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Financial and capital risk management - Protection program for Libor floating interest rate US denominated debt (Details 2) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Euro Fixed Rate Versus U S Fixed Rate Swap [Member]    
IfrsStatementLineItems [Line Items]    
Derivative financial liabilities $ 8 $ 7
Financial settlement inflows outflows 4  
Derivative assets, notional amount $ 150 150
Derivative receivable interest rate 0.85%  
Derivative liabilities, notional amount $ 150 150
Derivative payable interest rate 0.85%  
Euro Fixed Rate Versus U S Fixed Rate Swap [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Derivative financial liabilities $ 4  
L I B O R [Member]    
IfrsStatementLineItems [Line Items]    
Derivative financial liabilities 8 $ 7
Financial settlement inflows outflows 4  
L I B O R [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Derivative financial liabilities $ 4