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Contingent Liabilities and Assets (Tables)
12 Months Ended
Dec. 31, 2024
Disclosure of contingent liabilities [abstract]  
Summary of contingent liabilities
     
2024
US$m
    
2023
US$m
Contingent liabilities at reporting date
                 
Contingent liabilities
  
281
  
260
Guarantees
  
1
  
2
    
282
  
262