Goodwill And Purchased Intangible Assets (Schedule Of Purchased Intangible Assets With Finite And Indefinite Lives) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
	Apr. 28, 2012	Jul. 30, 2011
Business Acquisition [Line Items]
Total purchased intangible assets with finite lives, Gross	$ 4,624
Total, Accumulated Amortization	(2,498)	(1,998)
Total purchased intangible assets with finite lives, Net	2,126
In-process research & development, with indefinite lives, Gross	8	178
In-process research & development, with indefinite lives, net	8	178
Total, Gross	4,632	4,539
Total, Net	2,134	2,541
Technology [Member]
Business Acquisition [Line Items]
Total purchased intangible assets with finite lives, Gross	2,240	1,961
Total, Accumulated Amortization	(802)	(561)
Total purchased intangible assets with finite lives, Net	1,438	1,400
Customer Relationships [Member]
Business Acquisition [Line Items]
Total purchased intangible assets with finite lives, Gross	2,263	2,277
Total, Accumulated Amortization	(1,587)	(1,346)
Total purchased intangible assets with finite lives, Net	676	931
Other [Member]
Business Acquisition [Line Items]
Total purchased intangible assets with finite lives, Gross	121	123
Total, Accumulated Amortization	(109)	(91)
Total purchased intangible assets with finite lives, Net	12	32
Total Purchased Intangible Assets With Finite Lives [Member]
Business Acquisition [Line Items]
Total purchased intangible assets with finite lives, Gross		4,361
Total, Accumulated Amortization		(1,998)
Total purchased intangible assets with finite lives, Net		$ 2,363