v2.4.0.8

Fair Value (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Detail) (USD $) In Millions, unless otherwise specified | Oct. 26, 2013 | Jul. 27, 2013
--- | --- | ---
Assets at Fair Value, Recurring | $ 46,316 | $ 48,912
Cash Equivalents [Member] | Money Market Funds [Member] |  |
Assets at Fair Value, Recurring | 3,145 | 6,045
Available-for-sale Securities [Member] | US Government Securities[Member] |  |
Assets at Fair Value, Recurring | 28,638 | 27,823
Available-for-sale Securities [Member] | US Government Agencies Securities [Member] |  |
Assets at Fair Value, Recurring | 2,399 | 3,089
Available-for-sale Securities [Member] | Non-US Government and Agency Securities [Member] |  |
Assets at Fair Value, Recurring | 909 | 1,095
Available-for-sale Securities [Member] | Corporate Debt Securities [Member] |  |
Assets at Fair Value, Recurring | 8,026 | 7,881
Available-for-sale Securities [Member] | U.S. agency mortgage-backed Securities |  |
Assets at Fair Value, Recurring | 461 |
Available-for-sale Securities [Member] | Equity Securities [Member] |  |
Assets at Fair Value, Recurring | 2,514 | 2,797
Derivative Assets [Member] |  |
Assets at Fair Value, Recurring | 224 | 182
Derivative Liabilities [Member] |  |
Liabilities at Fair Value, Recurring | 145 | 171
Fair Value, Inputs, Level 1 [Member] |  |
Assets at Fair Value, Recurring | 5,659 | 8,842
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] |  |
Assets at Fair Value, Recurring | 3,145 | 6,045
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] |  |
Assets at Fair Value, Recurring | 2,514 | 2,797
Fair Value, Inputs, Level 2 [Member] |  |
Assets at Fair Value, Recurring | 40,657 | 40,070
Fair Value, Inputs, Level 2 [Member] | US Government Securities[Member] |  |
Assets at Fair Value, Recurring | 28,638 | 27,823
Fair Value, Inputs, Level 2 [Member] | US Government Agencies Securities [Member] |  |
Assets at Fair Value, Recurring | 2,399 | 3,089
Fair Value, Inputs, Level 2 [Member] | Non-US Government and Agency Securities [Member] |  |
Assets at Fair Value, Recurring | 909 | 1,095
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |
Assets at Fair Value, Recurring | 8,026 | 7,881
Fair Value, Inputs, Level 2 [Member] | U.S. agency mortgage-backed Securities |  |
Assets at Fair Value, Recurring | 461 |
Fair Value, Inputs, Level 2 [Member] | Derivative Assets [Member] |  |
Assets at Fair Value, Recurring | 224 | 182
Fair Value, Inputs, Level 2 [Member] | Derivative Liabilities [Member] |  |
Liabilities at Fair Value, Recurring | $ 145 | $ 171

X
- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureRecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity. + References No definition available. + Details
Name: | us-gaap_LiabilitiesFairValueDisclosureRecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant