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Debt and Capital Structure - Summary of Net Debt to Adjusted EBITDA (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of objectives, policies and processes for managing capital [line items]        
Short-Term Borrowings $ 79 $ 121    
Long-Term Debt 12,385 7,441    
Less: Cash and Cash Equivalents (2,873) (378) $ (186) $ (781)
Net debt 9,591 7,184 6,513  
Net Earnings (Loss) 587 (2,379) [1] 2,194 [1]  
Add (Deduct):        
Interest Income (23) (9) [1] (12) [1]  
Foreign Exchange (Gain) Loss, Net (174) (181) [1] (404) [1]  
Re-measurement of Contingent Payment (575) 80 [1] (164) [1]  
Other (Income) Loss, Net $ (309) $ 40 [1] $ 9 [1]  
Net Debt to Adjusted EBITDA 120.00% 1190.00% 160.00%  
Rolling Twelve Month Basis        
Disclosure of objectives, policies and processes for managing capital [line items]        
Short-Term Borrowings $ 79 $ 121 $ 0  
Long-Term Debt 12,385 7,441 6,699  
Less: Cash and Cash Equivalents (2,873) (378) (186)  
Net debt 9,591 7,184 6,513  
Net Earnings (Loss) 587 (2,379) 2,194  
Add (Deduct):        
Finance Costs 1,082 536 511  
Interest Income (23) (9) (12)  
Income Tax Expense (Recovery) 728 (851) (797)  
Depreciation, Depletion and Amortization 5,886 3,464 2,249  
E&E Write-Down 18 91 82  
Unrealized (Gain) Loss on Risk Management 2 56 149  
Foreign Exchange (Gain) Loss, Net (174) (181) (404)  
Re-measurement of Contingent Payment 575 (80) 164  
(Gain) Loss on Divestitures of Assets (229) (81) (2)  
Other (Income) Loss, Net (309) 40 9  
(Income) Loss From Equity-Accounted Affiliates (57) 0 0  
Adjusted EBITDA $ 8,086 $ 606 $ 4,143  
[1] See Note 3(w) for revisions to comparative results.