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Employee benefits - Underfunded pension plans, Measurement of plan assets at fair value (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Return on plan assets $ (13)  
Underfunded Pension Plans [Member]    
IfrsStatementLineItems [Line Items]    
Assets as at beginning of the year 3,778  
Assets as at end of the year 339 $ 3,778
Underfunded Pension Plans [Member] | Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Assets as at beginning of the year   437
Return on plan assets (32) 11
Assets purchases 1 67
Assets sold during the year (3) (109)
Translation adjustment (20)  
Transfer between surplus and deficit plans (212)  
Assets as at end of the year 140  
Overfunded 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 34 11
Assets purchases 315 71
Assets sold during the year (350) (113)
Translation adjustment 26 (34)
Assets as at end of the year   406
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 181 250
Return on plan assets 1 11
Assets sold during the year (2) (108)
Translation adjustment (8)  
Transfer between surplus and deficit plans (164)  
Assets as at end of the year 8 181
Trading equity securities [member] | Overfunded Pension Plans [Member] | Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Return on plan assets (5) 10
Assets purchases 10 28
Assets sold during the year (36) (25)
Translation adjustment 4 (8)
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
Return on plan assets   14
Transfer between surplus and deficit plans (53)  
Assets as at end of the year 53
Equity investments [member] | Overfunded Pension Plans [Member] | Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Assets purchases   39
Ifrs Real Estate Funds [Member] | Underfunded Pension Plans [Member] | Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Assets as at beginning of the year 3 5
Return on plan assets  
Assets as at end of the year 6 3
Ifrs Real Estate Funds [Member] | Overfunded Pension Plans [Member] | Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Return on plan assets (2)  
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 2
Translation adjustment   (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 26 16
Assets purchases 280 67
Assets sold during the year (292) (74)
Translation adjustment 8 (8)
Others [Member] | Underfunded Pension Plans [Member] | Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Assets as at beginning of the year 168 180
Return on plan assets (33) (14)
Translation adjustment (10) 2
Assets as at end of the year 125 168
Investment property [member] | Underfunded Pension Plans [Member] | Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Assets purchases 1  
Assets sold during the year (1) (1)
Translation adjustment (2) (1)
Transfer between surplus and deficit plans 5  
Investment property [member] | Overfunded Pension Plans [Member] | Level 3 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Return on plan assets 15 (15)
Assets purchases 25 4
Assets sold during the year (22) (14)
Translation adjustment $ 14 $ (18)