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Share-Based Compensation Plans (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2011
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) 4,515,560
Options Outstanding, Weighted Average Remaining Contractual Life In Years 4.4
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 47.39
Options Exercisable (in shares) 2,146,035
Weighted Average Exercise Price of Options Exercisable $ 46.59
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) 24,000
Options Outstanding, Weighted Average Remaining Contractual Life In Years 3.4
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 18.31
Options Exercisable (in shares) 24,000
Weighted Average Exercise Price of Options Exercisable $ 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) 50,925
Options Outstanding, Weighted Average Remaining Contractual Life In Years 3.5
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 25.02
Options Exercisable (in shares) 50,925
Weighted Average Exercise Price of Options Exercisable $ 25.02
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) 790,675
Options Outstanding, Weighted Average Remaining Contractual Life In Years 4.5
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 33.90
Options Exercisable (in shares) 373,725
Weighted Average Exercise Price of Options Exercisable $ 34.11
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) 1,620,435
Options Outstanding, Weighted Average Remaining Contractual Life In Years 4.0
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 43.68
Options Exercisable (in shares) 913,635
Weighted Average Exercise Price of Options Exercisable $ 44.36
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) 1,963,525
Options Outstanding, Weighted Average Remaining Contractual Life In Years 4.7
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 56.25
Options Exercisable (in shares) 717,750
Weighted Average Exercise Price of Options Exercisable $ 56.80
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 5.9
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 $ 64.03