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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Pension Benefits      
Annual periodic pension cost      
Service cost benefits earned $ 5 $ 7 $ 9
Interest cost on benefit obligation 50 41 27
Expected return on plan assets (39) (47) (66)
Amortization of unrecognized net loss 6 3 1
Curtailment expense (1) 14 2
Net periodic benefit cost/(credit) 21 18 (27)
Pension and other post retirement benefit obligations      
Benefit obligation at January 1 1,036 1,452  
Service cost 5 7 9
Interest cost 50 41 27
Actuarial loss/(gain) 22 (289)  
Employee and retiree contributions 0 0  
Curtailment and special termination benefit loss (2) 0  
Benefit payments (89) (171)  
Foreign exchange translation 1 (4)  
Benefit obligation at December 31 1,023 1,036 1,452
Fair value of plan assets for pension and other post retirement benefit      
Fair value of plan assets at January 1 844 1,336  
Actual return on plan assets 93 (317)  
Employee and retiree contributions 0 0  
Employer contributions 2 0  
Benefit payments (89) (171)  
Foreign exchange translation 1 (4)  
Fair value of plan assets at December 31 851 844 1,336
Funded status at December 31 — excess of obligation over assets (172) (192)  
Other Postretirement Benefits Plan      
Annual periodic pension cost      
Service cost benefits earned 0 0  
Interest cost on benefit obligation 4 2 2
Amortization of unrecognized prior service cost (8) (8) (10)
Amortization of unrecognized net loss 1 2 1
Curtailment expense 0 0 1
Net periodic benefit cost/(credit) (3) (4) (6)
Pension and other post retirement benefit obligations      
Benefit obligation at January 1 84 105  
Service cost 0 0  
Interest cost 4 2 2
Actuarial loss/(gain) (5) (11)  
Employee and retiree contributions 4 3  
Curtailment and special termination benefit loss (1) 0  
Benefit payments (11) (15)  
Foreign exchange translation 0 0  
Benefit obligation at December 31 75 84 105
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 4 3  
Employer contributions 7 12  
Benefit payments (11) (15)  
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 $ (75) $ (84)