Closure and rehabilitation provisions (Tables)
 12 Months Ended
Jun. 30, 2021
Text block [abstract]  
Summary of Closure and Rehabilitation Provisions
 
    
2021
     2020  
    
US$M
     US$M  
At the beginning of the financial year
   
 
8,810
 
     6,977  
Capitalised amounts for operating sites:
                 
Change in estimate
   
 
1,974
 
     1,255  
Exchange translation
   
 
483
 
     (188 ) 
Adjustments charged/(credited) to the income statement:
                 
Increases to existing and new provisions
   
 
564
 
     731  
Exchange translation
   
 
76
 
     (19 ) 
Released during the year
   
 
(157
) 
     (43 ) 
Other adjustments to the provision:
                 
Amortisation of discounting impacting net finance costs
   
 
380
 
     356  
Acquisition of subsidiaries and operations
   
 
179
 
     –  
Divestment and demerger of subsidiaries and operations
   
 
(81
) 
     –  
Expenditure on closure and rehabilitation activities
   
 
(321
) 
     (258 ) 
Exchange variations impacting foreign currency translation reserve
   
 
3
 
     (1 ) 
    
 
 
    
 
 
  
At the end of the financial year
   
 
11,910
 
     8,810  
    
 
 
    
 
 
  
Comprising:
                 
Current
   
 
591
 
     373  
Non-current
   
 
11,319
 
     8,437  
    
 
 
    
 
 
  
Operating sites
   
 
9,279
 
     6,636  
Closed sites
   
 
2,631
 
     2,174