Retirement Plans - Schedule of Components of Net Periodic Benefit Cost (Details) - Pension Plan - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Components of net periodic benefit cost
Interest cost	$ 9	$ 8	$ 25	$ 25
Expected return on plan assets	(9)	(8)	(25)	(24)
Amortization of unrecognized:
Actuarial (gain) loss	2	3	8	9
Net periodic benefit cost	$ 2	$ 3	$ 8	$ 10