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Shareholders' Equity (Tables)
9 Months Ended
Sep. 30, 2013
Shareholders' Equity  
Schedule of Assumptions Used to Calculate Fair Value of Options Granted
    Nine Months Ended September 30, 
    2013 2012 
            
 Weighted average assumptions:        
  Risk-free interest rate  1.3%   1.5% 
  Dividend yield  3.6    4.4  
  Volatility factor  28.0    33.0  
  Expected life  7.0yrs   7.0yrs 
 Fair value of options per share$ 5.48  $ 6.07  
Stock Options Activity Roll Forward
     Wtd. Avg. 
     Exercise 
   Options Price 
        
 Outstanding at January 1, 2013 45,391,074 $ 34.15 
  Granted 403,720   30.08 
  Exercised (2,363,379)   26.22 
  Forfeited or expired (4,243,943)   32.83 
 Outstanding at September 30, 2013 39,187,472   34.73 
        
 Exercisable at September 30, 2013 32,429,855   36.09 
        
 Exercisable and expected to vest at September 30, 2013 38,663,225 $ 34.83 
Restricted Shares and Restricted Share Units Activity Roll Forward
     Wtd. Avg. 
   RestrictedGrant Date 
   Shares/Units Fair Value 
 Nonvested at January 1, 2013 13,930,824 $ 19.26 
  Granted 3,964,954   25.59 
  Vested (2,273,217)   22.26 
  Forfeited (249,128)   20.13 
 Nonvested at September 30, 2013 15,373,433 $ 20.43