RELATED PARTY TRANSACTIONS RELATED PARTY TRANSACTIONS - Related Party Balances included within Consolidated Financial Statements (Details) - Other related parties [member] - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Disclosure of transactions between related parties [line items]
Investment and other losses	$ 0	$ (268)
Management fees received	$ 56	$ 47

The amount of revenue arising from the rendering of services in related party transactions. [Refer: Revenue; Related parties [member]]

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 24
-IssueDate 2017-01-01
-Paragraph 21
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2017-03-01&anchor=para_21_c&doctype=Standard
-URIDate 2017-03-09

Name:	ifrs-full_RevenueFromRenderingOfServicesRelatedPartyTransactions
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration