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Balance Sheet Details - Cash and Cash Equivalents (Detail) - USD ($)
$ in Millions
Apr. 27, 2018
Apr. 28, 2017
Apr. 29, 2016
Apr. 24, 2015
Cash And Cash Equivalents [Abstract]        
Cash $ 2,727 $ 2,275    
Cash equivalents 214 169    
Cash and cash equivalents $ 2,941 $ 2,444 $ 2,868 $ 1,922