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Related Party Transactions - Additional Information (Detail) - USD ($) | 12 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Disclosure of transactions between related parties [abstract] |  |
Guarantees provided for related party receivables or payables | $ 0 |
Guarantees received for related party receivables or payables | 0 |
Provision for expected credit losses | 0 |
Expense for expected credit losses due from related parties | 0 |
Other related party transactions | $ 0 | $ 0

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

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- References No definition available. + Details
Name: | ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of expense recognised during the period in respect of bad or doubtful debts due from related parties. [Refer: Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2020-01-01 -Paragraph 18 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2020-en-r&anchor=para_18_d&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_ExpenseRecognisedDuringPeriodForBadAndDoubtfulDebtsForRelatedPartyTransaction
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of guarantees or collateral provided by the entity in related party transactions. [Refer: Guarantees [member]; Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 24 -IssueDate 2020-01-01 -Paragraph 21 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2020-en-r&anchor=para_21_h&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_ProvisionOfGuaranteesOrCollateralByEntityRelatedPartyTransactions
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of guarantees or collateral provided to the entity in related party transactions. [Refer: Guarantees [member]; Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 24 -IssueDate 2020-01-01 -Paragraph 21 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2020-en-r&anchor=para_21_h&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_ProvisionOfGuaranteesOrCollateralToEntityRelatedPartyTransactions
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of provisions for doubtful debts related to the amount of outstanding balances in related party transactions. [Refer: Provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2020-01-01 -Paragraph 18 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2020-en-r&anchor=para_18_c&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_ProvisionsForDoubtfulDebtsRelatedToOutstandingBalancesOfRelatedPartyTransaction
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant