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FINANCIAL STATEMENT EFFECTS OF RATE REGULATION - REGULATORY ASSETS AND LIABILITIES (Details) - CAD
CAD in Millions
1 Months Ended 12 Months Ended
May. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
FINANCIAL STATEMENT EFFECTS        
Regulatory assets   CAD 0    
Enbridge Gas Distribution Inc. preferred shares        
FINANCIAL STATEMENT EFFECTS        
Cumulative costs relating to consulting contract capitalized   CAD 179 CAD 166  
Average service life   25 years    
Other Postretirement Plans | Enbridge Gas Distribution Inc. preferred shares        
FINANCIAL STATEMENT EFFECTS        
Amount of OPEB balance expected to be collected   CAD 75 84 CAD 89
Term for collection of OPEB balance commencing from 2013       20 years
Liquids Pipelines | Deferred income taxes        
FINANCIAL STATEMENT EFFECTS        
Regulatory assets     907  
Liquids Pipelines | Pipeline future abandonment costs        
FINANCIAL STATEMENT EFFECTS        
Regulatory Liabilities   (4)    
Liquids Pipelines | Tolling deferrals        
FINANCIAL STATEMENT EFFECTS        
Regulatory Liabilities     (39)  
Liquids Pipelines | Recoverable income taxes        
FINANCIAL STATEMENT EFFECTS        
Regulatory assets   CAD 54 46  
Recovery period   30 years    
Gas Distribution | Deferred income taxes        
FINANCIAL STATEMENT EFFECTS        
Regulatory assets   CAD 328 275  
Gas Distribution | Purchased gas variance        
FINANCIAL STATEMENT EFFECTS        
Regulatory assets   CAD 129 673  
Rolling period   12 months    
Additional rolling period 24 months      
Gas Distribution | Pension plans and OPEB        
FINANCIAL STATEMENT EFFECTS        
Regulatory assets   CAD 104 171  
Gas Distribution | Constant dollar net salvage adjustment        
FINANCIAL STATEMENT EFFECTS        
Regulatory assets   42 37  
Gas Distribution | Unabsorbed demand cost        
FINANCIAL STATEMENT EFFECTS        
Regulatory assets   66 14  
Recovery period       2 years
Gas Distribution | Future removal and site restoration reserves        
FINANCIAL STATEMENT EFFECTS        
Regulatory Liabilities   (581) (562)  
Gas Distribution | Site restoration clearance adjustment        
FINANCIAL STATEMENT EFFECTS        
Regulatory Liabilities   (193) (283)  
Gas Distribution | Transaction services deferral        
FINANCIAL STATEMENT EFFECTS        
Regulatory Liabilities   (9) (26)  
Gas Distribution | Revenue adjustment member        
FINANCIAL STATEMENT EFFECTS        
Regulatory Liabilities     (52)  
Sponsored Investments | Deferred income taxes        
FINANCIAL STATEMENT EFFECTS        
Regulatory assets   1,048 15  
Sponsored Investments | Pipeline future abandonment costs        
FINANCIAL STATEMENT EFFECTS        
Regulatory Liabilities   (43)    
Sponsored Investments | Tolling deferrals        
FINANCIAL STATEMENT EFFECTS        
Regulatory Liabilities   (39)    
Sponsored Investments | Transportation revenue adjustments        
FINANCIAL STATEMENT EFFECTS        
Regulatory assets   CAD 11 CAD 36  
Recovery period   5 years