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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Average Common Shares Outstanding Basic and Diluted        
Basic 354.4 360.0 355.2 360.4
Dilutive effect of stock options and restricted share unit awards 2.3 2.4 2.4 2.5
Diluted 356.7 362.4 357.6 362.9