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AQUISITIONS AND DISPOSITIONS - Narrative (Details) $ in Millions, $ in Millions | 1 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 31, 2019 CAD ($) | Aug. 31, 2017 CAD ($) | Aug. 31, 2017 USD ($) | Jun. 30, 2019 CAD ($) | Jun. 30, 2018 CAD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2018 CAD ($) | Oct. 01, 2018 CAD ($) | Jul. 04, 2018 CAD ($)
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 |  |  | $ 2,785 | $ 3,243 |  |  |  |
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 |  |  |
Enbridge Gas Distribution | Disposal Group, Held-for-sale, Not Discontinued Operations | St. Lawrence Gas Company |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from divestiture of interest in subsidiaries and affiliates |  | $ 76 | $ 58 |  |  |  |  |  |

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