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Stock-Based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for grant 8,510,923   8,510,923  
Shares granted     3,131,949  
Shares granted, weighted average grant date fair value     $ 11.20  
Four Zero One K Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Employer Discretionary Contribution Amount $ 2 $ 2 $ 5 $ 4
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted     3,131,949 2,411,345
Shares granted, weighted average grant date fair value     $ 11.20 $ 11.62
Compensation and benefits expense 7 8 $ 22 $ 23
Unrecognized compensation cost relating to unvested restricted stock 63   $ 63  
Unrecognized compensation cost relating to unvested restricted stock, recognition period (in years)     3 years 1 month 6 days  
Restricted Stock | Share-based Payment Arrangement, Tranche One        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted, vesting period     1 year 1 year
Restricted Stock | Share-based Payment Arrangement, Tranche Two        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted, vesting period     5 years 5 years
Performance-Based Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted     356,740  
Compensation and benefits expense 1 $ 1 $ 2 $ 2
Unrecognized compensation cost relating to unvested restricted stock $ 5   $ 5  
Unrecognized compensation cost relating to unvested restricted stock, recognition period (in years)     1 year 8 months 12 days