v3.7.0.1
Earnings Per Common Share (Dilutive Shares Excluded From Calculatin Of Earnings Per Share) (Details) - shares
shares in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Earnings Per Common Share [Abstract]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 6 4