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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of risk management strategy related to hedge accounting [line items]      
Change in foreign exchange rates $ 17 $ (15) $ (15)
Gains (losses) recognized in other comprehensive income (141) (53) (57)
Gains (losses) on cash flow hedges, before tax 28 77 (9)
Other      
Disclosure of risk management strategy related to hedge accounting [line items]      
Risk exposure associated with instruments sharing characteristic   4  
Commodity risk management      
Disclosure of risk management strategy related to hedge accounting [line items]      
Risk exposure associated with instruments sharing characteristic   692  
Recurring fair value measurement | Level I      
Disclosure of risk management strategy related to hedge accounting [line items]      
Risk exposure associated with instruments sharing characteristic (13) (3)  
Recurring fair value measurement | Level II      
Disclosure of risk management strategy related to hedge accounting [line items]      
Risk exposure associated with instruments sharing characteristic (27) 9  
Recurring fair value measurement | Level III      
Disclosure of risk management strategy related to hedge accounting [line items]      
Risk exposure associated with instruments sharing characteristic 582 686 695
Market price changes (81) (76)  
Change in foreign exchange rates (15) (32)  
Transfers into Level 3 of fair value hierarchy, assets 0 0  
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 (12) 4  
Non-recurring fair value measurement [member] | Level III      
Disclosure of risk management strategy related to hedge accounting [line items]      
Gains (losses) recognized in other comprehensive income (34) 46  
Gains (losses) on cash flow hedges, before tax 82 78  
Unrealized gains included in earnings before income taxes relating to met assets held 1 2  
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 573 678 689
Market price changes (71) (57)  
Change in foreign exchange rates (16) (31)  
Transfers into Level 3 of fair value hierarchy, assets 0 0  
Fair value hedges [member] | Non-recurring fair value measurement [member] | Level III      
Disclosure of risk management strategy related to hedge accounting [line items]      
Gains (losses) recognized in other comprehensive income (34) 46  
Gains (losses) on cash flow hedges, before tax 71 57  
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 9 8 $ 6
Market price changes (10) (19)  
Change in foreign exchange rates 1 (1)  
Transfers into Level 3 of fair value hierarchy, assets 0 0  
Non-Hedges | Non-recurring fair value measurement [member] | Level III      
Disclosure of risk management strategy related to hedge accounting [line items]      
Gains (losses) recognized in other comprehensive income 0 0  
Gains (losses) on cash flow hedges, before tax 11 21  
Unrealized gains included in earnings before income taxes relating to met assets held 1 2  
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 (15) 85  
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 (18) 77  
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 3 8  
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 7 14  
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 $ 7 $ 14