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SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized | $ 246 |  |
Largest Non-Affiliated Customer | Sales Revenue, Net | Customer Concentration Risk |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Concentration (percent) | 10.00% | 10.00% | 13.50%
Transportation revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized | $ 210 | $ 238 | $ 127

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