v3.25.4
Employee Benefit Plans and Postretirement Benefits - Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Pension      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 8 $ 10 $ 9
Interest cost 54 52 54
Expected return on assets (49) (54) (45)
Amortization of:      
Prior service cost (credit) 1 0 0
Actuarial loss (gain) 20 22 18
Settlement loss and other 0 0 2
Net periodic benefit cost (income) 34 30 38
Healthcare      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 2 2 3
Interest cost 9 8 9
Expected return on assets (3) (3) (4)
Amortization of:      
Prior service cost (credit) (20) (24) (36)
Actuarial loss (gain) 1 0 0
Settlement loss and other 0 7 0
Net periodic benefit cost (income) (11) (10) (28)
Other      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 4 5 5
Interest cost 3 3 4
Expected return on assets 0 0 0
Amortization of:      
Prior service cost (credit) (8) 0 0
Actuarial loss (gain) (1) (3) 2
Settlement loss and other (6) 1 (1)
Net periodic benefit cost (income) $ (8) $ 6 $ 10