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Balance Sheet Details - Cash and Cash Equivalents (Detail) - USD ($)
$ in Millions
Jan. 27, 2017
Apr. 29, 2016
Jan. 29, 2016
Apr. 24, 2015
Cash And Cash Equivalents [Abstract]        
Cash $ 1,989 $ 2,714    
Cash equivalents 224 154    
Cash and cash equivalents $ 2,213 $ 2,868 $ 2,495 $ 1,922