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Discontinued Operations - Summary of Exceptional Items - Discontinued Operations (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |
Exceptional items gross | $ (1,060) | $ (650) | $ (763)
Exceptional items tax | 242 | (2,320) | (243)
Exceptional items net | (818) | (2,970) | (1,006)
US tax reform [member] |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |
Exceptional items tax |  | (2,320) |
Exceptional items net |  | (2,320) |
Non-controlling interests [member] |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |
Exceptional items gross |  |  | (232)
Exceptional items tax |  |  | 68
Exceptional items net |  |  | (164)
Attributable to BHP shareholders [member] |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |
Exceptional items gross | (1,060) | (650) | (531)
Exceptional items tax | 242 | (2,320) | (311)
Exceptional items net | (818) | (2,970) | (842)
Discontinued operations [member] |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |
Exceptional items gross |  | (2,859) |
Exceptional items tax |  | 601 |
Exceptional items net | $ 0 | (2,258) | $ 0
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 |
Exceptional items net |  | 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 |  | 601 |
Exceptional items net |  | $ (2,258) |

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