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Contingent Liabilities and Assets (Tables)
12 Months Ended
Dec. 31, 2022
Text Block [abstract]  
Summary of contingent liabilities
  
  
2022
US$m
 
  
2021
US$m
Contingent
liabilities
at
reporting
date
  
 
 
 
  
 
 
 
Contingent liabilities

  
 
161
 
  
 
195
 
Guarantees

  
 
2
 
  
 
7
 
    
 
163
 
  
 
202