Segment Information And Major Customers (Reportable Segments) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 26, 2013	Jan. 28, 2012	Jan. 26, 2013	Jan. 28, 2012
Segment Reporting Information [Line Items]
Revenue, Net	$ 12,098	$ 11,527	$ 23,974	$ 22,783
Gross Profit	7,343	7,065	14,582	13,955
United States [Member]
Segment Reporting Information [Line Items]
Revenue, Net	6,100	5,600	12,200	11,200
Segment Reporting Information Net Sales [Member] | Americas [Member]
Segment Reporting Information [Line Items]
Revenue, Net	7,136	6,552	14,159	13,140
Gross Profit	4,413	4,106	8,881	8,266
Segment Reporting Information Net Sales [Member] | Europe Middle East And Africa [Member]
Segment Reporting Information [Line Items]
Revenue, Net	3,093	3,250	5,934	6,095
Gross Profit	2,008	2,095	3,806	3,849
Segment Reporting Information Net Sales [Member] | Asia Pacific Japan And China [Member]
Segment Reporting Information [Line Items]
Revenue, Net	1,869	1,725	3,881	3,548
Gross Profit	1,121	992	2,297	2,100
Segment Reporting Information Gross Margin [Member]
Segment Reporting Information [Line Items]
Gross Profit	7,542	7,193	14,984	14,215
Segment Reporting Information Gross Margin [Member] | Unallocated Amount to Segment [Member]
Segment Reporting Information [Line Items]
Gross Profit	$ (199)	$ (128)	$ (402)	$ (260)