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Investments (Realized Net Gains (Losses) Related To Available-For-Sale Investments) (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Jul. 28, 2012
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Jul. 30, 2011
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Jul. 31, 2010
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| Schedule of Available-for-sale Securities [Line Items] | |||
| Total net realized gains (losses) | $ 101 | $ 179 | $ 169 |
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Publicly Traded Equity Securities
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| Schedule of Available-for-sale Securities [Line Items] | |||
| Total net realized gains (losses) | 43 | 88 | 66 |
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Fixed Income Securities
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| Schedule of Available-for-sale Securities [Line Items] | |||
| Total net realized gains (losses) | $ 58 | $ 91 | $ 103 |