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Supplementary Cash Flow Information - Non-Cash Working Capital (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure Of Supplementary Cash Flow Information [Abstract] |  |
Accounts Receivable and Accrued Revenues | $ 547 | $ 314
Income Tax Receivable | 199 | (295)
Inventories | (117) | 216
Accounts Payable and Accrued Liabilities | 299 | (685)
Income Tax Payable | 322 | (1,112)
Total Change in Non-Cash Working Capital | 1,250 | (1,562)
Net Change in Non-Cash Working Capital – Operating Activities | 1,305 | (1,193)
Net Change in Non-Cash Working Capital – Investing Activities | $ (55) | $ (369)

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