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REGULATORY MATTERS - Liquids Pipelines (Narrative) (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Public Utilities, General Disclosures [Line Items] |  |
Regulatory assets | $ 5,629 | $ 5,112
Canadian Mainline |  |
Public Utilities, General Disclosures [Line Items] |  |
Term of CTS establishing a Canadian Local Toll | 10 years |
Regulatory assets | $ 1,900 | $ 1,800
Southern Lights Pipeline |  |
Public Utilities, General Disclosures [Line Items] |  |
Pre-determined after-tax rate of return on equity (ROE) (as a percent) | 10.00% |

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