Benefit Obligations - Schedule of Net Periodic Benefit Costs Recognized (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 Disclosure [Line Items]
Service cost	$ 3	$ 3	$ 10	$ 10
Interest cost	30	31	90	94
Expected return on plan assets	(32)	(34)	(96)	(102)
Total	1	0	4	2
Post-retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	1	0	1
Interest cost	0	0	1	1
Expected return on plan assets	0	0	0	0
Total	$ 0	$ 1	$ 1	$ 2