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Income Per Common Share - Anti-dilutive Shares (Details) (Stock Compensation Plan)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Stock Compensation Plan
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Shares issued under stock-based compensation plans 0 1 0 1