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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
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