Benefit Plans - Schedule of Changes in and Amount of Accumulated Postretirement Benefit Obligation (Details) - Postretirement Benefit Plan - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Accumulated postretirement benefit obligation as of January 1	$ 34	$ 48
Service cost	0	1
Interest cost	2	1
Benefits paid	(2)	(2)
Actuarial gains	(18)	(14)
Accumulated postretirement benefit obligation as of December 31	$ 16	$ 34