Pension and Other Post-Retirement Benefits - Pension and Post-Retirement Plans (Details) - Pension Benefits - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Components of net periodic pension expense (credit):
Interest cost	$ 1	$ 1	$ 3	$ 3
Expected return on plan assets	(4)	(4)	(12)	(12)
Amortization of net actuarial loss	1	2	2	5
Net periodic (credit) expense	$ (2)	$ (1)	$ (7)	$ (4)