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GTN ACQUISITION (Details) - USD ($)
3 Months Ended 6 Months Ended
Apr. 01, 2015
Jun. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2014
Acquisition          
Total cash consideration     $ 264,000,000    
GTN | Former parent, TransCanada subsidiaries | Transaction between entities under common control          
Acquisition          
Interest acquired (as a percent) 30.00% 30.00% 30.00%   30.00%
Purchase price adjustments $ 11,000,000        
Purchase price 457,000,000        
Total cash consideration 264,000,000        
Assumption of proportional debt 98,000,000        
GTN | Former parent, TransCanada subsidiaries | Transaction between entities under common control | Previously reported          
Acquisition          
Purchase price 446,000,000        
Partnership interest | Class B units | GTN | Former parent, TransCanada subsidiaries | Transaction between entities under common control          
Acquisition          
Equity issuance $ 95,000,000        
GTN | Class B units | TransCanada | Distributions          
Distributions          
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 30 percent of GTN's annual distributions for payment to Class B units at specified percentage   $ 20,000,000      
Percentage applied to 30 percent of GTN's distributions above threshold after March 31, 2020   25.00%      
Effective percentage applied to GTN's distributions above threshold (as a percent)   30.00%      
Prorated threshold of GTN's distributions for payment to Class B units   $ 15,000,000      
TransCanada | GTN          
Noncontrolling interest          
Remaining noncontrolling ownership interest (as a percent)       30.00%