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Exceptional Items - Additional Information (Detail) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2018 | Dec. 31, 2017 | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) kt | Jun. 30, 2016 USD ($)
Disclosure of exceptional items [Line Items] |  |  |  |  |
Exceptional gain (loss), before tax |  |  | $ 650 | $ 763 | $ 2,520
US corporate tax rate |  |  | 30.00% | 30.00% | 30.00%
Taxation (income) charges related to exceptional items |  |  | $ 2,320 | $ 243 | $ 247
Exceptional gain (loss), after tax |  |  | (2,970) | (1,006) | (2,767)
One-off dividend to parent |  |  | 6,720 | 3,472 | 4,326
Samarco dam failure [member] |  |  |  |  |
Disclosure of exceptional items [Line Items] |  |  |  |  |
Exceptional gain (loss), before tax |  |  | 650 | 381 | 2,450
Taxation (income) charges related to exceptional items |  |  |  |  | (253)
Exceptional gain (loss), after tax |  |  | (650) | (381) | $ (2,197)
US tax reform [Member] |  |  |  |  |
Disclosure of exceptional items [Line Items] |  |  |  |  |
Exceptional gain (loss), before tax |  |  | 2,320 |  |
US corporate tax rate | 21.00% | 35.00% |  |  |
Taxation (income) charges related to exceptional items |  |  | 2,320 |  |
Exceptional gain (loss), after tax |  |  | $ (2,320) |  |
Escondida industrial action [member] |  |  |  |  |
Disclosure of exceptional items [Line Items] |  |  |  |  |
Exceptional gain (loss), before tax |  |  |  | 546 |
Taxation (income) charges related to exceptional items |  |  |  | $ (179) |
Reduction in copper production | kt |  |  |  | 214 |
Depreciation |  |  |  | $ 212 |
Exceptional gain (loss), after tax |  |  |  | (367) |
Cancellation of the Caroona exploration licence [member] |  |  |  |  |
Disclosure of exceptional items [Line Items] |  |  |  |  |
Exceptional gain (loss), before tax |  |  |  | (164) |
Taxation (income) charges related to exceptional items |  |  |  | 49 |
Exceptional gain (loss), after tax |  |  |  | 115 |
Withholding tax on Chilean dividends [member] |  |  |  |  |
Disclosure of exceptional items [Line Items] |  |  |  |  |
Taxation (income) charges related to exceptional items |  |  |  | 373 |
Exceptional gain (loss), after tax |  |  |  | (373) |
BHP Billiton Chile Inversiones Limitada [member] | Withholding tax on Chilean dividends [member] |  |  |  |  |
Disclosure of exceptional items [Line Items] |  |  |  |  |
One-off dividend to parent |  |  |  | $ 2,300 |

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