Benefit Obligations - Schedule of Net Periodic Benefit Costs Recognized (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3	$ 4
Interest cost	27	29
Expected return on plan assets	(32)	(32)
Total	(2)	1
Post-retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	0	1
Expected return on plan assets	0	0
Total	$ 0	$ 1