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Shareholders' equity Dividends Declared (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2024
SFr / shares
Sep. 30, 2024
$ / shares
Sep. 30, 2023
SFr / shares
Sep. 30, 2023
$ / shares
Sep. 30, 2024
SFr / shares
Sep. 30, 2024
$ / shares
Sep. 30, 2023
SFr / shares
Sep. 30, 2023
$ / shares
Equity, Class of Treasury Stock [Line Items]                
Common Stock, Dividends, Per Share, Declared | (per share) SFr 0.78 $ 0.91 SFr 0.75 $ 0.86 SFr 2.35 $ 2.68 SFr 2.29 $ 2.55