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Fair Value Measurements (Financial Assets Measured At Fair Value On A Recurring Basis) (Details) (USD $)
In Millions, unless otherwise specified |
Aug. 03, 2013
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Jul. 28, 2012
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|---|---|---|
| Marketable equity and debt securities | $ 74 | $ 62 |
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Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
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| Marketable equity and debt securities | 0 | 0 |
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Significant Observable Inputs (Level 2) [Member]
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| Marketable equity and debt securities | 74 | 62 |
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Significant Unobservable Inputs (Level 3) [Member]
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| Marketable equity and debt securities | $ 0 | $ 0 |