Retirement Plans - Schedule of Components of Net Periodic Benefit Cost (Details) - Pension Plan - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Components of net periodic benefit cost
Interest cost	$ 8	$ 8
Expected return on plan assets	(8)	(8)
Amortization of unrecognized:
Actuarial (gain) loss	3	3
Net periodic benefit cost	$ 3	$ 3