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Supplemental Disclosure of Cash Flow Information - Liabilities Arising From Financing Activities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Liabilities arising from financing activities, beginning balance $ 20,262 $ 22,319
Changes in liabilities arising from financing activities [abstract]    
Issue of long-term debt 1,025 (2,831)
Payment of lease liabilities (237)  
Increase through new leases, liabilities arising from financing activities 527  
Non-cash changes (524) 774
Liabilities arising from financing activities, ending balance 22,592 20,262
Long-term debt    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Liabilities arising from financing activities, beginning balance 20,623 22,458
Changes in liabilities arising from financing activities [abstract]    
Issue of long-term debt 1,025 (2,831)
Non-cash changes (666) 996
Liabilities arising from financing activities, ending balance 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 (361) (139)
Changes in liabilities arising from financing activities [abstract]    
Issue of long-term debt 0 0
Non-cash changes 162 (222)
Liabilities arising from financing activities, ending balance (199) (361)
Lease liabilities    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Liabilities arising from financing activities, beginning balance 0  
Changes in liabilities arising from financing activities [abstract]    
Payment of lease liabilities (237)  
Increase through new leases, liabilities arising from financing activities 527  
Non-cash changes (20)  
Liabilities arising from financing activities, ending balance $ 1,809 $ 0