Segment Information And Major Customers (Summary Of Reportable Segments) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jan. 28, 2012		Jan. 29, 2011		Jan. 28, 2012		Jan. 29, 2011
Segment Reporting Information [Line Items]
Net sales:	$ 11,527		$ 10,407		$ 22,783		$ 21,157
Gross margin:	7,065		6,261		13,955		13,016
United States [Member]
Segment Reporting Information [Line Items]
Net sales:	5,600		5,200		11,200		10,600
Segment Reporting Information Net Sales [Member] | Americas [Member]
Segment Reporting Information [Line Items]
Net sales:	6,552	[1]	6,011	[1]	13,140	[1]	12,327	[1]
Segment Reporting Information Net Sales [Member] | EMEA [Member]
Segment Reporting Information [Line Items]
Net sales:	3,250		2,835		6,095		5,630
Segment Reporting Information Net Sales [Member] | APJC [Member]
Segment Reporting Information [Line Items]
Net sales:	1,725		1,561		3,548		3,200
Segment Reporting Information Gross Margin [Member]
Segment Reporting Information [Line Items]
Gross margin:	7,193		6,489		14,215		13,403
Segment Reporting Information Gross Margin [Member] | Americas [Member]
Segment Reporting Information [Line Items]
Gross margin:	4,106		3,720		8,266		7,771
Segment Reporting Information Gross Margin [Member] | EMEA [Member]
Segment Reporting Information [Line Items]
Gross margin:	2,095		1,814		3,849		3,623
Segment Reporting Information Gross Margin [Member] | APJC [Member]
Segment Reporting Information [Line Items]
Gross margin:	992		955		2,100		2,009
Segment Reporting Information Gross Margin [Member] | Unallocated Corporate Items [Member]
Segment Reporting Information [Line Items]
Gross margin:	$ (128)	[2]	$ (228)	[2]	$ (260)	[2]	$ (387)	[2]

[1] Net sales in the United States were $5.6 billion and $5.2 billion for the three months ended January 28, 2012 and January 29, 2011, respectively. Net sales in the United States were $11.2 billion and $10.6 billion for the six months ended January 28, 2012 and January 29, 2011, respectively.

[2] The unallocated corporate items include the effects of amortization and impairment of acquisition-related intangible assets, share-based compensation expense, and charges related to asset impairments and restructurings.