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Financial and capital risk management - Cash flow hedge (Details 10)
$ in Millions
 6 Months Ended
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Nickel Revenue Hedging Programs Forward Options Sold [Member]    
IfrsStatementLineItems [Line Items]    
Nominal amount of hedging instrument (3,150) 6,300
Average strike per ton 34,929  
Fair value of liabilities $ 45 $ 28
Financial settlement inflows outflows 34  
Value at risk 4  
Nickel Revenue Hedging Programs Forward Options Sold [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Value at risk 45  
Nickel Revenue Hedge Program [Member]    
IfrsStatementLineItems [Line Items]    
Fair value of liabilities 45 $ 28
Financial settlement inflows outflows 34  
Value at risk 4  
Nickel Revenue Hedge Program [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Value at risk $ 45