v3.26.1
Pensions and Other Postretirement Benefits - Schedule of Pension and Other Postretirement Expenses (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Pension Benefits        
Components of Net Periodic Cost:        
Service Cost $ 1 $ 2 $ 2 $ 3
Interest Cost 6 5 11 11
Expected Return on Plan Assets (6) (6) (12) (12)
Amortization:        
Actuarial Loss (Gain) 1 1 2 2
Net Periodic Cost 2 2 3 4
Postretirement Benefits        
Components of Net Periodic Cost:        
Service Cost 0 0 0 0
Interest Cost 1 0 1 0
Expected Return on Plan Assets 0 0 0 0
Amortization:        
Actuarial Loss (Gain) (1) 0 (1) 0
Net Periodic Cost $ 0 $ 0 $ 0 $ 0