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Net Debt - Additional Information (Detail) - USD ($)	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Disclosure of net debt [line items]
Cash and cash equivalents restricted by legal or contractual arrangements	$ 159,000,000	$ 96,000,000
Defaults on loans payable	0
Revolving credit facility [member]
Disclosure of net debt [line items]
Revolving credit facility, maximum amount	5,500,000,000
Commercial paper, amount drawn	$ 0	$ 0
Revolving credit facility, maturity period	5 year

X

- Definition

Disclosure of net debt line items.

+ References

No definition available.

+ Details

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- Definition

Maximum borrowing capacity.

+ References

No definition available.

+ Details

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Namespace Prefix:	bhp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The maturity of borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 7
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-URIDate 2020-01-01

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- Definition

The amount of commercial paper issued by the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2020-01-01

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Balance Type:	credit
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X

- Definition

The amount of current restricted cash and cash equivalents. [Refer: Restricted cash and cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 55
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X

- Definition

The amount of loans payable in default.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 18
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_18_b&doctype=Standard
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- Details

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Period Type: