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Segment Information and Major Customers (Additional Information) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Apr. 28, 2018
USD ($)
Apr. 29, 2017
USD ($)
Apr. 28, 2018
USD ($)
segment
Apr. 29, 2017
USD ($)
Jul. 29, 2017
USD ($)
Segment Reporting Information [Line Items]          
Number of geographic segments (segment) | segment     3    
Revenue, total $ 12,463 $ 11,940 $ 36,486 $ 35,872  
International          
Segment Reporting Information [Line Items]          
Cash and cash equivalents and investments 6,900   6,900   $ 67,500
United States          
Segment Reporting Information [Line Items]          
Revenue, total 6,200 $ 6,200 18,800 $ 18,700  
Cash and cash equivalents and investments $ 47,500   $ 47,500   $ 3,000