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Earnings Per Share (Average Common Shares Outstanding Basic And Diluted) (Details) - shares
shares in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Average Common Shares Outstanding Basic and Diluted    
Basic 350.4 356.0
Dilutive effect of stock options and restricted share unit awards 2.2 2.6
Diluted 352.6 358.6