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Leases - Summary of Movements in Lease Liabilities (Parentheticals) (Detail) - Lease liabilities [member] - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Lease payments	$ (1,288)	$ (879)
Discontinued operations [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Lease payments	$ 39	$ 45

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- Definition

Lease Payment

+ References

No definition available.

+ Details

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Namespace Prefix:	bhp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis=ifrs-full_LeaseLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ContinuingAndDiscontinuedOperationsAxis=ifrs-full_DiscontinuedOperationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: