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Income Taxes - Summary of Movements in Deferred Tax Assets and Liabilities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax expense (recovery) $ 399 $ (181) $ (894)
Property, plant and equipment and exploration and evaluation assets      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax expense (recovery) 184 (158) (775)
Lease assets      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax expense (recovery) (30) (11) 414
Unrealized foreign exchange on long-term debt      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax expense (recovery) 34 29 55
Unrealized risk management activities      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax expense (recovery) 19 (8) (14)
Asset retirement obligations      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax expense (recovery) (213) (13) (317)
Lease liabilities      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax expense (recovery) 25 6 (418)
Share-based compensation      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax expense (recovery) (10) 4 (11)
Loss carryforwards      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax expense (recovery) 202 (182) 170
Investments      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax expense (recovery) 21 (22) (10)
Investment in North West Redwater Partnership      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax expense (recovery) 83 174 179
Deferred PRT      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax expense (recovery) 0 0 1
Other      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred income tax expense (recovery) $ 84 $ 0 $ (168)