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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of risk management strategy related to hedge accounting [line items]      
Foreign exchange gain (loss) $ (15) $ (15) $ (1)
Gains recognized in other comprehensive income (53) (57) (138)
Gains (losses) on cash flow hedges, before tax 77 (9) 136
Other      
Disclosure of risk management strategy related to hedge accounting [line items]      
Risk exposure associated with instruments sharing characteristic   (2)  
Commodity risk management      
Disclosure of risk management strategy related to hedge accounting [line items]      
Risk exposure associated with instruments sharing characteristic   679  
Recurring fair value measurement | Level I      
Disclosure of risk management strategy related to hedge accounting [line items]      
Risk exposure associated with instruments sharing characteristic (3) 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 9 (19)  
Recurring fair value measurement | Level III      
Disclosure of risk management strategy related to hedge accounting [line items]      
Risk exposure associated with instruments sharing characteristic 686 695 771
Market price changes (76) (132)  
Foreign exchange gain (loss) (32) 72  
Transfers into Level 3 of fair value hierarchy, assets 0 (4)  
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 4 (2)  
Non-recurring fair value measurement [member] | Level III      
Disclosure of risk management strategy related to hedge accounting [line items]      
Gains recognized in other comprehensive income 46 60  
Gains (losses) on cash flow hedges, before tax 78 90  
Unrealized gains included in earnings before income taxes relating to met assets held 2 (42)  
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 678 689 719
Market price changes (57) (90)  
Foreign exchange gain (loss) (31) 67  
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 recognized in other comprehensive income 46 60  
Gains (losses) on cash flow hedges, before tax 57 90  
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 8 6 $ 52
Market price changes (19) (42)  
Foreign exchange gain (loss) (1) 5  
Transfers into Level 3 of fair value hierarchy, assets 0 (4)  
Non-Hedges | Non-recurring fair value measurement [member] | Level III      
Disclosure of risk management strategy related to hedge accounting [line items]      
Gains recognized in other comprehensive income 0 0  
Gains (losses) on cash flow hedges, before tax 21 0  
Unrealized gains included in earnings before income taxes relating to met assets held 2 (42)  
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 85 (16)  
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 77 (7)  
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 8 (9)  
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 14 4  
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 $ 14 $ 4