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Balance Sheet Details - Cash and Cash Equivalents (Detail) - USD ($)
$ in Millions
Jul. 29, 2016
Apr. 29, 2016
Jul. 31, 2015
Apr. 24, 2015
Cash And Cash Equivalents [Abstract]        
Cash $ 2,121 $ 2,714    
Cash equivalents 173 154    
Cash and cash equivalents $ 2,294 $ 2,868 $ 2,324 $ 1,922