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Long-term Debt and Capital Structure - Summary of Net Debt to Adjusted EBITDA (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2017
CAD ($)
Disclosure Of Objectives Policies And Processes For Managing Capital [Line Items]        
Short-Term Borrowings $ 121      
Long-Term Debt 7,441 $ 6,699    
Less: Cash and Cash Equivalents (378) (186) $ (781) $ (610)
Net Debt 7,184 6,513 8,383  
Net Earnings (Loss) (2,379) 2,194 (2,669)  
Add (Deduct):        
Interest Income (9) (12) (19)  
Foreign Exchange (Gain) Loss, Net (181) (404) 854  
Re-measurement of Contingent Payment (80) 164 50  
(Gain) Loss on Divestiture of Assets (81) (2) 795  
Other (Income) Loss, Net 40 9 13  
Rolling Twelve Month Basis        
Disclosure Of Objectives Policies And Processes For Managing Capital [Line Items]        
Short-Term Borrowings 121      
Current Portion of Long-Term Debt     682  
Long-Term Debt 7,441 6,699 8,482  
Less: Cash and Cash Equivalents (378) (186) (781)  
Net Debt 7,184 6,513 8,383  
Net Earnings (Loss) (2,379) 2,194 (2,669)  
Add (Deduct):        
Finance Costs 536 511 628  
Interest Income (9) (12) (19)  
Income Tax Expense (Recovery) (851) (797) (920)  
Depreciation, Depletion and Amortization 3,464 2,249 2,131  
Exploration Expense 91 82 2,123  
Unrealized (Gain) Loss on Risk Management 56 149 (1,249)  
Foreign Exchange (Gain) Loss, Net (181) (404) 854  
Re-measurement of Contingent Payment (80) 164 50  
(Gain) Loss on Discontinuance     (301)  
(Gain) Loss on Divestiture of Assets (81) (2) 795  
Other (Income) Loss, Net 40 9 13  
Adjusted EBITDA $ 606 $ 4,143 $ 1,436  
Net Debt to Adjusted EBITDA 11.9 1.6 5.8