Retirement Plans - Schedule of Components of Net Periodic Benefit Cost (Details) - Pension Plan - 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 benefit cost
Interest cost	$ 8	$ 9	$ 16	$ 17
Expected return on plan assets	(8)	(8)	(16)	(16)
Amortization of unrecognized:
Actuarial (gain) loss	3	3	6	6
Net periodic benefit cost	$ 3	$ 4	$ 6	$ 7