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Share Capital - Summary of Share Capital (Parenthetical) (Detail) - shares |  | 12 Months Ended
--- | --- | ---
Jan. 31, 2022 | Jun. 30, 2024 | Jun. 30, 2022
BHP Group Limited [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of shares transferred corporate structure unification | 2,112,071,796 | 0 | 2,112,071,796

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- Definition Number of shares transferred corporate structure unification. + References No definition available. + Details
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Namespace Prefix: | bhp_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | dei_LegalEntityAxis=bhp_BHPGroupLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |