Segment Information and Major Customers (Summary Of Reportable Segments) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 28, 2012	Jul. 30, 2011	Jul. 31, 2010
Segment Reporting Information [Line Items]
Net sales	$ 46,061	$ 43,218	$ 40,040
Gross margin	28,209	26,536	25,643
Segment Reporting Information Net Sales | Americas
Segment Reporting Information [Line Items]
Net sales	26,501	25,015	23,334
Segment Reporting Information Net Sales | EMEA
Segment Reporting Information [Line Items]
Net sales	12,075	11,604	10,825
Segment Reporting Information Net Sales | APJC
Segment Reporting Information [Line Items]
Net sales	7,485	6,599	5,881
Segment Reporting Information Gross Margin
Segment Reporting Information [Line Items]
Gross margin	28,763	27,361	26,119
Segment Reporting Information Gross Margin | Unallocated corporate items
Segment Reporting Information [Line Items]
Gross margin	(554)	(825)	(476)
Segment Reporting Information Gross Margin | Americas
Segment Reporting Information [Line Items]
Gross margin	16,639	15,766	15,042
Segment Reporting Information Gross Margin | EMEA
Segment Reporting Information [Line Items]
Gross margin	7,605	7,452	7,235
Segment Reporting Information Gross Margin | APJC
Segment Reporting Information [Line Items]
Gross margin	$ 4,519	$ 4,143	$ 3,842