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Contingent Liabilities and Assets (Tables)
12 Months Ended
Dec. 31, 2023
Disclosure of contingent liabilities [abstract]  
Summary of contingent liabilities
 
 
 
 
 
 
 
 
 
     
2023
US$m
    
2022
US$m
Contingent liabilities at reporting date
                 
Contingent liabilities
  
 
260
 
  
 
161
 
Guarantees
  
 
2
 
  
 
2
 
    
 
262
 
  
 
163