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Financial Instruments - Fair Value of the Commodity Risk Management Assets and Liabilities by Classification Level (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of risk management strategy related to hedge accounting [line items]      
Change in foreign exchange rates $ 5 $ (7) $ 4
Losses recognized in other comprehensive loss (23) 75 126
Total (losses) gains included in earnings before income taxes 270 51 (694)
Level III | Recurring fair value measurement      
Disclosure of risk management strategy related to hedge accounting [line items]      
Commodity risk management assets and liabilities (153) (147) (782)
Market price changes 23 525  
Change in foreign exchange rates (10) 16  
Transfers out of Level III(2) 0 205  
Level III | Recurring fair value measurement | Heartland acqusition      
Disclosure of risk management strategy related to hedge accounting [line items]      
Market price changes 3 0  
Level III | Recurring fair value measurement | Market price changes on existing contracts      
Disclosure of risk management strategy related to hedge accounting [line items]      
Market price changes (49) (129)  
Level III | Recurring fair value measurement | Market price changes on new contracts      
Disclosure of risk management strategy related to hedge accounting [line items]      
Market price changes 27 18  
Level III | Non-recurring fair value measurement      
Disclosure of risk management strategy related to hedge accounting [line items]      
Losses recognized in other comprehensive loss 0 (114)  
Total (losses) gains included in earnings before income taxes (32) (237)  
Unrealized (losses) gains included in earnings before income taxes relating to net assets (liabilities) held at year end (9) 288  
Level III | Hedge | Recurring fair value measurement      
Disclosure of risk management strategy related to hedge accounting [line items]      
Commodity risk management assets and liabilities 0 0 (347)
Market price changes 0 256  
Change in foreign exchange rates 0 9  
Transfers out of Level III(2) 0 205  
Level III | Hedge | Recurring fair value measurement | Heartland acqusition      
Disclosure of risk management strategy related to hedge accounting [line items]      
Market price changes 0 0  
Level III | Hedge | Recurring fair value measurement | Market price changes on existing contracts      
Disclosure of risk management strategy related to hedge accounting [line items]      
Market price changes 0 (123)  
Level III | Hedge | Recurring fair value measurement | Market price changes on new contracts      
Disclosure of risk management strategy related to hedge accounting [line items]      
Market price changes 0 0  
Level III | Hedge | Non-recurring fair value measurement      
Disclosure of risk management strategy related to hedge accounting [line items]      
Losses recognized in other comprehensive loss 0 (114)  
Total (losses) gains included in earnings before income taxes 0 (256)  
Unrealized (losses) gains included in earnings before income taxes relating to net assets (liabilities) held at year end 0 0  
Level III | Non-hedge | Recurring fair value measurement      
Disclosure of risk management strategy related to hedge accounting [line items]      
Commodity risk management assets and liabilities (153) (147) $ (435)
Market price changes 23 269  
Change in foreign exchange rates (10) 7  
Transfers out of Level III(2) 0 0  
Level III | Non-hedge | Recurring fair value measurement | Heartland acqusition      
Disclosure of risk management strategy related to hedge accounting [line items]      
Market price changes 3 0  
Level III | Non-hedge | Recurring fair value measurement | Market price changes on existing contracts      
Disclosure of risk management strategy related to hedge accounting [line items]      
Market price changes (49) (6)  
Level III | Non-hedge | Recurring fair value measurement | Market price changes on new contracts      
Disclosure of risk management strategy related to hedge accounting [line items]      
Market price changes 27 18  
Level III | Non-hedge | Non-recurring fair value measurement      
Disclosure of risk management strategy related to hedge accounting [line items]      
Losses recognized in other comprehensive loss 0 0  
Total (losses) gains included in earnings before income taxes (32) 19  
Unrealized (losses) gains included in earnings before income taxes relating to net assets (liabilities) held at year end $ (9) $ 288