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Related Party Transactions - Summary of Transactions with Related Parties (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019
Joint operations [member] |  |
Disclosure of transactions between related parties [line items] |  |
Interest income | $ 1,306 | $ 1,532
Net loans made to/(repayments from) related parties | 4,851 | 12,539
Associates [member] |  |
Disclosure of transactions between related parties [line items] |  |
Purchases of goods/services | 967,276 | 1,141,230
Interest income | 2,370 | 826
Interest expense |  | 11
Dividends received | 126,187 | 509,577
Net loans made to/(repayments from) related parties | $ 12,273 | $ 14,547

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- 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

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- 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

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- 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

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- 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

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- 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

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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_DisclosureOfTransactionsBetweenRelatedPartiesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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