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CHANGE IN OPERATING WORKING CAPITAL (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Supplemental Cash Flow Elements [Abstract]    
Change in accounts receivable and other $ 6 $ 15
Change in inventories 0 (1)
Change in other current assets 3 3
Change in accounts payable and accrued liabilities 0 (12)
Change in accounts payable to affiliates (2) 0
Change in accrued interest (1) (1)
Change in operating working capital $ 6 $ 4