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Discontinued Operations - Additional Information (Detail) - USD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2018 | Sep. 28, 2018 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |
Total comprehensive income (loss) attributable to BHP shareholders |  |  | $ (11,352) | $ (7,898) | $ (8,282)
Discontinued operations [member] |  |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |
Total comprehensive income (loss) attributable to BHP shareholders |  |  |  |  | $ 342
BHP Billiton Petroleum (Arkansas) Inc. [member] | Discontinued operations [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] | Discontinued operations [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] | Discontinued operations [member] |  |  |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |  |  |
Agreement purchase price |  | $ 300 |  |  |
Petrohawk Energy Corporation [member] | Discontinued operations [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 |  |  |  |

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