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FINANCIAL CHARGES AND OTHER (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
FINANCIAL CHARGES AND OTHER    
Interest expense $ 24 $ 17
Net realized gain related to the interest rate swaps (1)  
Financial charges and other $ 23 $ 17 [1]
[1] Recast to consolidate PNGTS (Refer to Note 2).