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Dividends - Summary of Franking Credits (Parenthetical) (Detail) $ in Millions	12 Months Ended
	Jun. 30, 2018 USD ($)
BHP Billiton Limited [Member]
Disclosure of dividends [Line Items]
Decrease in franking account balance due to payment of final dividend	$ 867

X

- Definition

Decrease in franking credits available due to payment of the final dividend.

+ References

No definition available.

+ Details

Name:	bhp_DecreaseInFrankingCreditsAvailableDueToPaymentOfFinalDividend
Namespace Prefix:	bhp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Disclosure of dividends.

+ References

No definition available.

+ Details

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

X

- Details

Name:	dei_LegalEntityAxis=bhp_BHPBillitonLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: