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Principal joint ventures - Additional information (Detail) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Joint Ventures [Abstract] |
Description of basis of preparation of summarized financial information of joint venture | Summarised financial information is shown on a 100 per cent basis. It represents the amounts shown in the joint ventures’ financial statements prepared in accordance with IFRS under Group accounting policies, including fair value adjustments and amounts due to and from Rio Tinto.

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- Definition The description of the basis of preparation of summarised financial information of a joint venture. [Refer: Joint ventures [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2016-01-13 -Paragraph B15 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2016-03-30&anchor=para_B15&doctype=Appendix&seq=2 -URIDate 2016-03-31 + Details
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- References No definition available. + Details
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