Benefit Obligations - Schedule of Net Periodic Benefit Costs Recognized (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3	$ 3	$ 8	$ 10
Interest cost	27	30	82	90
Expected return on plan assets	(32)	(32)	(97)	(96)
Amortization of prior service cost (credit)	0	0	(1)	0
Total	(2)	1	(8)	4
Post-retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	0	0	1	1
Expected return on plan assets	0	0	0	0
Amortization of prior service cost (credit)	0	0	0	0
Total	$ 0	$ 0	$ 1	$ 1