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Other Long-Term Assets - Summary of Assets, Liabilities, Partners' Equity and Equity (Loss) Income (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of joint ventures [line items]      
Current assets $ 7,167 $ 7,057  
Current liabilities 7,435 8,651  
Partners' equity 39,832 38,175 $ 36,945
Revenue 40,835 49,530 32,854
Net earnings 8,233 10,937 7,664
Depletion, depreciation and amortization 6,413 7,353 5,724
Interest and other financing expense 636 549 $ 711
North West Redwater Partnership      
Disclosure of joint ventures [line items]      
Partners' equity (555) (551)  
Revenue $ 335 317  
Company's voting percent interest in joint venture 50.00%    
Percent of pro rata share of debt company has committed paying to joint venture, toll payer percent 25.00%    
North West Redwater Partnership      
Disclosure of joint ventures [line items]      
Current assets $ 349 257  
Non-current assets 10,508 10,729  
Current liabilities 1,054 849  
Non-current liabilities 10,913 11,239  
Partners' equity (1,110) (1,102)  
Revenue 1,527 1,267  
Net earnings (8) 22  
Depletion, depreciation and amortization 387 245  
Interest and other financing expense $ 500 $ 422