IMPAIRMENT REVERSALS (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Disclosure of impairment loss and reversal of impairment loss [line items]
Impairment (reversals) charges	$ (269)	$ (1,423)
Impairment (reversals) of long lived assets
Disclosure of impairment loss and reversal of impairment loss [line items]
Impairment (reversals) charges	(281)	(1,423)
Intangible assets other than goodwill [member]
Disclosure of impairment loss and reversal of impairment loss [line items]
Impairment (reversals) charges	$ 12	$ 0

The amount of impairment loss, impairment gain or reversal of impairment loss that is recognised in profit or loss in accordance with paragraph 5.5.8 of IFRS 9 and that arises from applying the impairment requirements in Section 5.5 of IFRS 9.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 82
-Subparagraph ba
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_82_ba&doctype=Standard
-URIDate 2019-03-27

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration