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Investments (Gross Realized Gains And Gross Realized Losses Related To Available-For-Sale Investments (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | |
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Oct. 27, 2012
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Oct. 29, 2011
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| Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract] | ||
| Available-for-sale Securities, Gross Realized Gains | $ 72 | $ 236 |
| Available-for-sale Securities, Gross Realized Losses | (45) | (227) |
| Available-for-sale Securities, Gross Realized Gain (Loss) | $ 27 | $ 9 |
| X | ||||||||||
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- Definition
This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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