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Employee benefits (Details 10) - Overfunded Pension Plans [Member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Transfer   $ (27)
Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Assets as at beginning of the year $ 656 664
Return on plan assets (77) 36
Assets purchases 65 230
Assets sold during the year (82) (235)
Translation adjustment (114) 37
Transfer between Overfunded pension and Underfunded pension plans 924 (76)
Assets as at end of the year 1,372 656
Trading equity securities [member] | Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Assets as at beginning of the year 200 240
Return on plan assets (12) 5
Assets purchases   11
Assets sold during the year (3) (6)
Translation adjustment (13) 8
Transfer between Overfunded pension and Underfunded pension plans   (58)
Transfer (129)  
Assets as at end of the year 43 200
International Investments [Member] | Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Assets as at beginning of the year
Return on plan assets (69)  
Translation adjustment (9)  
Transfer 129  
Assets as at end of the year 51
Ifrs Real Estate Funds [Member] | Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Assets as at beginning of the year   3
Assets sold during the year   (3)
Assets as at end of the year  
Investment property [member] | Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Assets as at beginning of the year 294 293
Return on plan assets (19) 9
Assets purchases 3 8
Assets sold during the year (12) (16)
Translation adjustment (54) 18
Transfer between Overfunded pension and Underfunded pension plans   (18)
Assets as at end of the year 212 294
Loan To Participants [Member] | Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Assets as at beginning of the year 162 128
Return on plan assets 23 22
Assets purchases 62 211
Assets sold during the year (67) (210)
Translation adjustment (38) 11
Assets as at end of the year 142 162
Other [Member] | Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Assets as at beginning of the year
Transfer between Overfunded pension and Underfunded pension plans 924  
Assets as at end of the year $ 924