Segment Information And Major Customers (Reportable Segments) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 25, 2014	Jan. 26, 2013	Jan. 25, 2014	Jan. 26, 2013
Segment Reporting Information [Line Items]
Revenues	$ 11,155	$ 12,098	$ 23,240	$ 23,974
Segment Gross Margin	6,840	7,542	14,457	14,984
Total Gross Margin	5,951	7,343	13,358	14,582
Unallocated Corporate Items
Segment Reporting Information [Line Items]
Total Gross Margin	(889)	(199)	(1,099)	(402)
Americas
Segment Reporting Information [Line Items]
Revenues	6,460	7,136	13,776	14,159
Segment Gross Margin	3,977	4,413	8,627	8,881
EMEA
Segment Reporting Information [Line Items]
Revenues	2,896	3,093	5,829	5,934
Segment Gross Margin	1,870	2,008	3,758	3,806
Asia Pacific Japan And China
Segment Reporting Information [Line Items]
Revenues	1,799	1,869	3,635	3,881
Segment Gross Margin	$ 993	$ 1,121	$ 2,072	$ 2,297