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Employee benefits - Reconciliation of net liabilities recognized in the statement of financial position (Details) - Country of domicile [member] - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Mar. 31, 2023
Overfunded Pension Plans [Member]      
IfrsStatementLineItems [Line Items]      
Benefit obligation (Plan assets) as at beginning of the year $ 1,114 [1] $ 919  
Interest income 53 [1] 84  
Changes on asset ceiling 350 [1] 65  
Translation adjustment 85 [1] 46  
Benefit obligation (Plan assets) as at ending of the year [1] 1,602 1,114  
Benefit obligation (Plan assets) as at beginning of the year 95 [1] 84  
Non-current provisions for employee benefits   84 $ 95 [1]
Provisions for employee benefits 95 [1] 84  
Overfunded Pension Plans [Member] | Present value of defined benefit obligation [member]      
IfrsStatementLineItems [Line Items]      
Benefit obligation (Plan assets) as at beginning of the year (5,406) [1] (5,142)  
Overfunded Pension Plans [Member] | Plan assets [member]      
IfrsStatementLineItems [Line Items]      
Benefit obligation (Plan assets) as at beginning of the year 7,103 [1] 6,340  
Overfunded Pension Plans [Member] | Effect of asset ceiling [member]      
IfrsStatementLineItems [Line Items]      
Benefit obligation (Plan assets) as at beginning of the year (1,602) [1] (1,114)  
Underfunded Pension Plans [Member]      
IfrsStatementLineItems [Line Items]      
Benefit obligation (Plan assets) as at beginning of the year (289) (269)  
Current provisions for employee benefits (13) (10)  
Non-current provisions for employee benefits   (259) $ (276)
Provisions for employee benefits (289) (269)  
Underfunded Pension Plans [Member] | Present value of defined benefit obligation [member]      
IfrsStatementLineItems [Line Items]      
Benefit obligation (Plan assets) as at beginning of the year (643) (608)  
Underfunded Pension Plans [Member] | Plan assets [member]      
IfrsStatementLineItems [Line Items]      
Benefit obligation (Plan assets) as at beginning of the year 354 339  
Other Benefits [Member]      
IfrsStatementLineItems [Line Items]      
Benefit obligation (Plan assets) as at beginning of the year (1,132) (1,057)  
Current provisions for employee benefits (55) (56)  
Non-current provisions for employee benefits (1,077) (1,001)  
Provisions for employee benefits (1,132) (1,057)  
Other Benefits [Member] | Present value of defined benefit obligation [member]      
IfrsStatementLineItems [Line Items]      
Benefit obligation (Plan assets) as at beginning of the year $ (1,132) $ (1,057)  
[1] The pension plan asset is recorded as “Other non-current assets” in the statement of financial position.