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Subsequent Events - Additional Information (Detail) $ in Millions, $ in Billions | Aug. 17, 2021 USD ($) | Aug. 17, 2021 CAD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($)
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Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |
Major growth investment commitments |  |  | $ 2,469 | $ 2,585 |
Property, plant and equipment |  |  | $ 73,813 | $ 72,362 | $ 68,041
Proposed Merger of Petroleum Assets with Woodside [Member] | Petroleum [member] |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |
Property, plant and equipment | $ 11,900 |  |  |  |
Closure and rehabilitation provisions | $ 3,900 |  |  |  |
Proposed Merger of Petroleum Assets with Woodside [Member] | Petroleum [member] | Woodside [Member] |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |
Percentage of ownership interest held In merged entity | 52.00% | 52.00% |  |  |
Proposed Merger of Petroleum Assets with Woodside [Member] | Petroleum [member] | BHP Group [Member] |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |
Percentage of ownership interest held In merged entity | 48.00% | 48.00% |  |  |
Jansen Stage 1 Potash Project [Member] |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |
Major growth investment commitments | $ 5,700 | $ 7.5 |  |  |

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