Consolidated Statement of Changes in Equity (Parenthetical) - SFr / shares	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Ordinary cash dividends paid, ordinary shares per share	SFr 0.65	SFr 0.6

The amount of dividends paid per ordinary share.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 34
-IssueDate 2016-01-13
-Paragraph 16A
-Subparagraph f
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=34&date=2016-03-30&anchor=para_16A_f&doctype=Standard
-URIDate 2016-03-31

Name:	ifrs-full_DividendsPaidOrdinarySharesPerShare
Namespace Prefix:	ifrs-full_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration