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VARIABLE INTEREST ENTITIES - CONSOLIDATED VARIABLE INTEREST ENTITIES (Narrative) (Details) |  | 12 Months Ended
--- | --- | ---
Aug. 01, 2018 | Dec. 31, 2018 | Dec. 31, 2017
EECI |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership interest in subsidiary (as a percent) |  | 100.00% |
EIPLP | Alliance Pipeline |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership interest of equity method investment (as a percent) |  | 50.00% |
Enbridge Management Services Inc. |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership interest in subsidiary (as a percent) |  | 100.00% |
Enbridge Canadian Renewable LP (ECRLP) | Canada Pension Plan Investment Board (CPPIB) |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Direct common interest (as a percent) | 49.00% |  |
EEP |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Economic interest (as a percent) |  | 100.00% | 34.60%
Enbridge Income Fund |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Direct common interest (as a percent) |  |  | 29.40%
Economic interest (as a percent) |  | 100.00% | 82.50%
EIPLP |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Direct common interest (as a percent) |  |  | 53.10%
Economic interest (as a percent) |  | 100.00% | 73.50%
DakTex |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership interest in subsidiary (as a percent) |  | 75.00% |
DakTex | EEP |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership interest in subsidiary (as a percent) |  | 25.00% |
Bakken Pipeline System |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership interest of equity method investment (as a percent) |  | 27.60% |
Spectra Energy Partners, LP |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Direct common interest (as a percent) |  | 100.00% | 75.00%
Other Limited Partnerships |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Direct common interest (as a percent) |  | 100.00% |

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