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Interests in Joint Operations - Summary of Significant Interests in Joint Operations (Parenthetical) (Detail) | 12 Months Ended
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Jun. 30, 2020
Joint Operation [member] |
Disclosure of joint operations [line items] |
Percentage of ownership interests in joint operations | 50.00%

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- Definition Proportion of ownership interest in joint operation control threshold. + References No definition available. + Details
Name: | bhp_ProportionOfOwnershipInterestInJointOperationControlThreshold
Namespace Prefix: | bhp_
Data Type: | num:percentItemType
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 domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfJointOperationsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_JointOperationsAxis=bhp_JointOperationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |