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Investments Accounted for Using the Equity Method - Additional Information (Detail) - BHP Billiton Brasil Ltda [member] - Samarco Mineracao S.A. [member] - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Disclosure of significant investments in associates and joint ventures [Line Items]
Commitment percentage	50.00%	50.00%
Commitments in relation to joint ventures	$ 550	$ 750

X

- Definition

Commitment percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	bhp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Disclosure of significant investments in associates and joint ventures.

+ References

No definition available.

+ Details

Name:	bhp_DisclosureOfSignificantInvestmentsInAssociatesAndJointVenturesLineItems
Namespace Prefix:	bhp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The commitments that the entity has relating to its joint ventures as specified in paragraphs B18-B20 of IFRS 12. [Refer: Joint ventures [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2017-01-01
-Paragraph 23
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_23_a&doctype=Standard
-URIDate 2017-03-09

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	dei_LegalEntityAxis=bhp_BHPBillitonBrasilLtdaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Period Type: