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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, 2018 | Dec. 31, 2017 | Jun. 30, 2018
Expenses excluding net finance costs: |  |  |
Costs incurred directly by BHP Billiton Brasil and other BHP entities in relation to the Samarco dam failure | $ (13,695) | $ (13,697) | $ (27,527)
Loss from equity accounted investments, related impairments and expenses: |  |  |
Samarco dam failure provision | (70) | (87) | (429)
Net finance costs | (533) | (658) | (1,245)
Loss before taxation | (210) | (210) | (650)
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 | (33) | (29) | (57)
Loss from equity accounted investments, related impairments and expenses: |  |  |
Share of loss relating to the Samarco dam failure | (47) | (50) | (80)
Samarco dam failure provision | (70) | (87) | (429)
Net finance costs | (60) | (44) | (84)
Loss before taxation | $ (210) | $ (210) | $ (650)

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