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Earnings Per Share (Anti-Dilutive Equity Instruments Excluded From The Computation Of Diluted Earnings Per Share) (Details) - shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share [Abstract]        
Anti-dilutive equity instruments excluded from the computation of diluted earnings per share (in shares) 2.3 3.7 1.9 3.4