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ACQUISITIONS AND DISPOSITIONS - Assets Held for Sale (Narrative) (Details) - Disposal group, held-for-sale, not discontinued operations - CAD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
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 |
Asset Impairment | 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

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