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Exceptional Items - Summary of Exceptional Items Related to the Samarco Dam Failure (Detail) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2019
Disclosure of exceptional items [line items] |  |  |  |
Other income | $ 209 |  | $ 170 | $ 393
Expenses excluding net finance costs: |  |  |  |
Costs incurred directly by BHP Brasil and other BHP entities in relation to the Samarco dam failure | (14,315) |  | (13,695) | (28,022)
Loss from equity accounted investments, related impairments and expenses: |  |  |  |
Samarco impairment expense | (29) |  | (168) | (264)
Samarco dam failure provision | 56 |  | (70) | (586)
Net finance costs | (524) |  | (533) | (1,064)
Total | (784) |  | (210) | (1,060)
Samarco dam failure [member] |  |  |  |
Disclosure of exceptional items [line items] |  |  |  |
Other income | 40 |  |  | 50
Expenses excluding net finance costs: |  |  |  |
Costs incurred directly by BHP Brasil and other BHP entities in relation to the Samarco dam failure | (25) |  | (33) | (57)
Loss from equity accounted investments, related impairments and expenses: |  |  |  |
Samarco impairment expense | (27) |  | (47) | (96)
Samarco Germano dam decommissioning | 7 |  |  | (263)
Samarco dam failure provision | 56 |  | (70) | (586)
Net finance costs | (57) |  | (60) | (108)
Total | $ (6) | [1] | $ (210) | $ (1,060)
[1] | Refer to note 9 Significant events – Samarco dam failure for further information.

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