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ACQUISITIONS AND DISPOSITIONS - Assets Held for Sale (Narrative) (Details) $ in Millions, $ in Millions | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Aug. 31, 2017 CAD ($) | Aug. 31, 2017 USD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2016 CAD ($) | Jun. 30, 2019 CAD ($) | Oct. 01, 2018 CAD ($) | Jul. 04, 2018 CAD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Goodwill (Note 16) |  |  | $ 34,459 | $ 34,457 |  |  |  |
Goodwill impairment |  |  | 1,019 | $ 102 | $ 0 |  |  |
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 |  |  |  |  |
Goodwill (Note 16) |  |  | 133 |  |  |  |  |
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
Goodwill (Note 16) |  |  | 55 |  |  |  |  |
Goodwill impairment |  |  | 1,019 |  |  |  |  |
Disposal Group, 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 |
Gas Distribution | Disposal group, held-for-sale, not discontinued operations | St. Lawrence Gas |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Cash proceeds from sale | $ 96 | $ 70 |  |  |  |  |  |
Scenario, Forecast | Disposal Group, 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 |  |
Asset Impairment | Disposal group, held-for-sale, not discontinued operations | Line 10 Crude Oil |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Discontinued operation, provision for loss (gain) on disposal, before income tax |  |  | 154 |  |  |  |  |
Discontinued operation, provision for loss (gain) on disposal, net of tax |  |  | $ 95 |  |  |  |  |

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