Segment Information And Major Customers (Reportable Segments) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Oct. 26, 2013	Oct. 27, 2012
Segment Reporting Information [Line Items]
Revenues	$ 12,085	$ 11,876
Segment Gross Margin	7,617	7,442
Total Gross Margin	7,407	7,239
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Total Gross Margin	(210)	(203)
Americas [Member]
Segment Reporting Information [Line Items]
Revenues	7,316	7,023
Segment Gross Margin	4,650	4,468
EMEA
Segment Reporting Information [Line Items]
Revenues	2,933	2,841
Segment Gross Margin	1,888	1,798
Asia Pacific Japan And China [Member]
Segment Reporting Information [Line Items]
Revenues	1,836	2,012
Segment Gross Margin	$ 1,079	$ 1,176