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PARTNERS' EQUITY (Details 2) - Class B units - USD ($)
3 Months Ended
Apr. 01, 2015
Jun. 30, 2015
Former parent, TransCanada subsidiaries | Transaction between entities under common control | Partnership interest | GTN    
Partners' Equity    
Units issued (in units) 1,900,000  
Value per unit (in dollars per unit) $ 50  
Value of units issued $ 95,000,000  
GTN | TransCanada | Distributions    
Partners' Equity    
Portion of GTN's annual distributions to which the Class B units are entitled to receive a percentage share of the distributions above threshold (as a percent)   30.00%
Percentage applied to 30 percent of GTN's distributions above threshold through March 31, 2020   100.00%
Threshold of GTN's annual distributions for payment to Class B units   $ 20,000,000
Percentage applied to GTN's distributions above threshold after March 31, 2020   25.00%
Initial effective percentage applied to GTN's distributions above threshold   30.00%
Prorated threshold of GTN's distributions for payment to Class B units   $ 15,000,000