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FINANCIAL RISK MANAGEMENT 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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Impact of 10 bp decrease on Net income (loss) | $ 0 | $ 1 | $ 2
Impact of 10 bp increase on Net income (loss) | 0 | (1) | (2)
Impact of 10 bp decrease on Other comprehensive (loss) income | (1) | (1) | (2)
Impact of 10 bp increase on Other comprehensive (loss) income | $ 1 | $ 1 | $ 2

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