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REGULATORY MATTERS - Liquids Pipelines (Narrative) (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Public Utilities, General Disclosures [Line Items] |  |
Regulatory Liabilities | $ 3,828 | $ 3,791
Regulatory assets | 5,707 | 6,467
Canadian Mainline |  |
Public Utilities, General Disclosures [Line Items] |  |
Regulatory deferred assets | 1,900 | $ 2,100
Decrease in regulatory tax asset | 160 |
Deferred tax liabilities, regulatory assets | 40 |
Southern Lights Pipeline |  |
Public Utilities, General Disclosures [Line Items] |  |
Deferred tax liabilities, regulatory assets | $ 23 |
Pre-determined after-tax rate of return on equity (ROE) (as a percent) | 10.00% |
Regulatory Liabilities | $ 151 |
Regulatory assets | $ 92 |

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