v3.26.1
Pension and Other Postretirement Benefits - Schedule of Net Periodic Benefit Cost Components (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 4 $ 4 $ 7 $ 7
Interest cost 21 22 41 43
Expected return on plan assets (23) (23) (46) (45)
Amortization of prior service credit (1) (1) (1) (2)
Amortization of actuarial loss 4 6 8 11
Net periodic benefit cost (credit) 5 8 9 14
Other Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 3 3 6 6
Expected return on plan assets (3) (3) (6) (6)
Amortization of prior service credit (7) (8) (13) (16)
Net periodic benefit cost (credit) $ (7) $ (8) $ (13) $ (16)