Shareholders' equity Dividends Declared (Details)	3 Months Ended
	Mar. 31, 2022 $ / shares	Mar. 31, 2022 SFr / shares	Mar. 31, 2021 $ / shares	Mar. 31, 2021 SFr / shares
United States of America, Dollars
Equity, Class of Treasury Stock [Line Items]
Common Stock, Dividends, Per Share, Declared | $ / shares	$ 0.80		$ 0.78
Switzerland, Francs
Equity, Class of Treasury Stock [Line Items]
Common Stock, Dividends, Per Share, Declared | SFr / shares		SFr 0.74		SFr 0.70