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Exceptional Items - Summary of Exceptional Items Related to the Samarco Dam Failure (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Expenses excluding net finance costs: |  |  |
Costs incurred directly by BHP Billiton Brasil and other BHP entities in relation to the Samarco dam failure | $ (28,036) | $ (24,515) | $ (24,091)
Loss from equity accounted investments, related impairments and expenses: |  |  |
Net finance costs | (1,245) | (1,417) | (1,013)
Loss before taxation | (650) | (763) | (2,520)
Costs incurred directly by BHP Billiton Brasil and other BHP entities in relation to the Samarco dam failure | (28,036) | (24,515) | (24,091)
Samarco dam failure [member] |  |  |
Expenses excluding net finance costs: |  |  |
Costs incurred directly by BHP Billiton Brasil and other BHP entities in relation to the Samarco dam failure | (57) | (82) | (70)
Loss from equity accounted investments, related impairments and expenses: |  |  |
Share of loss relating to the Samarco dam failure | (80) | (134) | (655)
Samarco dam failure provision | (429) | (38) | (1,200)
Impairment of the carrying value of the investment in Samarco |  |  | (525)
Net finance costs | (84) | (127) |
Loss before taxation | (650) | (381) | (2,450)
Share of loss from Samarco | (80) | (134) | (655)
Impairment |  |  | (525)
Other movements | (429) | (38) | (1,200)
Costs incurred directly by BHP Billiton Brasil and other BHP entities in relation to the Samarco dam failure | $ (57) | $ (82) | (70)
Additional share of loss from Samarco |  |  | (572)
Provision expense |  |  | $ (628)

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