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Investments Accounted for Using the Equity Method - Additional Information (Detail) $ in Millions | 12 Months Ended
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Jun. 30, 2020 USD ($) $ / Per_tonne | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($)
Disclosure of significant investments in associates and joint ventures [line items] |  |  |
Carrying amount of investments accounted for using the equity method | $ 2,585 | $ 2,569 | $ 2,473
Impairment loss | $ 494 | 264 | $ 333
Short Term Range [Member] |  |  |
Disclosure of significant investments in associates and joint ventures [line items] |  |  |
Price per tonne of coal | $ / Per_tonne | 45 |  |
Long Term Range [Member] |  |  |
Disclosure of significant investments in associates and joint ventures [line items] |  |  |
Price per tonne of coal | $ / Per_tonne | 65 |  |
Carbones del Cerrejon LLC [member] |  |  |
Disclosure of significant investments in associates and joint ventures [line items] |  |  |
Carrying amount of investments accounted for using the equity method | $ 776 | $ 853 |
Impairment loss | $ 0 |  |
Post tax discount rate | 9.50% |  |
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 | $ 200 | $ 250 |

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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 2019-01-01 -Paragraph 23 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_23_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The discount rate applied to cash flow projections for a cash-generating unit (group of units). [Refer: Cash-generating units [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2019-01-01 -Paragraph 134 -Subparagraph d -Clause v -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2019-en-r&anchor=para_134_d_v&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2019-01-01 -Paragraph 134 -Subparagraph e -Clause v -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2019-en-r&anchor=para_134_e_v&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2019-01-01 -Paragraph 24 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2019-en-r&anchor=para_24_a&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2019-01-01 -Paragraph B16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_B16&doctype=Appendix&subtype=B -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_e&doctype=Standard -URIDate 2019-03-27 + Details
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