Commitments And Contingencies (Narrative) (Details) (USD $)	9 Months Ended		3 Months Ended		9 Months Ended
	Apr. 28, 2012	Jul. 30, 2011	Apr. 28, 2012 Acquisition [Member]	Apr. 30, 2011 Acquisition [Member]	Apr. 28, 2012 Acquisition [Member]	Apr. 30, 2011 Acquisition [Member]	Apr. 28, 2012 Minimum [Member] D Y	Apr. 28, 2012 Maximum [Member] Y	Apr. 28, 2012 Private Equity Funds [Member] Investor [Member]	Jul. 30, 2011 Private Equity Funds [Member] Investor [Member]
Site Contingency [Line Items]
Term of operating leases, in years							1
Investor Funding Commitments	$ 4,369,000,000	$ 4,313,000,000
Liability for purchase commitments	173,000,000	168,000,000
Compensation expense connection with the business combinations and asset purchases			12,000,000	18,000,000	40,000,000	113,000,000
Investment in Insieme Networks, Inc. including funding and a license of technology	100,000,000
Ownership percentage as a result of investment	90.00%
Maximum potential amount that could be recorded as compensation expense	750,000,000
Future compensation expense & contingent consideration	786,000,000
Funding commitments									136,000,000	192,000,000
VCE-Investor Funding	322,000,000								211,000,000
VCE-Carrying Value	123,000,000
VCE-Cumulative Investor Ownership	35.00%
Warranty period for products, in years								5
Warranty period for products, in days							90
Brazilian authority claim of import tax evasion by importer, tax portion	429,000,000
Brazilian authority claim of import tax evasion by importer, interest portion	1,000,000,000
Brazilian authority claim of import tax evasion by importer, penalties portion	$ 2,000,000,000