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Significant Events - Summary of Financial Impacts of Samarco Dam Failure (Parenthetical) (Detail) $ in Millions | 12 Months Ended
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Jun. 30, 2020 USD ($)
Disclosure of exceptional items [line items] |
Funding provided during the period | $ (242)
Samarco Germano Dam Decommissioning one [Member] |
Disclosure of exceptional items [line items] |
Change in estimate | 37
Exchange translation | (83)
Utilisation | (4)
Samarco dam failure one [Member] |
Disclosure of exceptional items [line items] |
Change in estimate | 916
Exchange translation | (457)
Funding provided during the period | (95)
Utilisation | $ (365)

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