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Financing Receivables And Guarantees (Schedule Of Financing Receivables By Portfolio Segment Aging Analysis) (Detail) (USD $) In Millions, unless otherwise specified | Oct. 26, 2013 | Jul. 27, 2013 | Oct. 27, 2012
--- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
31 to 60 Days Past Due | $ 248 | $ 166 |
61 to 90 Days Past Due | 103 | 99 |
Greater Than 90 Days Past Due | 441 | 527 |
Total Past Due | 792 | 792 |
Class Of Financing Receivable Current | 7,583 | 7,500 |
Gross Financing Receivable, Net of Unearned | 8,375 | 8,292 | 7,795
Non-accrual financing receivables | 47 | 56 |
Impaired Financing Receivables | 52 | 42 |
Lease Receivables |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
31 to 60 Days Past Due | 135 | 85 |
61 to 90 Days Past Due | 60 | 48 |
Greater Than 90 Days Past Due | 148 | 124 |
Total Past Due | 343 | 257 |
Class Of Financing Receivable Current | 3,206 | 3,250 |
Gross Financing Receivable, Net of Unearned | 3,549 | 3,507 | 3,340
Non-accrual financing receivables | 28 | 27 |
Impaired Financing Receivables | 24 | 22 |
Loan Receivables |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
31 to 60 Days Past Due | 28 | 6 |
61 to 90 Days Past Due | 2 | 3 |
Greater Than 90 Days Past Due | 16 | 11 |
Total Past Due | 46 | 20 |
Class Of Financing Receivable Current | 1,762 | 1,629 |
Gross Financing Receivable, Net of Unearned | 1,808 | 1,649 | 1,816
Non-accrual financing receivables | 7 | 11 |
Impaired Financing Receivables | 17 | 9 |
Financed Service Contracts And Other |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
31 to 60 Days Past Due | 85 | 75 |
61 to 90 Days Past Due | 41 | 48 |
Greater Than 90 Days Past Due | 277 | 392 |
Total Past Due | 403 | 515 |
Class Of Financing Receivable Current | 2,615 | 2,621 |
Gross Financing Receivable, Net of Unearned | 3,018 | 3,136 | 2,639
Non-accrual financing receivables | 12 | 18 |
Impaired Financing Receivables | $ 11 | $ 11 |

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- Definition Financing receivables that are less than 60 days past due but more than 29 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953401-111524 + Details
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- Definition Financing receivables that are less than 90 days past due but more than 59 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953401-111524 + Details
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- Definition Financing receivables that are equal to or greater than 90 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953401-111524 + Details
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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5111-111524 + Details
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- Definition Recorded Investment in financing receivables that are past due at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953401-111524 + Details
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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953550-111524 + Details
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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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