Retirement Plans and Other Employee Benefits - Schedule of Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 32	$ 33	$ 20
Expected return on plan assets	(32)	(32)	(24)
Actuarial (gain) loss	13	13	12
Net periodic benefit cost	13	14	8
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost	2	2	1
Expected return on plan assets	(1)	(1)	(2)
Actuarial (gain) loss	(1)	(1)	0
Net periodic benefit cost	$ 0	$ 0	$ (1)