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Segment Information And Major Customers - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended
Jan. 25, 2014
Jan. 26, 2013
Jan. 25, 2014
Jan. 26, 2013
Jul. 27, 2013
Segment Reporting Information [Line Items]          
Number of geographic segments     three    
Total revenue $ 11,155,000,000 $ 12,098,000,000 $ 23,240,000,000 $ 23,974,000,000  
United States
         
Segment Reporting Information [Line Items]          
Total revenue 5,600,000,000 6,100,000,000 12,000,000,000 12,200,000,000  
Cash, Cash Equivalents, and Investments 3,300,000,000   3,300,000,000   10,200,000,000
International
         
Segment Reporting Information [Line Items]          
Cash, Cash Equivalents, and Investments $ 43,800,000,000   $ 43,800,000,000   $ 40,400,000,000