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Decommissioning and Other Provisions - Change in Decommissioning and Other Provision Balances (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Reconciliation of changes in other provisions [abstract]    
Balance $ 729 $ 827
Liabilities incurred 5 24
Liabilities settled (50) (47)
Accretion 48 49
Disposals   (5)
Revisions in estimated cash flows (89) 100
Revisions in discount rates 52 (225)
Reversals   (9)
Change in foreign exchange rates (6) 15
Balance 689 729
Decommissioning and restoration    
Reconciliation of changes in other provisions [abstract]    
Balance 688 793
Liabilities incurred 1 1
Liabilities settled (37) (35)
Accretion 47 49
Disposals   (5)
Revisions in estimated cash flows (89) 95
Revisions in discount rates 52 (225)
Reversals   0
Change in foreign exchange rates (6) 15
Balance 656 688
Other provisions    
Reconciliation of changes in other provisions [abstract]    
Balance 41 34
Liabilities incurred 4 23
Liabilities settled (13) (12)
Accretion 1 0
Disposals   0
Revisions in estimated cash flows 0 5
Revisions in discount rates 0 0
Reversals   (9)
Change in foreign exchange rates 0 0
Balance $ 33 $ 41