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Fair Value (Fair Value On A Nonrecurring Basis) (Detail) (Fair Value, Measurements, Nonrecurring, Fair Value, Inputs, Level 3 [Member], Investments In Privately Held Companies, 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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Gains or Losses Included In Other Income (Loss), Net
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| Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items] | ||
| Gains (Losses) for the Period | $ (1) | $ (10) |
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Net Carrying Value
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| Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items] | ||
| Investment in privately held companies | $ 0 | $ 42 |