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DEBT - INTEREST EXPENSE (Details) - CAD
CAD in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
INTEREST EXPENSE      
Capitalized CAD (321) CAD (353) CAD (416)
Interest Expense, Total 1,590 1,624 1,129
Enbridge Inc.      
INTEREST EXPENSE      
Interest expense on debt 571 970 598
Enbridge (U.S.) Inc.      
INTEREST EXPENSE      
Interest expense on debt 43 54 19
Enbridge Energy Partners, L.P.      
INTEREST EXPENSE      
Interest expense on debt 609 369 458
Enbridge Gas Distribution Inc.      
INTEREST EXPENSE      
Interest expense on debt 193 175 154
The Fund      
INTEREST EXPENSE      
Interest expense on debt 119 106 76
Enbridge Pipelines (Southern Lights) L.L.C.      
INTEREST EXPENSE      
Interest expense on debt 56 45 36
Enbridge Pipelines Inc.      
INTEREST EXPENSE      
Interest expense on debt 262 210 171
Enbridge Southern Lights LP      
INTEREST EXPENSE      
Interest expense on debt 14 14 14
Midcoast Energy Partners, L.P.      
INTEREST EXPENSE      
Interest expense on debt 44 34 19
Debentures and term notes      
INTEREST EXPENSE      
Interest expense on debt 1,714 1,805 1,425
Commercial paper and credit facility draws      
INTEREST EXPENSE      
Interest expense on debt CAD 197 CAD 172 71
Southern Lights project financing      
INTEREST EXPENSE      
Interest expense on debt     CAD 49