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Interests in Joint Operations - Summary of Significant Interests in Joint Operations (Parenthetical) (Detail)	12 Months Ended
	Jun. 30, 2020
Joint Operation [member]
Disclosure of joint operations [line items]
Percentage of ownership interests in joint operations	50.00%

X

- Definition

Proportion of ownership interest in joint operation control threshold.

+ References

No definition available.

+ Details

Name:	bhp_ProportionOfOwnershipInterestInJointOperationControlThreshold
Namespace Prefix:	bhp_
Data Type:	num:percentItemType
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_DisclosureOfJointOperationsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_JointOperationsAxis=bhp_JointOperationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: