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Share-Based Compensation - Performance Share Units (Details) - Performance share units - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation      
Performance period 3 years    
Service condition period 3 years    
Number of shares for each target PSU 1    
Value of shares settled for awards $ 47 $ 34 $ 19
Minimum      
Share-based Compensation      
Percentage of award earned 0.00%    
Target      
Share-based Compensation      
Awards outstanding 400,000 400,000 400,000
Prior to 2018 | Maximum      
Share-based Compensation      
Percentage of award earned 200.00%    
2018 or later | Maximum      
Share-based Compensation      
Percentage of award earned 175.00%