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Employee benefits (Details 12) - Underfunded Pension Plans [Member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Assets as at beginning of the year $ 817  
Assets as at end of the year 743 $ 817
Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Assets as at beginning of the year 214 140
Return on plan assets 33 7
Assets purchases   5
Assets sold during the year (2) (19)
Translation adjustment (19) 5
Transfer between surplus and deficit plans   76
Assets as at end of the year 226 214
Trading equity securities [member] | Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Assets as at beginning of the year 55 8
Return on plan assets   4
Assets purchases   3
Assets sold during the year (1) (19)
Translation adjustment   1
Transfer between surplus and deficit plans   58
Transfer (54)  
Assets as at end of the year 55
International Investments [Member] | Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Assets as at beginning of the year
Return on plan assets 17  
Translation adjustment (5)  
Transfer 54  
Assets as at end of the year 66
Investment property [member] | Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Assets as at beginning of the year 27 6
Return on plan assets 20  
Assets purchases   2
Assets sold during the year (1)  
Translation adjustment (3) 1
Transfer between surplus and deficit plans   18
Assets as at end of the year 43 27
Loan To Participants [Member] | Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Assets as at beginning of the year 1 1
Assets as at end of the year 1 1
Others [Member] | Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Assets as at beginning of the year 131 125
Return on plan assets (4) 3
Translation adjustment (11) 3
Assets as at end of the year $ 116 $ 131