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COMMITMENTS AND CONTINGENCIES - CONTINGENCIES (Details)
CAD in Millions, $ in Millions
 1 Months Ended 12 Months Ended 77 Months Ended
Sep. 09, 2010
USD ($)
bbl
Jul. 26, 2010
bbl
Jul. 26, 2010
mi
Jul. 26, 2010
km
Jun. 30, 2015
USD ($)
a
May 31, 2015
USD ($)
a
Mar. 31, 2013
USD ($)
item
Dec. 31, 2016
USD ($)
item
Dec. 31, 2016
USD ($)
item
Dec. 31, 2016
CAD
Dec. 31, 2016
CAD
item
Dec. 31, 2015
CAD
Dec. 31, 2014
item
Apr. 30, 2011
USD ($)
Sep. 09, 2010
CAD
CONTINGENCIES                              
Aggregate limited amount for pollution liability under insurance program               $ 900 $ 900         $ 650  
Environmental liabilities | CAD                     CAD 142 CAD 141      
Enbridge Energy Partners, L.P.                              
CONTINGENCIES                              
Economic interest ownership percentage               35.30% 35.30%   35.30% 35.70% 33.70%    
Line 6B Crude Oil Release                              
CONTINGENCIES                              
Estimated cost, net of tax | CAD                     CAD 195        
Amount of insurance claim recognized, net of tax | CAD                   CAD 80          
Line 6B Crude Oil Release | Enbridge Energy Partners, L.P.                              
CONTINGENCIES                              
Estimated volume of oil released (in barrels) | bbl   20,000                          
Area affected by released crude oil     38 61                      
Minimum acres of wetland provided through restoration | a           300                  
Payment for mitigation of impacts on banks, bottomlands and watershed           $ 5                  
Estimated cost               $ 1,200 $ 1,200            
Amount of insurance claim recognized                 547            
Expected insurance recovery               $ 650 650            
Insurance claim filed amount             $ 145                
Number of insurer disputing claim | item             1 1              
Proceeds from insurance recoveries to date               $ 42 $ 42            
Number of actions or claims filed | item               2 2   2        
Estimated fine or penalty amount               $ 69 $ 69            
Civil penalty               61              
Civil penalties agreed to be paid               61 61            
Line 6A Crude Oil Release                              
CONTINGENCIES                              
Estimated cost, net of tax | CAD                             CAD 7
Number of actions or claims filed | item                         1    
Line 6A Crude Oil Release | Enbridge Energy Partners, L.P.                              
CONTINGENCIES                              
Estimated volume of oil released (in barrels) | bbl 9,000                            
Estimated volume of oil removed from the pipeline as part of the repair (in barrels) | bbl 1,400                            
Estimated cost $ 53                            
Estimated liability | CAD                     CAD 0        
Civil penalties agreed to be paid               1 1            
Separate Agreement Related to Line 6A and 6B Crude Oil Release                              
CONTINGENCIES                              
Negotiated amount paid         $ 4                    
Amount of restoration land negotiated | a         175                    
Lakehead System Line 6A and 6B Crude Oil Release | Enbridge Energy Partners, L.P.                              
CONTINGENCIES                              
Civil penalties agreed to be paid               62 62            
Estimated cost of injunctive measures under Consent Decree               $ 110 $ 110