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, 2025	Dec. 31, 2024
Net Actuarial Gain
Accumulated postretirement benefit obligation as of January 1	$ 15	$ 16
Service cost	0	0
Interest cost	1	1
Benefits paid	(1)	(2)
Actuarial gains	(1)	0
Accumulated postretirement benefit obligation as of December 31	$ 14	$ 15