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v3.10.0.1

Segment Reporting - Additional Information (Detail) | 12 Months Ended
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Jun. 30, 2018 Segment
Disclosure of reportable segments [Line Items] |
Number of reportable segment | 4
Bottom of range [Member] |
Disclosure of reportable segments [Line Items] |
Period between provisional pricing and final invoicing | 60 days
Top of range [Member] |
Disclosure of reportable segments [Line Items] |
Period between provisional pricing and final invoicing | 120 days

X
- Definition Number of reportable segments. + References No definition available. + Details
Name: | bhp_NumberOfReportableSegments1
Namespace Prefix: | bhp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period between provisional pricing and final invoicing. + References No definition available. + Details
Name: | bhp_PeriodBetweenProvisionalPricingAndFinalInvoicing
Namespace Prefix: | bhp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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
Name: | ifrs-full_DisclosureOfOperatingSegmentsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |