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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Earnings Per Share [Abstract]        
Anti-dilutive equity instruments excluded from the computation of diluted earnings per share (in shares) 3.7 3.1 3.4 1.9