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Shareholders' Equity (Tables)
9 Months Ended
Sep. 30, 2012
Shareholders' Equity  
Schedule of Assumptions Used to Calculate Fair Value of Options Granted
    Nine Months Ended September 30, 
    2012 2011 
            
 Assumptions:        
  Risk-free interest rate  1.5%   1.7% 
  Dividend yield  4.4    3.5  
  Volatility factor  33.0    37.2  
  Expected life  7.0yrs   7.4yrs 
 Fair value of options per share$ 6.07  $ 7.45  
Stock Options Activity Roll Forward
     Wtd. Avg. 
     Exercise 
   Options Price 
        
 Outstanding at January 1, 2012 45,384,554 $ 34.42 
  Granted 4,683,073   30.09 
  Exercised (1,208,481)   23.56 
  Forfeited or expired (3,258,133)   36.46 
 Outstanding at September 30, 2012 45,601,013   34.12 
 Exercisable at September 30, 2012 34,274,139   36.05 
 Exercisable and expected to vest at September 30, 2012 44,420,189 $ 34.27 
Restricted Shares and Restricted Share Units Activity Roll Forward
         Wtd. Avg. 
         Grant Date 
       Shares/Units Fair Value 
 Nonvested at January 1, 2012 13,462,630 $ 19.47 
  Granted 2,580,306   25.81 
  Vested (1,652,869)   31.38 
  Forfeited (277,376)   19.16 
 Nonvested at September 30, 2012 14,112,691 $ 19.24