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Share-Based Compensation Plans (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2012
Y
Stock Option Plans  
Range of exercise price, lower limit (in dollars per share) $ 15
Range of exercise price, upper limit (in dollars per share) $ 67
Options Outstanding (in shares) 3,405,500
Options Outstanding, Weighted Average Remaining Contractual Life In Years 3.6
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 49.12
Options Exercisable (in shares) 2,028,387
Weighted Average Exercise Price of Options Exercisable (in dollars per share) $ 49.67
Range of Exercise Price $15 - $19
  
Stock Option Plans  
Range of exercise price, lower limit (in dollars per share) $ 15
Range of exercise price, upper limit (in dollars per share) $ 19
Options Outstanding (in shares) 18,000
Options Outstanding, Weighted Average Remaining Contractual Life In Years 2.4
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 18.31
Options Exercisable (in shares) 18,000
Weighted Average Exercise Price of Options Exercisable (in dollars per share) $ 18.31
Range of Exercise Price $24 - $28
  
Stock Option Plans  
Range of exercise price, lower limit (in dollars per share) $ 24
Range of exercise price, upper limit (in dollars per share) $ 28
Options Outstanding (in shares) 21,180
Options Outstanding, Weighted Average Remaining Contractual Life In Years 2.5
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 25.17
Options Exercisable (in shares) 21,180
Weighted Average Exercise Price of Options Exercisable (in dollars per share) $ 25.17
Range of Exercise Price $33 - $38
  
Stock Option Plans  
Range of exercise price, lower limit (in dollars per share) $ 33
Range of exercise price, upper limit (in dollars per share) $ 38
Options Outstanding (in shares) 446,450
Options Outstanding, Weighted Average Remaining Contractual Life In Years 3.6
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 34.05
Options Exercisable (in shares) 247,275
Weighted Average Exercise Price of Options Exercisable (in dollars per share) $ 34.33
Range of Exercise Price $42 - $45
  
Stock Option Plans  
Range of exercise price, lower limit (in dollars per share) $ 42
Range of exercise price, upper limit (in dollars per share) $ 45
Options Outstanding (in shares) 1,055,235
Options Outstanding, Weighted Average Remaining Contractual Life In Years 3.5
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 43.44
Options Exercisable (in shares) 604,085
Weighted Average Exercise Price of Options Exercisable (in dollars per share) $ 43.91
Range of Exercise Price $55 - $57
  
Stock Option Plans  
Range of exercise price, lower limit (in dollars per share) $ 55
Range of exercise price, upper limit (in dollars per share) $ 57
Options Outstanding (in shares) 1,798,635
Options Outstanding, Weighted Average Remaining Contractual Life In Years 3.7
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 56.23
Options Exercisable (in shares) 1,071,847
Weighted Average Exercise Price of Options Exercisable (in dollars per share) $ 56.58
Range of Exercise Price $61 - $67
  
Stock Option Plans  
Range of exercise price, lower limit (in dollars per share) $ 61
Range of exercise price, upper limit (in dollars per share) $ 67
Options Outstanding (in shares) 66,000
Options Outstanding, Weighted Average Remaining Contractual Life In Years 4.9
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 64.03
Options Exercisable (in shares) 66,000
Weighted Average Exercise Price of Options Exercisable (in dollars per share) $ 64.03