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Shareholders' Equity (Tables)
6 Months Ended
Jun. 30, 2012
Shareholders' Equity  
Schedule of Assumptions Used to Calculate Fair Value of Options Granted
    Six Months Ended June 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
   Six Months Ended June 30, 2012 
     Wtd. Avg. 
     Exercise 
   Options Price 
        
 Outstanding at beginning of period 45,384,554 $ 34.42 
  Granted 4,683,073   30.09 
  Exercised (535,124)   23.58 
  Forfeited or expired (3,117,095)   36.63 
 Outstanding at end of period 46,415,408   33.95 
 Exercisable at end of period 34,992,955   35.81 
 Exercisable and expected to vest at end of period 44,470,125 $ 33.97 
Restricted Shares and Restricted Share Units Activity Roll Forward
       Six Months Ended June 30, 2012 
         Wtd. Avg. 
         Grant Date 
       Shares/Units Fair Value 
 Nonvested at beginning of period 13,462,630 $ 19.47 
  Granted 2,580,306   25.81 
  Vested (1,547,360)   32.30 
  Forfeited (213,814)   18.95 
 Nonvested at end of period 14,281,762 $ 19.23