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CHANGE IN OPERATING WORKING CAPITAL - Components (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
CHANGE IN OPERATING WORKING CAPITAL    
Change in accounts receivable and other $ 16 $ 3
Change in inventories (1)  
Change in other current assets 4 1
Change in accounts payable and accrued liabilities (11) 13
Change in accrued interest 8 8
Change in operating working capital $ 16 $ 25