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Closure and Rehabilitation Provisions - Summary of Closure and Rehabilitation Provisions (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Disclosure of other provisions [line items]    
Current $ 3,696 $ 2,810
Non-current 13,799 11,185
Closure and rehabilitation provisions [member]    
Disclosure of other provisions [line items]    
At the beginning of the financial year 8,810 6,977
Increases to existing and new provisions 564 731
Exchange translation 76 (19)
Released during the year (157) (43)
Amortisation of discounting impacting net finance costs 380 356
Utilisation (321) (258)
Exchange variations impacting foreign currency translation reserve 3 (1)
Acquisition of subsidiaries and operations 179  
Divestment and demerger of subsidiaries and operations (81)  
At the end of the financial year 11,910 8,810
Current 591 373
Non-current 11,319 8,437
Closure and rehabilitation provisions [member] | Operating sites [member]    
Disclosure of other provisions [line items]    
At the beginning of the financial year 6,636  
Change in estimate 1,974 1,255
Exchange translation 483 (188)
At the end of the financial year 9,279 6,636
Closure and rehabilitation provisions [member] | Closed sites [member]    
Disclosure of other provisions [line items]    
At the beginning of the financial year 2,174  
At the end of the financial year $ 2,631 $ 2,174