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Combined Earnings Per Share - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2018
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.

+ Details

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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 2017-01-01
-Paragraph 70
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=33&date=2017-03-01&anchor=para_70_b&doctype=Standard
-URIDate 2017-03-09

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