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Other Long-Term Liabilities - Asset Retirement Obligations (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of other provisions [line items]      
Asset retirement obligations settlement period 60 years    
Inflation rate 2.00% 2.00%  
Reconciliation Of Changes In Provision For Decommissioning Restoration And Rehabilitation Costs [Roll Forward]      
Balance – beginning of year $ 6,806 $ 5,861 $ 5,771
Balance – end of year 6,908 6,806 5,861
Less: current portion 495 249 184
Non-current asset retirement obligation 6,413 6,557 $ 5,677
North Sea      
Reconciliation Of Changes In Provision For Decommissioning Restoration And Rehabilitation Costs [Roll Forward]      
Balance – beginning of year 821    
Balance – end of year $ 1,011 $ 821  
Provision for decommissioning, restoration and rehabilitation costs      
Disclosure of other provisions [line items]      
Weighted average discount rate 5.60% 4.00% 3.70%
Reconciliation Of Changes In Provision For Decommissioning Restoration And Rehabilitation Costs [Roll Forward]      
Liabilities incurred $ 20 $ 5 $ 5
Liabilities acquired, net 11 76 13
Liabilities settled (449) (307) (249)
Asset retirement obligation accretion 281 185 205
Revision of cost, inflation and timing estimates 897 508 (134)
Impact of regulatory changes 982 1,208 0
Change in discount rates (1,698) (723) 253
Foreign exchange adjustments $ 58 $ (7) $ (3)