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Significant Events - Summary of Financial Impacts of Samarco Dam Failure (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Disclosure of exceptional items [Line Items] |  |  |
Exceptional gain (loss), after tax | $ (2,970) | $ (1,006) | $ (2,767)
Costs incurred directly by BHP Billiton Brasil and other BHP entities in relation to the Samarco dam failure | (28,036) | (24,515) | (24,091)
Amortisation of discounting impacting net finance costs | (1,245) | (1,417) | (1,013)
Funding provided during the period | (142) |  |
Samarco dam failure [member] |  |  |
Disclosure of exceptional items [Line Items] |  |  |
Exceptional gain (loss), after tax | (650) | (381) | (2,197)
Share of loss | (80) | (134) | (655)
Costs incurred directly by BHP Billiton Brasil and other BHP entities in relation to the Samarco dam failure | (57) | (82) | (70)
Amortisation of discounting impacting net finance costs | (84) | (127) |
Change in estimate | 560 | 60 |
Exchange translation | (131) | (22) |
Impairment |  |  | (525)
Other movements | (429) | (38) | (1,200)
Additional share of loss from Samarco |  |  | (572)
Provision expense |  |  | $ (628)
Funding provided during the period | (80) |  |
Utilisation of the Samarco dam failure provision | (285) | $ (308) |
Continuation of reparatory and compensatory programs [member] | Samarco dam failure [member] |  |  |
Disclosure of exceptional items [Line Items] |  |  |
Utilisation of the Samarco dam failure provision | (281) |  |
Dam Stabilisation and Expert Costs [member] | Samarco dam failure [member] |  |  |
Disclosure of exceptional items [Line Items] |  |  |
Utilisation of the Samarco dam failure provision | $ (4) |  |

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