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Significant Events - Summary of Financial Impacts of Samarco Dam Failure (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018
Disclosure of exceptional items [line items] |  |
Funding provided during the period | $ (303) |
Samarco dam failure [member] |  |
Disclosure of exceptional items [line items] |  |
Change in estimate | (579) | $ (560)
Exchange translation | (7) | 131
Funding provided during the period | (96) |
Utilisation | (328) | $ (285)
Continuation of reparatory and compensatory programs [member] | Samarco dam failure [member] |  |
Disclosure of exceptional items [line items] |  |
Utilisation | (313) |
Dam stabilisation and expert costs [member] | Samarco dam failure [member] |  |
Disclosure of exceptional items [line items] |  |
Utilisation | $ (15) |

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