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CHANGE IN OPERATING WORKING CAPITAL - Components (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
CHANGE IN OPERATING WORKING CAPITAL      
Change in accounts receivable and other $ 9 $ (6) $ 4
Change in inventory (2)    
Change in other current assets   (1) 2
Change in accounts payable and accrued liabilities (11) 3 (7)
Change in accounts payable to affiliates 2 1 (3)
Change in accrued interest (1)   2
Change in operating working capital $ (3) $ (3) $ (2)