Net fair value of financial assets and (liabilities).

No definition available.

Name:	bhp_NetFairValueOfFinancialAssetsAndLiabilities
Namespace Prefix:	bhp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Percentage borrowings with floating rates.

+ References

No definition available.

+ Details

Name:	bhp_PercentageBorrowingsExposedToFloatingRates
Namespace Prefix:	bhp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Risk exposure associated with instruments sharing characteristic, amount of change in risk.

+ References

No definition available.

+ Details

Name:	bhp_RiskExposureAssociatedWithInstrumentsSharingCharacteristicAmountOfChangeInRisk
Namespace Prefix:	bhp_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Risk exposure associated with instruments sharing characteristic, percentage change in risk.

+ References

No definition available.

+ Details

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Namespace Prefix:	bhp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Tonnes of exposure for provisionally priced.

+ References

No definition available.

+ Details

Name:	bhp_TonnesOfExposureForProvisionallyPriced
Namespace Prefix:	bhp_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Transfer between fair value hierarchy categories.

+ References

No definition available.

+ Details

Name:	bhp_TransferBetweenFairValueHierarchyCategories
Namespace Prefix:	bhp_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of outstanding funds that the entity is obligated to repay.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2022-03-24
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_55&doctype=Standard
-URIDate 2022-03-24

+ Details

Name:	ifrs-full_Borrowings
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The adjustment to the basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2022-03-24
-Paragraph 7
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_7&doctype=Standard
-URIDate 2022-03-24

+ Details

Name:	ifrs-full_BorrowingsAdjustmentToInterestRateBasis
Namespace Prefix:	ifrs-full_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings]

+ References

+ Details

Name:	ifrs-full_BorrowingsInterestRateBasis
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfFinancialInstrumentsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash inflow from borrowings obtained. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 7
-IssueDate 2022-03-24
-Paragraph 17
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2022-en-r&anchor=para_17_c&doctype=Standard
-URIDate 2022-03-24

+ Details

Name:	ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of risk exposure associated with financial instruments with a shared characteristic that identifies a concentration of risks. [Refer: Financial instruments, class [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2022-03-24
-Paragraph B8
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_B8_c&doctype=Appendix&subtype=B
-URIDate 2022-03-24

+ Details

Name:	ifrs-full_RiskExposureAssociatedWithInstrumentsSharingCharacteristic
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	ifrs-full_TypesOfRisksAxis=ifrs-full_InterestRateRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfRisksAxis=ifrs-full_CurrencyRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfRisksAxis=ifrs-full_CommodityPriceRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfFinancialAssetsAxis=bhp_ForwardCommodityAndOtherDerivativeContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfFinancialAssetsAxis=bhp_ProvisionallyPricedContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfInterestRatesAxis=bhp_FixedInterestRateNotSwappedToFloatingRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_MeasurementAxis=ifrs-full_AtFairValueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=bhp_OZLAcquisitionFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Financial Risk Management - Additional Information (Detail) t in Thousands, $ in Millions	12 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($) t	Jun. 30, 2021 USD ($)	Jun. 30, 2023 AUD ($) t	Jun. 30, 2023 GBP (£) t	Jun. 30, 2023 EUR (€) t	Jun. 30, 2023 USD ($) t	Jun. 30, 2023 CLP ($) t
Disclosure of detailed information about financial instruments [line items]
Borrowings		$ 13,852					$ 19,326
Transfer between fair value hierarchy categories	$ 0
Percentage of borrowings exposed to floating interest rate	98.00%	80.00%
Weighted average interest rate payable	USD SOFR +1.54 per cent	USD LIBOR + 1.74 per cent
Debt instrument variable interest rate spread		1.74%		1.54%	1.54%	1.54%	1.54%	1.54%
Proceeds from borrowings	$ 8,182	$ 1,164	$ 568
Interest rate risk [member]
Disclosure of detailed information about financial instruments [line items]
Reasonable possible change in risk, percentage				1.00%	1.00%	1.00%	1.00%	1.00%
Effect on equity and profit after taxation, due to reasonable possible change in risk		29					$ 58
Currency risk [member]
Disclosure of detailed information about financial instruments [line items]
Reasonable possible change in risk, amount				$ 0.01	£ 0.01	€ 0.01		$ 10
Effect on equity and profit after taxation, due to reasonable possible change in risk		16					$ 15
Commodity price risk [member]
Disclosure of detailed information about financial instruments [line items]
Reasonable possible change in risk, percentage				10.00%	10.00%	10.00%	10.00%	10.00%
Commodity price risk [member] \| Forward commodity and other derivative contracts [member]
Disclosure of detailed information about financial instruments [line items]
Net fair value of financial assets and (liabilities)		$ 56					$ 20
Commodity price risk [member] \| Provisionally priced contract [member]
Disclosure of detailed information about financial instruments [line items]
Reasonable possible change in risk, percentage				10.00%	10.00%	10.00%	10.00%	10.00%
Tonnes of copper exposure \| t		289		314	314	314	314	314
Effect on equity and profit after taxation, due to reasonable possible change in risk		$ 162					$ 184
Fixed interest rate not swapped to floating rate [member]
Disclosure of detailed information about financial instruments [line items]
Borrowings		3,018					534
Fixed interest rate not swapped to floating rate [member] \| At fair value [member]
Disclosure of detailed information about financial instruments [line items]
Borrowings		$ 3,126					$ 538
OZL acquisition facility [member]
Disclosure of detailed information about financial instruments [line items]
Proceeds from borrowings	$ 5,000