v2.4.1.9

Borrowings (Schedule Of Short-Term Debt) (Details) (USD $) In Millions, unless otherwise specified | Apr. 25, 2015 | Jul. 26, 2014
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Short-term Debt [Line Items] |  |
Amount | $ 4,418 us-gaap_DebtCurrent | $ 508 us-gaap_DebtCurrent
Current portion of long-term debt |  |
Short-term Debt [Line Items] |  |
Amount | 3,914 us-gaap_DebtCurrent / us-gaap_ShortTermDebtTypeAxis = us-gaap_SeniorNotesMember | 500 us-gaap_DebtCurrent / us-gaap_ShortTermDebtTypeAxis = us-gaap_SeniorNotesMember
Effective Rate | 2.47%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_ShortTermDebtTypeAxis = us-gaap_SeniorNotesMember | 3.11%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_ShortTermDebtTypeAxis = us-gaap_SeniorNotesMember
Commercial Paper [Member] |  |
Short-term Debt [Line Items] |  |
Amount | 500 us-gaap_DebtCurrent / us-gaap_ShortTermDebtTypeAxis = us-gaap_CommercialPaperMember | 0 us-gaap_DebtCurrent / us-gaap_ShortTermDebtTypeAxis = us-gaap_CommercialPaperMember
Effective Rate | 0.16%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_ShortTermDebtTypeAxis = us-gaap_CommercialPaperMember | 0.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_ShortTermDebtTypeAxis = us-gaap_CommercialPaperMember
Other short-term debt |  |
Short-term Debt [Line Items] |  |
Amount | $ 4 us-gaap_DebtCurrent / us-gaap_ShortTermDebtTypeAxis = us-gaap_ShortTermDebtMember | $ 8 us-gaap_DebtCurrent / us-gaap_ShortTermDebtTypeAxis = us-gaap_ShortTermDebtMember
Effective Rate | 2.62%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_ShortTermDebtTypeAxis = us-gaap_ShortTermDebtMember | 2.67%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_ShortTermDebtTypeAxis = us-gaap_ShortTermDebtMember

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- Definition Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
Name: | us-gaap_DebtCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

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- Details
Name: | us-gaap_ShortTermDebtTypeAxis=us-gaap_CommercialPaperMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ShortTermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ShortTermDebtTypeAxis=us-gaap_ShortTermDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |