Goodwill And Purchased Intangible Assets (Schedule Of Purchased Intangible Assets With Finite And Indefinite Lives) (Detail) (USD $) In Millions, unless otherwise specified	Apr. 26, 2014	Jul. 27, 2013
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Gross	$ 5,871	$ 5,159
Accumulated Amortization	(2,554)	(1,842)
Finite-Lived Intangible Assets, Net	3,317	3,317
Indefinite-Lived Intangible Assets (Excluding Goodwill)	144	86
Gross Purchased Intangibles	6,015	5,245
Total Purchased intangible assets, net	3,461	3,403
Technology [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Gross	4,117	3,563
Accumulated Amortization	(1,885)	(1,366)
Finite-Lived Intangible Assets, Net	2,232	2,197
Customer Relationships [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Gross	1,698	1,566
Accumulated Amortization	(653)	(466)
Finite-Lived Intangible Assets, Net	1,045	1,100
Other Intangible Assets
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Gross	56	30
Accumulated Amortization	(16)	(10)
Finite-Lived Intangible Assets, Net	$ 40	$ 20