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Earnings Per Share - Additional Information (Detail) - shares	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020
Earnings per share [abstract]
Effect of dilutive shares	10,000,000	11,000,000	12,000,000
Antidilutive shares	0	0	0

X

- Definition

Antidilutive securities with dilutive effect not included in calculation of diluted earnings per share.

+ References

No definition available.

+ Details

Name:	bhp_AntidilutiveSecuritiesWithDilutiveEffectNotIncludedInCalculationOfDilutedEarningsPerShare
Namespace Prefix:	bhp_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

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- Definition

The number of dilutive potential ordinary shares that relate to the assumed exercise of the entity's share options.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 33
-IssueDate 2021-01-01
-Paragraph 70
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2021-en-r&anchor=para_70_b&doctype=Standard
-URIDate 2021-03-24

+ Details

Name:	ifrs-full_DilutiveEffectOfShareOptionsOnNumberOfOrdinaryShares
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	ifrs-full_EarningsPerShareAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration