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DEBT - NARRATIVE (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 CAD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 CAD ($) | Mar. 31, 2018 USD ($) | Jun. 30, 2018 CAD ($) | Dec. 31, 2017 CAD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |
Commitment fee percentage |  |  |  |  | 0.20% |
Long-term debt | $ 59,940,000,000 |  |  |  | $ 59,940,000,000 | $ 60,865,000,000
Long-term debt, fair value adjustment |  |  |  |  | 1,015,000,000 |
Amortization of fair value adjustment | 26,000,000 |  |  |  | 88,000,000 |
Uncommitted demand credit facilities |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Amount of credit facility | 796,000,000 |  |  |  | 796,000,000 | 792,000,000
Unutilized amount of facility | 517,000,000 |  |  |  | 517,000,000 | 518,000,000
Commercial paper and credit facility draws |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Long-term debt | $ 7,862,000,000 |  |  |  | $ 7,862,000,000 | $ 10,055,000,000
Enbridge (U.S.) Inc. |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Extinguishment of debt |  | $ 500 |  | $ 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 |  | $ 100 |  | $ 650 |  |

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