Pension and Other Post-Retirement Benefits - Schedule of Net Benefit Costs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Pension Benefits
Components of net periodic pension expense (credit):(1)
Interest cost	$ 2	$ 1	$ 3	$ 2
Expected return on plan assets	(3)	(4)	(7)	(8)
Amortization of net actuarial loss	1	1	3	1
Net periodic (credit) expense	0	(2)	(1)	(5)
Post Retirement Benefits (2)
Components of net periodic pension expense (credit):(1)
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