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GTN ACQUISITION (Details 2) - USD ($)
$ in Millions
9 Months Ended
Apr. 01, 2015
Sep. 30, 2015
Net purchase price allocation    
Reduction in Partners' Equity   $ 359
GTN | Former parent, TransCanada subsidiaries | Transaction between entities under common control    
Net purchase price allocation    
Net Purchase Price $ 359  
Less: TransCanada's carrying value of non-controlling interest as April 1, 2015 232  
Excess purchase price 127  
Purchase price 457  
Assumption of proportional debt 98  
GTN | Former parent, TransCanada subsidiaries | Transaction between entities under common control | Limited Partner and General Partner interests combined    
Net purchase price allocation    
Reduction in Partners' Equity $ 127