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Debt and Capital Structure - Schedule of Net Debt to Adjusted Funds Flow (Details) - CAD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Dec. 31, 2024
Borrowings [abstract] |  |  |  |  |  |
Net Debt | $ 5,255 |  | $ 5,255 |  | $ 5,255 | $ 4,614
Cash From (Used in) Operating Activities | 2,131 | $ 2,474 | 5,820 | $ 7,206 | 7,849 | 9,235
Settlement of Decommissioning Liabilities | (94) | (74) | (198) | (170) | (262) | (234)
Net Change in Non-Cash Working Capital | $ (241) | $ 588 | $ (179) | $ 813 | 313 | 1,305
Adjusted funds flow |  |  |  |  | $ 7,798 | $ 8,164
Net Debt to Adjusted Funds Flow (times) |  |  |  |  | 70.00% | 60.00%

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- Definition Increase (Decrease) in Working Capital, Operating Activities + References No definition available. + Details
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- Definition The cash flows from (used in) operating activities, which are the principal revenue-producing activities of the entity and other activities that are not investing or financing activities, from continuing and discontinued operations. [Refer: Revenue] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 10 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_10&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 50 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_50_d&doctype=Standard -URIDate 2024-03-27 + Details
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