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INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Change in Investments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of changes in associates and joint ventures
Balance at beginning of year	$ 4,967	$ 4,591
Share of earnings for the year	131	224	$ (13)
Foreign currency translation and other	(245)	(62)
Share of other comprehensive income	7	54
Distributions	(167)	(254)
Disposition of interest	0	(135)
Held for sale	0	(38)
Change in basis of accounting	466	0
Acquisitions	369	587
Balance at end of year	$ 5,528	$ 4,967	$ 4,591

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

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

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Investments Reclassified as Held for Sale

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Reconciliation Of Changes In Associates And Joint Ventures [Abstract]

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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]]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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)]

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The entity's share of the total comprehensive income of associates and joint ventures accounted for using the equity method. [Refer: Associates [member]; Joint ventures [member]; Investments accounted for using equity method]

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