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Share-Based Compensation Plans - Summary of outstanding share-settled LTI awards (Details) - Performance Shares - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Long Term Incentive Plan 2023    
Number of Units    
Unvested, beginning of year (in shares) 0  
Granted (in shares) 2,752,390  
Vested (in shares) (876,285)  
Forfeited (in shares) (141,136)  
Unvested, end of year (in shares) 1,734,969 0
Weighted Average Grant-Date Fair Value    
Unvested, beginning of year (in dollars per share) $ 0  
Granted (in dollars per share) 59.98  
Vested (in dollars per share) 59.92  
Forfeited (in dollars per share) 59.88  
Unvested, end of year (in dollars per share) $ 60.02 $ 0
Long Term Incentive Plan 2022    
Number of Units    
Unvested, beginning of year (in shares) 2,280,431  
Granted (in shares) 0  
Vested (in shares)   (969,438)
Forfeited (in shares)   (202,840)
Unvested, end of year (in shares) 1,108,153 2,280,431
Weighted Average Grant-Date Fair Value    
Unvested, beginning of year (in dollars per share) $ 61.86  
Granted (in dollars per share) 0  
Vested (in dollars per share) 61.75  
Forfeited (in dollars per share) 61.93  
Unvested, end of year (in dollars per share) $ 61.95 $ 61.86
Long Term Incentive Plan 2021    
Number of Units    
Unvested, beginning of year (in shares) 2,696,264  
Granted (in shares) 0  
Vested (in shares) (689,706)  
Forfeited (in shares) (278,707)  
Unvested, end of year (in shares) 1,727,851 2,696,264
Weighted Average Grant-Date Fair Value    
Unvested, beginning of year (in dollars per share) $ 45.40  
Granted (in dollars per share) 0  
Vested (in dollars per share) 45.97  
Forfeited (in dollars per share) 45.85  
Unvested, end of year (in dollars per share) $ 45.08 $ 45.40
Long Term Incentive Plans    
Weighted Average Grant-Date Fair Value    
Share-based compensation expense - pre-tax, not yet recognized $ 111  
Vesting period (in years) 1 year 3 days  
Share-based compensation expense, expected period for amortization 3 years