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Debt and Capital Structure - Summary of Net Debt to Adjusted EBITDA (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of objectives, policies and processes for managing capital [line items]      
Short-Term Borrowings $ 173 $ 179  
Long-Term Debt 192 0  
Long-Term Portion of Long-Term Debt 7,342 7,108  
Total Debt 7,500 7,100  
Less: Cash and Cash Equivalents (3,093) (2,227) $ (4,524)
Net Debt 4,614 5,060  
Net Earnings (Loss) 3,142 4,109  
Add (Deduct):      
Foreign Exchange (Gain) Loss, Net 462 (67)  
(Gain) Loss on Divestiture of Assets [1] (119) 20  
Re-measurement of Contingent Payments (30) (59)  
Other (Income) Loss, Net $ (55) $ (63)  
Net Debt to Adjusted EBITDA 50.00% 50.00%  
Rolling Twelve Month Basis      
Disclosure of objectives, policies and processes for managing capital [line items]      
Short-Term Borrowings $ 173 $ 179  
Long-Term Portion of Long-Term Debt 7,342 7,108  
Total Debt 7,707 7,287  
Less: Cash and Cash Equivalents (3,093) (2,227)  
Net Debt 4,614 5,060  
Net Earnings (Loss) 3,142 4,109  
Add (Deduct):      
Finance Costs, Net 514 538  
Income Tax Expense (Recovery) 929 931  
Depreciation, Depletion and Amortization 4,871 4,644  
Exploration and Evaluation Asset Write-downs 37 29  
(Income) Loss From Equity-Accounted Affiliates (66) (51)  
Unrealized (Gain) Loss on Risk Management 12 52  
Foreign Exchange (Gain) Loss, Net 462 (67)  
(Gain) Loss on Divestiture of Assets (119) 20  
Re-measurement of Contingent Payments 30 59  
Other (Income) Loss, Net (55) (63)  
Adjusted EBITDA $ 9,757 $ 10,201  
[1]
(1)Revised presentation as of January 1, 2024. See Note 4.