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Transition risks - Additional information (Detail) $ in Millions	Jul. 31, 2019 USD ($)
Transition Risks [Abstract]
Climate investment program minimum investment amount	$ 400

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- Definition

Climate investment program minimum investment amount.

+ References

No definition available.

+ Details

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Namespace Prefix:	bhp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Transition risks.

+ References

No definition available.

+ Details

Name:	bhp_TransitionRisksAbstract
Namespace Prefix:	bhp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration