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NONCONTROLLING INTERESTS - NONCONTROLLING INFORMATION (Details)
CAD / shares in Units, $ / shares in Units, CAD in Millions, $ in Millions
12 Months Ended
Jun. 28, 2017
USD ($)
Apr. 28, 2017
CAD
Apr. 27, 2017
USD ($)
shares
Mar. 13, 2015
CAD
Mar. 13, 2015
USD ($)
Jan. 02, 2015
CAD
Jan. 02, 2015
USD ($)
Jan. 01, 2015
Dec. 31, 2017
CAD
Dec. 31, 2016
CAD
Apr. 27, 2017
CAD / shares
Apr. 27, 2017
$ / shares
Feb. 15, 2017
Enbridge Energy Partners, L.P.                          
NONCONTROLLING INTERESTS                          
Increase (decrease) in noncontrolling interest           CAD (304)              
Increase to additional paid in capital           218              
Increase to deferred income taxes           CAD 86              
Common units, quarterly distribution per unit | (per share)                     CAD 0.583 $ 0.35  
Reduction in income (loss) attributable to noncontrolling interests and redeemable noncontrolling interests due to reallocation                 CAD 73 CAD 816      
GP interest percent in EEP       2.00% 2.00%                
Contributions from unitholders       CAD 366 $ 289                
Strategic Review Actions | Enbridge Energy Partners, L.P.                          
NONCONTROLLING INTERESTS                          
Increase (decrease) in noncontrolling interest   CAD 458                      
Increase to additional paid in capital   421                      
Increase to deferred income taxes   CAD 253                      
Enbridge Inc. | Enbridge Energy Partners, L.P.                          
NONCONTROLLING INTERESTS                          
Repayments of related party debt | $     $ 1,500                    
Midcoast Energy Partners, L.P.                          
NONCONTROLLING INTERESTS                          
Total ownership interest (as a percent) 100.00%                        
Midcoast Energy Partners, L.P. | Midcoast Public Unitholders [Member]                          
NONCONTROLLING INTERESTS                          
Purchase price | $     170                    
Midcoast Energy Partners, L.P. | Enbridge Energy Partners, L.P.                          
NONCONTROLLING INTERESTS                          
Payments to acquire businesses, gross | $ $ 1,300                        
Liabilities assumed | $ $ 953                        
Preferred Units Series1 | Enbridge Inc. | Enbridge Energy Partners, L.P.                          
NONCONTROLLING INTERESTS                          
Partners' capital account, redemptions | $     $ 1,200                    
Common Units Classa | Enbridge Inc. | Enbridge Energy Partners, L.P.                          
NONCONTROLLING INTERESTS                          
Partners' capital account, units, sold in private placement | shares     64,300,000                    
Common Units Class D | Enbridge Inc. | Enbridge Energy Partners, L.P.                          
NONCONTROLLING INTERESTS                          
Common units rights waived, number of units | shares     66,100,000                    
Incentive Distribution Units | Enbridge Inc. | Enbridge Energy Partners, L.P.                          
NONCONTROLLING INTERESTS                          
Common units rights waived, number of units | shares     1,000                    
Common Units Class F | Enbridge Energy Partners, L.P.                          
NONCONTROLLING INTERESTS                          
Common units distribution percentage above first threshold                     13.00% 13.00%  
Common units first distribution threshold | $ / shares                       $ 0.295  
Common units second distribution threshold | $ / shares                       $ 0.35  
Common units distribution percentage above second threshold                     23.00% 23.00%  
Common Units Class F | Enbridge Inc. | Enbridge Energy Partners, L.P.                          
NONCONTROLLING INTERESTS                          
Partners' capital account, units, sold in private placement | shares     1,000                    
Bakken Pipeline System                          
NONCONTROLLING INTERESTS                          
Joint funding arrangement, ownership percentage                     75.00% 75.00%  
Ownership interest (as a percent)                     27.60% 27.60%  
Bakken Pipeline System | Enbridge Energy Partners, L.P.                          
NONCONTROLLING INTERESTS                          
Joint funding arrangement, ownership percentage                     25.00% 25.00%  
Ownership interest (as a percent)                         27.60%
Joint funding arrangement, period of option to purchase additional interest     5 years                    
Joint funding arrangement, additional interest under option                     20.00% 20.00%  
Alberta Clipper Pipeline | Enbridge Energy Partners, L.P.                          
NONCONTROLLING INTERESTS                          
Ownership percentage before transfer               33.30%          
Alberta Clipper Pipeline | Enbridge Energy Partners, L.P.                          
NONCONTROLLING INTERESTS                          
Investment ownership percentage transferred           66.70% 66.70%            
Consideration received           CAD 1,100 $ 1,000            
Consideration received as debt repayment           359 306            
Preference Shares, Series E | Alberta Clipper Pipeline | Enbridge Energy Partners, L.P.                          
NONCONTROLLING INTERESTS                          
Equity received as consideration           CAD 814 $ 694