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Closure and Rehabilitation Provisions - Summary of Closure and Rehabilitation Provisions (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Disclosure of other provisions [Line Items]      
Current $ 2,025 $ 1,959  
Non-current 8,223 8,445  
Closure and rehabilitation provisions [Member]      
Disclosure of other provisions [Line Items]      
At the beginning of the financial year 6,738 6,502  
Increases to existing and new provisions 132 127  
Exchange translation (11) 9  
Released during the year (165) (120)  
Amortisation of discounting impacting net finance costs 352 330  
Utilised (178) (132)  
Exchange variations impacting foreign currency translation reserve   (1)  
Divestment and demerger of subsidiaries and operations   (146)  
Transferred to liabilities held for sale (450)    
Other movements (1) (1)  
At the end of the financial year 6,330 6,738 $ 6,502
Current 274 255  
Non-current 6,056 6,483  
Closure and rehabilitation provisions [Member] | Operating sites [Member]      
Disclosure of other provisions [Line Items]      
At the beginning of the financial year 5,462    
Change in estimate 35 71  
Exchange translation (122) 99  
At the end of the financial year 5,120 5,462  
Closure and rehabilitation provisions [Member] | Closed sites [Member]      
Disclosure of other provisions [Line Items]      
At the beginning of the financial year 1,276    
Increases to existing and new provisions (21) 33 $ 18
At the end of the financial year $ 1,210 $ 1,276