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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, 2020 | Jun. 30, 2019 | Jun. 30, 2018
Disclosure of exceptional items [line items] |  |  |
Other income | $ 777 | $ 393 | $ 247
Expenses excluding net finance costs: |  |  |
Costs incurred directly by BHP Brasil and other BHP entities in relation to the Samarco dam failure | (28,775) | (28,022) | (27,527)
Loss from equity accounted investments, related impairments and expenses: |  |  |
Samarco impairment expense | (494) | (264) | (333)
Net finance costs | (911) | (1,064) | (1,245)
Total | (1,546) | (1,060) | (650)
Samarco dam failure [member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Other income | 489 | 50 |
Expenses excluding net finance costs: |  |  |
Costs incurred directly by BHP Brasil and other BHP entities in relation to the Samarco dam failure | (64) | (57) | (57)
Loss from equity accounted investments, related impairments and expenses: |  |  |
Samarco impairment expense | (95) | (96) | (80)
Samarco Germano dam decommissioning | 46 | (263) |
Samarco dam failure provision | (459) | (586) | (429)
Net finance costs | (93) | (108) | (84)
Total | $ (176) | $ (1,060) | $ (650)

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