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Supplemental Financial Information - Cash, Cash Equivalents and Restricted Cash (Detail) - USD ($)
$ in Millions
Oct. 26, 2018
Apr. 27, 2018
Oct. 27, 2017
Apr. 28, 2017
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents [Abstract]        
Cash $ 2,251 $ 2,727    
Cash equivalents 108 214    
Cash and cash equivalents 2,359 2,941    
Short-term restricted cash 5 5    
Long-term restricted cash 1 1    
Restricted cash 6 6    
Cash, cash equivalents and restricted cash $ 2,365 $ 2,947 $ 3,536 $ 2,450