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ACQUISITIONS AND 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 ($) | Oct. 01, 2019 USD ($) | Dec. 31, 2021 CAD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2019 CAD ($) | Oct. 01, 2019 CAD ($) | Jul. 04, 2018 CAD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on disposal of assets |  |  |  |  |  |  | $ 319,000,000 | $ 6,000,000 | $ (254,000,000) |  |
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 | 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
Federally Regulated Facilities | Dispositions |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash proceeds from sale of assets |  |  |  | $ 1,700,000,000 |  |  |  |  |  |  |
Gain on disposal of assets |  |  |  |  |  |  |  |  | $ (268,000,000) |  |

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