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FINANCIAL CHARGES AND OTHER (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
FINANCIAL CHARGES AND OTHER        
Interest Expense $ 19 $ 16 $ 36 $ 35
PNGTS' amortization of derivative loss on derivative instruments 1 1 1 1
Net realized loss related to the interest rate swaps   1   1
Other Income (1) (1) (1) (2)
Financial charges and other $ 19 $ 17 [1] $ 36 $ 35 [1]
[1] Recast to consolidate PNGTS for all periods presented (Refer to Notes 2 and 6).