Goodwill and Purchased Intangible Assets (Schedule Of Purchased Intangible Assets With Finite And Indefinite Lives) (Details) - USD ($) $ in Millions	Jul. 25, 2015	Jul. 26, 2014
Business Acquisition [Line Items]
Gross	$ 5,172	$ 5,857
Accumulated Amortization	(2,813)	(2,709)
Total	2,359	3,148
In-process research and development, with indefinite lives	17	132
Total- Gross	5,189	5,989
Total- Net	2,376	3,280
TECHNOLOGY
Business Acquisition [Line Items]
Gross	3,418	4,100
Accumulated Amortization	(1,818)	(1,976)
Total	1,600	2,124
CUSTOMER RELATIONSHIPS
Business Acquisition [Line Items]
Gross	1,699	1,706
Accumulated Amortization	(971)	(720)
Total	728	986
OTHER
Business Acquisition [Line Items]
Gross	55	51
Accumulated Amortization	(24)	(13)
Total	$ 31	$ 38