in Millions
Apr. 30, 2021
Apr. 24, 2020
Apr. 26, 2019
Apr. 27, 2018
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents $ 4,529 $ 2,658    
Restricted cash 6 8    
Cash, cash equivalents and restricted cash $ 4,535 $ 2,666 $ 2,331 $ 2,947