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CHANGE IN OPERATING WORKING CAPITAL - Components (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Increase (Decrease) in Operating Capital [Abstract]      
Change in accounts receivable and other $ 1 $ 9 $ (6)
Change in inventory (1) (2) 0
Change in other current assets 0 0 (1)
Change in accounts payable and accrued liabilities 5 (11) 3
Change in accounts payable to affiliates (1) 2 1
Change in accrued interest 0 (1) 0
Change in operating working capital $ 4 $ (3) $ (3)