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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Average Common Shares Outstanding Basic and Diluted        
Basic 343.8 347.2 344.1 348.8
Dilutive effect of stock options and restricted share unit awards 2.1 1.6 1.9 1.6
Diluted 345.9 348.8 346.0 350.4