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Share-Based Compensation (Stock Options and Restricted Share Units) (Details)
shares in Millions
12 Months Ended
Dec. 31, 2019
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock options granted (in shares) 42
Weighted-average exercise price of awards granted during the year (in dollars per share) | $ / shares $ 40.50
Stock options outstanding (in shares) 192
Weighted-average exercise price of shares outstanding (in dollars per share) | $ / shares $ 31.84
Restricted share units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards granted (in shares) 17
Awards nonvested (in shares) 51
Weighted-average fair value at grant date of nonvested awards (in dollars per share) | $ / shares $ 36.54