Goodwill and Purchased Intangible Assets (Schedule Of Purchased Intangible Assets With Finite And Indefinite Lives) (Details) - USD ($) $ in Millions	Apr. 30, 2016	Jul. 25, 2015
Business Acquisition [Line Items]
Gross	$ 5,009	$ 5,172
Accumulated Amortization	(2,489)	(2,813)
Total purchased intangible assets with finite lives, net	2,520	2,359
In-process research and development, with indefinite lives	224	17
Total finite and indefinite lives Intangible assets, Gross	5,233	5,189
Total finite and indefinite lives intangible assets, net	2,744	2,376
TECHNOLOGY
Business Acquisition [Line Items]
Gross	3,103	3,418
Accumulated Amortization	(1,297)	(1,818)
Total purchased intangible assets with finite lives, net	1,806	1,600
CUSTOMER RELATIONSHIPS
Business Acquisition [Line Items]
Gross	1,821	1,699
Accumulated Amortization	(1,156)	(971)
Total purchased intangible assets with finite lives, net	665	728
OTHER
Business Acquisition [Line Items]
Gross	85	55
Accumulated Amortization	(36)	(24)
Total purchased intangible assets with finite lives, net	$ 49	$ 31