Business Combinations (Summary Of Allocation Of Total Purchase Consideration) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Oct. 25, 2014
Business Acquisition [Line Items]
Purchase Consideration	$ 187
Net Liabilities Assumed	(17)
Purchased Intangible Assets	58
Goodwill	146
Metacloud, Inc.
Business Acquisition [Line Items]
Purchase Consideration	149
Net Liabilities Assumed	(7)
Purchased Intangible Assets	29
Goodwill	127
Other
Business Acquisition [Line Items]
Purchase Consideration	38
Net Liabilities Assumed	(10)
Purchased Intangible Assets	29
Goodwill	$ 19