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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of risk management strategy related to hedge accounting [line items]      
Change in foreign exchange rates $ (15) $ (1) $ (5)
Gains recognized in OCI (57) (138) (105)
Total gains included in earnings before income taxes (9) 136 271
Other      
Disclosure of risk management strategy related to hedge accounting [line items]      
Risk exposure associated with instruments sharing characteristic   34  
Commodity risk management      
Disclosure of risk management strategy related to hedge accounting [line items]      
Risk exposure associated with instruments sharing characteristic   728  
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 (1)  
Recurring fair value measurement | Level 2 of fair value hierarchy [member]      
Disclosure of risk management strategy related to hedge accounting [line items]      
Risk exposure associated with instruments sharing characteristic (19) (42)  
Recurring fair value measurement | Level III      
Disclosure of risk management strategy related to hedge accounting [line items]      
Risk exposure associated with instruments sharing characteristic 695 771 758
Market price changes (132) (67)  
Change in foreign exchange rates 72 (52)  
Transfers into Level 3 of fair value hierarchy, assets (4) 1  
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 (2) 34  
Non-recurring fair value measurement [member] | Level III      
Disclosure of risk management strategy related to hedge accounting [line items]      
Gains recognized in OCI 60 50  
Total gains included in earnings before income taxes 90 86  
Unrealized gains included in earnings before income taxes relating to met assets held (42) 19  
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 689 719 726
Market price changes (90) (57)  
Change in foreign exchange rates 67 (50)  
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 OCI 60 50  
Total gains included in earnings before income taxes 90 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 6 52 $ 32
Market price changes (42) (10)  
Change in foreign exchange rates 5 (2)  
Transfers into Level 3 of fair value hierarchy, assets (4) 1  
Non-Hedges | Non-recurring fair value measurement [member] | Level III      
Disclosure of risk management strategy related to hedge accounting [line items]      
Gains recognized in OCI 0 0  
Total gains included in earnings before income taxes 0 29  
Unrealized gains included in earnings before income taxes relating to met assets held (42) 19  
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 (16) 98  
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 (7) 100  
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 (9) (2)  
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 4 33  
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 $ 4 $ 33