v3.26.1
Pensions and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 7 $ 6
Interest cost 25 26
Expected return on plan assets (52) (49)
Amortization of net losses 4 6
Amortization of prior service benefit 0 0
Net benefit (16) (11)
Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 1 1
Interest cost 3 3
Expected return on plan assets (2) (2)
Amortization of net losses 0 0
Amortization of prior service benefit (6) (6)
Net benefit $ (4) $ (4)