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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of risk management strategy related to hedge accounting [line items]      
Change in foreign exchange rates $ 16 $ 17 $ (15)
Losses recognized in other comprehensive earnings (8) (141) (53)
Gains (losses) on cash flow hedges, before tax (255) 28 77
Other      
Disclosure of risk management strategy related to hedge accounting [line items]      
Risk exposure associated with instruments sharing characteristic   (12)  
Commodity risk management      
Disclosure of risk management strategy related to hedge accounting [line items]      
Risk exposure associated with instruments sharing characteristic   542  
Recurring fair value measurement | Level I      
Disclosure of risk management strategy related to hedge accounting [line items]      
Risk exposure associated with instruments sharing characteristic 12 (13)  
Recurring fair value measurement | Level II      
Disclosure of risk management strategy related to hedge accounting [line items]      
Risk exposure associated with instruments sharing characteristic 122 (27)  
Recurring fair value measurement | Level III      
Disclosure of risk management strategy related to hedge accounting [line items]      
Risk exposure associated with instruments sharing characteristic 159 582 686
Market price changes (112) (81)  
Change in foreign exchange rates 0 (15)  
Recurring fair value measurement | Level III | Other      
Disclosure of risk management strategy related to hedge accounting [line items]      
Risk exposure associated with instruments sharing characteristic 8 (12)  
Non-recurring fair value measurement [member] | Level III      
Disclosure of risk management strategy related to hedge accounting [line items]      
Losses recognized in other comprehensive earnings (181) (34)  
Gains (losses) on cash flow hedges, before tax (23) 82  
Unrealized gains included in earnings before income taxes relating to met assets held (135) 1  
Fair value hedges [member] | Recurring fair value measurement | Level III      
Disclosure of risk management strategy related to hedge accounting [line items]      
Risk exposure associated with instruments sharing characteristic 285 573 678
Market price changes (107) (71)  
Change in foreign exchange rates 0 (16)  
Fair value hedges [member] | Non-recurring fair value measurement [member] | Level III      
Disclosure of risk management strategy related to hedge accounting [line items]      
Losses recognized in other comprehensive earnings (181) (34)  
Gains (losses) on cash flow hedges, before tax 107 71  
Unrealized gains included in earnings before income taxes relating to met assets held 0 0  
Non-Hedges | Recurring fair value measurement | Level III      
Disclosure of risk management strategy related to hedge accounting [line items]      
Risk exposure associated with instruments sharing characteristic (126) 9 $ 8
Market price changes (5) (10)  
Change in foreign exchange rates 0 1  
Non-Hedges | Non-recurring fair value measurement [member] | Level III      
Disclosure of risk management strategy related to hedge accounting [line items]      
Losses recognized in other comprehensive earnings 0 0  
Gains (losses) on cash flow hedges, before tax (130) 11  
Unrealized gains included in earnings before income taxes relating to met assets held (135) 1  
Derivative Instruments, Existing Contracts [Member] | Recurring fair value measurement | Level III      
Disclosure of risk management strategy related to hedge accounting [line items]      
Market price changes (177) (15)  
Derivative Instruments, Existing Contracts [Member] | Fair value hedges [member] | Recurring fair value measurement | Level III      
Disclosure of risk management strategy related to hedge accounting [line items]      
Market price changes (181) (18)  
Derivative Instruments, Existing Contracts [Member] | Non-Hedges | Recurring fair value measurement | Level III      
Disclosure of risk management strategy related to hedge accounting [line items]      
Market price changes 4 3  
Derivative Instruments, New Contracts [Member] | Recurring fair value measurement | Level III      
Disclosure of risk management strategy related to hedge accounting [line items]      
Market price changes (134) 7  
Derivative Instruments, New Contracts [Member] | Fair value hedges [member] | Recurring fair value measurement | Level III      
Disclosure of risk management strategy related to hedge accounting [line items]      
Market price changes 0 0  
Derivative Instruments, New Contracts [Member] | Non-Hedges | Recurring fair value measurement | Level III      
Disclosure of risk management strategy related to hedge accounting [line items]      
Market price changes $ (134) $ 7