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SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized | $ 166 |  |
Largest Non-Affiliated Customer | Sales Revenue, Net | Customer Concentration Risk |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Concentration (percent) |  | 13.50% | 13.60%
Transportation revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue recognized | $ 238 | $ 127 | $ 292

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