Segment Information And Major Customers - Additional Information (Detail) (USD $)	3 Months Ended
	Oct. 27, 2012	Oct. 29, 2011	Jul. 28, 2012
Segment Reporting Information [Line Items]
Entity-Wide Disclosure on Geographic Areas, Basis for Attributing Revenue to Countries	three
Revenue, Net	$ 11,876,000,000	$ 11,256,000,000
United States [Member]
Segment Reporting Information [Line Items]
Cash, Cash Equivalents, and Short-term Investments	7,500,000,000		6,200,000,000
Revenue, Net	6,100,000,000	5,600,000,000
International [Member]
Segment Reporting Information [Line Items]
Cash, Cash Equivalents, and Short-term Investments	$ 37,500,000,000		$ 42,500,000,000