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