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Employee benefits (Details 3) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Overfunded Pension Plans [Member]    
IfrsStatementLineItems [Line Items]    
Interest costs $ 103 $ 84
Translation adjustment 73 46
Transfers (27)  
Overfunded Pension Plans [Member] | Present value of defined benefit obligation [member]    
IfrsStatementLineItems [Line Items]    
Benefit obligation (Plan assets) as at beginning of the year 5,142 2,833
Service costs 16 45
Interest costs 322 325
Benefits paid (479) (534)
Effect of changes in the actuarial assumptions 468 (784)
Translation adjustment 246 5
Other 3  
Transfers (1,201) 3,252
Benefit obligation (Plan assets) as at end of the year 4,517 5,142
Underfunded Pension Plans [Member]    
IfrsStatementLineItems [Line Items]    
Interest costs 1  
Transfers 27  
Underfunded Pension Plans [Member] | Present value of defined benefit obligation [member]    
IfrsStatementLineItems [Line Items]    
Benefit obligation (Plan assets) as at beginning of the year 608 3,983
Service costs 15 40
Interest costs 103 39
Benefits paid (126) (58)
Participant contributions   (30)
Effect of changes in the actuarial assumptions 130 (109)
Translation adjustment 41 (5)
Other 10  
Transfers 1,201 (3,252)
Effect of changes in the actuarial assumptions (836)  
Transfer to assets held for sale (28)  
Benefit obligation (Plan assets) as at end of the year 1,118 608
Other Benefits [Member] | Present value of defined benefit obligation [member]    
IfrsStatementLineItems [Line Items]    
Benefit obligation (Plan assets) as at beginning of the year 1,057 1,427
Service costs 8 13
Interest costs 68 60
Benefits paid (56) (57)
Effect of changes in the actuarial assumptions 44 (343)
Translation adjustment 43 (24)
Other (2) (19)
Transfer to assets held for sale (12)  
Benefit obligation (Plan assets) as at end of the year $ 1,150 $ 1,057