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Share Repurchases (Tables)
9 Months Ended
Oct. 31, 2011
Share Repurchases [Abstract]  
Schedule Of Company's Share Repurchases

Share Repurchases

(Amounts in millions, except per share data)

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

Nine months ended October 31, 2011

     92.4       $ 53.61       $ 4,957   

Nine months ended October 31, 2010

     209.3       $ 52.44       $ 10,972