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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, 2024 | Jun. 30, 2023 | Jun. 30, 2022
Disclosure of exceptional items [line items] |  |  |
Funding provided during the period | $ (63) |  |
Samarco dam failure one [Member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Change in estimate | 3,700 | $ (33) | $ 691
Exchange translation | (867) | 289 | (96)
Funding provided during the period | (125) |  |
Utilisation | $ (515) | $ (448) | $ (256)

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