Goodwill and Purchased Intangible Assets (Schedule Of Purchased Intangible Assets With Finite And Indefinite Lives) (Details) (USD $) In Millions, unless otherwise specified	Jan. 24, 2015	Jul. 26, 2014
Business Acquisition [Line Items]
Gross	$ 5,780	$ 5,857
Accumulated Amortization	(3,136)	(2,709)
Total purchased intangible assets with finite lives, net	2,644	3,148
In-process research and development, with indefinite lives	111	132
Total- Gross	5,891	5,989
Total, net	2,755	3,280
TECHNOLOGY
Business Acquisition [Line Items]
Gross	4,020	4,100
Accumulated Amortization	(2,270)	(1,976)
Total purchased intangible assets with finite lives, net	1,750	2,124
CUSTOMER RELATIONSHIPS
Business Acquisition [Line Items]
Gross	1,709	1,706
Accumulated Amortization	(847)	(720)
Total purchased intangible assets with finite lives, net	862	986
OTHER
Business Acquisition [Line Items]
Gross	51	51
Accumulated Amortization	(19)	(13)
Total purchased intangible assets with finite lives, net	$ 32	$ 38