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Equity - Summary of Equity Share Capital (Parenthetical) (Detail) - £ / shares | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Ordinary shares [Member] | Equity share capital [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Nominal value per share | £ 0.19810 | £ 0.18967 | £ 0.15805 | £ 0.15805

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- Definition The nominal value per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 79 -Subparagraph a -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_79_a_iii&doctype=Standard -URIDate 2017-03-09 + Details
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