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Share Repurchase Programs (Tables)
12 Months Ended
Dec. 31, 2011
Share Repurchase Programs [Abstract]  
Share Repurchase Program
                 

Program

  Amount
Authorized
    Number of
Shares
Repurchased
 
    (In millions)     (In millions)  

July 2008 - October 2008

  $ 400       5.9  

May 2009 - July 2009

    250       3.7  

July 2009 - January 2010

    750       9.7  

February 2010 - May 2010

    250       3.3  

August 2010* - August 2011

    1,400       15.0  

August 2011 -

    750       5.1  
   

 

 

   

 

 

 

Total

  $ 3,800       42.7  
   

 

 

   

 

 

 

 

* As amended on May 19, 2011