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Employee benefits (Details 12) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Underfunded Pension Plans [Member]    
IfrsStatementLineItems [Line Items]    
Assets as at beginning of the year $ 339  
Assets as at end of the year 817 $ 339
Underfunded Pension Plans [Member] | Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Assets as at beginning of the year   406
Return on plan assets 7 (32)
Assets purchases 5 1
Assets sold during the year (19) (3)
Translation adjustment 5 (20)
Transfer between surplus and deficit plans 76 (212)
Assets as at end of the year 214  
Overfunded Pension Plans [Member] | Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Assets as at beginning of the year 140  
Return on plan assets 36 34
Assets purchases 230 315
Assets sold during the year (235) (350)
Translation adjustment 37 26
Assets as at end of the year   140
Trading equity securities [member] | Underfunded Pension Plans [Member] | Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Assets as at beginning of the year 8 181
Return on plan assets 4 1
Assets purchases 3  
Assets sold during the year (19) (2)
Translation adjustment 1 (8)
Transfer between surplus and deficit plans 58 (164)
Assets as at end of the year 55 8
Trading equity securities [member] | Overfunded Pension Plans [Member] | Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Return on plan assets 5 (5)
Assets purchases 11 10
Assets sold during the year (6) (36)
Translation adjustment 8 4
Equity investments [member] | Underfunded Pension Plans [Member] | Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Assets as at beginning of the year 53
Transfer between surplus and deficit plans   (53)
Assets as at end of the year
Investment property [member] | Underfunded Pension Plans [Member] | Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Assets as at beginning of the year 6 3
Assets purchases 2 1
Assets sold during the year   (1)
Translation adjustment 1 (2)
Transfer between surplus and deficit plans 18 5
Assets as at end of the year 27 6
Investment property [member] | Overfunded Pension Plans [Member] | Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Return on plan assets 9 15
Assets purchases 8 25
Assets sold during the year (16) (22)
Translation adjustment 18 14
Loan To Participants [Member] | Underfunded Pension Plans [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
Loan To Participants [Member] | Overfunded Pension Plans [Member] | Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Return on plan assets 22 26
Assets purchases 211 280
Assets sold during the year (210) (292)
Translation adjustment 11 8
Others [Member] | Underfunded Pension Plans [Member] | Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Assets as at beginning of the year 125 168
Return on plan assets 3 (33)
Translation adjustment 3 (10)
Assets as at end of the year $ 131 $ 125