Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Pension Benefits
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost		$ 1	$ 1	$ 2
Interest cost	12	23	34	72
Expected return on plan assets	(16)	(29)	(46)	(88)
Amortization of unrecognized net loss	2	7	6	22
Settlements		4	1	4
Net periodic (benefit) cost	(2)	6	(4)	12
Other Postretirement Benefits
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Interest cost			1	1
Expected return on plan assets	(1)	(1)	(2)	(2)
Amortization of unrecognized net loss		1		1
Net periodic (benefit) cost	$ (1)	$ 0	$ (1)	$ 0