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Significant Events - Summary of Provision for Samarco Dam Failure (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
Samarco dam failure [member]    
Disclosure of other provisions [line items]    
At the beginning of the financial year 2,051 1,914
Movement in provisions 741 137
Utilised (359) (369)
Change in estimate - Samarco dam failure provision 842 916
Change in estimate - Samarco Germano dam decommissioning (6) 37
Amortisation of discounting impacting net finance costs 85 93
Exchange translation 179 (540)
Current 1,206 896
Non-current 1,586 1,155
At the end of the financial year 2,792 2,051
Samarco dam failure provision 2,560 1,824
Samarco Germano dam decommissioning provision $ 232 $ 227