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Earnings Per Share (Anti-Dilutive Options Excluded From The Computation Of Diluted Earnings Per Share) (Details) - shares
shares in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Earnings Per Share [Abstract]    
Anti-dilutive options excluded from the computation of diluted earnings per share (in shares) 3.1 2.5