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ACQUISITIONS AND DISPOSITIONS - Dispositions (Narrative) (Details) € in Millions, $ in Millions, $ in Millions |  |  |  |  |  | 12 Months Ended |  |  |  |  |
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Oct. 01, 2018 CAD ($) | Aug. 01, 2018 CAD ($) | Aug. 01, 2018 EUR (€) | Aug. 01, 2018 USD ($) | Jul. 31, 2017 CAD ($) | Jul. 31, 2017 USD ($) | Mar. 01, 2017 CAD ($) | Mar. 01, 2017 USD ($) | Dec. 01, 2016 CAD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CAD ($) | Dec. 31, 2018 USD ($) | Aug. 01, 2018 USD ($) | Jul. 04, 2018 CAD ($) | Jun. 30, 2018 CAD ($) | Feb. 08, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income tax (recovery)/expense |  |  |  |  |  |  |  |  |  | $ (148) |  | $ (2,877) |  | $ 43 |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  | 34,459 |  | 34,457 |  |  |  |  |  |  |
Impairment loss |  |  |  |  |  |  |  |  |  | 1,104 |  | 4,463 |  | 1,376 |  |  |  |  |
Goodwill impairment |  |  |  |  |  |  |  |  |  | 1,019 |  | 102 |  | 0 |  |  |  |  |
Gain on disposal of assets |  |  |  |  |  |  |  |  |  | (8) |  | 120 |  | $ 848 |  |  |  |  |
Gas Transmission and Midstream |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  | 20,777 |  | 20,997 |  |  |  |  |  |  |
Impairment loss |  |  |  |  |  |  |  |  |  |  |  | 4,400 |  |  |  |  |  |  |
Impairment loss, after-tax |  |  |  |  |  |  |  |  |  |  |  | 2,800 |  |  |  |  |  |  |
Goodwill impairment |  |  |  |  |  |  |  |  |  | 1,019 |  | 102 |  |  |  |  |  |  |
Liquids Pipelines |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  | 8,324 |  | 7,786 |  |  |  |  |  |  |
Goodwill impairment |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Canadian Renewable Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposal of interest |  | $ 62 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | United States Renewable Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposal of interest |  | 17 |  | $ 13 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | 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 | $ 30 | 148 | $ 111 |  |  |  |  |  |
Gain on disposal of assets |  |  |  |  |  |  |  |  |  | 29 | $ 22 | 83 | $ 63 |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | 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 |  |  |  |  | $ 203 | $ 160 |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | 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 |  |  |  |  |  |  | $ 294 | $ 220 |  |  |  |  |  |  |  |  |  |  |
Gain on disposal of assets |  |  |  |  |  |  | $ 14 | $ 10 |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Liquids Pipelines | South Prairie Region |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds from sale of assets |  |  |  |  |  |  |  |  | $ 1,100 |  |  |  |  |  |  |  |  |  |
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) |  |  |  |  |  |  |  |  |  | 96 |  | $ 34 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  | 55 |  |  |  |  |  |  |  |  |
Goodwill impairment |  |  |  |  |  |  |  |  |  | 1,019 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 447 |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 262 |
Other income/(expense) | 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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposal of interest | $ 34 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income/(expense) | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Hohe See Offshore Wind Project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposal of interest |  | $ 20 | € 14 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income/(expense) | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Liquids Pipelines | Olympic Pipeline |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposal of interest |  |  |  |  | $ 27 | $ 21 |  |  |  |  |  |  |  |  |  |  |  |  |
Other income/(expense) | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Liquids Pipelines | South Prairie Region |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposal of interest |  |  |  |  |  |  |  |  | $ 850 |  |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued operation, provision for loss (gain) on disposal, before income tax |  |  |  |  |  |  |  |  |  | 913 |  |  |  |  |  |  |  |  |
Discontinued operation, provision for loss (gain) on disposal, net of tax |  |  |  |  |  |  |  |  |  | 701 |  |  |  |  |  |  |  |  |
Canadian Renewable 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% |  |  |  |  |  |  |  |  |  |  |  |  |  | 49.00% |  |  |
United States Renewable 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% |  |  |  |  |  |  |  |  |  |  |  |  |  | 49.00% |  |  |
Hohe See Offshore Wind Project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest of equity method investment (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00%
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 of equity method investment (as a percent) |  | 49.00% |  |  |  |  |  |  |  |  |  |  |  |  |  | 49.00% |  |  |
The Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 [Member] | 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 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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. | Disposal Group, 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 |  | $ 1,400 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,100 |  |  |
Gain on disposal of interest |  | 41 |  | $ 32 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other long-term liabilities (long-term liabilities held for sale) |  | $ 387 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 298 |  |  |
Accounts payable and other | Enbridge (U.S.) Inc. | Disposal Group, 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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other long-term liabilities (long-term liabilities held for sale) |  |  |  |  |  |  |  |  |  | 79 |  |  |  |  | $ 58 |  |  |  |
Other Long-Term Liabilities [Member] | Enbridge (U.S.) Inc. | Disposal Group, 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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other long-term liabilities (long-term liabilities held for sale) |  |  |  |  |  |  |  |  |  | $ 296 |  |  |  |  | $ 216 |  |  |  |

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