XML 13 R39.htm IDEA: XBRL DOCUMENT v3.3.0.814
GTN ACQUISITION (Details) - USD ($)
6 Months Ended 9 Months Ended
Apr. 01, 2015
Sep. 30, 2015
Sep. 30, 2015
Mar. 31, 2015
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%      
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        
Units issued (in units) 1,900,000      
Value per unit (in dollars per unit) $ 50      
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%      
Percentage applied to GTN's distributable cash flow for the nine months ending December 31, 2015   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%