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Principal joint ventures - Summary of joint ventures (Detail) - shares | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of joint ventures [line items] |  |  |
Number of shares held | 0 | 0 | 0
Minera Escondida Limitada [Member] |  |  |
Disclosure of joint ventures [line items] |  |  |
Group interest (%) | 30.00% |  |
Sohar Aluminium Co. L.L.C. |  |  |
Disclosure of joint ventures [line items] |  |  |
Group interest (%) | 20.00% |  |
Sohar Aluminium Co. L.L.C. | Ordinary [Member] |  |  |
Disclosure of joint ventures [line items] |  |  |
Number of shares held | 37,500 |  |
Proportion of class held (%) | 20.00% |  |
Group interest (%) | 20.00% |  |

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- Definition The proportion of ownership interest in a joint venture attributable to the entity. [Refer: Joint ventures [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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