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Decommissioning and Other Provisions - Change in Decommissioning and Other Provision Balances (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of changes in other provisions [abstract]    
Balance $ 456 $ 470
Liabilities incurred 14 22
Liabilities settled (43) (41)
Accretion (23) 24
Acquisition of liabilities 19 8
Revisions in estimated cash flows 103 5
Revisions in discount rates 16 (37)
Reversals (1) (5)
Change in foreign exchange rates (7) 10
Liabilities disposed (32)  
Balance 546 456
Decommissioning and restoration    
Reconciliation of changes in other provisions [abstract]    
Balance 407 437
Liabilities incurred 7 5
Liabilities settled (34) (31)
Accretion (23) 24
Acquisition of liabilities 16 0
Revisions in estimated cash flows 96 2
Revisions in discount rates 16 (37)
Reversals 0 0
Change in foreign exchange rates (7) 7
Liabilities disposed (23)  
Balance 501 407
Other    
Reconciliation of changes in other provisions [abstract]    
Balance 49 33
Liabilities incurred 7 17
Liabilities settled (9) (10)
Accretion 0 0
Acquisition of liabilities 3 8
Revisions in estimated cash flows 7 3
Revisions in discount rates 0 0
Reversals (1) (5)
Change in foreign exchange rates 0 3
Liabilities disposed (9)  
Balance $ 45 $ 49