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Interests In Associates And Joint Venture Entities - Summary of Major Shareholdings in Associates and Joint Venture Entities, Including their Profit/(Loss) (Detail) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2019
Disclosure of significant investments in associates and joint ventures [line items] |  |  |  |
Share of operating profit/(loss) of equity accounted investments |  | $ 90 | $ 233 | $ 399
Samarco impairment expense |  | (29) | (168) | (264)
Samarco dam failure provision |  | 56 | (70) | (586)
Profit/(loss) from equity accounted investments, related impairments and expenses |  | $ 126 | $ 116 | $ (546)
Carbones del Cerrejon LLC [member] |  |  |  |
Disclosure of significant investments in associates and joint ventures [line items] |  |  |  |
Ownership interest |  | 33.33% | 33.33% | 33.33%
Share of operating profit/(loss) of equity accounted investments |  | $ (16) | $ 85 | $ 103
Compania Minera Antamina S.A. [member] |  |  |  |
Disclosure of significant investments in associates and joint ventures [line items] |  |  |  |
Ownership interest |  | 33.75% | 33.75% | 33.75%
Share of operating profit/(loss) of equity accounted investments |  | $ 160 | $ 199 | $ 394
Samarco Mineracao S.A. [member] |  |  |  |
Disclosure of significant investments in associates and joint ventures [line items] |  |  |  |
Ownership interest | [1],[2] | 50.00% | 50.00% | 50.00%
Share of operating profit/(loss) of equity accounted investments | [1],[2] | $ 0 |  |
Samarco impairment expense | [1],[2] | (27) | $ (47) | $ (96)
Samarco dam failure provision | [2] | 56 | (70) | (586)
Samarco Germano dam decommissioning | [2] | 7 |  | (263)
Other [member] |  |  |  |
Disclosure of significant investments in associates and joint ventures [line items] |  |  |  |
Share of operating profit/(loss) of equity accounted investments |  | $ (54) | $ (51) | $ (98)
[1] | Following a change to IAS 28 the loss from working capital funding provided during the period will now be disclosed as an impairment included within the Samarco impairment expense line item and not as an operating loss. Comparative periods have been restated to reflect the change.
[2] | Refer to note 9 Significant events – Samarco dam failure for further information.

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- Definition The entity's share of profit (loss) from associates and joint ventures accounted for using the equity method and related impairments and expenses. + References No definition available. + Details
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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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- Definition The increase in existing other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2019-01-01 -Paragraph 84 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2019-en-r&anchor=para_84_b&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The proportion of ownership interest in an associate attributable to the entity. [Refer: Associates [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2019-01-01 -Paragraph 17 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2019-en-r&anchor=para_17_b_iii&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2019-01-01 -Paragraph 16 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2019-en-r&anchor=para_16_b_iii&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2019-01-01 -Paragraph 21 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_21_a_iv&doctype=Standard -URIDate 2019-03-27 + Details
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