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Subsequent events (Details) - Feb. 25, 2020 - Potential ordinary share transactions [member] $ in Millions	USD ($)	SFr / shares
Disclosure of non-adjusting events after reporting period [line items]
Dividends declared (per share) | SFr / shares		SFr 0.19
Dividends declared, amount | $	$ 95

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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- Definition

The amount of dividends proposed or declared after the reporting period but before financial statements are authorised for issue. Such dividends are not recognised as a liability at the end of the reporting period because no obligation exists at that time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 1
-IssueDate 2019-01-01
-Paragraph 137
-Subparagraph a
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-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2019-01-01
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- Definition

The amount, per share, of dividends proposed or declared before financial statements were authorised for issue but not recognised as distribution to owners.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 137
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-URIDate 2019-03-27

+ Details

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