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Financial and capital risk management (Details 12)
$ in Millions
Dec. 31, 2023
USD ($)
Fixed Price Sales Protection Forwards [Member] | Risk Nickel Price Increase [Member]  
IfrsStatementLineItems [Line Items]  
Fair value of liabilities $ (8)
Fixed Price Sales Protection Forwards [Member] | Risk Nickel Price Increase [Member] | Sensitivity Scenario I [Member]  
IfrsStatementLineItems [Line Items]  
Fair value of liabilities (21)
Fixed Price Sales Protection Forwards [Member] | Risk Nickel Price Increase [Member] | Sensitivity Scenario Ii [Member]  
IfrsStatementLineItems [Line Items]  
Fair value of liabilities (35)
Protected Item Part Of Nickel Revenues With Fixed Prices [Member] | Risk Nickel Price Increase [Member] | Sensitivity Scenario I [Member]  
IfrsStatementLineItems [Line Items]  
Fair value of liabilities 21
Protected Item Part Of Nickel Revenues With Fixed Prices [Member] | Risk Nickel Price Increase [Member] | Sensitivity Scenario Ii [Member]  
IfrsStatementLineItems [Line Items]  
Fair value of liabilities 35
Embedded Derivatives Gas Purchase [Member] | Risk Pellet Price Increase [Member]  
IfrsStatementLineItems [Line Items]  
Fair value of liabilities (2)
Embedded Derivatives Gas Purchase [Member] | Risk Pellet Price Increase [Member] | Sensitivity Scenario I [Member]  
IfrsStatementLineItems [Line Items]  
Fair value of liabilities (6)
Embedded Derivatives Gas Purchase [Member] | Risk Pellet Price Increase [Member] | Sensitivity Scenario Ii [Member]  
IfrsStatementLineItems [Line Items]  
Fair value of liabilities $ (13)