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Post-employment benefits for associates - Reconciliation of net liability (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Pension plans    
Reconciliation of Definted Benefit Liability [Roll Forward]    
Net defined benefit liability at beginning of period $ (215) $ (167)
Current service cost (16) (16)
Net interest expense (7) (6)
Administrative expenses (1) (2)
Remeasurements 22 (45)
Currency translation effects 10 (6)
Employer contributions 23 31
Change in limitation on recognition of fund surplus (8) (4)
Net defined benefit liability at end of period (192) (215)
Pension plans | Prepaid benefit cost    
Reconciliation of Definted Benefit Liability [Roll Forward]    
Net defined benefit liability at beginning of period 6  
Net defined benefit liability at end of period 6 6
Pension plans | Accrued benefit liability    
Reconciliation of Definted Benefit Liability [Roll Forward]    
Net defined benefit liability at beginning of period (221)  
Net defined benefit liability at end of period (198) (221)
Other post-employment benefit plans    
Reconciliation of Definted Benefit Liability [Roll Forward]    
Net defined benefit liability at beginning of period (213) (221)
Current service cost (5) (5)
Net interest expense (10) (11)
Administrative expenses 0 0
Remeasurements 5 10
Currency translation effects 0 0
Employer contributions 15 14
Change in limitation on recognition of fund surplus 0 0
Net defined benefit liability at end of period (208) (213)
Other post-employment benefit plans | Prepaid benefit cost    
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
Other post-employment benefit plans | Accrued benefit liability    
Reconciliation of Definted Benefit Liability [Roll Forward]    
Net defined benefit liability at beginning of period (213)  
Net defined benefit liability at end of period $ (208) $ (213)