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ACQUISITIONS - 2014 Bison Acquisition (Details) - USD ($)
$ in Millions
12 Months Ended
Oct. 01, 2014
Dec. 31, 2014
Dec. 31, 2016
Apr. 01, 2015
Sep. 30, 2014
Bison          
Acquisitions          
Reduction in Partners' Equity [1]   $ 217      
Bison | Limited Partners | Common units          
Acquisitions          
Reduction in Partners' Equity   $ 29      
Bison | Former parent, TransCanada subsidiaries | Transaction between entities under common control          
Acquisitions          
Interest acquired (as a percent) 30.00%   30.00% 30.00%  
Purchase price adjustments $ 2        
Total cash consideration 217        
TransCanada's carrying value of non-controlling interest 188        
Excess purchase price 29        
Bison | Former parent, TransCanada subsidiaries | Transaction between entities under common control | As previously recast          
Acquisitions          
Purchase price 215        
Bison | Former parent, TransCanada subsidiaries | Limited Partners | Transaction between entities under common control | Common units          
Acquisitions          
Reduction in Partners' Equity $ 29        
Bison | TransCanada          
Acquisitions          
Remaining noncontrolling ownership interest (as a percent)         30.00%
[1] Recast to consolidate PNGTS for all periods presented (Refer to Note 2).