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AQUISITIONS AND DISPOSITIONS - Narrative (Details) - CAD ($) $ in Millions | 1 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Oct. 01, 2018 | Jul. 04, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Cash consideration for acquisition of property, plant and equipment | $ 265 | $ 3,928 | $ 4,584 |  |  |  |
Sale of noncontrolling interests in subsidiaries |  | $ 0 | $ 1,289 |  |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations | Enbridge Gas New Brunswick |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Disposal group, consideration |  |  |  |  | $ 331 |  |
Disposal Group, Held-for-sale, Not Discontinued Operations | Canadian Natural Gas Gathering and Processing Business |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Disposal group, consideration |  |  |  |  |  |  | $ 4,300
Disposed of by sale, not discontinued operations | Canadian Natural Gas Gathering and Processing Business |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Disposal group, consideration |  |  |  |  |  | $ 2,500 |
Scenario, Forecast | Disposed of by sale, not discontinued operations | Canadian Natural Gas Gathering and Processing Business |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Disposal group, consideration |  |  |  | $ 1,800 |  |  |

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