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PARTNERS' EQUITY - Reclassification of units (Details) - USD ($)
shares in Millions, $ in Millions
2 Months Ended
May 19, 2016
Dec. 31, 2016
PARTNERS' EQUITY    
Common units subject to rescission [1]   $ 83
ATM Equity Issuance Program | Common Units    
PARTNERS' EQUITY    
Reclassification of common unit issuance subject to rescission, net (in units) 1.6  
Common units subject to rescission   $ 83
[1] Recast to consolidate PNGTS for all periods presented (Refer to Notes 2 and 6).