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Discontinued Operations - Additional Information (Detail) - USD ($) $ in Millions |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 31, 2018 | Sep. 28, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |  |  |
Total comprehensive income (loss) attributable to BHP shareholders |  |  |  |  | $ 7,898 | $ 8,282 | $ 3,608
Exceptional items net |  |  |  |  | $ 1,305 | $ 818 | $ 2,970
US corporate tax rate |  |  |  |  | 30.00% | 30.00% | 30.00%
Taxation (income) charges related to exceptional items |  |  |  |  | $ 241 | $ 242 | $ (2,320)
US tax reform [member] |  |  |  |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |  |  |
Exceptional items net |  |  |  |  |  |  | 2,320
US corporate tax rate |  |  | 21.00% | 35.00% |  |  |
Taxation (income) charges related to exceptional items |  |  |  |  |  |  | (2,320)
BHP Billiton Petroleum (Arkansas) Inc. [member] |  |  |  |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |  |  |
Percentage of issued share capital sold |  | 100.00% |  |  |  |  |
BHP Billiton Petroleum (Fayetteville) LLC [member] |  |  |  |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |  |  |
Percentage of issued share capital sold |  | 100.00% |  |  |  |  |
BHP Billiton Petroleum Arkansas and BHP Billiton Petroleum Fayetteville LLC [member] |  |  |  |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |  |  |
Agreement purchase price |  | $ 300 |  |  |  |  |
Petrohawk Energy Corporation [member] |  |  |  |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |  |  |
Percentage of issued share capital sold | 100.00% |  |  |  |  |  |
Agreement purchase price | $ 10,300 |  |  |  |  |  |
Customary completion adjustments | $ (200) |  |  |  |  |  |
Discontinued operations [member] |  |  |  |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |  |  |
Total comprehensive income (loss) attributable to BHP shareholders |  |  |  |  |  | (342) | (2,943)
Exceptional items net |  |  |  |  |  | $ 0 | 2,258
Taxation (income) charges related to exceptional items |  |  |  |  |  |  | 601
Discontinued operations [member] | US tax reform [member] |  |  |  |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |  |  |
Exceptional items net |  |  |  |  |  |  | (492)
Taxation (income) charges related to exceptional items |  |  |  |  |  |  | $ 492

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