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Earnings Per Share (Average Common Shares Outstanding Basic And Diluted) (Details) - shares
shares in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Average Common Shares Outstanding Basic and Diluted    
Basic 337.0 338.2
Dilutive effect of stock options and restricted share unit awards 1.2 1.2
Diluted 338.2 339.4