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EQUITY INVESTMENTS - Schedule and Narrative (Details)
CAD in Millions, $ in Millions
12 Months Ended
Dec. 03, 2015
CAD
Dec. 31, 2015
CAD
Dec. 31, 2014
CAD
Dec. 31, 2013
CAD
Dec. 31, 2015
USD ($)
Dec. 30, 2015
Dec. 04, 2015
Dec. 02, 2015
Dec. 31, 2014
USD ($)
May. 31, 2013
Apr. 30, 2013
Equity Investments                      
Income / (Loss) from Equity Investments   CAD 440 CAD 522 CAD 597              
Equity Investments   6,214 5,598                
Distributions received from equity investments   802 738 733              
Returns of capital   226 159 128              
Undistributed earnings   198 551 754              
Contributions made to equity investments   CAD 493 CAD 256 CAD 163              
TC PipeLines, LP                      
Equity Investments                      
Ownership interest in subsidiary   28.00% 28.30% 28.90% 28.00%       28.30% 28.90% 33.30%
Northern Border                      
Equity Investments                      
Difference between the carrying value of the investment and the underlying equity in the net assets | $         $ 117       $ 117    
Bruce Power                      
Equity Investments                      
Ownership interest   48.50%     48.50%   48.50%        
Difference between the carrying value of the investment and the underlying equity in the net assets   CAD 973 CAD 776                
Bruce A                      
Equity Investments                      
Ownership interest           48.90%   48.90%      
Bruce B                      
Equity Investments                      
Ownership interest 46.50%         31.60%   31.60%      
Contributions made to equity investments CAD 236                    
Natural Gas Pipelines | Northern Border                      
Equity Investments                      
Ownership interest   14.00% 14.20% 14.50% 14.00%       14.20%    
Income / (Loss) from Equity Investments   CAD 85 CAD 76 CAD 66              
Equity Investments   CAD 664 587                
Natural Gas Pipelines | Northern Border | TC PipeLines, LP                      
Equity Investments                      
Ownership interest   50.00%     50.00%            
Natural Gas Pipelines | Iroquois                      
Equity Investments                      
Ownership interest   44.50%     44.50%            
Income / (Loss) from Equity Investments   CAD 51 43 41              
Equity Investments   CAD 238 210                
Natural Gas Pipelines | TQM                      
Equity Investments                      
Ownership interest   50.00%     50.00%            
Income / (Loss) from Equity Investments   CAD 12 12 13              
Equity Investments   72 73                
Natural Gas Pipelines | Other                      
Equity Investments                      
Income / (Loss) from Equity Investments   31 32 25              
Equity Investments   CAD 73 68                
Liquids Pipelines | Grand Rapids                      
Equity Investments                      
Ownership interest   50.00%     50.00%            
Equity Investments   CAD 542 240                
Liquids Pipelines | Canaport Energy East Marine Terminal                      
Equity Investments                      
Ownership interest   50.00%     50.00%            
Equity Investments   CAD 16                  
Energy | Other                      
Equity Investments                      
Income / (Loss) from Equity Investments   5 1 1              
Equity Investments   CAD 67 61                
Energy | Bruce Power                      
Equity Investments                      
Ownership interest   48.50%     48.50%            
Income / (Loss) from Equity Investments   CAD 249 314 310              
Equity Investments   CAD 4,200 3,995                
Energy | ASTC Power Partnership                      
Equity Investments                      
Ownership interest   50.00%     50.00%            
Income / (Loss) from Equity Investments   CAD (23) 8 110              
Equity Investments   CAD 21 29                
Energy | Portlands Energy                      
Equity Investments                      
Ownership interest   50.00%     50.00%            
Income / (Loss) from Equity Investments   CAD 30 36 CAD 31              
Equity Investments   CAD 321 CAD 335