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DEBT - Credit Facilities (Narrative) (Details) $ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 CAD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 CAD ($)
Line of Credit Facility [Line Items] |  |  |
Line of credit facility, increase (decrease) | $ 390 |  |
Weighted average standby fee (as a percent) | 0.20% | 0.20% |
Long-term debt | $ 60,327 |  | $ 60,865
Uncommitted credit facilities |  |  |
Line of Credit Facility [Line Items] |  |  |
Term credit facility | 807 |  | 792
Unutilized credit facility | 548 |  | 518
Commercial paper and credit facility draws |  |  |
Line of Credit Facility [Line Items] |  |  |
Long-term debt | 7,967 |  | 10,055
Enbridge Inc. | Credit Facility Maturing ind 2019 |  |  |
Line of Credit Facility [Line Items] |  |  |
Extinguishment of debt |  | $ 650 |
Enbridge Inc. | Unutilized Enbridge Credit Facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Extinguishment of debt |  | 100 |
Enbridge (U.S.) Inc. | Credit Facility Maturing ind 2019 |  |  |
Line of Credit Facility [Line Items] |  |  |
Extinguishment of debt |  | 500 |
Enbridge (U.S.) Inc. | Unutilized Credit Facility Maturing in 2019 |  |  |
Line of Credit Facility [Line Items] |  |  |
Extinguishment of debt |  | 950 |
Enbridge Energy Partners, L.P. |  |  |
Line of Credit Facility [Line Items] |  |  |
Extinguishment of debt |  | $ 625 |
Enbridge Income Fund |  |  |
Line of Credit Facility [Line Items] |  |  |
Term credit facility |  |  | $ 1,500
Westcoast Energy Inc. |  |  |
Line of Credit Facility [Line Items] |  |  |
Extinguishment of debt | $ 400 |  |

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- Definition Amount of increase (decrease) of the credit facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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