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Earnings Per Share (Antidilutive Shares) (Details) (Options and performance shares)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Options and performance shares
     
Antidilutive securities excluded from computation of earnings per share      
Shares not included in diluted earnings per share 1.9 3.1 2.8