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v3.10.0.1

Revenue - Additional Information (Detail) | 6 Months Ended
--- | ---
Dec. 31, 2018
Bottom of range [Member] |
Disclosure of reportable segments [line items] |
Provisional pricing period | 60 days
Top of range [Member] |
Disclosure of reportable segments [line items] |
Provisional pricing period | 120 days

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- Definition Provisional pricing period. + References No definition available. + Details
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Namespace Prefix: | bhp_
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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
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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: |