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Other Long-Term Liabilities - Asset Retirement Obligations (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
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 $ 6,908 $ 6,806 $ 5,861
Balance – end of year 7,690 6,908 6,806
Less: current portion 634 495 249
Non-current asset retirement obligation 7,056 6,413 6,557
Deferred income tax expense (recovery) (53) 139 (399)
Deferred income tax expense (recovery) (53) 139 $ (399)
North Sea      
Reconciliation Of Changes In Provision For Decommissioning Restoration And Rehabilitation Costs [Roll Forward]      
Balance – beginning of year 1,011    
Balance – end of year $ 1,441 $ 1,011  
Provision for decommissioning, restoration and rehabilitation costs      
Disclosure of other provisions [line items]      
Weighted average discount rate 5.20% 5.60% 4.00%
Reconciliation Of Changes In Provision For Decommissioning Restoration And Rehabilitation Costs [Roll Forward]      
Liabilities incurred $ 25 $ 20 $ 5
Liabilities acquired, net 0 11 76
Liabilities settled (509) (449) (307)
Asset retirement obligation accretion 366 281 185
Revision of cost, inflation and timing estimates 621 897 508
Impact of regulatory changes 0 982 1,208
Change in discount rates 314 (1,698) (723)
Foreign exchange adjustments $ (35) $ 58 $ (7)