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Post-employment benefits for associates - Reconciliation of net liability (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Pension plans [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit liability $ (242) $ (232)
Current service cost (22) (28)
Net interest expense (5) (6)
Administrative expenses (1) (1)
Past service costs and settlements (2) (1)
Remeasurements (36) 1
Currency translation effects 6 6
Employer contributions 21 19
Effect of acquisitions, divestments or transfers 5 (2)
Change in limitation on recognition of fund surplus (2) 2
Net defined benefit liability (278) (242)
Other post-employment benefit plans [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit liability (345) (317)
Current service cost (8) (11)
Net interest expense (14) (11)
Administrative expenses 0 0
Past service costs and settlements 0 0
Remeasurements (28) 5
Currency translation effects 0 0
Employer contributions (28) (11)
Effect of acquisitions, divestments or transfers 0 0
Change in limitation on recognition of fund surplus 0 0
Net defined benefit liability (423) (345)
Prepaid benefit cost [member] | Pension plans [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit liability 12  
Net defined benefit liability 13 12
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 (254)  
Net defined benefit liability (291) (254)
Accrued benefit liability [member] | Other post-employment benefit plans [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit liability (345)  
Net defined benefit liability $ (423) $ (345)