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Debt and Capital Structure - Summary of Net Debt to Adjusted EBITDA (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of objectives, policies and processes for managing capital [line items]        
Short-Term Borrowings $ 115 $ 79    
Current Portion of Long-Term Debt 0 0 $ 0  
Long-Term Portion of Long-Term Debt 8,691 12,385    
Total Debt 8,691 12,385    
Less: Cash and Cash Equivalents (4,524) (2,873) (378) $ (186)
Net Debt 4,282 9,591 7,184  
Net Earnings (Loss) 6,450 587 [1] (2,379) [1]  
Add (Deduct):        
Interest Income (81) (23) [1] (9) [1]  
Foreign Exchange (Gain) Loss, Net 343 (174) [1] (181) [1]  
Revaluation (Gains) 549 0 0  
Re-measurement of Contingent Payment (162) (575) [1] 80 [1]  
Other (Income) Loss, Net $ (532) $ (309) [1] $ 40 [1]  
Net Debt to Adjusted EBITDA 30.00% 120.00% 1190.00%  
Rolling Twelve Month Basis        
Disclosure of objectives, policies and processes for managing capital [line items]        
Short-Term Borrowings $ 115 $ 79 $ 121  
Long-Term Portion of Long-Term Debt 8,691 12,385 7,441  
Total Debt 8,806 12,464 7,562  
Less: Cash and Cash Equivalents (4,524) (2,873) (378)  
Net Debt 4,282 9,591 7,184  
Net Earnings (Loss) 6,450 587 (2,379)  
Add (Deduct):        
Finance Costs 820 1,082 536  
Interest Income (81) (23) (9)  
Income Tax Expense (Recovery) 2,281 728 (851)  
Depreciation, Depletion and Amortization 4,679 5,886 3,464  
E&E Asset Write-downs 64 18 91  
(Income) Loss From Equity-Accounted Affiliates (15) (57) 0  
Unrealized (Gain) Loss on Risk Management (126) 2 56  
Foreign Exchange (Gain) Loss, Net 343 (174) (181)  
Revaluation (Gains) (549) 0 0  
Re-measurement of Contingent Payment 162 575 (80)  
(Gain) Loss on Divestiture of Assets (269) (229) (81)  
Other (Income) Loss, Net (532) (309) 40  
Adjusted EBITDA $ 13,227 $ 8,086 $ 606  
[1] See Note 3X for revisions to prior period results.