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Fair Value (Fair Value On A Nonrecurring Basis) (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|
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Oct. 27, 2012
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Jul. 28, 2012
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Oct. 27, 2012
Fair Value, Measurements, Nonrecurring [Member]
Net Carrying Value [Member]
Fair Value, Inputs, Level 3 [Member]
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Oct. 29, 2011
Fair Value, Measurements, Nonrecurring [Member]
Net Carrying Value [Member]
Fair Value, Inputs, Level 3 [Member]
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Oct. 27, 2012
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 3 [Member]
Investments In Privately Held Companies [Member]
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Oct. 29, 2011
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 3 [Member]
Investments In Privately Held Companies [Member]
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Oct. 29, 2011
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 3 [Member]
Property Held For Sale [Member]
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Oct. 27, 2012
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 3 [Member]
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Oct. 29, 2011
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 3 [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||||||||
| Investment in privately held companies | $ 239 | $ 249 | $ 42 | $ 1 | |||||
| Property Held For Sale Fair Value Disclosure | 24 | ||||||||
| Fair Value Nonrecurring Basis Gain Loss Recorded Total | $ (10) | $ (1) | $ (89) | $ (10) | $ (90) | ||||