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Auditor's Remuneration - Additional Information (Detail) - USD ($)	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Auditors remuneration [line items]
Tax compliance services	$ 537,000	$ 657,000	$ 631,000
Tax compliance services [member]
Auditors remuneration [line items]
Tax compliance services	13,000	0	27,000
Pension funds [member]
Auditors remuneration [line items]
Fees payable in respect of the audit of pension funds	$ 0	$ 0	$ 0

X

- Definition

Auditors remuneration.

+ References

No definition available.

+ Details

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Namespace Prefix:	bhp_
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Balance Type:	na
Period Type:	duration

X

- Definition

The amount of fees paid or payable to the entity's auditors for auditing services.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard
-URIDate 2018-03-16

+ Details

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X

- Definition

The amount of fees paid or payable to the entity's auditors for services that the entity does not separately disclose in the same statement or note.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard
-URIDate 2018-03-16

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- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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