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Business Combinations - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Oct. 27, 2012	Oct. 29, 2011	Oct. 27, 2012 NDS Group Limited [Member]	Oct. 27, 2012 Other Acquisition [Member] acquisition	Jan. 26, 2013 Meraki Inc. [Member]
Business Acquisition [Line Items]
Number of Businesses Acquired				3
Business Combination, Consideration Transferred			$ 5,005	$ 5	$ 1,200
Cash Acquired from Acquisition			98
Business Combination, Acquisition Related Costs	$ 6	$ 2

This element represents the acquisition-date fair value of the total consideration transferred which consists of the sum of the acquisition-date fair values of the assets transferred by the acquirer, the liabilities incurred by the acquirer to former owners of the acquiree, and the equity interests issued by the acquirer.

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