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Combined Earnings Per Share - Additional Information (Detail)	12 Months Ended
	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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- References

No definition available.

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- Definition

The reconciliation of the denominators used in calculating basic and diluted earnings per share to each other.

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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

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