Segment Information and Major Customers (Summary of Reportable Segments) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Apr. 27, 2019	Apr. 28, 2018	Apr. 27, 2019	Apr. 28, 2018
Segment Reporting Information [Line Items]
Revenue, total	$ 12,958	$ 12,463	$ 38,476	$ 36,486
Gross margin	8,173	7,759	24,092	22,684
Operating Segments | Americas
Segment Reporting Information [Line Items]
Revenue, total	7,695	7,161	22,798	21,515
Gross margin	5,046	4,614	14,911	13,950
Operating Segments | EMEA
Segment Reporting Information [Line Items]
Revenue, total	3,356	3,281	9,803	9,252
Gross margin	2,166	2,109	6,307	5,925
Operating Segments | APJC
Segment Reporting Information [Line Items]
Revenue, total	1,907	2,021	5,875	5,719
Gross margin	1,158	1,247	3,467	3,506
Segment Reconciling Items
Segment Reporting Information [Line Items]
Gross margin	8,370	7,970	24,686	23,381
Intersegment Eliminations
Segment Reporting Information [Line Items]
Gross margin	$ (197)	$ (211)	$ (594)	$ (697)