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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

X

- Definition

Provisional pricing period.

+ References

No definition available.

+ Details

Name:	bhp_ProvisionalPricingPeriod
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: