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Financial and capital risk management (Details 6) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Derivative financial liabilities $ 16 $ (24)
Derivatives settlement cash outflow (inflow) 4  
Value at Risk 5  
Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Derivative financial liabilities  
Later than one year [member]    
IfrsStatementLineItems [Line Items]    
Derivative financial liabilities 12  
Later than one year and not later than two years [member]    
IfrsStatementLineItems [Line Items]    
Derivative financial liabilities 4  
S O F R Versus U S Fixed Rate Swap [Member]    
IfrsStatementLineItems [Line Items]    
Derivative financial liabilities 16 (24)
Derivatives settlement cash outflow (inflow) 4  
Value at Risk 5  
Derivative assets, notional amount 2,150 2,300
Derivative liabilities, notional amount $ 2,150 $ 2,300
Derivative payable interest rate 3.77%  
S O F R Versus U S Fixed Rate Swap [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Derivative financial liabilities  
S O F R Versus U S Fixed Rate Swap [Member] | Later than one year [member]    
IfrsStatementLineItems [Line Items]    
Derivative financial liabilities 12  
S O F R Versus U S Fixed Rate Swap [Member] | Later than one year and not later than two years [member]    
IfrsStatementLineItems [Line Items]    
Derivative financial liabilities $ 4  
Euro Fixed Rate Versus U S Fixed Rate Swap [Member]    
IfrsStatementLineItems [Line Items]    
Derivative receivable interest rate 0.00%