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Income Taxes - Deferred Income Tax Balances (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax expense (recovery) $ 440 $ 249  
Net deferred income tax liability 11,917 11,433 $ 11,180
Property, plant and equipment      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax expense (recovery) 484 157  
Deferred income tax liability 14,705 14,252  
Decommissioning and Restoration      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax expense (recovery) 46 19  
Deferred income tax assets (1,854) (1,910)  
Employee retirement benefit plans      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax expense (recovery) 15 (5)  
Deferred income tax assets (585) (639)  
Tax loss carryforwards      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax expense (recovery) (63)    
Deferred income tax assets (172) (109)  
Other deferred income tax (assets) liabilities      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax expense (recovery) (42) 78  
Deferred income tax assets $ (177) $ (161)