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Segment Information and Major Customers (Summary Of Reportable Segments) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jan. 23, 2016
Jan. 24, 2015
Jan. 23, 2016
Jan. 24, 2015
Segment Reporting Information [Line Items]        
Revenue, total $ 11,927 $ 11,936 $ 24,609 $ 24,181
Gross margin 7,432 7,090 15,264 14,423
Unallocated corporate items        
Segment Reporting Information [Line Items]        
Gross margin (174) (278) (352) (695)
Americas        
Segment Reporting Information [Line Items]        
Revenue, total 6,912 7,101 14,711 14,602
Gross margin 4,412 4,406 9,362 9,216
EMEA        
Segment Reporting Information [Line Items]        
Revenue, total 3,088 3,091 6,175 6,093
Gross margin 2,005 1,910 3,987 3,825
APJC        
Segment Reporting Information [Line Items]        
Revenue, total 1,927 1,744 3,723 3,486
Gross margin 1,189 1,052 2,267 2,077
Consolidated by Segment        
Segment Reporting Information [Line Items]        
Revenue, total 11,927 11,936 24,609 24,181
Total by Segment        
Segment Reporting Information [Line Items]        
Gross margin $ 7,606 $ 7,368 $ 15,616 $ 15,118