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Closure and Rehabilitation Provisions - Summary of Closure and Rehabilitation Provisions (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Disclosure of other provisions [line items]      
Current $ 2,175 $ 2,025  
Non-current 8,928 8,223  
Closure and rehabilitation provisions [member]      
Disclosure of other provisions [line items]      
At the beginning of the financial year 6,330 6,738  
Increases to existing and new provisions 318 132  
Exchange translation (7) (11)  
Released during the year (33) (165)  
Amortisation of discounting impacting net finance costs 353 352  
Utilisation (201) (178)  
Exchange variations impacting foreign currency translation reserve (2)    
Divestment and demerger of subsidiaries and operations (80)    
Transferred to liabilities held for sale   (450)  
Other movements (1) (1)  
At the end of the financial year 6,977 6,330 $ 6,738
Current 361 274  
Non-current 6,616 6,056  
Closure and rehabilitation provisions [member] | Operating sites [member]      
Disclosure of other provisions [line items]      
At the beginning of the financial year 5,120    
Change in estimate 494 35  
Exchange translation (194) (122)  
At the end of the financial year 5,535 5,120  
Closure and rehabilitation provisions [member] | Closed sites [member]      
Disclosure of other provisions [line items]      
At the beginning of the financial year 1,210    
Increases to existing and new provisions 251 (21) $ 33
At the end of the financial year $ 1,442 $ 1,210