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Employee Benefit Plans - Pension Plans (Details) - Pension Plan - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2001
Dec. 31, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Consecutive months with highest compensation in which benefits are based 60 months  
Months ending at retirement or termination in which benefits are based 120 months  
Discount rate   4.67%
Benefit obligation   $ 64
Fair value of plan assets   $ 54