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Share-Based Compensation - Schedule of Performance Shares Award Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Restricted stock units (RSUs) [member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding, ending balance 1,246 1,493  
Number of shares granted 589 942 963
Vested (760)    
Forfeited (76)    
Weighted average grant date fair value, outstanding beginning balance $ 88.55    
Weighted average grant date fair value per share, granted 123.13 $ 93.48 $ 83.47
Weighted average grant date fair value, vested 86.66    
Weighted average grant date fair value, forfeited or canceled 100.94    
Weighted average grant date fair value, outstanding ending balance $ 105.28 $ 88.55  
Aggregate intrinsic value of shares vested $ 94 $ 97 $ 92
Performance shares [member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding, ending balance 848 1,020  
Number of shares granted 241 348 [1] 384 [1]
Vested (391)    
Forfeited (22)    
Weighted average grant date fair value, outstanding beginning balance $ 84.57    
Weighted average grant date fair value per share, granted 123.13 $ 93.33 [1] $ 83.11 [1]
Weighted average grant date fair value, vested 79.42    
Weighted average grant date fair value, forfeited or canceled 94.55    
Weighted average grant date fair value, outstanding ending balance $ 97.63 84.57  
Performance achievement shares modified, modification date fair value per share [1]   $ 102.95  
Aggregate intrinsic value of shares vested $ 36 $ 58 $ 0
[1] In December 2020, 288,000 and 340,000 performance shares from the 2020 grant and 2019 grant, respectively, were modified, as discussed above, with a modification date fair value per share of $102.95.