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Financing Receivables And Guarantees (Schedule Of Financing Receivables Categorized By Internal Credit Risk Rating) (Detail) (USD $) In Millions, unless otherwise specified | Oct. 26, 2013 | Jul. 27, 2013 | Oct. 27, 2012
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Financing Receivables And Guarantees [Line Items] |  |  |
Gross Financing Receivable, Net of Unearned | $ 8,375 | $ 8,292 | $ 7,795
Rating One To Four [Member] |  |  |
Financing Receivables And Guarantees [Line Items] |  |  |
Gross Financing Receivable, Net of Unearned | 4,468 | 4,399 |
Rating Five To Six [Member] |  |  |
Financing Receivables And Guarantees [Line Items] |  |  |
Gross Financing Receivable, Net of Unearned | 3,385 | 3,400 |
Rating Seven And Higher [Member] |  |  |
Financing Receivables And Guarantees [Line Items] |  |  |
Gross Financing Receivable, Net of Unearned | 270 | 242 |
Total Internal Credit Risk Rating [Member] |  |  |
Financing Receivables And Guarantees [Line Items] |  |  |
Gross Financing Receivable, Net of Unearned | 8,123 | 8,041 |
Residual Value [Member] |  |  |
Financing Receivables And Guarantees [Line Items] |  |  |
Gross Financing Receivable, Net of Unearned | 252 | 251 |
Lease Receivables |  |  |
Financing Receivables And Guarantees [Line Items] |  |  |
Gross Financing Receivable, Net of Unearned | 3,549 | 3,507 | 3,340
Lease Receivables | Rating One To Four [Member] |  |  |
Financing Receivables And Guarantees [Line Items] |  |  |
Gross Financing Receivable, Net of Unearned | 1,695 | 1,681 |
Lease Receivables | Rating Five To Six [Member] |  |  |
Financing Receivables And Guarantees [Line Items] |  |  |
Gross Financing Receivable, Net of Unearned | 1,498 | 1,482 |
Lease Receivables | Rating Seven And Higher [Member] |  |  |
Financing Receivables And Guarantees [Line Items] |  |  |
Gross Financing Receivable, Net of Unearned | 104 | 93 |
Lease Receivables | Total Internal Credit Risk Rating [Member] |  |  |
Financing Receivables And Guarantees [Line Items] |  |  |
Gross Financing Receivable, Net of Unearned | 3,297 | 3,256 |
Lease Receivables | Residual Value [Member] |  |  |
Financing Receivables And Guarantees [Line Items] |  |  |
Gross Financing Receivable, Net of Unearned | 252 | 251 |
Loan Receivables |  |  |
Financing Receivables And Guarantees [Line Items] |  |  |
Gross Financing Receivable, Net of Unearned | 1,808 | 1,649 | 1,816
Loan Receivables | Rating One To Four [Member] |  |  |
Financing Receivables And Guarantees [Line Items] |  |  |
Gross Financing Receivable, Net of Unearned | 981 | 842 |
Loan Receivables | Rating Five To Six [Member] |  |  |
Financing Receivables And Guarantees [Line Items] |  |  |
Gross Financing Receivable, Net of Unearned | 777 | 777 |
Loan Receivables | Rating Seven And Higher [Member] |  |  |
Financing Receivables And Guarantees [Line Items] |  |  |
Gross Financing Receivable, Net of Unearned | 50 | 30 |
Loan Receivables | Total Internal Credit Risk Rating [Member] |  |  |
Financing Receivables And Guarantees [Line Items] |  |  |
Gross Financing Receivable, Net of Unearned | 1,808 | 1,649 |
Financed Service Contracts And Other |  |  |
Financing Receivables And Guarantees [Line Items] |  |  |
Gross Financing Receivable, Net of Unearned | 3,018 | 3,136 | 2,639
Financed Service Contracts And Other | Rating One To Four [Member] |  |  |
Financing Receivables And Guarantees [Line Items] |  |  |
Gross Financing Receivable, Net of Unearned | 1,792 | 1,876 |
Financed Service Contracts And Other | Rating Five To Six [Member] |  |  |
Financing Receivables And Guarantees [Line Items] |  |  |
Gross Financing Receivable, Net of Unearned | 1,110 | 1,141 |
Financed Service Contracts And Other | Rating Seven And Higher [Member] |  |  |
Financing Receivables And Guarantees [Line Items] |  |  |
Gross Financing Receivable, Net of Unearned | 116 | 119 |
Financed Service Contracts And Other | Total Internal Credit Risk Rating [Member] |  |  |
Financing Receivables And Guarantees [Line Items] |  |  |
Gross Financing Receivable, Net of Unearned | $ 3,018 | $ 3,136 |

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- Definition Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(3)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Subparagraph 3 -Article 9 + Details
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