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FINANCIAL CHARGES AND OTHER (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
FINANCIAL CHARGES AND OTHER        
Interest Expense $ 23 $ 23 $ 71 $ 59
PNGTS' amortization of loss on derivative instruments (Note 13)     2 1
Net realized (gain) loss related to the interest rate swaps     (2)  
Other income     (2) (1)
Financial charges and other $ 23 $ 23 $ 69 $ 59