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CHANGE IN OPERATING WORKING CAPITAL - Components (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
CHANGE IN OPERATING WORKING CAPITAL    
Change in accounts receivable and other $ 3 $ 13
Change in other current assets 1 1
Change in accounts payable and other current liabilities 13 2
Change in accounts payable to affiliates   (3)
Change in accrued interest 8 11
Change in operating working capital $ 25 $ 24