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Earnings Per Common Share, Potentially Dilutive Securities (Details) (Stock Options [Member])
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
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 3 6 3 6