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Decommissioning and Other Provisions - Change in Decommissioning and Other Provision Balances (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Reconciliation of changes in other provisions [abstract]    
Balance $ 689 $ 729
Liabilities acquired (Note 4) 156  
Liabilities incurred 18 5
Liabilities settled (45) (50)
Accretion 50 48
Transfer to accounts payable (31)  
Transfer to Assets Held for Sale (1)  
Revisions in estimated cash flows 41 (89)
Revisions in discount rates 35 52
Change in foreign exchange rates 21 (6)
Balance 933 689
Decommissioning and restoration    
Reconciliation of changes in other provisions [abstract]    
Balance 656 688
Liabilities acquired (Note 4) 101  
Liabilities incurred 6 1
Liabilities settled (41) (37)
Accretion 50 47
Transfer to accounts payable 0  
Transfer to Assets Held for Sale (1)  
Revisions in estimated cash flows 21 (89)
Revisions in discount rates 35 52
Change in foreign exchange rates 21 (6)
Balance 848 656
Other provisions    
Reconciliation of changes in other provisions [abstract]    
Balance 33 41
Liabilities acquired (Note 4) 55  
Liabilities incurred 12 4
Liabilities settled (4) (13)
Accretion 0 1
Transfer to accounts payable (31)  
Transfer to Assets Held for Sale 0  
Revisions in estimated cash flows 20 0
Revisions in discount rates 0 0
Change in foreign exchange rates 0 0
Balance $ 85 $ 33