Segment Information And Major Customers (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Apr. 28, 2012	Apr. 30, 2011	Apr. 28, 2012	Apr. 30, 2011	Jul. 30, 2011
Segment Reporting Information [Line Items]
Number of geographic segments			three		four
Net sales	$ 11,588,000,000	$ 10,866,000,000	$ 34,371,000,000	$ 32,023,000,000
United States [Member]
Segment Reporting Information [Line Items]
Cash and cash equivalents and investments	6,100,000,000		6,100,000,000		4,800,000,000
Net sales	5,500,000,000	5,300,000,000	16,600,000,000	16,000,000,000
International [Member]
Segment Reporting Information [Line Items]
Cash and cash equivalents and investments	$ 42,300,000,000		$ 42,300,000,000		39,800,000,000