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EQUITY INVESTMENTS - Schedule and Narrative (Details)
CAD in Millions, $ in Millions
1 Months Ended 12 Months Ended
May 01, 2016
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2016
CAD
Dec. 31, 2015
CAD
Dec. 31, 2016
CAD
Dec. 31, 2015
CAD
Dec. 31, 2014
CAD
Dec. 31, 2016
USD ($)
Dec. 31, 2016
CAD
Dec. 31, 2015
USD ($)
Dec. 31, 2015
CAD
Nov. 30, 2015
Equity Investments                        
Income/(Loss) from Equity Investments         CAD 514 CAD 440 CAD 522          
Equity Investments                 CAD 6,544   CAD 6,214  
Distributions received from equity investments         1,571 802 738          
Returns of capital         727 9 12          
Undistributed earnings           198 551          
Contributions made to equity investments         765 493 256          
Northern Border                        
Equity Investments                        
Difference between the carrying value of the investment and the underlying equity in the net assets | $               $ 116   $ 117    
Iroquois                        
Equity Investments                        
Ownership interest (percent) 50.00% 49.35% 49.35%                  
Additional ownership acquired (percent) 0.65% 4.87% 4.87%                  
Contributions made to equity investments | $ $ 7 $ 54                    
Bruce Power                        
Equity Investments                        
Ownership interest (percent)               48.50% 48.50% 48.50% 48.50%  
Difference between the carrying value of the investment and the underlying equity in the net assets                 CAD 942   CAD 973  
Bruce A                        
Equity Investments                        
Ownership interest (percent)                   48.90% 48.90% 48.90%
Bruce B                        
Equity Investments                        
Ownership interest (percent)                   46.50% 46.50% 31.60%
Additional ownership acquired (percent)                   14.89% 14.89%  
Contributions made to equity investments       CAD 236                
Canadian Natural Gas Pipelines | TQM                        
Equity Investments                        
Ownership interest (percent)               50.00% 50.00%      
Income/(Loss) from Equity Investments         12 12 12          
Equity Investments                 CAD 71   CAD 72  
U.S. Natural Gas Pipelines | Northern Border                        
Equity Investments                        
Ownership interest (percent)               50.00% 50.00%      
Income/(Loss) from Equity Investments         92 85 76          
Equity Investments                 CAD 597   CAD 664  
U.S. Natural Gas Pipelines | Iroquois                        
Equity Investments                        
Ownership interest (percent)               50.00% 50.00% 44.50% 44.50%  
Income/(Loss) from Equity Investments         54 51 43          
Equity Investments                 CAD 309   CAD 238  
Additional ownership acquired (percent) 0.65% 4.87% 4.87%                  
U.S. Natural Gas Pipelines | Millennium                        
Equity Investments                        
Ownership interest (percent)               47.50% 47.50%      
Income/(Loss) from Equity Investments         33              
Equity Investments                 CAD 295      
U.S. Natural Gas Pipelines | Pennant Midstream                        
Equity Investments                        
Ownership interest (percent)               47.00% 47.00%      
Income/(Loss) from Equity Investments         6              
Equity Investments                 CAD 246      
U.S. Natural Gas Pipelines | Other                        
Equity Investments                        
Income/(Loss) from Equity Investments         29 26 24          
Equity Investments                 93   31  
Mexico Natural Gas Pipelines | Other                        
Equity Investments                        
Income/(Loss) from Equity Investments           5 8          
Equity Investments                 CAD 28   42  
Mexico Natural Gas Pipelines | Sur de Texas                        
Equity Investments                        
Ownership interest (percent)               60.00% 60.00%      
Income/(Loss) from Equity Investments         (3)              
Equity Investments                 CAD 255      
Liquids Pipelines | Other                        
Equity Investments                        
Income/(Loss) from Equity Investments         0 0 0          
Equity Investments                 CAD 39   16  
Liquids Pipelines | Grand Rapids                        
Equity Investments                        
Ownership interest (percent)               50.00% 50.00%      
Income/(Loss) from Equity Investments         (1) 0 0          
Equity Investments                 CAD 876   542  
Energy | Other                        
Equity Investments                        
Income/(Loss) from Equity Investments         3 5 1          
Equity Investments                 CAD 66   67  
Energy | Bruce Power                        
Equity Investments                        
Ownership interest (percent)               48.50% 48.50%      
Income/(Loss) from Equity Investments         293 249 314          
Equity Investments                 CAD 3,356   4,200  
Energy | Portlands Energy                        
Equity Investments                        
Ownership interest (percent)               50.00% 50.00%      
Income/(Loss) from Equity Investments         33 30 36          
Equity Investments                 CAD 313   321  
Energy | ASTC Power Partnership                        
Equity Investments                        
Ownership interest (percent)               50.00% 50.00%      
Income/(Loss) from Equity Investments         CAD (37) CAD (23) CAD 8          
Equity Investments                     CAD 21  
Energy | Sundance B PPA                        
Equity Investments                        
Asset impairment charges     CAD 29                  
Asset impairment charge, after tax     CAD 21