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Closure and Rehabilitation Provisions - Summary of Closure and Rehabilitation Provisions (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Disclosure of other provisions [line items]    
Current $ 2,810 $ 2,175
Non-current 11,185 8,928
Closure and rehabilitation provisions [member]    
Disclosure of other provisions [line items]    
At the beginning of the financial year 6,977 6,330
Increases to existing and new provisions 731 318
Exchange translation (19) (7)
Released during the year (43) (33)
Amortisation of discounting impacting net finance costs 356 353
Utilisation (258) (201)
Exchange variations impacting foreign currency translation reserve (1) (2)
Divestment and demerger of subsidiaries and operations   (80)
Other movements   (1)
At the end of the financial year 8,810 6,977
Current 373 361
Non-current 8,437 6,616
Closure and rehabilitation provisions [member] | Operating sites [member]    
Disclosure of other provisions [line items]    
At the beginning of the financial year 5,535  
Change in estimate 1,255 494
Exchange translation (188) (194)
At the end of the financial year 6,636 5,535
Closure and rehabilitation provisions [member] | Closed sites [member]    
Disclosure of other provisions [line items]    
At the beginning of the financial year 1,442  
At the end of the financial year $ 2,174 $ 1,442