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CONTINGENCIES (Details)
CAD in Millions, $ in Millions
 1 Months Ended 84 Months Ended
Jun. 15, 2017
USD ($)
Mar. 31, 2015
USD ($)
item
Jun. 30, 2017
USD ($)
item
Jun. 30, 2017
CAD
Jun. 30, 2017
CAD
item
May 02, 2017
USD ($)
Lakehead System Line 6A and 6B Crude Oil Release            
CONTINGENCIES            
Total payments as required by Consent Decree $ 68          
Past removal costs and interest paid 6          
Line 6B Crude Oil Release            
CONTINGENCIES            
Estimated cost, net of tax | CAD         CAD 195  
Insurance recoveries, after tax | CAD       CAD 80    
Applicable limit of comprehensive insurance coverage     $ 650      
Remaining coverage limit     $ 103      
Remaining coverage limit subject to lawsuit   $ 85        
Number of insurers disputing claim | item   1        
Claim submitted to binding arbitration with unfavorable result           $ 85
Number of actions or claims filed | item     1   1  
Civil penalty paid 61          
Line 6B Crude Oil Release | Enbridge Energy Partners, L.P.            
CONTINGENCIES            
Estimated cost     $ 1,200      
Insurance recoveries     547      
Estimated fine or penalty amount     $ 69      
Line 6A Crude Oil Release            
CONTINGENCIES            
Civil penalty paid $ 1