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Derivative Instruments (Effect Of Derivative Instruments Designated As Fair Value Hedges And Underlying Hedged Items On Consolidated Statements Of Operations Summary) (Details) (Derivatives Designated As Fair Value Hedging Instruments [Member], 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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| Hedge Underlying Gain Loss [Line Items] | ||
| Gains (losses) on derivative instruments | $ (21) | $ 35 |
| Gains (losses) related to hedged items | 21 | (36) |
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Equity Contract [Member] | Other Income (loss), net [Member]
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| Hedge Underlying Gain Loss [Line Items] | ||
| Gains (losses) on derivative instruments | (3) | 0 |
| Gains (losses) related to hedged items | 3 | 0 |
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Interest Rate Contract [Member] | Interest Expense [Member]
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| Hedge Underlying Gain Loss [Line Items] | ||
| Gains (losses) on derivative instruments | (18) | 35 |
| Gains (losses) related to hedged items | $ 18 | $ (36) |