CHANGE IN OPERATING WORKING CAPITAL - Components (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
CHANGE IN OPERATING WORKING CAPITAL
Change in accounts receivable and other	$ (3)	$ (1)	$ 1
Change in other current assets	(3)	1	1
Change in accounts payable and accrued liabilities	5	(3)	4
Change in accounts payable to affiliates	2	(10)	11
Change in accrued interest	1	4
Change in operating working capital	$ 2	$ (9)	$ 17