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Post-employment benefits for associates - Reconciliation of net liability (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of Definted Benefit Liability [Roll Forward]      
Past service costs and settlements $ 0 $ 0 $ (18)
Pension plans      
Reconciliation of Definted Benefit Liability [Roll Forward]      
Net defined benefit liability at beginning of period (167) (270)  
Current service cost (16) (20)  
Net interest expense (6) (4)  
Administrative expenses (2) (2)  
Past service costs and settlements 0 3  
Remeasurements (45) 104  
Currency translation effects (6) 4  
Employer contributions 31 19  
Change in limitation on recognition of fund surplus (4) (1)  
Net defined benefit liability at end of period (215) (167) (270)
Other post-employment benefit plans      
Reconciliation of Definted Benefit Liability [Roll Forward]      
Net defined benefit liability at beginning of period (221) (300)  
Current service cost (5) (8)  
Net interest expense (11) (8)  
Administrative expenses 0 0  
Past service costs and settlements 0 0  
Remeasurements 10 81  
Currency translation effects 0 0  
Employer contributions 14 14  
Change in limitation on recognition of fund surplus 0 0  
Net defined benefit liability at end of period (213) (221) $ (300)
Prepaid benefit cost | Pension plans      
Reconciliation of Definted Benefit Liability [Roll Forward]      
Net defined benefit liability at beginning of period 8    
Net defined benefit liability at end of period 6 8  
Prepaid benefit cost | Other post-employment benefit plans      
Reconciliation of Definted Benefit Liability [Roll Forward]      
Net defined benefit liability at beginning of period 0    
Net defined benefit liability at end of period 0 0  
Accrued benefit liability | Pension plans      
Reconciliation of Definted Benefit Liability [Roll Forward]      
Net defined benefit liability at beginning of period (175)    
Net defined benefit liability at end of period (221) (175)  
Accrued benefit liability | Other post-employment benefit plans      
Reconciliation of Definted Benefit Liability [Roll Forward]      
Net defined benefit liability at beginning of period (221)    
Net defined benefit liability at end of period $ (213) $ (221)