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Investments Accounted for Using the Equity Method - Summary of Movements of Investments Accounted for using the Equity Method (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018
Disclosure of significant investments in associates and joint ventures [line items] |  |  |
Impairment charges | $ (494) | $ (264) | $ (333)
(Loss)/profit from equity accounted investments, related impairments and expenses | (512) | $ (546) | $ 147
Funding provided during the period | (242) |  |
Samarco germano dam decommissioning [member] |  |  |
Disclosure of significant investments in associates and joint ventures [line items] |  |  |
Change in estimate | (37) |  |
Exchange translation | 83 |  |
Samarco Germano dam decommissioning | 46 |  |
Joint ventures [member] |  |  |
Disclosure of significant investments in associates and joint ventures [line items] |  |  |
(Loss)/profit from equity accounted investments, related impairments and expenses | (508) |  |
Funding provided during the period | (95) |  |
Joint ventures [member] | Samarco dam failure [member] |  |  |
Disclosure of significant investments in associates and joint ventures [line items] |  |  |
Impairment charges | (95) |  |
(Loss)/profit from equity accounted investments, related impairments and expenses | (508) |  |
Funding provided during the period | (95) |  |
Samarco dam failure provision | (459) |  |
Change in estimate | (916) |  |
Exchange translation | $ 457 |  |

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- Definition The amount recognised as a reduction of the carrying amount of an asset or cash-generating unit to its recoverable amount. [Refer: Carrying amount [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2019-01-01 -Paragraph 130 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2019-en-r&anchor=para_130_b&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2019-01-01 -Paragraph 130 -Subparagraph d -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2019-en-r&anchor=para_130_d_ii&doctype=Standard -URIDate 2019-03-27 + Details
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