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Pension and Other Postretirement Healthcare Benefits - Schedule of Components of Net Periodic Pension and Postretirement Healthcare Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Pensions      
Net periodic cost:      
Service cost $ 3 $ 4 $ 3
Interest cost 18 17 18
Expected return on plan assets (19) (20) (20)
Net amortization of actuarial loss 1 1 0
Total net periodic cost 3 2 1
Other Post Retirement Benefit Plans      
Net periodic cost:      
Service cost 1 1 1
Interest cost 2 2 2
Expected return on plan assets 0 0 0
Net amortization of actuarial loss 0 0 0
Total net periodic cost $ 3 $ 3 $ 3