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CHANGE IN OPERATING WORKING CAPITAL (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Supplemental Cash Flow Elements [Abstract]    
Change in accounts receivable and other $ 5 $ 16
Change in inventories 0 (1)
Change in other current assets 3 4
Change in accounts payable and accrued liabilities 3 (11)
Change in accounts payable to affiliates (2) 0
Change in accrued interest 8 8
Change in operating working capital $ 17 $ 16