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NET INCOME PER COMMON UNIT- Terms of Class B Unit Distributions and Determination of Net Income (Loss) per Common Unit (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Net income (loss) per common unit          
Net income attributable to controlling interests $ 73 $ 55 $ 169 $ 132  
Net income attributable to PNGTS' former parent       (2)  
Net income attributable to General and Limited Partners 73 55 169 130  
Incentive distributions attributable to the General Partner   (3)   (5)  
Net income attributable to General Partner's two percent interest (1) (2) (3) (3)  
Net income attributable to common units 72 50 166 122  
Common Units          
Net income (loss) per common unit          
Net income attributable to the General Partner and common units 73 52 169 125  
Net income attributable to common units $ 72 $ 50 $ 166 $ 122  
Weighted average common units outstanding - basic (in units) 71.3 68.9 71.2 68.6  
Weighted average common units outstanding - diluted (in units) 71.3 68.9 71.2 68.6  
Net income (loss) per common unit - basic (in dollars per unit) $ 1.00 $ 0.73 $ 2.33 $ 1.78  
Net income (loss) per common unit - diluted (in dollars per unit) $ 1.00 $ 0.73 $ 2.33 $ 1.78  
GTN | Class B Units | TransCanada | Distributions          
Distributions          
Percentage applied to GTN's distributable cash flow     30.00%    
Net income attributable to controlling interests $ 0 $ 0 $ 0 $ 0  
Threshold of GTN's distributions for payment to Class B units     $ 20   $ 20