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Segment Information And Major Customers - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Apr. 26, 2014
Apr. 27, 2013
Apr. 26, 2014
Apr. 27, 2013
Jul. 27, 2013
Segment Reporting Information [Line Items]          
Number of geographic segments     three    
Total revenue $ 11,545,000,000 $ 12,216,000,000 $ 34,785,000,000 $ 36,190,000,000  
United States
         
Segment Reporting Information [Line Items]          
Total revenue 5,900,000,000 6,100,000,000 17,900,000,000 18,300,000,000  
Cash, Cash Equivalents, and Investments 4,600,000,000   4,600,000,000   10,200,000,000
International
         
Segment Reporting Information [Line Items]          
Cash, Cash Equivalents, and Investments $ 45,900,000,000   $ 45,900,000,000   $ 40,400,000,000