Business Combinations (Summary Of Allocation Of Total Purchase Consideration) (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Apr. 27, 2013
Business Acquisition [Line Items]
Total purchase consideration	$ 1,580
Goodwill	1,197
Net Liabilities Assumed	(100)
Purchased Intangible Assets	483
Meraki, Inc. [Member]
Business Acquisition [Line Items]
Total purchase consideration	974
Goodwill	744
Net Liabilities Assumed	(59)
Purchased Intangible Assets	289
Intucell Ltd. [Member]
Business Acquisition [Line Items]
Total purchase consideration	360
Goodwill	277
Net Liabilities Assumed	(23)
Purchased Intangible Assets	106
NDS Group Limited [Member]
Business Acquisition [Line Items]
Cash consideration to seller	4,012
Repayments of assumed debt to third party creditors	993
Total purchase consideration	5,005
Cash and Cash Equivalents	98
Accounts Receivable, net	199
Other tangible assets	268
Goodwill	3,444
Deferred tax liabilities, net	(378)
Liabilities assumed	(372)
Purchased Intangible Assets	1,746
All others (seven in total)
Business Acquisition [Line Items]
Total purchase consideration	246
Goodwill	176
Net Liabilities Assumed	(18)
Purchased Intangible Assets	$ 88