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Principal joint ventures - Summary of joint ventures (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2019
Minera Escondida Limitada [Member]
Disclosure of joint ventures [line items]
Group interest (%)	30.00%
Minera Escondida Limitada [Member] | BHP Billiton
Disclosure of joint ventures [line items]
Group interest (%)	57.50%
Sohar Aluminium Co. L.L.C.
Disclosure of joint ventures [line items]
Group interest (%)	20.00%

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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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
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-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
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2019-01-01
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-Subparagraph a
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