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Earnings Per Common Share, Potentially Dilutive Securities (Details) (Stock Options [Member])
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Stock Options [Member]
   
Antidilutive Securities Excluded from Computation of Earnings Per Common Share    
Amount of potentially dilutive securities excluded from computation of earnings per common share 1 3