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NONCONTROLLING INTERESTS - REDEEMABLE NONCONTROLLING INFORMATION (Details) - CAD
CAD / shares in Units, CAD in Millions
12 Months Ended
Apr. 18, 2017
Dec. 31, 2016
Enbridge Income Fund Holdings Inc    
REDEEMABLE NONCONTROLLING INTERESTS    
Economic interest (as a percent) 84.60% 86.90%
Secondary Offering    
REDEEMABLE NONCONTROLLING INTERESTS    
Decrease in noncontrolling interest CAD 87  
Increase in Additional paid-in capital CAD 87  
Enbridge Income Fund Holdings Inc | Secondary Offering    
REDEEMABLE NONCONTROLLING INTERESTS    
Ownership interest maintained by Enbridge (as a percent) 19.90%  
Common shares retained by Enbridge 4,309,867  
Enbridge Income Fund Holdings Inc | Secondary Offering | Public investors    
REDEEMABLE NONCONTROLLING INTERESTS    
Common shares sold to the public (in shares) 17,347,750  
Share price (in CAD per share) CAD 33.15  
Gross proceeds to Enbridge CAD 600  
Enbridge Income Fund Holdings Inc | Secondary Offering | Enbridge Inc.    
REDEEMABLE NONCONTROLLING INTERESTS    
Common shares issued to Enbridge in exchange for Fund units (in shares) 21,657,617