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CHANGE IN OPERATING WORKING CAPITAL - Components (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
CHANGE IN OPERATING WORKING CAPITAL    
Change in accounts receivable and other $ 15 $ 2
Change in inventories (1)  
Change in other current assets 3 (1)
Change in accounts payable and accrued liabilities (12) (6)
Change in accrued interest (1)  
Change in operating working capital $ 4 $ (5)