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Exceptional Items - Summary of Exceptional Items by Category (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Disclosure of exceptional items [line items] |  |  |
Exceptional items gross | $ (1,060) | $ (650) | $ (763)
Exceptional items tax | 242 | (2,320) | (243)
Exceptional items net | (818) | (2,970) | (1,006)
Samarco dam failure [member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Exceptional items gross | (1,060) | (650) | (381)
Exceptional items tax | 0 | 0 | 0
Exceptional items net | (1,060) | (650) | (381)
Global taxation matters [member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Exceptional items tax | 242 |  |
Exceptional items net | 242 |  |
US tax reform [member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Exceptional items tax |  | (2,320) |
Exceptional items net |  | (2,320) |
Escondida industrial action [member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Exceptional items gross |  |  | (546)
Exceptional items tax |  |  | 179
Exceptional items net |  |  | (367)
Cancellation of the Caroona exploration licence [member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Exceptional items gross |  |  | 164
Exceptional items tax |  |  | (49)
Exceptional items net |  |  | 115
Withholding tax on Chilean dividends [member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Exceptional items tax |  |  | (373)
Exceptional items net |  |  | (373)
Non-controlling interests [member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Exceptional items gross |  |  | (232)
Exceptional items tax |  |  | 68
Exceptional items net |  |  | (164)
Attributable to BHP shareholders [member] |  |  |
Disclosure of exceptional items [line items] |  |  |
Exceptional items gross | (1,060) | (650) | (531)
Exceptional items tax | 242 | (2,320) | (311)
Exceptional items net | $ (818) | $ (2,970) | $ (842)

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