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Significant Events - Summary of Financial Impacts of Samarco Dam Failure (Parenthetical) (Detail) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Jun. 30, 2019
Samarco Germano Dam Decommissioning one [Member] |  |
Disclosure of exceptional items [line items] |  |
Change in estimate | $ (6) |
Exchange translation | 13 |
Samarco dam failure [member] |  |
Disclosure of exceptional items [line items] |  |
Change in estimate | (28) | $ (579)
Exchange translation | 84 |
Funding provided during the period | (27) |
Utilisation | (177) |
Samarco dam failure [member] | Continuation of reparatory and compensatory programs [member] |  |
Disclosure of exceptional items [line items] |  |
Utilisation | $ (3) |

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