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Common Shareholders' Equity (Details 1)
 12 Months Ended
Dec. 31, 2019
$ / shares
Dec. 31, 2018
$ / shares
Dec. 31, 2017
$ / shares
Dec. 31, 2016
$ / shares
Dec. 04, 2019
$ / shares
Apr. 17, 2019
$ / shares
Dec. 05, 2018
$ / shares
Apr. 11, 2018
$ / shares
Dec. 06, 2017
$ / shares
Interim dividend                  
Disclosure of Common Shareholders' Equity [Line Items]                  
Dividend paid date Dec. 26, 2019 Jan. 04, 2019 Jan. 05, 2018 Jan. 06, 2017          
Dividend per Share | (per share) $ 75.0000 $ 140.0000 $ 70.0000 $ 66.0000 $ 75   $ 140   $ 70
Year of dividend 2019 2018 2017 2016          
Final dividend                  
Disclosure of Common Shareholders' Equity [Line Items]                  
Dividend paid date   Apr. 29, 2019 Apr. 26, 2018 Apr. 26, 2017          
Dividend per Share | (per share)   $ 358.33030 $ 108.88833 $ 110.32236   $ 358.33030   $ 108.88833  
Year of dividend   2018 2017 2016