Goodwill and Purchased Intangible Assets (Schedule of Purchased Intangible Assets With Finite And Indefinite Lives) (Details) - USD ($) $ in Millions	Jul. 29, 2017	Jul. 30, 2016
Business Acquisition [Line Items]
Gross	$ 4,617	$ 4,916
Accumulated Amortization	(2,189)	(2,637)
Net	2,428	2,279
In-process research and development, with indefinite lives	111	222
Total	4,728	5,138
Total, Net	2,539	2,501
TECHNOLOGY
Business Acquisition [Line Items]
Gross	3,182	3,038
Accumulated Amortization	(1,386)	(1,391)
Net	1,796	1,647
CUSTOMER RELATIONSHIPS
Business Acquisition [Line Items]
Gross	1,353	1,793
Accumulated Amortization	(765)	(1,203)
Net	588	590
OTHER
Business Acquisition [Line Items]
Gross	82	85
Accumulated Amortization	(38)	(43)
Net	$ 44	$ 42