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Investments Accounted for Using the Equity Method - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Carbonesdel Cerrejon Limited Liability Corporation [member] | Non-current assets held for sale [member] |  |
Disclosure of significant investments in associates and joint ventures [line items] |  |
Investments in associates accounted for using equity method | $ 284 |
Loans receivable, related party transactions | 40 |
Carbonesdel Cerrejon Limited Liability Corporation [member] | Liabilities Included In Disposal Groups Classified As Held For Sale [Member] |  |
Disclosure of significant investments in associates and joint ventures [line items] |  |
Amounts payable, related party transactions | $ 17 |
BHP Brasil Ltda [member] | Samarco Mineracao S.A. [member] |  |
Disclosure of significant investments in associates and joint ventures [line items] |  |
Commitment percentage | 50.00% | 50.00%
Commitments in relation to joint ventures | $ 350 | $ 200

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- Definition The amounts payable resulting from related party transactions. [Refer: Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2020-01-01 -Paragraph 20 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2020-en-r&anchor=para_20&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2020-01-01 -Paragraph 18 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2020-en-r&anchor=para_18_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The commitments that the entity has relating to its joint ventures as specified in paragraphs B18-B20 of IFRS 12. [Refer: Joint ventures [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph 23 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_23_a&doctype=Standard -URIDate 2020-01-01 + Details
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