Goodwill and Purchased Intangible Assets (Schedule Of Purchased Intangible Assets With Finite And Indefinite Lives) (Details) - USD ($) $ in Millions	Jan. 28, 2017	Jul. 30, 2016
Business Acquisition [Line Items]
Gross	$ 4,260	$ 4,916
Accumulated Amortization	(2,311)	(2,637)
Total purchased intangible assets with finite lives, net	1,949	2,279
In-process research and development, with indefinite lives	168	222
Total finite and indefinite lives Intangible assets, Gross	4,428	5,138
Total finite and indefinite lives intangible assets, net	2,117	2,501
TECHNOLOGY
Business Acquisition [Line Items]
Gross	2,900	3,038
Accumulated Amortization	(1,440)	(1,391)
Total purchased intangible assets with finite lives, net	1,460	1,647
CUSTOMER RELATIONSHIPS
Business Acquisition [Line Items]
Gross	1,303	1,793
Accumulated Amortization	(846)	(1,203)
Total purchased intangible assets with finite lives, net	457	590
OTHER
Business Acquisition [Line Items]
Gross	57	85
Accumulated Amortization	(25)	(43)
Total purchased intangible assets with finite lives, net	$ 32	$ 42