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Net Finance Costs - Summary of Net Finance Costs (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Disclosure of finance income costs [abstract]
Interest capitalised	4.14%	4.96%	4.24%
Tax relief for capitalised interest	$ 92	$ 74	$ 42

X

- Definition

Disclosure of finance income costs.

+ References

No definition available.

+ Details

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

X

- Definition

Approximate tax relief related to capitalised interest.

+ References

No definition available.

+ Details

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Namespace Prefix:	bhp_
Data Type:	xbrli:monetaryItemType
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X

- Definition

The weighted average of interest and other costs that an entity incurs in connection with the borrowing of funds applicable to the borrowings of the entity that are outstanding during the period, other than borrowings made specifically for the purpose of obtaining a qualifying asset. [Refer: Weighted average [member]; Borrowings]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 23
-IssueDate 2019-01-01
-Paragraph 26
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=23&code=ifrs-tx-2019-en-r&anchor=para_26_b&doctype=Standard
-URIDate 2019-03-27

+ Details

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