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ACQUISITIONS AND DISPOSITIONS - Dispositions (Narrative) (Details) € in Millions, $ in Millions, $ in Millions |  |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2019 CAD ($) | Nov. 01, 2019 USD ($) | Nov. 01, 2019 CAD ($) | Oct. 01, 2019 USD ($) | Oct. 01, 2019 CAD ($) | Oct. 01, 2018 CAD ($) | Aug. 01, 2018 USD ($) | Aug. 01, 2018 CAD ($) | Jul. 04, 2018 CAD ($) | Jul. 31, 2017 USD ($) | Jul. 31, 2017 CAD ($) | Mar. 01, 2017 USD ($) | Mar. 01, 2017 CAD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2018 EUR (€) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2018 CAD ($) | Aug. 01, 2018 CAD ($) | Jul. 31, 2018 | Jun. 30, 2018 CAD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 33,153 | $ 34,459 |  |  |
Deferred income tax (recovery)/expense |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,156 |  | $ (148) |  |  | $ (2,877) |  |  |  |  |  |
Impairment loss |  |  |  |  |  |  |  |  |  |  |  |  |  | 423 |  | 1,104 |  |  | 4,463 |  |  |  |  |  |
Impairment of goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 1,019 |  |  | 102 |  |  |  |  |  |
Gain on disposal of assets |  |  |  |  |  |  |  |  |  |  |  |  |  | (254) |  | (8) |  |  | 120 |  |  |  |  |  |
Liquids Pipelines |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,951 | 8,324 |  |  |
Impairment of goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Dispositions | St. Lawrence Gas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds from sale of interest |  | $ 55 | $ 72 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal of interest |  |  | $ (10) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dispositions | Enbridge Gas New Brunswick |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds from sale of interest |  |  |  | $ 331 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal of interest |  |  |  |  | $ (3) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill included in assets subsequently disposed |  |  |  |  | $ 133 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dispositions | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of goodwill |  |  |  |  |  |  |  |  | $ 1,019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dispositions | Canadian Renewable Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal of interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 62 |  |  |  |  |  |  |  |  |
Dispositions | United States Renewable Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal of interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13 | 17 |  |  |  |  |  |  |  |  |
Dispositions | Liquids Pipelines | Sandpiper |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds from sale of assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 | 38 |  | $ 111 | 148 |  |  |  |  |  |
Gain on disposal of assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22 | 29 |  | $ 63 | $ 83 |  |  |  |  |  |
Dispositions | Liquids Pipelines | Olympic Pipeline |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds from sale of interest |  |  |  |  |  |  |  |  |  | $ 160 | $ 203 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dispositions | Liquids Pipelines | Ozark Pipeline |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds from sale of assets |  |  |  |  |  |  |  |  |  |  |  | $ 220 | $ 294 |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposal of assets |  |  |  |  |  |  |  |  |  |  |  | $ 10 | $ 14 |  |  |  |  |  |  |  |  |  |  |  |
Disposal group, held-for-sale, not discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other long-term liabilities (long-term liabilities held for sale) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 96 |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 262
Equity investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 447
Other income/(expense) | Dispositions | Hohe See Offshore Wind Project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal of interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (20) | € (14) |  |  |  |  |  |  |  |
Other income/(expense) | Dispositions | Liquids Pipelines | Olympic Pipeline |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal of interest |  |  |  |  |  |  |  |  |  | $ 21 | $ 27 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Canadian Renewable Assets | Dispositions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49.00% | 49.00% |  |  |  |  | 49.00% |
United States Renewable Assets | Dispositions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49.00% |
Federally Regulated Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill included in assets subsequently disposed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 55 |  |  |  |
Cash proceeds from sale of assets | $ 1,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposal of assets |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (268) |  |  |  |  |  |  |  |  |  |  |
Provincially Regulated Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds from sale of assets |  |  |  |  |  | $ 2,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposal of assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 34 |  |  |  |  |  |  |  |  |
Hohe See Offshore Wind Project | Dispositions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest of equity method investment (as a percent) |  |  |  |  |  |  | 49.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49.00% | 49.00% |
The Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of equity method investments |  |  |  |  |  |  |  | $ 1,750 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income tax (recovery)/expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (196) |  |  |  |  |  |  |  |  |
The Assets | Renewable energy assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51.00% | 51.00% |  |  |  |
Renewable energy assets | The Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income tax (recovery)/expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (267) |  |  |  |  |  |  |  |  |
Enbridge (U.S.) Inc. | Dispositions | Midcoast Operating L.P. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal of interest |  |  |  |  |  |  | $ (32) | $ (41) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal group, consideration |  |  |  |  |  |  | 1,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,400 |  |
Impairment loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 913 |  |  | $ 4,400 |  |  |  |  |  |
Other long-term liabilities (long-term liabilities held for sale) |  |  |  |  |  |  | $ 298 |  |  |  |  |  |  |  | $ 274 |  |  |  |  | $ 230 | $ 299 | $ 375 | $ 387 |  |
Impairment of goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 102 |  |  |  |  |  |

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