Shareholders' equity Dividends Declared (Details)	3 Months Ended				9 Months Ended
	Sep. 30, 2023 SFr / shares	Sep. 30, 2023 $ / shares	Sep. 30, 2022 SFr / shares	Sep. 30, 2022 $ / shares	Sep. 30, 2023 SFr / shares	Sep. 30, 2023 $ / shares	Sep. 30, 2022 SFr / shares	Sep. 30, 2022 $ / shares
United States of America, Dollars
Equity, Class of Treasury Stock [Line Items]
Common Stock, Dividends, Per Share, Declared | $ / shares		$ 0.86		$ 0.83		$ 2.55		$ 2.46
Switzerland, Francs
Equity, Class of Treasury Stock [Line Items]
Common Stock, Dividends, Per Share, Declared | SFr / shares	SFr 0.75		SFr 0.78		SFr 2.29		SFr 2.32