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Employee benefits - Overfunded pension plans - Measurement of assets at fair value (Details) - Level 3 of fair value hierarchy [member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]    
Return on plan assets $ (13)  
Overfunded Pension Plans [Member]    
IfrsStatementLineItems [Line Items]    
Assets as at beginning of the year 426 $ 491
Return on plan assets 34 11
Assets purchases 315 71
Assets sold during the year (350) (113)
Translation adjustment 26 (34)
Transfer 213  
Assets as at end of the year 664 426
Trading equity securities [member] | Overfunded Pension Plans [Member]    
IfrsStatementLineItems [Line Items]    
Assets as at beginning of the year 103 126
Return on plan assets (5) 10
Assets purchases 10 28
Assets sold during the year (36) (25)
Translation adjustment 4 (8)
Transfer 164  
Assets as at end of the year 240 103
Ifrs Real Estate Funds [Member] | Overfunded Pension Plans [Member]    
IfrsStatementLineItems [Line Items]    
Assets as at beginning of the year 5 5
Return on plan assets (2)  
Assets as at end of the year 3 5
Investment property [member] | Overfunded Pension Plans [Member]    
IfrsStatementLineItems [Line Items]    
Assets as at beginning of the year 212 255
Return on plan assets 15 (15)
Assets purchases 25 4
Assets sold during the year (22) (14)
Translation adjustment 14 (18)
Transfer 49  
Assets as at end of the year 293 212
Loan To Participants [Member] | Overfunded Pension Plans [Member]    
IfrsStatementLineItems [Line Items]    
Assets as at beginning of the year 106 105
Return on plan assets 26 16
Assets purchases 280 67
Assets sold during the year (292) (74)
Translation adjustment 8 (8)
Assets as at end of the year $ 128 $ 106