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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, 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 (1) (2) (2)
Impact of 10 bp increase on Other comprehensive (loss) income $ 1 $ 2 $ 2