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Exceptional Items - Summary of Exceptional Items by Category (Detail) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2018
Disclosure of exceptional items [line items] |  |  |
Exceptional items gross | $ (210) | $ (210) | $ (650)
Exceptional items tax | 242 | (2,320) | (2,320)
Exceptional items net | 32 | (2,530) | (2,970)
Samarco dam failure [member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Exceptional items gross | (210) | (210) | (650)
Exceptional items tax |  |  |
Exceptional items net | (210) | (210) | (650)
US tax reform [member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Exceptional items tax |  | (2,320) | (2,320)
Exceptional items net |  | (2,320) | (2,320)
Non-controlling interests [member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Exceptional items gross |  |  |
Exceptional items tax |  |  |
Exceptional items net |  |  |
Attributable to BHP shareholders [member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Exceptional items gross | (210) | (210) | (650)
Exceptional items tax | 242 | (2,320) | (2,320)
Exceptional items net | 32 | $ (2,530) | $ (2,970)
Global taxation matters [Member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Exceptional items gross |  |  |
Exceptional items tax | 242 |  |
Exceptional items net | $ 242 |  |

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