Subsidiaries - Summary of Significant Subsidiaries (Parenthetical) (Detail)		12 Months Ended
May 03, 2022	Jun. 30, 2022	Jun. 30, 2021
Disclosure of significant subsidiaries [line items]
Percentage of investment sold	80.00%
BHP Iron Ore (Jimblebar) Pty Ltd [member]
Disclosure of significant subsidiaries [line items]
Effective Group interest		92.50%	92.50%
Group's interest		85.00%	85.00%

The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2021-01-01
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Balance Type:	na
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