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Shareholders' equity Dividends Declared (Details)	3 Months Ended				9 Months Ended
	Sep. 30, 2021 SFr / shares	Sep. 30, 2021 $ / shares	Sep. 30, 2020 SFr / shares	Sep. 30, 2020 $ / shares	Sep. 30, 2021 SFr / shares	Sep. 30, 2021 $ / shares	Sep. 30, 2020 SFr / shares	Sep. 30, 2020 $ / shares
United States of America, Dollars
Equity, Class of Treasury Stock [Line Items]
Common Stock, Dividends, Per Share, Declared | $ / shares		$ 0.80		$ 0.78		$ 2.38		$ 2.31
Switzerland, Francs
Equity, Class of Treasury Stock [Line Items]
Common Stock, Dividends, Per Share, Declared | SFr / shares	SFr 0.73		SFr 0.71		SFr 2.14		SFr 2.18

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

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- Definition

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+ References

No definition available.

+ Details

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