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Equity - Treasury Stock - Tabular Disclosure - Shares (Details) - Class B, Preference shares - shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Reconciliation of number of shares outstanding |  |
Number of shares outstanding at beginning of the year | (257,606,659) | (257,127,304)
Number of shares outstanding at end of the year | (258,010,058) | (257,606,659)
Treasury stock |  |
Reconciliation of number of shares outstanding |  |
Number of shares outstanding at beginning of the year | 3,818,451 | 4,297,806
Disposal of shares | (403,399) | (479,355)
Number of shares outstanding at end of the year | 3,415,052 | 3,818,451

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- Definition The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 79 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_79_a_iv&doctype=Standard -URIDate 2019-03-27 + Details
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