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Employee benefits - Change in benefit obligation (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Overfunded Pension Plans [Member]    
IfrsStatementLineItems [Line Items]    
Benefit obligation (Plan assets) as at beginning of the year $ 919 [1] $ 864
Interest costs 84 [1] 58
Translation adjustment 46 [1] (63)
Benefit obligation (Plan assets) as at end of the year [1] 1,114 919
Overfunded Pension Plans [Member] | Country of domicile [member]    
IfrsStatementLineItems [Line Items]    
Benefit obligation (Plan assets) as at beginning of the year 876 864
Interest costs 83 58
Translation adjustment 54 (62)
Benefit obligation (Plan assets) as at end of the year 924 876
Overfunded Pension Plans [Member] | Present value of defined benefit obligation [member]    
IfrsStatementLineItems [Line Items]    
Benefit obligation (Plan assets) as at beginning of the year 2,833 3,105
Service costs 45  
Interest costs 325 196
Benefits paid (534) (235)
Effect of changes in the actuarial assumptions (784) (330)
Translation adjustment 5 (208)
Transfers 3,252 295
Benefit obligation (Plan assets) as at end of the year 5,142 2,833
Overfunded Pension Plans [Member] | Present value of defined benefit obligation [member] | Country of domicile [member]    
IfrsStatementLineItems [Line Items]    
Service costs   10
Underfunded Pension Plans [Member] | Present value of defined benefit obligation [member]    
IfrsStatementLineItems [Line Items]    
Benefit obligation (Plan assets) as at beginning of the year 3,983 4,632
Service costs 40 68
Interest costs 39 122
Benefits paid (58) (257)
Participant contributions (30) (31)
Effect of changes in the actuarial assumptions (109) (246)
Translation adjustment (5) (10)
Transfers (3,252) (295)
Benefit obligation (Plan assets) as at end of the year 608 3,983
Other Benefits [Member] | Present value of defined benefit obligation [member]    
IfrsStatementLineItems [Line Items]    
Benefit obligation (Plan assets) as at beginning of the year 1,427 1,733
Service costs 13 1
Interest costs 60 33
Benefits paid (57) (56)
Effect of changes in the actuarial assumptions (343) (261)
Translation adjustment (24) (23)
Other (19)  
Benefit obligation (Plan assets) as at end of the year $ 1,057 $ 1,427
[1] The pension plan asset is recorded as “Other non-current assets” in the balance sheet.