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Financial and capital risk management - Embedded derivatives in contracts (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
IfrsStatementLineItems [Line Items]      
Financial settlement inflows outflows $ (83) $ (197) $ (34)
Fixed Price Sales Protection Nickel Forwards Bought [Member]      
IfrsStatementLineItems [Line Items]      
Nominal amount of hedging instrument 766 342  
Average strike per ton 21,214    
Fair value of liabilities $ 7 $ 1  
Financial settlement inflows outflows 3    
Value at risk 1    
Fixed Price Sales Protection Nickel Forwards Bought [Member] | Not later than one year [member]      
IfrsStatementLineItems [Line Items]      
Value at risk $ 7    
Hedge Program For Products Acquisition For Resale Nickel Forwards Sold [Member]      
IfrsStatementLineItems [Line Items]      
Nominal amount of hedging instrument 384 1,206  
Average strike per ton 28,657    
Fair value of liabilities $ (1) $ (1)  
Financial settlement inflows outflows 7    
Value at risk 1    
Hedge Program For Products Acquisition For Resale Nickel Forwards Sold [Member] | Not later than one year [member]      
IfrsStatementLineItems [Line Items]      
Value at risk (1)    
Nickel Forwards [Member]      
IfrsStatementLineItems [Line Items]      
Fair value of liabilities 6    
Financial settlement inflows outflows 10    
Value at risk 2    
Nickel Forwards [Member] | Not later than one year [member]      
IfrsStatementLineItems [Line Items]      
Value at risk $ 6    
Call Option Spc Brought [Member]      
IfrsStatementLineItems [Line Items]      
Nominal amount of hedging instrument   137,751,623  
Fair value of liabilities   $ 13  
Embedded Call Options Sold [Member]      
IfrsStatementLineItems [Line Items]      
Nominal amount of hedging instrument 746,667 729,571  
Average strike per ton 233    
Fair value of liabilities $ (5) $ (1)  
Value at risk 3    
Embedded Call Options Sold [Member] | Not later than one year [member]      
IfrsStatementLineItems [Line Items]      
Value at risk (5)    
Call Options [Member]      
IfrsStatementLineItems [Line Items]      
Fair value of liabilities (5) $ 12  
Value at risk 3    
Call Options [Member] | Not later than one year [member]      
IfrsStatementLineItems [Line Items]      
Value at risk $ (5)