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FINANCIAL RISK MANAGEMENT - Sensitivity Analysis for Interest Rate Risk (Details) - Interest rate risk - USD ($) $ in Millions | 12 Months Ended
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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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