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CHANGE IN OPERATING WORKING CAPITAL - Components (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
CHANGE IN OPERATING WORKING CAPITAL    
Change in accounts receivable and other $ 11 $ 2
Change in other current assets 2 2
Change in accounts payable and accrued liabilities (5) 1
Change in accounts payable to affiliates (2) (2)
Change in state income taxes payable   8
Change in accrued interest 1 1
Change in operating working capital $ 7 $ 12 [1]
[1] Recast to consolidate PNGTS for all periods presented (Refer to Notes 2 and 6).