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Related Party Transactions - Summary of Transactions with Related Parties (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023
Joint ventures [member] |  |
Disclosure of transactions between related parties [line items] |  |
Sales of goods/services |  |
Purchases of goods/services |  |
Interest income |  |
Interest expense |  |
Dividends received |  |
Net loans made to/(repayments from) related parties |  |
Associates [member] |  |
Disclosure of transactions between related parties [line items] |  |
Sales of goods/services |  |
Purchases of goods/services | 1,606,639 | 1,589,094
Interest income |  |
Interest expense |  |
Dividends received | 396,856 | 327,679
Net loans made to/(repayments from) related parties |  |

X
- Definition Dividends received related party transactions. + References No definition available. + Details
Name: | bhp_DividendsReceivedRelatedPartyTransactions
Namespace Prefix: | bhp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Interest expense related party transactions. + References No definition available. + Details
Name: | bhp_InterestExpenseRelatedPartyTransactions
Namespace Prefix: | bhp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Interest income related party transactions . + References No definition available. + Details
Name: | bhp_InterestIncomeRelatedPartyTransactions
Namespace Prefix: | bhp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Net loans made to repayments from related parties. + References No definition available. + Details
Name: | bhp_NetLoansMadeToRepaymentsFromRelatedParties
Namespace Prefix: | bhp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Purchases of goods and services received, related party transactions. + References No definition available. + Details
Name: | bhp_PurchasesOfGoodsAndServicesReceivedRelatedPartyTransactions
Namespace Prefix: | bhp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Revenue from sale of goods and services related party transactions. + References No definition available. + Details
Name: | bhp_RevenueFromSaleOfGoodsAndServicesRelatedPartyTransactions
Namespace Prefix: | bhp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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
Name: | ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=ifrs-full_JointVenturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=ifrs-full_AssociatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |