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FINANCIAL STATEMENT EFFECTS OF RATE REGULATION - GENERAL INFORMATION (Details)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Canadian Mainline    
GENERAL INFORMATION ON RATE REGULATION AND ITS EFFECTS    
Term of CLT 10 years  
Southern Lights    
GENERAL INFORMATION ON RATE REGULATION AND ITS EFFECTS    
After-tax ROE (as a percent) 10.00%  
Percentage of debt 70.00%  
Percentage of equity 30.00%  
Enbridge Gas Distribution    
GENERAL INFORMATION ON RATE REGULATION AND ITS EFFECTS    
After-tax ROE (as a percent) 9.30% 9.40%
Percentage of equity 36.00% 36.00%