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Principal associates - Additional information (Detail) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Significant Investments In Associates [Abstract] |
Description of basis of preparation of summarised financial information of associate | summarised financial information is shown on a 100 per cent basis

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- Definition The description of the basis of preparation of summarised financial information of an associate. [Refer: Associates [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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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | ifrs-full_
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Balance Type: | na
Period Type: | duration