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New and Amended Accounting Standards and Interpretations - Summary of Reconciliation of Operating Lease Commitments to Expected Total Lease Liability to be Recognised (Detail) - USD ($) $ in Millions |  | 12 Months Ended
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Jul. 01, 2019 | Jun. 30, 2020
Disclosure of initial application of standards or interpretations [abstract] |  |
Operating lease commitments as at 30 June 2019 | $ 1,905 | $ 1,905
Add: Leases which did not meet the definition of a lease under IAS 17 | 686 |
Add: Cost of reasonably certain extension options (undiscounted) | 91 |
Less: Components excluded from lease liability (undiscounted) | (190) | $ (438)
Less: Effect of discounting | (191) |
Total additional lease liabilities recognised at 1 July 2019 | $ 2,301 |

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- Definition Minimum lease payments payable under operating lease. + References No definition available. + Details
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- Definition Operating lease commitments additional lease liabilities recognised on transition. + References No definition available. + Details
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Namespace Prefix: | bhp_
Data Type: | xbrli:monetaryItemType
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- Definition Operating lease commitments increase decrease in discounting. + References No definition available. + Details
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- Definition Operating lease commitments increase decrease term leases. + References No definition available. + Details
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Namespace Prefix: | bhp_
Data Type: | xbrli:monetaryItemType
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- References No definition available. + Details
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- Definition The amount of the expense relating to variable lease payments not included in the measurement of lease liabilities. Variable lease payments are the portion of payments made by a lessee to a lessor for the right to use an underlying asset during the lease term that varies because of changes in facts or circumstances occurring after the commencement date, other than the passage of time. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 53 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_e&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of right-of-use assets that do not meet the definition of investment property. [Refer: Right-of-use assets; Investment property] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 47 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_47_a&doctype=Standard -URIDate 2019-03-27 + Details
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