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Cumulative Preferred Stock (Authorized) (Details) - CAD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Aug. 15, 2020
Dec. 31, 2020
Dec. 31, 2019
Aug. 17, 2020
Class of Stock [Line Items]        
Issued and Outstanding   41,000,000 41,000,000  
Net Proceeds   $ 1,004 $ 1,004  
Series A Preferred Stock        
Class of Stock [Line Items]        
Annual Dividend Per Share $ 0.5456 $ 0.6388    
Preferred Stock, Redemption Price Per Share   $ 25    
Issued and Outstanding   4,866,814 3,864,636 3,864,636
Net Proceeds   $ 95 $ 95  
Series B Preferred Stock        
Class of Stock [Line Items]        
Preferred Stock, Redemption Price Per Share   $ 25    
Issued and Outstanding   1,133,186 2,135,364 2,135,364
Net Proceeds   $ 52 $ 52  
Preferred Stock Dividend Payment Rate Variable   Floating    
Series C Preferred Stock        
Class of Stock [Line Items]        
Annual Dividend Per Share 1.1802 $ 1.1802 $ 1.0505  
Preferred Stock, Redemption Price Per Share   $ 25    
Issued and Outstanding   10,000,000 10,000,000  
Net Proceeds   $ 245 $ 245  
Series E Preferred Stock        
Class of Stock [Line Items]        
Annual Dividend Per Share   $ 1.125    
Preferred Stock, Redemption Price Per Share   $ 25.75    
Issued and Outstanding   5,000,000 5,000,000  
Net Proceeds   $ 122 $ 122  
Series F Preferred Stock        
Class of Stock [Line Items]        
Annual Dividend Per Share $ 1.0505 $ 1.0625    
Preferred Stock, Redemption Price Per Share   $ 25    
Issued and Outstanding   8,000,000 8,000,000  
Net Proceeds   $ 195 $ 195  
Series H Preferred Stock        
Class of Stock [Line Items]        
Annual Dividend Per Share   $ 1.225    
Preferred Stock, Redemption Price Per Share   $ 25    
Issued and Outstanding   12,000,000 12,000,000  
Net Proceeds   $ 295 $ 295