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Pension and Other Post-Retirement Benefits - Schedule of Net Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Pension Benefits        
Components of net periodic pension expense (credit)        
Interest cost $ 1 $ 2 $ 2 $ 3
Expected return on plan assets (4) (3) (8) (7)
Amortization of net actuarial loss 1 1 2 3
Net periodic (credit) expense (2) 0 (4) (1)
Post- Retirement Benefits        
Components of net periodic pension expense (credit)        
Interest cost 0 0 0 0
Expected return on plan assets 0 0 0 0
Amortization of net actuarial loss 0 0 0 0
Net periodic (credit) expense $ 0 $ 0 $ 0 $ 0