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Pension and Other Post-Retirement Benefits - Schedule of Net Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Pension Benefits    
Components of net periodic pension expense (credit)    
Interest cost $ 1 $ 1
Expected return on plan assets (4) (4)
Amortization of net actuarial loss 1 2
Net periodic (credit) expense (2) (1)
Post- Retirement Benefits    
Components of net periodic pension expense (credit)    
Interest cost 0 0
Expected return on plan assets 0 0
Amortization of net actuarial loss 0 0
Net periodic (credit) expense $ 0 $ 0