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Shareholders' equity Dividends Declared (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2019
$ / shares
Jun. 30, 2019
SFr / shares
Jun. 30, 2018
$ / shares
Jun. 30, 2018
SFr / shares
Jun. 30, 2019
$ / shares
Jun. 30, 2019
SFr / shares
Jun. 30, 2018
$ / shares
Jun. 30, 2018
SFr / shares
May 16, 2019
$ / shares
May 31, 2018
$ / shares
May 31, 2017
$ / shares
Equity, Class of Treasury Stock [Line Items]                      
Annual dividend per share approved by shareholders                 $ 3.00 $ 2.92 $ 2.84
Common Stock, Dividend Rate Approved                 $ 0.75 $ 0.73 $ 0.71
United States of America, Dollars                      
Equity, Class of Treasury Stock [Line Items]                      
Common Stock, Dividends, Per Share, Declared $ 0.75   $ 0.73   $ 1.48   $ 1.44        
Switzerland, Francs                      
Equity, Class of Treasury Stock [Line Items]                      
Common Stock, Dividends, Per Share, Declared | SFr / shares   SFr 0.75   SFr 0.73   SFr 1.47   SFr 1.39