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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

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