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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, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Disclosure of exceptional items [line items] |  |  |
Other income | $ 510 | $ 777 | $ 393
Expenses excluding net finance costs: |  |  |
Costs incurred directly by BHP Brasil and other BHP entities in relation to the Samarco dam failure | (34,500) | (28,775) | (28,022)
Loss from equity accounted investments, related impairments and expenses: |  |  |
Samarco impairment expense | (2,635) | (494) | (264)
Fair value change on forward exchange derivatives | (145) | (422) | (8)
Net finance costs | (1,305) | (911) | (1,064)
Income tax expense | (11,150) | (4,774) | (5,529)
Total | (5,797) | (1,305) | (818)
Samarco dam failure [member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Other income | 34 | 489 | 50
Expenses excluding net finance costs: |  |  |
Costs incurred directly by BHP Brasil and other BHP entities in relation to the Samarco dam failure | (46) | (64) | (57)
Loss from equity accounted investments, related impairments and expenses: |  |  |
Samarco impairment expense | (111) | (95) | (96)
Samarco Germano dam decommissioning | (15) | 46 | (263)
Samarco dam failure provision | (1,000) | (459) | (586)
Fair value change on forward exchange derivatives | 136 |  |
Net finance costs | (85) | (93) | (108)
Income tax expense | (71) |  |
Total | $ (1,158) | $ (176) | $ (1,060)

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