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Supplemental Disclosure of Cash Flow Information - Liabilities Arising From Financing Activities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities, beginning balance $ 22,592 $ 21,801  
Changes in liabilities arising from financing activities [abstract]      
Issue (repayment) of long-term debt 719 1,025  
Settlement of Painted Pony long-term debt 397 0 $ 0
Proceeds on settlement of cross currency swaps 166 0 0
Payment of lease liabilities (225) (237)  
Lease additions 148 527  
Non-cash changes (285) (524)  
Liabilities arising from financing activities, ending balance 23,115 22,592 21,801
Long-term debt      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities, beginning balance 20,982 20,623  
Changes in liabilities arising from financing activities [abstract]      
Issue (repayment) of long-term debt 719 1,025  
Non-cash changes (248) (666)  
Liabilities arising from financing activities, ending balance 21,453 20,982 20,623
Cash flow hedges on US dollar debt securities      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities, beginning balance (199) (361)  
Changes in liabilities arising from financing activities [abstract]      
Issue (repayment) of long-term debt 0    
Proceeds on settlement of cross currency swaps 166    
Non-cash changes 5 162  
Liabilities arising from financing activities, ending balance (28) (199) (361)
Lease liabilities      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities, beginning balance 1,809 1,539  
Changes in liabilities arising from financing activities [abstract]      
Payment of lease liabilities (225) (237)  
Lease additions 148 527  
Non-cash changes (42) (20)  
Liabilities arising from financing activities, ending balance 1,690 $ 1,809 $ 1,539
Painted Pony Energy Ltd      
Changes in liabilities arising from financing activities [abstract]      
Settlement of Painted Pony long-term debt (397)    
Assumption of Painted Pony long-term debt 397    
Painted Pony Energy Ltd | Long-term debt      
Changes in liabilities arising from financing activities [abstract]      
Settlement of Painted Pony long-term debt (397)    
Assumption of Painted Pony long-term debt $ 397