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Share-Based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense $ 49 $ 44 $ 134 $ 130  
Deferred compensation costs related to unvested awards $ 372   $ 372   $ 176
RSUs and PSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock awards, weighted average grant-date fair value (in USD per share)     $ 101    
RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock awards, granted (in shares)     3.4    
Stock awards, vesting period     4 years    
Stock awards, period of service after grant date     1 year    
PSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock awards, granted (in shares)     0.1    
Stock awards, period of service after grant date     3 years