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Share-based Compensation (Awards Granted and Converted During Period) (Details)
shares in Millions
3 Months Ended
Mar. 31, 2021
$ / shares
shares
PRSUs  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards granted, Awards (in shares) | shares 0.2
Awards granted, weighted-average grant price (in dollars per share) | $ / shares $ 58.18
RSUs  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards granted, Awards (in shares) | shares 2.5
Awards granted, weighted-average grant price (in dollars per share) | $ / shares $ 57.68
Stock options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock options, granted (in shares) | shares 0.7
Stock options, weighted-average grant price (in dollars per share) | $ / shares $ 58.18