Pension Benefits (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Components of net periodic pension expense (income)
Interest cost	$ 1	$ 1	$ 3	$ 2
Expected return on plan assets	(4)	(4)	(8)	(8)
Amortization of net actuarial loss	1	1	2	2
Net periodic expense (income)	$ (2)	$ (2)	$ (3)	$ (4)