Segment Information and Major Customers (Summary Of Reportable Segments) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 25, 2015	Jul. 26, 2014	Jul. 27, 2013
Segment Reporting Information [Line Items]
Revenue:	$ 49,161	$ 47,142	$ 48,607
Gross margin:	29,681	27,769	29,440
Unallocated corporate items
Segment Reporting Information [Line Items]
Gross margin:	(1,001)	(1,562)	(960)
Americas
Segment Reporting Information [Line Items]
Revenue:	29,655	27,781	28,639
Gross margin:	18,670	17,379	17,887
EMEA
Segment Reporting Information [Line Items]
Revenue:	12,322	12,006	12,210
Gross margin:	7,705	7,700	7,876
APJC
Segment Reporting Information [Line Items]
Revenue:	7,184	7,355	7,758
Gross margin:	4,307	4,252	4,637
Segment total
Segment Reporting Information [Line Items]
Gross margin:	$ 30,682	$ 29,331	$ 30,400