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Net Debt - Summary of Maturity Profile of Financial Liabilities Based on the Contractual Amounts (Parenthetical) (Detail) - USD ($) $ in Millions	Jun. 30, 2019	Jun. 30, 2018
Disclosure of financial liabilities [abstract]
Input taxes	$ 162	$ 189

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- Definition

Input tax payable.

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No definition available.

+ Details

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

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- References

No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
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