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Shareholders' equity Dividends Declared (Details)	3 Months Ended
Shareholders' equity Dividends Declared (Details)	Mar. 31, 2021 $ / shares	Mar. 31, 2021 SFr / shares	Mar. 31, 2020 $ / shares	Mar. 31, 2020 SFr / shares	May 20, 2020 $ / shares	May 31, 2019 $ / shares
Equity, Class of Treasury Stock [Line Items]
Annual dividend per share approved by shareholders					$ 3.12	$ 3.00
Common Stock, Dividend Rate Approved					$ 0.78	$ 0.75
United States of America, Dollars
Equity, Class of Treasury Stock [Line Items]
Common Stock, Dividends, Per Share, Declared	$ 0.78		$ 0.75
Switzerland, Francs
Equity, Class of Treasury Stock [Line Items]
Common Stock, Dividends, Per Share, Declared \| SFr / shares		SFr 0.70		SFr 0.72