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ACQUISITIONS - Acquisition of Ownership Interest in PNGTS (Details) - Portland Natural Gas Transmission System - USD ($)
$ in Millions
3 Months Ended
Jan. 01, 2016
Mar. 31, 2016
Jan. 31, 2016
Acquisition      
Interest acquired (as a percent)     49.90%
Net purchase price [1]   $ 193  
TransCanada | Transaction between entities under common control      
Acquisition      
Total purchase price $ 228    
Net purchase price 193    
Less: TransCanada's carrying value of non-controlling interest 120    
Excess purchase price 73    
Purchase price adjustments 5    
Assumption of proportional debt 35    
Additional contingent payment, minimum 5    
Additional contingent payment, maximum $ 50    
Period following closing date during which additional payments may be required 15 years    
[1] Recast to consolidate PNGTS for all periods presented (Refer to Note 2).