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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, 2021 | Jun. 30, 2020
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Disclosure of financial liabilities [abstract] |  |
Input taxes | $ 176 | $ 145

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- Definition Input tax payable. + References 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
Balance Type: | na
Period Type: | duration