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Related Party Transactions - Summary of Transactions with Related Parties (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018
Joint operations [member] |  |
Disclosure of transactions between related parties [line items] |  |
Sales of goods/services | $ 0 | $ 0
Interest income | 1,532 | 1,764
Net loans made to/(repayments from) related parties | 12,539 | 60,566
Joint ventures [member] |  |
Disclosure of transactions between related parties [line items] |  |
Sales of goods/services | 0 | 0
Associates [member] |  |
Disclosure of transactions between related parties [line items] |  |
Sales of goods/services | 0 | 0
Purchases of goods/services | 1,141,230 | 1,358,016
Interest income | 826 | 19,337
Interest expense | 11 |
Dividends received | 509,577 | 693,105
Net loans made to/(repayments from) related parties | $ 14,547 | $ (599,979)

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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 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

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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_JointVenturesMember
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: |