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Equity - Treasury Stock - Tabular Disclosure - Shares (Details) - Class B, Preference shares - shares	12 Months Ended
	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

Sale or issue of treasury shares, shares

+ References

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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
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-URIDate 2019-03-27

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