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ACQUISITIONS AND DISPOSITIONS (Details)
$ / shares in Units, CAD in Millions, $ in Millions
1 Months Ended 12 Months Ended 24 Months Ended
Dec. 03, 2015
CAD
Apr. 01, 2015
USD ($)
Nov. 26, 2014
CAD
Oct. 01, 2014
USD ($)
Apr. 15, 2014
CAD
Jul. 31, 2013
USD ($)
May. 31, 2013
CAD
shares
May. 31, 2013
USD ($)
$ / shares
shares
Dec. 31, 2015
CAD
Dec. 31, 2014
CAD
facility
Dec. 31, 2013
CAD
facility
Dec. 31, 2014
facility
Dec. 30, 2015
Dec. 04, 2015
Dec. 02, 2015
Apr. 30, 2013
ACQUISITIONS AND DISPOSITIONS                                
Proceeds from sale of assets, net of transaction costs (Note 25)                   CAD 196            
Gain (loss) on disposal                 CAD (125) 117            
Contributions made to equity investments                 493 256 CAD 163          
Purchase price                 236 CAD 241 CAD 216          
Gas Pacifico and INNERGY | Disposal group, not discontinued operations                                
ACQUISITIONS AND DISPOSITIONS                                
Ownership interest     30.00%                          
Proceeds from sale of assets, net of transaction costs (Note 25)     CAD 9                          
Gain (loss) on disposal     9                          
Proceeds from sale of assets, net of tax     CAD 8                          
Cancarb Limited | Disposal group, not discontinued operations                                
ACQUISITIONS AND DISPOSITIONS                                
Proceeds from sale of assets, net of transaction costs (Note 25)         CAD 190                      
Gain (loss) on disposition, gross         108                      
Gain (loss) on disposition, net of tax         CAD 99                      
Gas Transmission Northwest LLC | Natural Gas                                
ACQUISITIONS AND DISPOSITIONS                                
Ownership interest before transaction (as a percent)           45.00%                    
Ontario solar projects | Energy                                
ACQUISITIONS AND DISPOSITIONS                                
Number of facilities acquired | facility                   4 4 8        
Purchase price                 CAD 457 CAD 241 CAD 216          
Term of contract to sell solar power                 20 years              
TC PipeLines, LP                                
ACQUISITIONS AND DISPOSITIONS                                
Number of common units sold in an underwritten public offering (in shares) | shares             8,855,000 8,855,000                
Price per common unit issued (in dollars per unit) | $ / shares               $ 43.85                
Gross proceeds from public offering | $               $ 388                
Net proceeds from issuance of common units | $               373                
Capital contribution made to maintain general partnership interest | $               $ 8                
General partnership interest             2.00% 2.00%                
Ownership interest in subsidiary             28.90% 28.90% 28.00% 28.30% 28.90% 28.30%       33.30%
After-tax dilution gain recorded in additional paid-in capital             CAD 29                  
Pre-tax dilution gain recorded in additional paid-in capital as a result of decrease in ownership interest             CAD 47                  
Gas Transmission Northwest | Disposal group, disposed of by sale, not discontinued operations | Natural Gas                                
ACQUISITIONS AND DISPOSITIONS                                
Ownership interest before transaction (as a percent)   30.00%                            
Total consideration | $   $ 457                            
Cash received | $   264                            
Assumption of debt by purchaser | $   98                            
Gas Transmission Northwest | Disposal group, disposed of by sale, not discontinued operations | Natural Gas | Class B units                                
ACQUISITIONS AND DISPOSITIONS                                
Receipt of new units | $   $ 95                            
Bison LLC | Natural Gas                                
ACQUISITIONS AND DISPOSITIONS                                
Ownership interest before transaction (as a percent)       30.00%                        
Cash received | $       $ 215                        
GTN LLC and Bison LLC | Natural Gas                                
ACQUISITIONS AND DISPOSITIONS                                
Cash received | $           $ 1,050                    
Long-term debt included in aggregate purchase price | $           $ 146                    
Percentage of acquired long-term debt           45.00%                    
Bruce Power                                
ACQUISITIONS AND DISPOSITIONS                                
Ownership interest                 48.50%         48.50%    
Bruce Power | Energy                                
ACQUISITIONS AND DISPOSITIONS                                
Ownership interest                 48.50%              
Bruce A                                
ACQUISITIONS AND DISPOSITIONS                                
Ownership interest                         48.90%   48.90%  
Bruce B                                
ACQUISITIONS AND DISPOSITIONS                                
Ownership interest 46.50%                       31.60%   31.60%  
Additional ownership acquired 14.89%                              
Contributions made to equity investments CAD 236