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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