FINANCIAL INSTRUMENTS - Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of maturity analysis for derivative financial liabilities [line items]
Total financial assets	$ 4,135	$ 6,957
Capital securities	3,075	3,385
Total financial liabilities	62,794	72,738
Level 3
Disclosure of maturity analysis for derivative financial liabilities [line items]
Total financial assets		767	$ 835
Total financial liabilities		838	$ 836
Fair value
Disclosure of maturity analysis for derivative financial liabilities [line items]
Participating Loan Interests, Fair Value Disclosure	0	268
Securities designated as FVTPL	1,250	239
Investments in equity instruments designated at fair value through other comprehensive income	121	260
Derivative assets	90	247
Total financial assets	1,461	1,014
Capital securities	922	813
Derivative financial liabilities	702	340
Loan payable	0	24
Total financial liabilities	1,624	1,177
Fair value \| Level 1
Disclosure of maturity analysis for derivative financial liabilities [line items]
Participating Loan Interests, Fair Value Disclosure	0	0
Securities designated as FVTPL	0	0
Investments in equity instruments designated at fair value through other comprehensive income	0	0
Derivative assets	0	0
Total financial assets	0	0
Capital securities	0	0
Derivative financial liabilities	0	0
Loan payable	0	0
Total financial liabilities	0	0
Fair value \| Level 2
Disclosure of maturity analysis for derivative financial liabilities [line items]
Participating Loan Interests, Fair Value Disclosure	0	0
Securities designated as FVTPL	0	0
Investments in equity instruments designated at fair value through other comprehensive income	0	0
Derivative assets	90	247
Total financial assets	90	247
Capital securities	0	0
Derivative financial liabilities	702	340
Loan payable	0	0
Total financial liabilities	702	340
Fair value \| Level 3
Disclosure of maturity analysis for derivative financial liabilities [line items]
Participating Loan Interests, Fair Value Disclosure	0	268
Securities designated as FVTPL	1,250	239
Investments in equity instruments designated at fair value through other comprehensive income	121	260
Derivative assets	0	0
Total financial assets	1,371	767
Capital securities	922	813
Derivative financial liabilities	0	0
Loan payable	0	24
Total financial liabilities	$ 922	$ 837

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Participating Loan Interests, Fair Value Disclosure

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The amount of instruments issued by the entity that represent indebtedness.

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The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

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The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

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The amount of investments in equity instruments that the entity has designated at fair value through other comprehensive income. [Refer: At fair value [member]; Other comprehensive income]

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The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

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The amount of financial assets at fair value through profit or loss classified as held for trading. A financial asset is classified as held for trading if: (a) it is acquired principally for the purpose of selling it in the near term; (b) on initial recognition it is part of a portfolio of identified financial instruments that are managed together and for which there is evidence of a recent actual pattern of short-term profit-taking; or (c) it is a derivative (except for a derivative that is a financial guarantee contract or a designated and effective hedging instrument). [Refer: At fair value [member]; Financial assets at fair value through profit or loss]

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The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]]

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