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Post-employment benefits for associates - Reconciliation of net liability (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of net defined benefit liability (asset) [line items]      
Past service costs and settlements $ 0 $ (18) $ (154)
Pension plans      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability at beginning of period (270) (315)  
Current service cost (20) (24)  
Net interest expense (4) (3)  
Administrative expenses (2) (1)  
Past service costs and settlements 3 18  
Remeasurements 104 4  
Currency translation effects 4 17  
Employer contributions 19 23  
Change in limitation on recognition of fund surplus (1) (3)  
Net defined benefit liability at end of period (167) (270) (315)
Other post-employment benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability at beginning of period (300) (332)  
Current service cost (8) (10)  
Net interest expense (8) (7)  
Administrative expenses 0 0  
Past service costs and settlements 0 0  
Remeasurements 81 36  
Currency translation effects 0 0  
Employer contributions 14 13  
Change in limitation on recognition of fund surplus 0 0  
Net defined benefit liability at end of period (221) (300) $ (332)
Prepaid benefit cost | Pension plans      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability at beginning of period 25    
Net defined benefit liability at end of period 8 25  
Prepaid benefit cost | Other post-employment benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability at beginning of period 0    
Net defined benefit liability at end of period 0 0  
Accrued benefit liability | Pension plans      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability at beginning of period (295)    
Net defined benefit liability at end of period (175) (295)  
Accrued benefit liability | Other post-employment benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability at beginning of period (300)    
Net defined benefit liability at end of period $ (221) $ (300)