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Other Long-Term Assets - Schedule of Assets, Liabilities, Partners' Equity and Equity (Loss) Income (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of joint ventures [line items]      
Current assets $ 7,405 $ 7,167  
Current liabilities 9,631 7,435  
Partners' equity 39,468 39,832 $ 38,175
Revenue 41,509 40,835 49,530
Net (loss) income 6,106 8,233 10,937
Depletion, depreciation and amortization 6,681 6,413 7,353
Interest and other financing expense $ 592 636 $ 549
North West Redwater Partnership      
Disclosure of joint ventures [line items]      
Partners’ equity at Company's 50% interest 50.00%    
Partners' equity $ (509) (555)  
Revenue $ 325 335  
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 $ 535 349  
Non-current assets 10,286 10,508  
Current liabilities 2,082 1,054  
Non-current liabilities 9,757 10,913  
Partners' equity (1,018) (1,110)  
Revenue 1,490 1,527  
Net (loss) income 92 (8)  
Depletion, depreciation and amortization 346 387  
Interest and other financing expense $ 502 $ 500