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Share-based Compensation Plans (Tables)
12 Months Ended
Dec. 31, 2012
Share-based compensation plans [Abstract]  
Option Activity [Table Text Block]
          Weighted-Average Aggregate 
    Shares Weighted- Average Remaining Contractual Intrinsic Value 
   (in thousands) Exercise Price Per Share Term (in years) (in millions) 
                
 Outstanding at December 31, 2009  3,435 $ 28.98        
 Granted  367   19.05        
 Exercised  (372)   17.50        
 Forfeited or expired  (75)   31.71        
                
 Outstanding at December 31, 2010  3,355   29.10        
 Granted  290   31.47        
 Exercised  (562)   20.66        
 Forfeited or expired  (116)   29.47        
               
 Outstanding at December 31, 2011  2,967   30.92        
 Granted  396   22.55        
 Exercised  (71)   19.04        
 Forfeited or expired   (680)   29.92        
 Outstanding at December 31, 2012             
    2,612 $ 30.23   2.4 $ 5.3  
                
 Of the above, as of December 31, 2012:             
  Exercisable  1,974 $ 32.15   1.6 $ 2.2  
  Expected to vest in future periods (a)  610 $ 24.37   4.9 $ 3.0  
Fair value of options calculation assumptions [Table Text Block]
     Years Ended December 31,
   2012 2011 2010 
                 
 Number of shares underlying options, in thousands     396    290    367 
 Weighted-average exercise price per share $   22.55    31.47    19.05 
                 
 Assumptions used to estimate fair value             
  Expected dividend yield (a):             
   Weighted-average    1.8%    1.3%    2.1% 
  Expected volatility (b):             
   Weighted-average     40%    36%    36% 
   Range  39%– 40%  36%– 37%  35%– 39% 
  Risk-free interest rate (c):             
   Weighted-average     0.6%    1.2%    1.4% 
   Range  0.4%– 0.9%  0.5%– 1.9%  0.6%– 1.9% 
  Expected term in years (d):             
   Weighted-average     4.3    3.8    3.8 
   Range  3.3– 5.3  1.9– 5.3  1.9– 5.3 
                 
 Weighted-average fair value estimates at grant date:             
  In millions$   2.5    2.4    1.7 
  Fair value per share$   6.32    8.17    4.65 
Nonvested share activity [Table Text Block]
 Nonvested Share Activity             
   Number of shares  Weighted-Average 
   2005 Directors’     Grant-Date 
 (in thousands of shares, except per share amounts) Plan Plan Total Fair Value (a) 
                
 Balance as of January 1, 2010  214.2   22.7   236.9 $ 28.45  
 Granted  167.6   29.1   196.7   19.24  
 Cancelled awards  (5.6)   -   (5.6)   22.52  
 Vested  (76.7)   (22.7)   (99.4)   29.12  
  Balance as of December 31, 2010  299.5   29.1   328.6   22.84  
                
 Granted  143.7   15.8   159.5   30.43  
 Cancelled awards  (16.5)   -   (16.5)   23.65  
 Vested  (127.1)   (29.1)   (156.2)   24.13  
  Balance as of December 31, 2011  299.6   15.8   315.4   25.99  
                
 Granted  321.0   23.0   344.0   22.21  
 Cancelled awards  (21.3)   -   (21.3)   24.53  
 Vested  (191.4)   (15.8)   (207.2)   25.68  
  Balance as of December 31, 2012  407.9   23.0   430.9 $ 23.19