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ACQUISITIONS AND DISPOSITIONS - Dispositions (Narrative) (Details) |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 01, 2020 CAD ($) | May 01, 2020 CAD ($) | Apr. 01, 2020 CAD ($) | Dec. 31, 2022 CAD ($) | Oct. 05, 2022 CAD ($) _community pipeline
Athabasca Indigenous Investments Limited Partnership |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of communities represented | _community |  |  |  |  | 23
Athabasca Regional Oil Sands System |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Number of pipelines to be sold | pipeline |  |  |  |  | 7
Disposal group, consideration |  |  |  |  | $ 1,100,000,000
Athabasca Regional Oil Sands System | Athabasca Regional Oil Sands System |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Ownership interest percentage held by noncontrolling owners |  |  |  |  | 11.60%
Noncontrolling interest (percent) |  |  |  |  | 88.40%
Dispositions | 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 | 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 | Athabasca Regional Oil Sands System |  |  |  |  |
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 |  |  |

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