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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Average Common Shares Outstanding Basic and Diluted        
Basic 337.3 340.9 337.8 341.1
Dilutive effect of stock options and restricted share unit awards 1.0 1.0 1.0 1.2
Diluted 338.3 341.9 338.8 342.3