Pension and Other Postretirement Benefits - Schedule of Pension, Postretirement and Supplemental Retirement Plans (Details) - USD ($) $ in Millions	1 Months Ended		12 Months Ended
	Jun. 30, 2024	Apr. 30, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Change in plan assets:
Plan assets transferred to an insurance company		$ 24
Terminated Vested Participants
Change in plan assets:
Benefits paid	$ (8)
Defined Benefit Pension Plans
Change in benefit obligation:
Benefit obligation at beginning of year			$ 165	$ 162
Interest cost			7	8	$ 6
Actuarial (gain) loss			(4)	6
Benefits paid			(41)	(12)
Loss due to settlement			0	1
Benefit obligation at end of year			127	165	162
Change in plan assets:
Fair value of plan assets at beginning of year			134	124
Actual return on plan assets			0	12
Employer contributions			7	10
Benefits paid			(41)	(12)
Fair value of plan assets at end of year			100	134	124
Funded status of the plans at year end			(27)	(31)
Postretirement Benefit Plans
Change in benefit obligation:
Benefit obligation at beginning of year			1	1
Interest cost			0	0	0
Actuarial (gain) loss			0	0
Benefits paid			0	0
Loss due to settlement			0	0
Benefit obligation at end of year			1	1	1
Change in plan assets:
Fair value of plan assets at beginning of year			1	1
Actual return on plan assets			0	0
Employer contributions			0	0
Benefits paid			0	0
Fair value of plan assets at end of year			1	1	1
Funded status of the plans at year end			0	0
Supplemental Retirement Plans
Change in benefit obligation:
Benefit obligation at beginning of year			17	17
Interest cost			1	1	1
Actuarial (gain) loss			0	0
Benefits paid			(1)	(1)
Loss due to settlement			0	0
Benefit obligation at end of year			17	17	17
Change in plan assets:
Fair value of plan assets at beginning of year			12	11
Actual return on plan assets			1	1
Employer contributions			1	1
Benefits paid			(1)	(1)
Fair value of plan assets at end of year			13	12	$ 11
Funded status of the plans at year end			$ (4)	$ (5)