EARNINGS PER SHARE (Details) - Narrative - shares shares in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of earnings per share [Abstract]
Number of shares reserved for issue under options and contracts for sale of shares (in shares)	28	25	38
Antidilutive securities excluded from computation of earnings per share number of shares (in shares)	647	24	0

The number of shares reserved for issue under options and contracts for the sale of shares.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 79
-Subparagraph a
-Clause vii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_79_a_vii&doctype=Standard
-URIDate 2020-01-01

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