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Share Capital - Additional Information (Detail)	12 Months Ended
	Jun. 30, 2020 $ / shares shares	Jun. 30, 2020 £ / shares shares	Jun. 30, 2019 $ / shares	Jun. 30, 2019 £ / shares	Jun. 30, 2018 $ / shares	Jun. 30, 2018 £ / shares	Feb. 23, 2016 $ / shares
Disclosure of classes of share capital [line items]
Ordinary shares, per cent of total number of shares	99.99%	99.99%
BHP Group Limited [member]
Disclosure of classes of share capital [line items]
Shares, par value | $ / shares	$ 0.50
BHP Group Plc [member]
Disclosure of classes of share capital [line items]
Shares, par value | $ / shares	$ 0.50
Special Voting share of no par value [member] | BHP Group Limited [member]
Disclosure of classes of share capital [line items]
Number of shares issued	1	1
Movement in shares	0
Special Voting share of US$0.50 par value [member] | BHP Group Plc [member]
Disclosure of classes of share capital [line items]
Shares, par value | $ / shares	$ 0.50		$ 0.50		$ 0.50
Number of shares issued	1	1
Movement in shares	0
5.5% Preference shares [member]
Disclosure of classes of share capital [line items]
Shares, par value | £ / shares		£ 1		£ 1		£ 1
5.5% Preference shares [member] | BHP Group Plc [member]
Disclosure of classes of share capital [line items]
Shares, par value | £ / shares		£ 1		£ 1		£ 1
Movement in shares	0
DLC Dividend share [member] | BHP Group Limited [member]
Disclosure of classes of share capital [line items]
Shares, par value | $ / shares							$ 10

X

- Definition

Percentage of ordinary shares in total number of shares.

+ References

No definition available.

+ Details

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X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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X

- Definition

The increase (decrease) in the number of shares outstanding. [Refer: Number of shares outstanding]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 79
-Subparagraph a
-Clause iv
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- Definition

The number of shares issued by the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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-IssueDate 2019-01-01
-Paragraph 106
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X

- Definition

The nominal value per share.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 79
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- Details

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- Details

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- Details

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- Details

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