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Significant Events - Summary of Provision for Samarco Dam Failure (Detail) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Jun. 30, 2019
Disclosure of other provisions [line items] |  |
Current | $ 2,106 | $ 2,175
Non-current | 9,459 | 8,928
Samarco dam failure [member] |  |
Disclosure of other provisions [line items] |  |
At the beginning of the reporting period | 1,914 | 1,285
Movement in provisions | (186) | 629
Utilised | (177) |
Change in estimate | 28 | 579
Amortisation of discounting impacting net finance costs | 57 | 108
Exchange translation | (84) |
Current | 500 | 440
Non-current | 1,228 | 1,474
At the end of the reporting period | 1,728 | 1,914
Samarco dam failure [member] | Samarco Total Provision [Member] |  |
Disclosure of other provisions [line items] |  |
Utilised | (180) | (328)
Exchange translation | (97) | 7
Samarco dam failure [member] | Samarco Germano Dam Decommissioning One [Member] |  |
Disclosure of other provisions [line items] |  |
Change in estimate | $ 6 | $ 263

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