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NONCONTROLLING INTERESTS - UNITED STATES SPONSORED VEHICLE STRATEGY (Details)
$ / shares in Units, CAD in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 28, 2017
USD ($)
Apr. 27, 2017
USD ($)
shares
Jun. 30, 2016
CAD
Jun. 30, 2017
CAD
Jun. 30, 2016
CAD
Jun. 30, 2017
$ / shares
Feb. 15, 2017
Dec. 31, 2016
$ / shares
NONCONTROLLING INTERESTS                
Cash consideration | CAD     CAD 485   CAD 539      
Bakken Pipeline System                
NONCONTROLLING INTERESTS                
Portion of combined effective interest owned through joint funding arrangement (as a percent)           75.00%    
Effective interest (as a percent)           27.60%    
Enbridge Energy Partners, L.P.                
NONCONTROLLING INTERESTS                
Quarterly distribution (in USD per unit) | $ / shares           $ 0.35   $ 0.583
Enbridge Energy Partners, L.P. | Bakken Pipeline System                
NONCONTROLLING INTERESTS                
Portion of combined effective interest owned through joint funding arrangement (as a percent)           25.00%    
Effective interest (as a percent)             27.60%  
Period of option to acquire additional interest       5 years        
Additional portion of combined effective interest that may be acquired under option (as a percent)           20.00%    
Enbridge Energy Partners, L.P. | Class F units                
NONCONTROLLING INTERESTS                
Right to distributions in excess of US$0.295 per EEP unit (as a percent)           13.00%    
First threshold distribution level per EEP unit (in USD per unit) | $ / shares           $ 0.295    
Second threshold distribution level per EEP unit (in USD per unit) | $ / shares           $ 0.35    
Right to distributions in excess of US$0.35 per EEP unit (as a percent)           23.00%    
Enbridge Energy Partners, L.P. | Enbridge Inc.                
NONCONTROLLING INTERESTS                
Outstanding credit agreement balance repaid   $ 1,500            
Enbridge Energy Partners, L.P. | Enbridge Inc. | Class A common units                
NONCONTROLLING INTERESTS                
Common units issued (in units) | shares   64,300,000            
Enbridge Energy Partners, L.P. | Enbridge Inc. | Class D units                
NONCONTROLLING INTERESTS                
Units for which Enbridge waived all rights (in units) | shares   66,100,000            
Enbridge Energy Partners, L.P. | Enbridge Inc. | Incentive Distribution Units                
NONCONTROLLING INTERESTS                
Units for which Enbridge waived all rights (in units) | shares   1,000            
Enbridge Energy Partners, L.P. | Enbridge Inc. | Class F units                
NONCONTROLLING INTERESTS                
Common units issued (in units) | shares   1,000            
Enbridge Energy Partners, L.P. | Enbridge Inc. | Series 1 Preferred Units                
NONCONTROLLING INTERESTS                
Face value of units redeemed   $ 1,200            
Enbridge Energy Partners, L.P. | United States Sponsored Vehicle Strategy                
NONCONTROLLING INTERESTS                
Increase in noncontrolling interest | CAD       CAD 496        
Decrease to additional paid-in capital | CAD       442        
Decrease to deferred income taxes | CAD       CAD 267        
Midcoast Energy Partners, L.P.                
NONCONTROLLING INTERESTS                
Total ownership interest (as a percent) 100.00%              
Midcoast Energy Partners, L.P. | Public common unitholders                
NONCONTROLLING INTERESTS                
Total consideration   $ 170            
Midcoast Energy Partners, L.P. | Enbridge Energy Partners, L.P.                
NONCONTROLLING INTERESTS                
Cash consideration $ 1,300              
Existing indebtedness assumed $ 953