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Significant Events - Summary of Provision for Samarco Dam Failure (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
Samarco dam failure [member] |  |
Disclosure of other provisions [line items] |  |
At the beginning of the financial year | 1,914 | 1,285
Movement in provisions | 137 | 629
Utilised | (369) | (328)
Change in estimate - Samarco dam failure provision | 916 | 579
Change in estimate - Samarco Germano dam decommissioning | 37 | 263
Amortisation of discounting impacting net finance costs | 93 | 108
Exchange translation | (540) | 7
Current | 896 | 440
Non-current | 1,155 | 1,474
At the end of the financial year | $ 2,051 | $ 1,914

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