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Significant Events - Summary of Provision for Samarco Dam Failure (Detail) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Disclosure of other provisions [Line Items] |  |
Current | $ 2,025 | $ 1,959
Non-current | 8,223 | 8,445
Samarco dam failure [member] |  |
Disclosure of other provisions [Line Items] |  |
At the beginning of the financial year | 1,057 | 1,200
Movement in provision | 228 | (143)
Utilised | (285) | (308)
Change in estimate | 560 | 60
Amortisation of discounting impacting net finance costs | 84 | 127
Exchange translation | (131) | (22)
At the end of the financial year | 1,285 | 1,057
Current | 313 | 310
Non-current | $ 972 | $ 747

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- Details
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