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Financial and capital risk management (Details 11)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
IfrsStatementLineItems [Line Items]      
Derivatives settlement cash outflow $ 567 $ (83) $ (197)
Fixed Price Sales Protection Nickel Forwards Bought [Member]      
IfrsStatementLineItems [Line Items]      
Nominal amount of hedging instrument 3,322 766  
Average strike per ton 19,207    
Fair value of liabilities $ (8) $ 7  
Derivatives settlement cash outflow (3)    
Value at risk 3    
Fixed Price Sales Protection Nickel Forwards Bought [Member] | Not later than one year [member]      
IfrsStatementLineItems [Line Items]      
Value at risk (8)    
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)  
Derivatives settlement cash outflow 2    
Nickel Forwards [Member]      
IfrsStatementLineItems [Line Items]      
Fair value of liabilities (8) $ 6  
Derivatives settlement cash outflow (1)    
Value at risk 3    
Nickel Forwards [Member] | Not later than one year [member]      
IfrsStatementLineItems [Line Items]      
Value at risk $ (8)    
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 $ (2) $ (5)  
Value at risk 2    
Embedded Call Options Sold [Member] | Not later than one year [member]      
IfrsStatementLineItems [Line Items]      
Value at risk (2)    
Call Options [Member]      
IfrsStatementLineItems [Line Items]      
Fair value of liabilities (2) $ (5)  
Value at risk 2    
Call Options [Member] | Not later than one year [member]      
IfrsStatementLineItems [Line Items]      
Value at risk $ (2)