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Segment Geographic and Significant Customer Information - Schedule of Cash, Cash Equivalents and Short-Term Investments (Detail) - USD ($)
$ in Millions
Jan. 27, 2017
Apr. 29, 2016
Segment Reporting Information [Line Items]    
Cash, cash equivalents and short-term investments $ 4,639 $ 5,303
U.S.    
Segment Reporting Information [Line Items]    
Cash, cash equivalents and short-term investments 531 513
International    
Segment Reporting Information [Line Items]    
Cash, cash equivalents and short-term investments $ 4,108 $ 4,790