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Employee Benefit Plans (Summary Of Assumptions Used for Valuation Of Employee Share-Based Awards) (Detail) (USD $)
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3 Months Ended | |
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Oct. 26, 2013
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Oct. 27, 2012
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Restricted Stock [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Granted (In shares) | 10,000,000 | 11,000,000 |
| Grant Date Fair Value Per Share, RSU | $ 23.11 | $ 17.65 |
| Expected dividend yield | 2.70% | 2.90% |
| Range of risk-free interest rates - minimum | 0.00% | 0.10% |
| Range of risk-free interest rates - maximum | 1.40% | 0.70% |
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Performance Shares [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Granted (In shares) | 4,000,000 | 4,000,000 |
| Grant Date Fair Value Per Share, RSU | $ 22.70 | $ 19.26 |
| Expected dividend yield | 2.30% | 2.90% |
| Range of risk-free interest rates - minimum | 0.00% | 0.10% |
| Range of risk-free interest rates - maximum | 1.40% | 0.70% |
| Range of Expected Volatility Rate, Minimum | 17.40% | 18.30% |
| Range of Expected Volatility Rate, Maximum | 70.50% | 64.60% |