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DEBT - NARRATIVE (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 CAD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 CAD ($)
Line of Credit Facility [Line Items] |  |  |
Commitment fee percentage | 0.20% | 0.20% |
Long-term debt | $ 61,191,000,000 |  | $ 60,865,000,000
Uncommitted demand credit facilities |  |  |
Line of Credit Facility [Line Items] |  |  |
Amount of credit facility | 790,000,000 |  | 792,000,000
Unutilized amount of facility | 511,000,000 |  | 518,000,000
Commercial paper and credit facility draws |  |  |
Line of Credit Facility [Line Items] |  |  |
Long-term debt | 9,832,000,000 |  | $ 10,055,000,000
Enbridge (U.S.) Inc. |  |  |
Line of Credit Facility [Line Items] |  |  |
Extinguishment of debt |  | $ 950 |
Westcoast Energy Inc |  |  |
Line of Credit Facility [Line Items] |  |  |
Extinguishment of debt | $ 400,000,000 |  |
Enbridge Inc. |  |  |
Line of Credit Facility [Line Items] |  |  |
Extinguishment of debt |  | $ 650 |

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