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Employee Benefits - Restricted Stock Units - Additional Information (Details) - Restricted Stock Units (RSUs) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Share Based Compensation      
Fair value of restricted stock units vested $ 2 $ 3 $ 2
Minimum      
Share Based Compensation      
Age and period of service of the participant to be eligible for retirement 75 years    
Employees      
Share Based Compensation      
Award vesting period 3 years    
Directors      
Share Based Compensation      
Award vesting period 1 year