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Equity - Share Capital - Movement in Outstanding Shares (Details) - shares
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Class A, Ordinary shares    
Reconciliation of number of shares outstanding    
Number of shares outstanding at beginning of the year 426,129,798 426,129,798
Number of shares outstanding at end of the year 426,129,798 426,129,798
Class B, Preference shares    
Reconciliation of number of shares outstanding    
Number of shares outstanding at beginning of the year 257,606,659 257,127,304
(Acquisition) / disposal of treasury stock 403,399 479,355
Number of shares outstanding at end of the year 258,010,058 257,606,659