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Shareholders' equity (Details)
 3 Months Ended
Aug. 04, 2022
shares
Jan. 17, 2022
shares
Mar. 31, 2023
SFr / shares
shares
Dec. 31, 2022
SFr / shares
shares
May 20, 2021
$ / shares
May 20, 2020
$ / shares
Stockholders' Equity Note [Abstract]            
Common Shares, par value | SFr / shares     SFr 24.15 SFr 24.15    
Treasury Stock, Shares, Retired 13,179,100 14,465,400        
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures     1,574,224      
Common Stock, Dividend Rate Approved | $ / shares         $ 0.83 $ 0.80
Annual dividend per share approved by shareholders | $ / shares         3.32 3.20
Equity, Class of Treasury Stock [Line Items]            
Common Stock, Dividend Rate Approved | $ / shares         $ 0.83 $ 0.80
Treasury Stock, Shares, Retired 13,179,100 14,465,400        
Treasury Stock, Common, Shares     32,217,934 31,781,758