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ACQUISITIONS - 2014 Bison Acquisition (Details 3) - USD ($)
$ in Millions
12 Months Ended
Oct. 01, 2014
Jul. 01, 2013
Dec. 31, 2014
Sep. 30, 2014
Bison        
Acquisitions        
Total cash consideration     $ 217  
Reduction in Partners' Equity     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 by Partnership (as a percent) 30.00% 45.00%    
Purchase price   $ 300    
Purchase price adjustments $ 2      
Total cash consideration 217      
TransCanada's carrying value of non-controlling interest 188      
Excess purchase price 29 $ 12    
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%