Segment Information and Major Customers (Summary Of Reportable Segments) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 27, 2013	Jul. 28, 2012	Jul. 30, 2011
Segment Reporting Information [Line Items]
Revenue	$ 48,607	$ 46,061	$ 43,218
Gross margin	29,440	28,209	26,536
Segment Reporting Information Net Sales | Americas
Segment Reporting Information [Line Items]
Revenue	28,639	26,501	25,015
Segment Reporting Information Net Sales | EMEA
Segment Reporting Information [Line Items]
Revenue	12,210	12,075	11,604
Segment Reporting Information Net Sales | APJC
Segment Reporting Information [Line Items]
Revenue	7,758	7,485	6,599
Segment Reporting Information Gross Margin
Segment Reporting Information [Line Items]
Gross margin	30,400	28,763	27,361
Segment Reporting Information Gross Margin | Unallocated corporate items
Segment Reporting Information [Line Items]
Gross margin	(960)	(554)	(825)
Segment Reporting Information Gross Margin | Americas
Segment Reporting Information [Line Items]
Gross margin	17,887	16,639	15,766
Segment Reporting Information Gross Margin | EMEA
Segment Reporting Information [Line Items]
Gross margin	7,876	7,605	7,452
Segment Reporting Information Gross Margin | APJC
Segment Reporting Information [Line Items]
Gross margin	$ 4,637	$ 4,519	$ 4,143