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Financial and capital risk management - Embedded derivatives in contracts (Details 7)
$ in Millions
 6 Months Ended
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Fixed Price Sales Protection Nickel Forwards Bought [Member]    
IfrsStatementLineItems [Line Items]    
Nominal amount of hedging instrument 2,580 766
Average strike per ton 20,842  
Fair value of liabilities   $ 7
Financial settlement inflows outflows $ 3  
Value at risk 3  
Hedge Program For Products Acquisition For Resale Nickel Forwards Sold [Member]    
IfrsStatementLineItems [Line Items]    
Nominal amount of hedging instrument   384
Fair value of liabilities   $ (1)
Financial settlement inflows outflows 2  
Nickel Forwards [Member]    
IfrsStatementLineItems [Line Items]    
Fair value of liabilities   $ 6
Financial settlement inflows outflows 5  
Value at risk $ 3  
Embedded Call Options Sold [Member]    
IfrsStatementLineItems [Line Items]    
Nominal amount of hedging instrument 746,667 746,667
Average strike per ton 233  
Fair value of liabilities $ (3) $ (5)
Value at risk 2  
Embedded Call Options Sold [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Value at risk (3)  
Call Options [Member]    
IfrsStatementLineItems [Line Items]    
Fair value of liabilities (3) $ (5)
Value at risk 2  
Call Options [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Value at risk $ (3)