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Stock-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Restricted stock units | Executives      
Stock-Based Plans      
Granted (in shares) 367,380 545,527  
Granted, weighted average grant date fair value (in dollars per share) $ 21.90 $ 18.13  
Vesting period ( in years ) 3 years 3 years  
Stock options      
Stock-Based Plans      
Vesting period ( in years ) 3 years    
Expiration period (in years) 10 years    
Stock options | Executives      
Stock-Based Plans      
Options granted (in shares) 250,656 481,626  
Options granted weighted-average exercise price, per share (in dollars per share) $ 21.90 $ 17.96  
Performance-based awards | Executives      
Stock-Based Plans      
Granted (in shares) 426,957 613,868  
Vesting period ( in years ) 3 years    
Post-vest holding period ( in years ) 3 years    
Liabilities associated with SGI awards $ 57   $ 73
Performance-based awards | Executives | General and Administrative Expense      
Stock-Based Plans      
Share-based compensation expense $ 10 $ 32