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DISPOSITIONS - Dispositions (Narrative) (Details) $ in Millions |  |  |  |  |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 01, 2020 CAD ($) | May 01, 2020 CAD ($) | Apr. 01, 2020 CAD ($) | Dec. 31, 2019 CAD ($) | Nov. 01, 2019 CAD ($) | Oct. 01, 2019 CAD ($) | Oct. 01, 2019 USD ($) | Oct. 01, 2018 CAD ($) | Aug. 01, 2018 CAD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2018 CAD ($) | Jul. 04, 2018 CAD ($) | Jun. 30, 2018 CAD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of goodwill |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 1,019,000,000 |  |
Deferred income tax expense/(recovery) (Note 25) |  |  |  |  |  |  |  |  |  | 447,000,000 | 1,156,000,000 | (148,000,000) |  |
Impairment loss |  |  |  |  |  |  |  |  |  |  | 423,000,000 | 1,104,000,000 |  |
Goodwill |  |  |  | $ 33,153,000,000 |  |  |  |  |  | 32,688,000,000 | 33,153,000,000 | 34,459,000,000 |  |
Gain on disposal of assets |  |  |  |  |  |  |  |  |  | 6,000,000 | (254,000,000) | (8,000,000) |  |
Liquids Pipelines |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | 7,951,000,000 |  |  |  |  |  | $ 7,828,000,000 | 7,951,000,000 | 8,324,000,000 |  |
Disposal group, held-for-sale, not discontinued operations | Montana-Alberta Tie Line (MATL) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets to be disposed of |  |  |  |  |  |  |  |  |  |  | 297,000,000 |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investment |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 447,000,000
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 262,000,000
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal of interest | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Dispositions | Montana-Alberta Tie Line (MATL) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal of interest |  | $ 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds from sale of interest |  | $ 189,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Dispositions | Ozark Pipeline |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal of interest |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |
Cash proceeds from sale of interest |  |  | $ 63,000,000 |  |  |  |  |  |  |  |  |  |  |
Dispositions | St. Lawrence Gas |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal of interest |  |  |  |  |  |  |  |  |  |  | (10,000,000) |  |  |
Cash proceeds from sale of interest |  |  |  |  | $ 72,000,000 |  |  |  |  |  |  |  |  |
Dispositions | Enbridge Gas New Brunswick |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal of interest |  |  |  |  |  | $ (3,000,000) |  |  |  |  |  |  |  |
Cash proceeds from sale of interest |  |  |  |  |  |  | $ 331 |  |  |  |  |  |  |
Goodwill included in assets subsequently disposed |  |  |  |  |  | $ 133,000,000 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,300,000,000 |
Impairment of goodwill |  |  |  |  |  |  |  |  |  |  |  | 1,000,000,000.0 |  |
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 |  |  |  |  |  |  |  |  |  |  |  | 62,000,000 |  |
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 |  |  |  |  |  |  |  |  |  |  |  | 17,000,000 |  |
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 |  |  |  |  |  |  |  |  |  |  |  | 38,000,000 |  |
Gain on disposal of assets |  |  |  |  |  |  |  |  |  |  |  | 29,000,000 |  |
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 |  |  |  |  |  |  |  |  |  |  |  | (20,000,000) |  |
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 |  |  |  |  |  |  |  |  |  |  |  | $ 154,000,000 |  |
Canadian Renewable Assets | Dispositions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest (percent) |  |  |  |  |  |  |  |  | 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 (percent) |  |  |  |  |  |  |  |  | 49.00% |  |  |  |  |
Provincially Regulated Facilities | Dispositions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill included in assets subsequently disposed |  |  |  |  |  |  |  |  |  |  |  | $ 366,000,000 |  |
Cash proceeds from sale of assets |  |  |  |  |  |  |  | $ 2,500,000,000 |  |  |  |  |  |
Gain on disposal of assets |  |  |  |  |  |  |  |  |  |  |  | 34,000,000 |  |
Federally Regulated Facilities | Dispositions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill included in assets subsequently disposed |  |  |  |  |  |  |  |  |  |  |  | 55,000,000 |  |
Cash proceeds from sale of assets |  |  |  | 1,700,000,000 |  |  |  |  |  |  |  |  |  |
Gain on disposal of assets |  |  |  |  |  |  |  |  |  |  | (268,000,000) |  |  |
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% |  |  |  |  |
The Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income tax expense/(recovery) (Note 25) |  |  |  |  |  |  |  |  |  |  |  | (196,000,000) |  |
The Assets | Dispositions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of equity method investments |  |  |  |  |  |  |  |  | $ 1,750,000,000 |  |  |  |  |
The Assets | Renewable energy assets | Dispositions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest (percent) |  |  |  |  |  |  |  |  |  | 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 expense/(recovery) (Note 25) |  |  |  |  |  |  |  |  |  |  |  | (267,000,000) |  |
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 |  |  |  |  |  |  |  |  | (41,000,000) |  |  |  |  |
Disposal group, consideration |  |  |  |  |  |  |  |  | 1,400,000,000 |  |  |  |  |
Impairment loss |  |  |  |  |  |  |  |  |  |  |  | $ 913,000,000 |  |
Other long-term liabilities (long-term liabilities held for sale) |  |  |  | $ 299,000,000 |  |  |  |  | $ 387,000,000 | $ 225,000,000 | $ 299,000,000 |  |  |

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