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FINANCIAL CHARGES AND OTHER (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
FINANCIAL CHARGES AND OTHER        
Interest Expense $ 24 $ 19 $ 48 $ 36
PNGTS' amortization of loss on derivative instruments (Note 13) 2 1 2 1
Net realized gain related to the interest rate swaps (1)   (2)  
Other income (2) (1) (2) (1)
Financial charges and other $ 23 $ 19 $ 46 $ 36