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Financial Instruments Fair value of the commodity risk management assets and liabilities by classification level (Details) - CAD
CAD in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of risk management strategy related to hedge accounting [line items]      
Change in foreign exchange rates CAD (1) CAD (5) CAD 4
Gains recognized in OCI (138) 0 (250)
Total gains included in earnings before income taxes 136 0 517
Other      
Disclosure of risk management strategy related to hedge accounting [line items]      
Risk exposure associated with instruments sharing characteristic   176  
Commodity risk management      
Disclosure of risk management strategy related to hedge accounting [line items]      
Risk exposure associated with instruments sharing characteristic   744  
Recurring fair value measurement [member] | Level 1 of fair value hierarchy [member]      
Disclosure of risk management strategy related to hedge accounting [line items]      
Risk exposure associated with instruments sharing characteristic (1) 0  
Recurring fair value measurement [member] | 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 (42) (14)  
Recurring fair value measurement [member] | Level 3 of fair value hierarchy [member]      
Disclosure of risk management strategy related to hedge accounting [line items]      
Risk exposure associated with instruments sharing characteristic 771 758 542
Market price changes (67) 38  
Change in foreign exchange rates (52) (27)  
Transfers into Level 3 of fair value hierarchy, assets 1 0  
Recurring fair value measurement [member] | Level 3 of fair value hierarchy [member] | Other      
Disclosure of risk management strategy related to hedge accounting [line items]      
Risk exposure associated with instruments sharing characteristic 34 176  
Non-recurring fair value measurement [member] | Level 3 of fair value hierarchy [member]      
Disclosure of risk management strategy related to hedge accounting [line items]      
Gains recognized in OCI 50 136  
Total gains included in earnings before income taxes 86 92  
Unrealized gains included in earnings before income taxes relating to met assets held 19 130  
Fair value hedges [member] | Recurring fair value measurement [member] | Level 3 of fair value hierarchy [member]      
Disclosure of risk management strategy related to hedge accounting [line items]      
Risk exposure associated with instruments sharing characteristic 719 726 640
Market price changes (57) (50)  
Change in foreign exchange rates (50) (27)  
Transfers into Level 3 of fair value hierarchy, assets 0 0  
Fair value hedges [member] | Non-recurring fair value measurement [member] | Level 3 of fair value hierarchy [member]      
Disclosure of risk management strategy related to hedge accounting [line items]      
Gains recognized in OCI 50 136  
Total gains included in earnings before income taxes 57 50  
Unrealized gains included in earnings before income taxes relating to met assets held 0 0  
Non-Hedges [Member] | Recurring fair value measurement [member] | Level 3 of fair value hierarchy [member]      
Disclosure of risk management strategy related to hedge accounting [line items]      
Risk exposure associated with instruments sharing characteristic 52 32 CAD (98)
Market price changes (10) 88  
Change in foreign exchange rates (2) 0  
Transfers into Level 3 of fair value hierarchy, assets 1 0  
Non-Hedges [Member] | Non-recurring fair value measurement [member] | Level 3 of fair value hierarchy [member]      
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 29 42  
Unrealized gains included in earnings before income taxes relating to met assets held 19 130  
Derivative Instruments, Existing Contracts [Member] | Recurring fair value measurement [member] | Level 3 of fair value hierarchy [member]      
Disclosure of risk management strategy related to hedge accounting [line items]      
Market price changes 98 176  
Derivative Instruments, Existing Contracts [Member] | Fair value hedges [member] | Recurring fair value measurement [member] | Level 3 of fair value hierarchy [member]      
Disclosure of risk management strategy related to hedge accounting [line items]      
Market price changes 100 163  
Derivative Instruments, Existing Contracts [Member] | Non-Hedges [Member] | Recurring fair value measurement [member] | Level 3 of fair value hierarchy [member]      
Disclosure of risk management strategy related to hedge accounting [line items]      
Market price changes (2) 13  
Derivative Instruments, New Contracts [Member] | Recurring fair value measurement [member] | Level 3 of fair value hierarchy [member]      
Disclosure of risk management strategy related to hedge accounting [line items]      
Market price changes 33 29  
Derivative Instruments, New Contracts [Member] | Fair value hedges [member] | Recurring fair value measurement [member] | Level 3 of fair value hierarchy [member]      
Disclosure of risk management strategy related to hedge accounting [line items]      
Market price changes 0 0  
Derivative Instruments, New Contracts [Member] | Non-Hedges [Member] | Recurring fair value measurement [member] | Level 3 of fair value hierarchy [member]      
Disclosure of risk management strategy related to hedge accounting [line items]      
Market price changes CAD 33 CAD 29