v2.4.0.6

Segment Information and Major Customers (Summary Of Net Sales For Groups Of Similar Products And Services) (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Jul. 28, 2012 | Jul. 30, 2011 | Jul. 31, 2010
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | $ 46,061 | $ 43,218 | $ 40,040
Service |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 9,735 | 8,692 | 7,620
Sales Revenue, Product Line | Switching |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 14,531 | 14,130 | 14,074
Sales Revenue, Product Line | NGN Routing |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 8,425 | 8,264 | 7,868
Sales Revenue, Product Line | Collaboration |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 4,139 | 4,013 | 2,981
Sales Revenue, Product Line | Service Provider Video |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 3,858 | 3,483 | 3,294
Sales Revenue, Product Line | Wireless |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 1,699 | 1,427 | 1,134
Sales Revenue, Product Line | Security |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 1,349 | 1,200 | 1,302
Sales Revenue, Product Line | Data Center |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 1,298 | 694 | 196
Sales Revenue, Product Line | Other products |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 1,027 | 1,315 | 1,571
Sales Revenue, Product Line | Product |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | $ 36,326 | $ 34,526 | $ 32,420

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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 1 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration