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Segment Information and Major Customers - Summary of Reportable Segments (Details) - USD ($)
$ in Millions
 12 Months Ended
Jul. 31, 2021
Jul. 25, 2020
Jul. 27, 2019
Segment Reporting Information [Line Items]      
Total revenue $ 49,818 $ 49,301 $ 51,904
Gross margin 31,894 31,683 32,666
Operating Segments      
Segment Reporting Information [Line Items]      
Gross margin 32,914 32,538 33,479
Operating Segments | Americas      
Segment Reporting Information [Line Items]      
Total revenue 29,161 29,291 30,927
Gross margin 19,499 19,547 20,338
Operating Segments | EMEA      
Segment Reporting Information [Line Items]      
Total revenue 12,951 12,659 13,100
Gross margin 8,466 8,304 8,457
Operating Segments | APJC      
Segment Reporting Information [Line Items]      
Total revenue 7,706 7,352 7,877
Gross margin 4,949 4,688 4,683
Unallocated corporate items      
Segment Reporting Information [Line Items]      
Gross margin $ (1,020) $ (855) $ (813)