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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of risk management strategy related to hedge accounting [line items]      
Change in foreign exchange rates $ 4 $ 16 $ 17
Losses recognized in other comprehensive loss 126 (8) (141)
Total gains (losses) included in earnings (loss) before income taxes (694) (255) 28
Recurring fair value measurement | Level III      
Disclosure of risk management strategy related to hedge accounting [line items]      
Commodity risk management assets and liabilities (782) 159 582
Market price changes 80 (112)  
Change in foreign exchange rates 12 0  
Non-recurring fair value measurement | Level III      
Disclosure of risk management strategy related to hedge accounting [line items]      
Losses recognized in other comprehensive loss (594) (181)  
Total gains (losses) included in earnings (loss) before income taxes (389) (23)  
Unrealized gains (losses) included in earnings (loss) before income taxes relating to net assets held at year end (309) (135)  
Hedge | Recurring fair value measurement | Level III      
Disclosure of risk management strategy related to hedge accounting [line items]      
Commodity risk management assets and liabilities (347) 285 573
Market price changes (38) (107)  
Change in foreign exchange rates 17 0  
Hedge | Non-recurring fair value measurement | Level III      
Disclosure of risk management strategy related to hedge accounting [line items]      
Losses recognized in other comprehensive loss (594) (181)  
Total gains (losses) included in earnings (loss) before income taxes 38 107  
Unrealized gains (losses) included in earnings (loss) before income taxes relating to net assets held at year end 0 0  
Non-hedge | Recurring fair value measurement | Level III      
Disclosure of risk management strategy related to hedge accounting [line items]      
Commodity risk management assets and liabilities (435) (126) $ 9
Market price changes 118 (5)  
Change in foreign exchange rates (5) 0  
Non-hedge | Non-recurring fair value measurement | Level III      
Disclosure of risk management strategy related to hedge accounting [line items]      
Losses recognized in other comprehensive loss 0 0  
Total gains (losses) included in earnings (loss) before income taxes (427) (130)  
Unrealized gains (losses) included in earnings (loss) before income taxes relating to net assets held at year end (309) (135)  
Market price changes on existing contracts | Recurring fair value measurement | Level III      
Disclosure of risk management strategy related to hedge accounting [line items]      
Market price changes (909) (177)  
Market price changes on existing contracts | Hedge | Recurring fair value measurement | Level III      
Disclosure of risk management strategy related to hedge accounting [line items]      
Market price changes (611) (181)  
Market price changes on existing contracts | Non-hedge | Recurring fair value measurement | Level III      
Disclosure of risk management strategy related to hedge accounting [line items]      
Market price changes (298) 4  
Market price changes on new contracts | Recurring fair value measurement | Level III      
Disclosure of risk management strategy related to hedge accounting [line items]      
Market price changes (124) (134)  
Market price changes on new contracts | Hedge | Recurring fair value measurement | Level III      
Disclosure of risk management strategy related to hedge accounting [line items]      
Market price changes 0 0  
Market price changes on new contracts | Non-hedge | Recurring fair value measurement | Level III      
Disclosure of risk management strategy related to hedge accounting [line items]      
Market price changes $ (124) $ (134)