Goodwill and Purchased Intangible Assets (Schedule Of Purchased Intangible Assets With Finite And Indefinite Lives) (Detail) (USD $) In Millions, unless otherwise specified	Jul. 27, 2013	Jul. 28, 2012
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Gross	$ 5,159
Finite-Lived Intangible Assets, Accumulated Amortization	(1,842)	(2,618)
Finite-Lived Intangible Assets, Net	3,317
Indefinite-Lived Intangible Assets	86
Total Purchased Intangible Assets, Gross	5,245	4,577
Purchased intangible assets, net	3,403	1,959
Technology-Based Intangible Assets [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Gross	3,563	2,267
Finite-Lived Intangible Assets, Accumulated Amortization	(1,366)	(908)
Finite-Lived Intangible Assets, Net	2,197	1,359
Customer Relationships
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Gross	1,566	2,261
Finite-Lived Intangible Assets, Accumulated Amortization	(466)	(1,669)
Finite-Lived Intangible Assets, Net	1,100	592
Other Intangible Assets [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Gross	30	49
Finite-Lived Intangible Assets, Accumulated Amortization	(10)	(41)
Finite-Lived Intangible Assets, Net	$ 20	$ 8