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Discontinued Operations - Additional Information (Detail) - USD ($) $ in Millions |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 27, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Disclosure of discontinued operations [line items] |  |  |  |  |  |
Total comprehensive income (loss) attributable to BHP shareholders |  |  |  | $ 3,608 | $ 5,841 | $ (6,360)
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
US tax reform [Member] |  |  |  |  |  |
Disclosure of discontinued operations [line items] |  |  |  |  |  |
US corporate tax rate |  | 21.00% | 35.00% |  |  |
Taxation (income) charges related to exceptional items |  |  |  | (2,320) |  |
Exceptional gain (loss), after tax |  |  |  | 2,320 |  |
Impairment of Onshore US assets [member] |  |  |  |  |  |
Disclosure of discontinued operations [line items] |  |  |  |  |  |
Exceptional gain (loss), after tax |  |  |  |  |  | 4,884
Discontinued Operations - Onshore US Cash Generating Units [Member] |  |  |  |  |  |
Disclosure of discontinued operations [line items] |  |  |  |  |  |
Goodwill |  |  |  |  | 3,022 |
Discontinued operations [member] |  |  |  |  |  |
Disclosure of discontinued operations [line items] |  |  |  |  |  |
Total comprehensive income (loss) attributable to BHP shareholders |  |  |  | (2,943) | $ (489) | (5,846)
Taxation (income) charges related to exceptional items |  |  |  | 601 |  | 2,300
Exceptional gain (loss), after tax |  |  |  | 2,258 |  | 4,884
Discontinued operations [member] | US tax reform [Member] |  |  |  |  |  |
Disclosure of discontinued operations [line items] |  |  |  |  |  |
Taxation (income) charges related to exceptional items |  |  |  | 492 |  |
Exceptional gain (loss), after tax |  |  |  | (492) |  |
Discontinued operations [member] | Impairment of Onshore US assets [member] |  |  |  |  |  |
Disclosure of discontinued operations [line items] |  |  |  |  |  |
Taxation (income) charges related to exceptional items |  |  |  | 109 |  | 2,300
Exceptional gain (loss), after tax |  |  |  | $ 2,750 |  | $ 4,884
Announcement of plan to discontinue operation [member] | Discontinued Operations - Onshore US Cash Generating Units [Member] |  |  |  |  |  |
Disclosure of discontinued operations [line items] |  |  |  |  |  |
Agreement purchase price | $ 10,800 |  |  |  |  |
Announcement of plan to discontinue operation [member] | Petrohawk [member] |  |  |  |  |  |
Disclosure of discontinued operations [line items] |  |  |  |  |  |
Agreement purchase price | $ 10,500 |  |  |  |  |
Percentage of issued share capital to be sold | 100.00% |  |  |  |  |
Percentage of consideration to be paid in cash at completion | 50.00% |  |  |  |  |
Percentage of deferred consideration | 50.00% |  |  |  |  |
Announcement of plan to discontinue operation [member] | BHP Billiton Petroleum (Arkansas) Inc. [member] |  |  |  |  |  |
Disclosure of discontinued operations [line items] |  |  |  |  |  |
Percentage of issued share capital to be sold | 100.00% |  |  |  |  |
Announcement of plan to discontinue operation [member] | BHP Billiton Petroleum (Fayetteville) LLC [member] |  |  |  |  |  |
Disclosure of discontinued operations [line items] |  |  |  |  |  |
Percentage of issued share capital to be sold | 100.00% |  |  |  |  |
Announcement of plan to discontinue operation [member] | BHP Billiton Petroleum (Arkansas) Inc. and BHP Billiton Petroleum (Fayetteville) LLC [member] |  |  |  |  |  |
Disclosure of discontinued operations [line items] |  |  |  |  |  |
Agreement purchase price | $ 300 |  |  |  |  |

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