Segment Information and Major Customers (Additional Information) (Details) (USD $)	12 Months Ended
	Jul. 26, 2014 customer segment	Jul. 27, 2013 customer	Jul. 28, 2012 customer
Segment Reporting Information [Line Items]
Number of geographic segments	3
Revenue:	$ 47,142,000,000	$ 48,607,000,000	$ 46,061,000,000
Number of customer accounted for 10% or more net sales	0	0	0
United States
Segment Reporting Information [Line Items]
Revenue:	24,300,000,000	24,600,000,000	22,600,000,000
Cash and cash equivalents and investments	4,700,000,000	10,200,000,000
International
Segment Reporting Information [Line Items]
Cash and cash equivalents and investments	$ 47,400,000,000	$ 40,400,000,000