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Segment Information and Major Customers (Additional Information) (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jan. 28, 2017
USD ($)
Jan. 23, 2016
USD ($)
Jan. 28, 2017
USD ($)
segment
Jan. 23, 2016
USD ($)
Jul. 30, 2016
USD ($)
Segment Reporting Information [Line Items]          
Number of geographic segments | segment     3    
Revenue, total $ 11,580 $ 11,927 $ 23,932 $ 24,609  
United States          
Segment Reporting Information [Line Items]          
Revenue, total 5,900 $ 6,000 12,500 $ 12,900  
Cash and cash equivalents and investments 9,600   9,600   $ 5,900
International          
Segment Reporting Information [Line Items]          
Cash and cash equivalents and investments $ 62,300   $ 62,300   $ 59,800