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Supplemental Disclosure of Cash Flow Information - Supplemental Schedule of Cash Flow Information (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Changes in Non-Cash Working Capital [Abstract] |  |  |
Accounts receivable | $ (940) | $ 368 | $ (441)
Inventory | (616) | (219) | (266)
Prepaids and other | (42) | (23) | (20)
Accounts payable | (340) | 78 | 537
Accrued liabilities | 851 | (812) | 896
Current income tax (liabilities) assets | 326 | (1,558) | (282)
Other long-term liabilities | (106) | (200) | (196)
Net changes in non-cash working capital | (867) | (2,366) | 228
Relating To [Abstract] |  |  |
Operating activities | (743) | (2,417) | 79
Investing activities | $ (124) | $ 51 | $ 149

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