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Benefit Plans and Other Postretirement Benefits - Net Benefit Costs and Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pension Benefits      
Annual periodic pension cost      
Service cost benefits earned $ 3 $ 5 $ 7
Interest cost on benefit obligation 48 50 41
Expected return on plan assets (47) (39) (47)
Amortization of unrecognized net loss 2 6 3
Curtailment expense (6) (1) 14
Net periodic benefit cost 0 21 18
Pension and other post retirement benefit obligations      
Benefit obligation at January 1 1,023 1,036  
Service cost 3 5 7
Interest cost 48 50 41
Actuarial loss/(gain) (35) 22  
Employee and retiree contributions 0 0  
Annuity purchase settlement (50) 0  
Curtailment and special termination benefit loss 0 (2)  
Benefit payments (83) (89)  
Foreign exchange translation (5) 1  
Benefit obligation at December 31 901 1,023 1,036
Fair value of plan assets for pension and other post retirement benefit      
Fair value of plan assets at January 1 851 844  
Actual return on plan assets 16 93  
Employee and retiree contributions 0 0  
Employer contributions 38 2  
Defined Benefit Plan, Plan Assets, Payment for Settlement (50) 0  
Benefit payments (83) (89)  
Foreign exchange translation (5) 1  
Fair value of plan assets at December 31 767 851 844
Funded status at December 31 — excess of obligation over assets (134) (172)  
Other Postretirement Benefits Plan      
Annual periodic pension cost      
Service cost benefits earned 0 0  
Interest cost on benefit obligation 3 4 2
Amortization of unrecognized net loss (1) 1 2
Amortization of unrecognized prior service cost (3) (8) (8)
Net periodic benefit cost (1) (3) (4)
Pension and other post retirement benefit obligations      
Benefit obligation at January 1 75 84  
Service cost 0 0  
Interest cost 3 4 2
Actuarial loss/(gain) (1) (5)  
Employee and retiree contributions 3 4  
Annuity purchase settlement 0 0  
Curtailment and special termination benefit loss 0 (1)  
Benefit payments (10) (11)  
Foreign exchange translation 0 0  
Benefit obligation at December 31 70 75 84
Fair value of plan assets for pension and other post retirement benefit      
Fair value of plan assets at January 1 0 0  
Actual return on plan assets 0 0  
Employee and retiree contributions 3 4  
Employer contributions 7 7  
Defined Benefit Plan, Plan Assets, Payment for Settlement 0 0  
Benefit payments (10) (11)  
Foreign exchange translation 0 0  
Fair value of plan assets at December 31 0 0 $ 0
Funded status at December 31 — excess of obligation over assets $ (70) $ (75)