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Employee Benefit Plans (Summary Assumptions Related To And Valuation Of Employee Share-Based Awards (Time-Based Restricted Stock Units)) (Detail) (Time Based Restricted Stock Units R S U [Member], USD $)
In Millions, except Per Share data, unless otherwise specified |
3 Months Ended | |
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Oct. 27, 2012
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Oct. 29, 2011
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Time Based Restricted Stock Units R S U [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Share Based Compensation Arrangement By Share Based Payment Award Equivalent Number Of Shares For Full Value Awards | 11 | 11 |
| Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Stock Price | $ 17.65 | $ 15.69 |
| Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate | 2.90% | 1.50% |