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Risk management (Details)
Number in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Number
IfrsStatementLineItems [Line Items]    
Fair Value Of Derivative Financial Assets (Liability) $ (120) $ (250)
Derivatives Not Designated For Hedge Accounting [member] | Long Position Or Foreign Currency One [Member]    
IfrsStatementLineItems [Line Items]    
Notional value $ 9,058 (2,688)
Description of derivative maturity period 2023  
Derivatives Not Designated For Hedge Accounting [member] | Board members [member]    
IfrsStatementLineItems [Line Items]    
Notional value $ (8,375) 1,380
Description of derivative maturity period 2023  
Futures contract [member] | Derivatives Not Designated For Hedge Accounting [member]    
IfrsStatementLineItems [Line Items]    
Notional value $ 683 (1,308)
Fair Value Of Derivative Financial Assets (Liability) (40) $ (1)
Forward contract [member] | Derivatives Not Designated For Hedge Accounting [member] | Long Position Or Foreign Currency Forwards Gbp Usd [Member]    
IfrsStatementLineItems [Line Items]    
Notional value-Short position | Number   15
Swap contract [member] | Derivatives Not Designated For Hedge Accounting [member] | Foreign Currency Or Cross Currency Swap Matured In Two Thousand Twenty Nine And Two Thousand Thirty Four [Member]    
IfrsStatementLineItems [Line Items]    
Fair Value Of Derivative Financial Assets (Liability)   $ 23
Notional value-Short position | Number   442
Notional value-Long position | Number   583
Swap contract [member] | Derivatives Not Designated For Hedge Accounting [member] | Not Later Than Five Year [member]    
IfrsStatementLineItems [Line Items]    
Fair Value Of Derivative Financial Assets (Liability)   $ (50)
Swap contract [member] | Derivatives Not Designated For Hedge Accounting [member] | Ibiritermo S.A. [member]    
IfrsStatementLineItems [Line Items]    
Fair Value Of Derivative Financial Assets (Liability) $ (16) (1)
Description of derivative maturity period 2029/2034  
Swap contract [member] | Derivatives Not Designated For Hedge Accounting [member] | Later Than Five Year And Not Later Than Ten Years [member] [Default Label]    
IfrsStatementLineItems [Line Items]    
Fair Value Of Derivative Financial Assets (Liability) $ (64) $ (221)
Description of derivative maturity period 2024/2029