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Share Repurchase Programs (Tables)
6 Months Ended
Jun. 30, 2011
Share Repurchase Programs [Abstract]  
Share Repurchase Program
                 
                Number of
    Amount         Shares
Authorized   Authorized     Completed   Repurchased
    (In millions)         (In millions)
July 2008
  $ 400     October 2008   5.9
May 2009
    250     July 2009   3.7
July 2009
    750     January 2010   9.7
February 2010
    250     May 2010   3.3
August 2010 *
    1,400         12.8
 
             
Total
  $ 3,050         35.4
 
             
 
*   As amended on May 19, 2011