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Financial Instruments And Risk Management - Fair Value Hierarchy (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value    
Balance $ 60 $ (105)
Transfers of financial liabilities from level 1 to 2 0  
Transfers of financial liabilities from level 2 to 1 0  
Trade receivables    
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value    
Financial assets, at fair value 215 74
Accounts Payable    
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value    
Financial liabilities, at fair value (155) (179)
Level 1    
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value    
Balance 20 (53)
Level 1 | Trade receivables    
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value    
Financial assets, at fair value 63 21
Level 1 | Accounts Payable    
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value    
Financial liabilities, at fair value (43) (74)
Level 2    
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value    
Balance 40 (52)
Level 2 | Trade receivables    
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value    
Financial assets, at fair value 152 53
Level 2 | Accounts Payable    
Derivative financial instrument assets and liabilities and assets available for sale measured at fair value    
Financial liabilities, at fair value $ (112) $ (105)