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Investments (Net Realized Gains and Losses on Fixed Income and Publicly Traded Equity Securities) (Details) (USD $)
In Millions
3 Months Ended 9 Months Ended
Apr. 30, 2011
May 01, 2010
Apr. 30, 2011
May 01, 2010
Investments        
Net gains on investments in publicly traded equity securities $ 42 $ 36 $ 72 $ 64
Net gains on investments in fixed income securities 7 35 84 55
Total $ 49 $ 71 $ 156 $ 119