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FINANCIAL RISK MANAGEMENT - Maximum Exposure Credit Risk (Details) - Credit risk - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	$ 3,677	$ 1,821
Cash and equivalents
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	3,314	1,571
Accounts receivable
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	363	248
Derivatives
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	$ 0	$ 2

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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- Definition

The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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