INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Change in Investments (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Reconciliation of changes in associates and joint ventures
Balance at beginning of year			$ 5,572	$ 4,727	$ 4,727
Share of earnings for the year	$ 1	$ 36	(4)	$ 59	118
Foreign currency translation and other			(325)		167
Share of other comprehensive income from associates and joint ventures, other than foreign exchange differences			63		183
Distributions			(20)		(66)
Disposition of interest			(951)		(177)
Acquisitions			72		620
Balance at end of year	$ 4,407		$ 4,407		$ 5,572

Acquisitions Of Joint Ventures And Associates

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- Definition

Decrease (Increase) in Investment in Associates and Joint Ventures From Disposition Of Interests

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No definition available.

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- Definition

Decrease Through Distributions, Joint Ventures And Associates

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No definition available.

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- Definition

Increase (Decrease) Through Net Exchange Differences, Joint Ventures And Associates

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No definition available.

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- Definition

Reconciliation Of Changes In Associates And Joint Ventures [Abstract]

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- Definition

Share of other comprehensive income from associates and joint ventures, other than foreign exchange differences

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No definition available.

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- Definition

The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-IssueDate 2017-01-01
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-Subparagraph a
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The entity's share of the profit (loss) of associates and joint ventures accounted for using the equity method. [Refer: Associates [member]; Investments accounted for using equity method; Joint ventures [member]; Profit (loss)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective on first application of IFRS 9
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