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Financial and capital risk management - Sensitivity analysis of hedge accounting (Details 11) - Risk Nickel Price Increase [Member]
$ in Millions
Jun. 30, 2023
USD ($)
Nickel Revenue Hedge Program Options [Member]  
IfrsStatementLineItems [Line Items]  
Fair value of liabilities $ 45
Nickel Revenue Hedge Program Options [Member] | Sensitivity Scenario I [Member]  
IfrsStatementLineItems [Line Items]  
Fair value of liabilities 29
Nickel Revenue Hedge Program Options [Member] | Sensitivity Scenario Ii [Member]  
IfrsStatementLineItems [Line Items]  
Fair value of liabilities 13
Nickel Revenue Hedging Program Protected Item Part Of Nickel Revenues With Fixed Sales Prices [Member] | Sensitivity Scenario I [Member]  
IfrsStatementLineItems [Line Items]  
Fair value of liabilities (29)
Nickel Revenue Hedging Program Protected Item Part Of Nickel Revenues With Fixed Sales Prices [Member] | Sensitivity Scenario Ii [Member]  
IfrsStatementLineItems [Line Items]  
Fair value of liabilities $ (13)