Segment Information and Major Customers (Summary Of Reportable Segments) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 25, 2015	Apr. 26, 2014	Apr. 25, 2015	Apr. 26, 2014
Segment Reporting Information [Line Items]
Revenue	$ 12,137	$ 11,545	$ 36,318	$ 34,785
Gross margin	7,525	7,006	21,948	20,364
Unallocated corporate items
Segment Reporting Information [Line Items]
Gross margin	(64)	(233)	(759)	(1,332)
Americas
Segment Reporting Information [Line Items]
Revenue	7,252	6,689	21,854	20,465
Gross margin	4,560	4,196	13,776	12,823
EMEA
Segment Reporting Information [Line Items]
Revenue	3,119	3,068	9,212	8,897
Gross margin	1,949	1,967	5,774	5,725
APJC
Segment Reporting Information [Line Items]
Revenue	1,766	1,788	5,252	5,423
Gross margin	1,080	1,076	3,157	3,148
Segment total
Segment Reporting Information [Line Items]
Gross margin	$ 7,589	$ 7,239	$ 22,707	$ 21,696