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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, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Disclosure of exceptional items [line items] |  |  |
Other income | $ 393 | $ 247 | $ 662
Expenses excluding net finance costs: |  |  |
Costs incurred directly by BHP Billiton Brasil and other BHP entities in relation to the Samarco dam failure | (28,022) | (27,527) | (24,120)
Loss from equity accounted investments, related impairments and expenses: |  |  |
Net finance costs | (1,064) | (1,245) | (1,417)
Loss before taxation | (1,060) | (650) | (763)
Samarco dam failure [member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Other income | 50 |  |
Expenses excluding net finance costs: |  |  |
Costs incurred directly by BHP Billiton Brasil and other BHP entities in relation to the Samarco dam failure | (57) | (57) | (82)
Loss from equity accounted investments, related impairments and expenses: |  |  |
Share of loss relating to the Samarco dam failure | (96) | (80) | (134)
Samarco Germano dam decommissioning | (263) |  |
Samarco dam failure provision | (586) | (429) | (38)
Net finance costs | (108) | (84) | (127)
Loss before taxation | $ (1,060) | $ (650) | $ (381)

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