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Income Tax Expense - Summary of Income Tax Recognised in Other Comprehensive Income (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022
Major components of tax expense (income) [abstract]
Income tax relating to components of other comprehensive income, deferred taxes	$ (18)	$ 12	$ 1
Income tax relating to components of other comprehensive income, current taxes

X

- Definition

Current income tax relating to components of other comprehensive income.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

Deferred income tax relating to components of other comprehensive income.

+ References

No definition available.

+ Details

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

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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