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Earnings Per Share (Average Common Shares Outstanding Basic And Diluted) (Details) - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Average Common Shares Outstanding Basic and Diluted        
Basic 359.2 363.9 360.0 364.5
Diluted 361.5 366.2 362.4 366.9
Equity Option        
Average Common Shares Outstanding Basic and Diluted        
Dilutive effect of stock options and restricted share unit awards 2.3 2.3 2.4 2.4