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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
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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

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- 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

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- 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

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

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

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- Details
Name: | ifrs-full_JointVenturesAxis=bhp_SamarcoMineracaoSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |