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Entities accounted under the equity method Principal joint ventures - Summary of joint ventures (Detail)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Matalco Canada Inc.
Disclosure Of Joint Ventures And Associates [Line Items]
Group interest (%)	50.00%
Minera Escondida Ltda
Disclosure Of Joint Ventures And Associates [Line Items]
Group interest (%)	30.00%	30.00%
Sohar Aluminium Co. L.L.C.
Disclosure Of Joint Ventures And Associates [Line Items]
Group interest (%)	20.00%
Matalco USA, LLC
Disclosure Of Joint Ventures And Associates [Line Items]
Group interest (%)	50.00%

X

- Definition

The proportion of ownership interest in a joint venture attributable to the entity. [Refer: Total for all joint ventures [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2024-01-01
-Paragraph 17
-Subparagraph b
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2024-en-r&anchor=para_17_b_iii&doctype=Standard
-URIDate 2024-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2024-01-01
-Paragraph 16
-Subparagraph b
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2024-en-r&anchor=para_16_b_iii&doctype=Standard
-URIDate 2024-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2024-01-01
-Paragraph 21
-Subparagraph a
-Clause iv
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_21_a_iv&doctype=Standard
-URIDate 2024-03-27

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- Definition

Disclosure Of Joint Ventures And Associates

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