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Combined Earnings Per Share - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2017
Earnings per share [Abstract] |
Description on diluted earnings per share and underlying earnings per share calculation | In calculating diluted earnings per share and underlying earnings per share, a number of adjustments are made to the number of shares, principally, the exercise of share options by employees.

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- Definition The reconciliation of the denominators used in calculating basic and diluted earnings per share to each other. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2016-01-13 -Paragraph 70 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=33&date=2016-03-30&anchor=para_70_b&doctype=Standard -URIDate 2016-03-31 + Details
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