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Earnings Per Share (Average Common Shares Outstanding Basic And Diluted) (Details) - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Average Common Shares Outstanding Basic and Diluted        
Basic 347.2 352.7 348.8 354.4
Dilutive effect of stock options and restricted share unit awards 1.6 2.1 1.6 2.3
Diluted 348.8 354.8 350.4 356.7