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Stock-Based Compensation - Restricted Stock Units (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Restricted stock units    
Stock-based compensation    
Granted (in shares) 660,980 432,170
Shares issued in period (in shares) 137,995  
Forfeited (in shares) 13,330 5,870
Granted (in dollars per share) $ 57 $ 47
Unrecognized compensation expense $ 20 $ 9
Weighted average remaining vesting period 2 years  
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
Shares issued in period (in shares) 104,757 151,724
Forfeited (in shares) 0  
Granted (in dollars per share) $ 53 $ 34