Deferred consideration divestiture of interest in a subsidiary.

No definition available.

Name:	bhp_DeferredConsiderationDivestitureOfInterestInASubsidiary
Namespace Prefix:	bhp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Disclosure of detailed information about gain on disposal of subsidiary.

+ References

No definition available.

+ Details

Name:	bhp_DisclosureOfDetailedInformationAboutGainOnDisposalOfSubsidiaryLineItems
Namespace Prefix:	bhp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Gain loss recognised on measurement to fair value less costs to sell on disposal of subsidiaries and operations.

+ References

No definition available.

+ Details

Name:	bhp_GainLossRecognisedOnMeasurementToFairValueLessCostsToSellOnDisposalOfSubsidiariesAndOperations
Namespace Prefix:	bhp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Share of net assets demerged.

+ References

No definition available.

+ Details

Name:	bhp_ShareOfNetAssetsDemerged
Namespace Prefix:	bhp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Transaction costs on disposal.

+ References

No definition available.

+ Details

Name:	bhp_TransactionCostsOnDisposal
Namespace Prefix:	bhp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The portion of consideration paid or received, consisting of cash and cash equivalents, in respect of both obtaining and losing control of subsidiaries or other businesses. [Refer: Subsidiaries [member]; Cash and cash equivalents; Consideration paid (received)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 7
-IssueDate 2022-03-24
-Paragraph 40
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2022-en-r&anchor=para_40_b&doctype=Standard
-URIDate 2022-03-24

+ Details

Name:	ifrs-full_PortionOfConsiderationPaidReceivedConsistingOfCashAndCashEquivalents
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=bhp_BhpMitsuiCoalPtyLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	bhp_ExceptionalItemsAxis=bhp_BhpMitsuiCoalOrBmcGainOnDisposalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Exceptional Items - Summary of Gain on Disposal (Detail) - USD ($) $ in Millions		12 Months Ended
	May 03, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Disclosure of Detailed Information About Gain on Disposal of Subsidiary [Line Items]
Gross consideration			$ 683
Gain on disposal		$ 8	840	$ (2)
BHP Mitsui Coal Pty Ltd [member] \| BHP Mitsui Coal or BMC Gain on Disposal [Member]
Disclosure of Detailed Information About Gain on Disposal of Subsidiary [Line Items]
BHP share of net assets disposed			631
Gross consideration			1,318
Transaction and other directly applicable costs			(69)
Deferred consideration	$ 222		222
Gain on disposal			$ 840