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Stock-Based Compensation (Stock Options Activity) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Stock Options Activity [Roll Forward]      
Options outstanding, Beginning 2.9 2.9 2.7
Granted 0.6 0.5 0.6
Exercised (0.7) (0.4) (0.3)
Forfeited 0 (0.1) (0.1)
Options outstanding, Ending 2.8 2.9 2.9
Stock Options, Weighted Average Exercise Price [Roll Forward]      
Options outstanding, Beginning (in usd per share) $ 35.76 $ 32.32 $ 29.09
Granted (in usd per share) $ 42.94 $ 40.85 $ 42.47
Exercised (in usd per share) $ 26.23 $ 17.69 $ 14.88
Forfeited (in usd per share) $ 40.75 $ 39.69 $ 41.47
Options outstanding, Ending (in usd per share) $ 39.67 $ 35.76 $ 32.32
Stock Options, Additional Disclosures      
Options exercisable 1.5 1.8 1.8
Options exercisable (in usd per share) $ 38.02 $ 32.91 $ 27.77