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Earnings Per Share (Tables) (Unaudited)
9 Months Ended
Sep. 30, 2011
EARNINGS PER SHARE [Abstract] 
Share Repurchases
                                                 
                            Shares Repurchased
(in millions)		  
Repurchase Program
Authorization Date		   Amount
Authorized
(in millions)		     Average Price
Per Share (2)		    

Total

Shares Retired

(in millions)

     Date Completed     Nine Months Ended
September 30		  
          2011     2010  

 

  

December 19, 2007

     $3,600       $59.82       60.2       August 2010               15.7  

June 16, 2010 (1)

     4,245       58.24       32.4               28.4       2.1  
                                      28.4       17.8