Pension Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Components of net periodic pension expense (income)
Interest cost	$ 1	$ 1
Expected return on plan assets	(4)	(4)
Amortization of net actuarial loss	1	1
Net periodic expense (income)	$ (2)	$ (2)