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Contingent liabilities (Tables)
 12 Months Ended
Jun. 30, 2021
Text block [abstract]  
Summary of Contingent Liabilities
 
    
2021
      2020  
    
US$M
      US$M  
Associates and joint ventures
(1)
   
 
1,532
 
      1,314  
Subsidiaries and joint operations
(1)
   
 
1,615
 
      1,534  
    
 
 
     
 
 
  
Total
   
 
3,147
 
      2,848  
    
 
 
     
 
 
  
 
(1)
 
There are a number of matters, for which it is not possible at this time to provide a range of possible outcomes or a reliable estimate of potential future exposures, and for which no amounts have been included in the table above.