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Significant Events - Summary of Financial Impacts of Samarco Dam Failure (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Disclosure of exceptional items [line items] |  |  |
Funding provided during the period | $ (219) |  |
Samarco Germano Dam Decommissioning one [Member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Change in estimate | (6) | $ 37 | $ 263
Exchange translation | 21 | (83) | 0
Utilisation | (8) | (4) | 0
Samarco dam failure one [Member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Change in estimate | 842 | 916 | 579
Exchange translation | 158 | (457) | 7
Funding provided during the period | (111) | (95) | (96)
Utilisation | $ (351) | $ (365) | $ (328)

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