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Exceptional Items - Summary of Exceptional Items by Category (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Disclosure of exceptional items [Line Items] |  |  |
Exceptional items gross | $ (650) | $ (763) | $ (2,520)
Exceptional items tax | (2,320) | (243) | (247)
Exceptional gain (loss), after tax | (2,970) | (1,006) | (2,767)
Samarco dam failure [member] |  |  |
Disclosure of exceptional items [Line Items] |  |  |
Exceptional items gross | (650) | (381) | (2,450)
Exceptional items tax |  |  | 253
Exceptional gain (loss), after tax | (650) | (381) | (2,197)
US tax reform [Member] |  |  |
Disclosure of exceptional items [Line Items] |  |  |
Exceptional items gross | (2,320) |  |
Exceptional items tax | (2,320) |  |
Exceptional gain (loss), after tax | (2,320) |  |
Escondida industrial action [member] |  |  |
Disclosure of exceptional items [Line Items] |  |  |
Exceptional items gross |  | (546) |
Exceptional items tax |  | 179 |
Exceptional gain (loss), after tax |  | (367) |
Cancellation of the Caroona exploration licence [member] |  |  |
Disclosure of exceptional items [Line Items] |  |  |
Exceptional items gross |  | 164 |
Exceptional items tax |  | (49) |
Exceptional gain (loss), after tax |  | 115 |
Withholding tax on Chilean dividends [member] |  |  |
Disclosure of exceptional items [Line Items] |  |  |
Exceptional items tax |  | (373) |
Exceptional gain (loss), after tax |  | (373) |
Global taxation matters [Member] |  |  |
Disclosure of exceptional items [Line Items] |  |  |
Exceptional items gross |  |  | (70)
Exceptional items tax |  |  | (500)
Exceptional gain (loss), after tax |  |  | (570)
Non-controlling interests [Member] |  |  |
Disclosure of exceptional items [Line Items] |  |  |
Exceptional items gross |  | (232) |
Exceptional items tax |  | 68 |
Exceptional gain (loss), after tax |  | (164) |
Attributable to BHP shareholders [member] |  |  |
Disclosure of exceptional items [Line Items] |  |  |
Exceptional items gross | (650) | (531) | (2,520)
Exceptional items tax | (2,320) | (311) | (247)
Exceptional gain (loss), after tax | $ (2,970) | $ (842) | $ (2,767)

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