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Discontinued Operations - Summary of Exceptional Items - Discontinued Operations (Detail) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2018
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |
Exceptional items gross | $ (210) | $ (210) | $ (650)
Exceptional items tax | 242 | (2,320) | (2,320)
Exceptional items net | 32 | (2,530) | (2,970)
US tax reform [member] |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |
Exceptional items tax |  | (2,320) | (2,320)
Exceptional items net |  | (2,320) | (2,320)
Non-controlling interests [member] |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |
Exceptional items gross |  |  |
Exceptional items tax |  |  |
Exceptional items net |  |  |
Attributable to BHP shareholders [member] |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |
Exceptional items gross | (210) | (210) | (650)
Exceptional items tax | 242 | (2,320) | (2,320)
Exceptional items net | 32 | (2,530) | (2,970)
Discontinued operations [member] |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |
Exceptional items gross |  |  | (2,859)
Exceptional items tax |  | 492 | 601
Exceptional items net | $ 0 | 492 | (2,258)
Discontinued operations [member] | US tax reform [member] |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |
Exceptional items gross |  |  |
Exceptional items tax |  | 492 | 492
Exceptional items net |  | 492 | 492
Discontinued operations [member] | Impairment of Onshore US assets [member] |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |
Exceptional items gross |  |  | (2,859)
Exceptional items tax |  |  | 109
Exceptional items net |  |  | (2,750)
Discontinued operations [member] | Non-controlling interests [member] |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |
Exceptional items gross |  |  |
Exceptional items tax |  |  |
Exceptional items net |  |  |
Discontinued operations [member] | Attributable to BHP shareholders [member] |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |
Exceptional items gross |  |  | (2,859)
Exceptional items tax |  | 492 | 601
Exceptional items net |  | $ 492 | $ (2,258)

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