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Earnings Per Share (Average Common Shares Outstanding Basic And Diluted) (Details) - shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Average Common Shares Outstanding Basic and Diluted        
Basic 348.8 354.4 349.6 355.2
Dilutive effect of stock options and restricted share unit awards 1.5 2.3 1.7 2.4
Diluted 350.3 356.7 351.3 357.6