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Share Repurchases (Tables)
6 Months Ended
Jul. 31, 2011
Share Repurchases  
Schedule Of Company's Share Repurchases

Share Repurchases

(millions, except per share data)

   Total Number of
Shares  Repurchased
   Average Price Paid per Share    Total Investment

Six months ended July 31, 2011

    65.4    $54.11    $3,540

Six months ended July 31, 2010

   135.6    $52.47    $7,112