Segment Information And Major Customers (Reportable Segments) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Oct. 27, 2012	Oct. 29, 2011
Segment Reporting Information [Line Items]
Revenue, Net	$ 11,876	$ 11,256
Gross Profit	7,239	6,890
United States [Member]
Segment Reporting Information [Line Items]
Revenue, Net	6,100	5,600
Segment Reporting Information Net Sales [Member] | Americas [Member]
Segment Reporting Information [Line Items]
Revenue, Net	7,023	6,588
Segment Reporting Information Net Sales [Member] | Europe Middle East And Africa [Member]
Segment Reporting Information [Line Items]
Revenue, Net	2,841	2,845
Segment Reporting Information Net Sales [Member] | Asia Pacific Japan And China [Member]
Segment Reporting Information [Line Items]
Revenue, Net	2,012	1,823
Segment Reporting Information Gross Margin [Member]
Segment Reporting Information [Line Items]
Gross Profit	7,442	7,022
Segment Reporting Information Gross Margin [Member] | Unallocated Amount to Segment [Member]
Segment Reporting Information [Line Items]
Gross Profit	(203)	(132)
Segment Reporting Information Gross Margin [Member] | Americas [Member]
Segment Reporting Information [Line Items]
Gross Profit	4,468	4,160
Segment Reporting Information Gross Margin [Member] | Europe Middle East And Africa [Member]
Segment Reporting Information [Line Items]
Gross Profit	1,798	1,754
Segment Reporting Information Gross Margin [Member] | Asia Pacific Japan And China [Member]
Segment Reporting Information [Line Items]
Gross Profit	$ 1,176	$ 1,108