FINANCIAL INSTRUMENTS - Level 3 Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Financial assets
Balance, beginning of year	$ 6,957
Changes in fair value measurement, assets [abstract]
Balance, end of year	4,135	$ 6,957
Financial liabilities
Balance, beginning of year	72,738
Changes in fair value measurement, liabilities [abstract]
Balance, end of year	62,794	72,738
Level 3
Financial assets
Balance, beginning of year	767	835
Changes in fair value measurement, assets [abstract]
Additions		201
Dispositions/ Warrant exercise		(7)
Fair value gains, net and OCI		(14)
Other		(248)
Balance, end of year		767
Financial liabilities
Balance, beginning of year	838	836
Changes in fair value measurement, liabilities [abstract]
Additions		0
Dispositions/ Warrant exercise		(2)
Fair value gains, net and OCI		4
Other		0
Balance, end of year		838
Level 3 \| IFRS 9
Financial assets
Balance, beginning of year	767
Changes in fair value measurement, assets [abstract]
Additions	950
Dispositions/ Warrant exercise	(125)
Fair value gains, net and OCI	206
Other	(427)
Balance, end of year	1,371	767
Financial liabilities
Balance, beginning of year	838
Changes in fair value measurement, liabilities [abstract]
Additions	0
Dispositions/ Warrant exercise	0
Fair value gains, net and OCI	8
Other	76
Balance, end of year	$ 922	$ 838

Gains (Losses) Recognised In Profit Or Loss And Other Comprehensive Income, Fair Value Measurement, Assets

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Gains (Losses) Recognised In Profit Or Loss And Other Comprehensive Income, Fair Value Measurement, Liabilities

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Other Changes, Fair Value Measurement, Assets

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Other Changes, Fair Value Measurement, Liabilities

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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 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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The increase in the fair value measurement of assets resulting from purchases of those assets. [Refer: At fair value [member]]

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The increase in the fair value measurement of liabilities resulting from purchases of those liabilities. [Refer: At fair value [member]]

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The decrease in the fair value measurement of assets resulting from sales. [Refer: At fair value [member]]

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The decrease in the fair value measurement of liabilities resulting from sales. [Refer: At fair value [member]]

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