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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Average Common Shares Outstanding Basic and Diluted        
Basic 360.0 364.3 360.4 364.7
Diluted 362.4 366.7 362.9 367.3
Equity Option        
Average Common Shares Outstanding Basic and Diluted        
Dilutive effect of stock options and restricted share unit awards 2.4 2.4 2.5 2.6