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Share-based Compensation Plans (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares available for grant 42,900    
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting percentage 33.33%    
Shares outstanding 4,600    
Number of units      
Outstanding non-vested at December 31 (in shares) 4,600    
Performance Share Units (PSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares outstanding 1,000    
Number of units      
Outstanding non-vested at December 31 (in shares) 1,000    
Restricted Stock Units (RSUs) and Performance Share Units (PSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares outstanding 4,568 5,109  
Share-based payment arrangement, expense $ 140 $ 80 $ 67
Number of units      
Outstanding non-vested at January 1 (in shares) 5,109    
Modified awards to settle in cash (in shares) (493)    
Granted (in shares) 3,275    
Vested (in shares) (2,999)    
Forfeited (in shares) (324)    
Outstanding non-vested at December 31 (in shares) 4,568 5,109  
Weighted-average grant date fair value per share      
Outstanding non-vested at January 1 (in dollars per share) $ 29.73    
Modified awards to settle in cash (in dollars per share) 28.90    
Granted (in dollars per share) 40.87    
Vested (in dollars per share) 31.52    
Forfeited (in dollars per share) 34.74    
Outstanding non-vested at December 31 (in dollars per share) $ 36.27 $ 29.73