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DISPOSITIONS (Details) $ in Millions, $ in Billions |  |  | 6 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 01, 2018 CAD ($) | May 09, 2018 CAD ($) | Jun. 30, 2018 CAD ($) | Jun. 30, 2017 CAD ($) | Jun. 30, 2019 CAD ($) | Dec. 31, 2018 CAD ($) | Aug. 01, 2018 USD ($) | Jul. 04, 2018 CAD ($) | May 09, 2018 USD ($) | Dec. 31, 2017 CAD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | $ 35,436 |  |  |  |  |  |  | $ 34,457
Deferred income tax recovery |  |  | 328 | $ (416) |  |  |  |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations | Texas Express NGL System |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Carrying amount of investment |  |  | 447 |  |  |  |  |  |  |
Goodwill |  |  | 262 |  |  |  |  |  |  |
Asset Impairment | Disposal Group, Held-for-sale, Not Discontinued Operations | Midcoast Operating L.P. |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Provision for loss (gain) on disposal, before income tax |  |  | 913 |  |  |  |  |  |  |
Provision for loss (gain) on disposal, net of tax |  |  | 701 |  |  |  |  |  |  |
Asset Impairment | Disposal Group, Held-for-sale, Not Discontinued Operations | Line 10 Crude Oil Pipeline |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Provision for loss (gain) on disposal, before income tax |  |  | 154 |  |  |  |  |  |  |
Provision for loss (gain) on disposal, net of tax |  |  | 95 |  |  |  |  |  |  |
Enbridge (U.S.) Inc. | Disposal Group, Held-for-sale, Not Discontinued Operations | Midcoast Operating L.P. |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Disposal group, consideration |  |  |  |  |  |  |  |  | $ 1.1 |
Subsequent Event | 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 |  |  |  |  |  |  |  | $ 4,310 |  |
Subsequent Event | Enbridge (U.S.) Inc. | Disposed of by sale, not discontinued operations | Midcoast Operating L.P. |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Disposal group, consideration |  |  |  |  |  |  | $ 1.1 |  |  |
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 | $ 2,500 |  |  |  |
CANADA | Renewable Energy Assets | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent |  |  |  |  |  |  |  |  | 49.00% |
UNITED STATES | Renewable Energy Assets | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent |  |  |  |  |  |  |  |  | 49.00% |
Hohe See Offshore Wind Project | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership interest in equity investment (as a percent) |  |  |  |  |  |  |  |  | 49.00% |
The Assets |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent |  |  |  |  |  |  |  |  | 51.00% |
Proceeds from sale of equity method investments |  | $ 1,750 |  |  |  |  |  |  |  |
Deferred income tax recovery |  |  | 190 |  |  |  |  |  |  |
The Assets | Renewable Energy Assets |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Deferred income tax recovery |  |  | $ 258 |  |  |  |  |  |  |
The Assets | Subsequent Event |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from sale of equity method investments | $ 1,750 |  |  |  |  |  |  |  |  |

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