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CHANGE IN OPERATING WORKING CAPITAL - Components (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
CHANGE IN OPERATING WORKING CAPITAL    
Change in accounts receivable and other   $ 7
Change in other current assets $ (3) 1
Change in accounts payable and accrued liabilities   (3)
Change in accounts payable to affiliates   (1)
Change in accrued interest 9 3
Change in operating working capital $ 6 $ 7 [1]
[1] Recast to consolidate PNGTS (Refer to Note 2).