Commitments And Contingencies (Additional Information) (Details) (USD $)					3 Months Ended						39 Months Ended	3 Months Ended
	Oct. 27, 2012	Jul. 28, 2012	Oct. 27, 2012 Investor [Member]	Jul. 28, 2012 Investor [Member]	Oct. 27, 2012 Acquisition [Member]	Oct. 29, 2011 Acquisition [Member]	Jan. 26, 2013 Insieme Networks Inc [Member]	Oct. 27, 2012 Insieme Networks Inc [Member]	Oct. 27, 2012 VCE [Member]	Oct. 29, 2011 VCE [Member]	Oct. 27, 2012 VCE [Member]	Oct. 27, 2012 Minimum [Member] D Y	Oct. 27, 2012 Maximum [Member] Y	Oct. 27, 2012 Maximum [Member] Insieme Networks Inc [Member]	Oct. 27, 2012 November 2012 Amendment [Member] Maximum [Member] Insieme Networks Inc [Member]
Site Contingency [Line Items]
Term of operating leases, in years												1
Total purchase commitments for inventory	$ 3,725,000,000	$ 3,869,000,000
Liability for unconditional purchase agreements	171,000,000	193,000,000
Compensation expense connection with the business combinations and asset purchases					12,000,000	14,000,000
Future compensation expense & contingent consideration					817,000,000									750,000,000	863,000,000
Funding commitments			124,000,000	120,000,000
Cumulative investment in entity									397,000,000		397,000,000
Percentage of outstanding equity owned in entity							89.00%	86.00%	35.00%		35.00%
Payments to Acquire Additional Interest in Subsidiaries							35,000,000
Percentage of VCE's losses									36.80%	36.80%
Income (Loss) from Equity Method Investments									42,000,000	31,000,000	281,000,000
VCE-Carrying Value									116,000,000		116,000,000
Variable Interest Entity, Financial or Other Support, Amount								100,000,000
Warranty Time Period												90
Warranty Period For Products													5
Brazilian authority claim of import tax evasion by importer, tax portion	427,000,000
Brazilian authority claim of import tax evasion by importer, interest portion	1,100,000,000
Brazilian authority claim of import tax evasion by importer, penalties portion	$ 1,900,000,000