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Financial and capital risk management (Details 8) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Treasury Forward [Member]      
IfrsStatementLineItems [Line Items]      
Protection notional amount $ 1,130    
Protection average rate 4.44%    
Protection fair value $ (6)  
Protection financial settlement inflows    
Protection value at risk 3    
Treasury Forward [Member] | Not later than one year [member]      
IfrsStatementLineItems [Line Items]      
Protection fair value (6)    
Treasury Forward One [Member]      
IfrsStatementLineItems [Line Items]      
Protection fair value  
Protection financial settlement inflows (3)    
Protection value at risk    
Treasury Forward One [Member] | Not later than one year [member]      
IfrsStatementLineItems [Line Items]      
Protection fair value