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Balance Sheet Details - Cash and Cash Equivalents (Detail) - USD ($)
$ in Millions
Oct. 30, 2015
Apr. 24, 2015
Oct. 24, 2014
Apr. 25, 2014
Cash And Cash Equivalents [Abstract]        
Cash $ 2,075 $ 1,666    
Cash equivalents 123 256    
Cash and cash equivalents $ 2,198 $ 1,922 $ 2,905 $ 2,291