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Segment Reporting - Additional Information (Detail)	12 Months Ended
	Jun. 30, 2023 Segment
Disclosure of operating segments [line items]
Number of reportable segment	3

X

- Definition

Number of reportable segments.

+ References

No definition available.

+ Details

Name:	bhp_NumberOfReportableSegments1
Namespace Prefix:	bhp_
Data Type:	xbrli:integerItemType
Balance Type:	na
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_DisclosureOfOperatingSegmentsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration