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Debt and Capital Structure - Summary of Net Debt to Adjusted EBITDA (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 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2023
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |  |  |  |  |  |  |
Short-Term Borrowings | $ 0 |  | $ 0 |  | $ 0 | $ 173 |  |  |
Current Portion of Long-Term Debt | 0 |  | 0 |  | 0 | 192 |  |  |
Long-Term Portion of Long-Term Debt | 7,156 |  | 7,156 |  | 7,156 | 7,342 |  |  |
Less: Cash and Cash Equivalents | (1,901) | $ (3,104) | (1,901) | $ (3,104) | (1,901) | (3,093) | $ (2,563) | $ (3,154) | $ (2,227)
Net Debt | 5,255 |  | 5,255 |  | $ 5,255 | $ 4,614 |  |  |
Net Earnings (Loss) | 1,286 | 820 | 2,996 | 2,996 |  |  |  |  |
Add (Deduct): |  |  |  |  |  |  |  |  |
Foreign Exchange (Gain) Loss, Net | 157 | (73) | (196) | 81 |  |  |  |  |
(Gain) Loss on Divestiture of Assets | (106) | (17) | (109) | (121) |  |  |  |  |
Re-measurement of Contingent Payments | 0 | 0 | 0 | 30 |  |  |  |  |
Other (Income) Loss, Net | (22) | $ (28) | (54) | $ (158) |  |  |  |  |
Net Debt to Adjusted EBITDA (times) |  |  |  |  | 60.00% | 50.00% |  |  |
Rolling Twelve Month Basis |  |  |  |  |  |  |  |  |
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |  |  |  |  |  |  |
Short-Term Borrowings | 0 |  | 0 |  | $ 0 | $ 173 |  |  |
Current Portion of Long-Term Debt | 0 |  | 0 |  | 0 | 192 |  |  |
Long-Term Portion of Long-Term Debt | 7,156 |  | 7,156 |  | 7,156 | 7,342 |  |  |
Total Debt | 7,156 |  | 7,156 |  | 7,156 | 7,707 |  |  |
Less: Cash and Cash Equivalents | (1,901) |  | (1,901) |  | (1,901) | (3,093) |  |  |
Net Debt | $ 5,255 |  | $ 5,255 |  | 5,255 | 4,614 |  |  |
Net Earnings (Loss) |  |  |  |  | 3,142 | 3,142 |  |  |
Add (Deduct): |  |  |  |  |  |  |  |  |
Finance Costs, Net |  |  |  |  | 524 | 514 |  |  |
Income Tax Expense (Recovery) |  |  |  |  | 485 | 929 |  |  |
Depreciation, Depletion and Amortization |  |  |  |  | 5,045 | 4,871 |  |  |
Exploration and Evaluation Asset Write-downs |  |  |  |  | (3) | 37 |  |  |
(Income) Loss From Equity-Accounted Affiliates |  |  |  |  | (63) | (66) |  |  |
Unrealized (Gain) Loss on Risk Management |  |  |  |  | (84) | 12 |  |  |
Foreign Exchange (Gain) Loss, Net |  |  |  |  | 185 | 462 |  |  |
(Gain) Loss on Divestiture of Assets |  |  |  |  | (107) | (119) |  |  |
Re-measurement of Contingent Payments |  |  |  |  | 0 | 30 |  |  |
Other (Income) Loss, Net |  |  |  |  | 49 | (55) |  |  |
Adjusted EBITDA |  |  |  |  | $ 9,173 | $ 9,757 |  |  |

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