Consolidated Statements of Changes In Equity (Parenthetical)	May 22, 2017 shares	Dec. 31, 2019 shares	Dec. 31, 2018 shares	Dec. 31, 2017 shares	May 21, 2017 shares
Statement of changes in equity [abstract]
Reverse stock split ratio	0.3333333333
Shares outstanding (in shares)	1,020,000,000	1,012,079,421	1,013,568,258	1,019,916,787	3,058,000,000

The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 79
-Subparagraph a
-Clause iv
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_79_a_iv&doctype=Standard
-URIDate 2018-03-16

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant