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Post-employment benefits for associates - Reconciliation of net liability (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of net defined benefit liability (asset) [line items]      
Past service costs and settlements $ (154) $ 2 $ 1
Pension plans [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (278) (242)  
Current service cost (31) (22)  
Net interest expense (5) (5)  
Administrative expenses (1) (1)  
Past service costs and settlements (11) (2)  
Remeasurements 5 (36)  
Currency translation effects (20) 6  
Employer contributions 25 21  
Effect of acquisitions, divestments or transfers 12 5  
Change in limitation on recognition of fund surplus (11) (2)  
Net defined benefit liability (315) (278) (242)
Other post-employment benefit plans [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (423) (345)  
Current service cost (14) (8)  
Net interest expense (15) (14)  
Administrative expenses 0 0  
Past service costs and settlements 165 0  
Remeasurements (61) (28)  
Currency translation effects 0 0  
Employer contributions 16 (28)  
Effect of acquisitions, divestments or transfers 0 0  
Change in limitation on recognition of fund surplus 0 0  
Net defined benefit liability (332) (423) $ (345)
Prepaid benefit cost [member] | Pension plans [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability 13    
Net defined benefit liability 24 13  
Prepaid benefit cost [member] | Other post-employment benefit plans [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability 0    
Net defined benefit liability 0 0  
Accrued benefit liability [member] | Pension plans [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (291)    
Net defined benefit liability (339) (291)  
Accrued benefit liability [member] | Other post-employment benefit plans [member]      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (423)    
Net defined benefit liability $ (332) $ (423)