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Stock-Based Compensation - Restricted Stock Units (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Restricted stock units    
Stock-based compensation    
Granted (in shares) 635,840 394,970
Granted (in dollars per share) $ 56 $ 47
Forfeited (in shares) 8,789 4,760
unrecognized compensation expense $ 23 $ 10
Weighted average remaining vesting period 2 years 3 years
Shares issued in period (in shares) 126,295  
Total market value (at the vesting date) of stock award shares $ 7  
Stock options    
Stock-based compensation    
Weighted average remaining vesting period 2 years 3 years
Performance Restricted Stock Units    
Stock-based compensation    
Period for recognition 3 years  
LTIP Program | Performance Restricted Stock Units    
Stock-based compensation    
Granted (in shares) 85,360 133,390
Granted (in dollars per share) $ 53 $ 34
Forfeited (in shares) 0  
Shares issued in period (in shares) 104,757 151,724