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Disposition (Details) - CAD ($) $ in Millions |  | 7 Months Ended | 10 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 01, 2023 | Nov. 01, 2023 | Nov. 01, 2023 | Dec. 31, 2024 | Dec. 31, 2023
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gain on disposition |  |  |  | $ 0 | $ 23
Disposal group, held-for-sale, not discontinued operations | Aitken creek disposal |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Proceeds on disposition | $ 470 | $ 470 | $ 470 |  |
Gain on disposition | 23 |  |  |  |
Gain on disposition, after tax | $ 10 |  |  |  |
Earnings before tax, excluding the gain on disposition |  | $ 5 | $ 20 |  |

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