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PENSION AND OTHER POSTRETIREMENT BENEFITS - Amount Recognized in Excess of Accumulated Other Comprehensive Income (Details) - CAD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Canada |  |
Pension and Other Postretirement Benefit Disclosures |  |
Accumulated benefit obligation | $ 404 | $ 394
Fair value of plan assets | 283 | 243
Canada | OPEB |  |
Pension and Other Postretirement Benefit Disclosures |  |
Accumulated benefit obligation | 210 | 228
Fair value of plan assets | 0 | 0
Projected benefit obligation | 428 | 416
Fair value of plan assets | 283 | 243
US |  |
Pension and Other Postretirement Benefit Disclosures |  |
Accumulated benefit obligation | 107 | 99
Fair value of plan assets | 0 | 0
US | OPEB |  |
Pension and Other Postretirement Benefit Disclosures |  |
Accumulated benefit obligation | 100 | 78
Fair value of plan assets | 88 | 63
Projected benefit obligation | 107 | 99
Fair value of plan assets | $ 0 | $ 0

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