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FINANCIAL RISK MANAGEMENT - Sensitivity Analysis for Interest Rate Risk (Details) - Interest rate risk - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of nature and extent of risks arising from financial instruments [line items]
Impact of 10 bp decrease on net income (loss)	$ 1	$ 1	$ 1
Impact of 10 bp increase on net income (loss)	(1)	(1)	(1)
Impact of 10 bp decrease on other comprehensive (loss) income	0	0	0
Impact of 10 bp increase on other comprehensive (loss) income	$ 0	$ 0	$ 0

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Sensitivity Analysis, Impact Of 0.1 Percent Decrease In Rates On Other Comprehensive Income (Loss)

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Sensitivity Analysis, Impact Of 0.1 Percent Decrease In Rates On Profit Loss

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Sensitivity Analysis, Impact Of 0.1 Percent Increase In Rates On Other Comprehensive Income (Loss)

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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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