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Significant Events - Summary of Provision for Samarco Dam Failure (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Disclosure of other provisions [line items]    
Current $ 3,965 $ 3,696
Non-current 10,478 13,799
Samarco dam failure [member]    
Disclosure of other provisions [line items]    
At the beginning of the financial year 2,792 2,051
Movement in provisions 629 741
Utilised (256) (359)
Change in estimate - Samarco dam failure provision 747 842
Change in estimate - Samarco Germano dam decommissioning (56) (6)
Amortisation of discounting impacting net finance costs 290 85
Exchange translation (96) 179
Current 1,815 1,206
Non-current 1,606 1,586
At the end of the financial year 3,421 2,792
Samarco dam failure provision 3,237 2,560
Samarco Germano dam decommissioning provision $ 184 $ 232