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Investments (Realized Net Gains (Losses) Related To Available-For-Sale Investments) (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | |
|---|---|---|
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Oct. 26, 2013
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Oct. 27, 2012
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| Net gains (losses) on investments | $ 83 | $ 27 |
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Publicly Traded Equity Securities [Member]
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| Net gains (losses) on investments | 75 | 10 |
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Fixed Income Investments [Member]
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| Net gains (losses) on investments | $ 8 | $ 17 |