IMPAIRMENT REVERSALS (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Disclosure of impairment loss and reversal of impairment loss [line items]
Impairment (reversals) charges	$ (212)	$ (250)
Impairment (reversals) of long lived assets
Disclosure of impairment loss and reversal of impairment loss [line items]
Impairment (reversals) charges	(224)	(250)
Impairment of intangibles
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
-Note Effective 2018-01-01
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 82
-Subparagraph ba
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_82_ba&doctype=Standard
-URIDate 2017-03-09

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