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Equity and Share-Based Compensation (Recognized Share-Based Compensation Expense) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Recognized share-based compensation expense $ 282 $ 271 $ 589 $ 495
Restricted Share Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Recognized share-based compensation expense 185 179 391 320
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Recognized share-based compensation expense 89 83 178 154
Employee Stock Purchase Plans [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Recognized share-based compensation expense $ 9 $ 9 $ 20 $ 21