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Cumulative Preferred Stock (Details) - CAD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2013
Class of Stock [Line Items]      
Preferred Stock, Shares Outstanding 41,000,000 29,000,000  
Proceeds From Issuance Of Preferred Stock And Preference Stock Net $ 295    
Series A Preferred Stock [Member]      
Class of Stock [Line Items]      
Preferred Stock, Dividends Per Share, Declared $ 0.6388    
Preferred Stock, Redemption Price Per Share $ 25    
Preferred stock, dividend rate, percentage 4.40%    
Preferred Stock, Shares Outstanding 3,864,636 3,864,636  
Proceeds From Issuance Of Preferred Stock And Preference Stock Net $ 95 $ 95  
Series B Preferred Stock [Member]      
Class of Stock [Line Items]      
Preferred Stock, Redemption Price Per Share $ 25    
Preferred stock, dividend rate, percentage 2.393%    
Preferred Stock, Shares Outstanding 2,135,364 2,135,364  
Proceeds From Issuance Of Preferred Stock And Preference Stock Net $ 52 $ 52  
Series C Preferred Stock [Member]      
Class of Stock [Line Items]      
Preferred Stock, Dividends Per Share, Declared $ 1.1802   $ 1.025
Preferred Stock, Redemption Price Per Share $ 25    
Preferred stock, dividend rate, percentage 4.10%    
Preferred Stock, Shares Outstanding 10,000,000 10,000,000  
Proceeds From Issuance Of Preferred Stock And Preference Stock Net $ 245 $ 245  
Series E Preferred Stock [Member]      
Class of Stock [Line Items]      
Preferred Stock, Dividends Per Share, Declared $ 1.125    
Preferred Stock, Redemption Price Per Share $ 26    
Preferred stock, dividend rate, percentage 4.50%    
Preferred Stock, Shares Outstanding 5,000,000 5,000,000  
Proceeds From Issuance Of Preferred Stock And Preference Stock Net $ 122 $ 122  
Series F Preferred Stock [Member]      
Class of Stock [Line Items]      
Preferred Stock, Dividends Per Share, Declared $ 1.0625    
Preferred Stock, Redemption Price Per Share $ 25    
Preferred stock, dividend rate, percentage 4.25%    
Preferred Stock, Shares Outstanding 8,000,000 8,000,000  
Proceeds From Issuance Of Preferred Stock And Preference Stock Net $ 195 $ 195  
Series H Preferred Stock [Member}      
Class of Stock [Line Items]      
Preferred Stock, Dividends Per Share, Declared $ 1.225    
Preferred Stock, Redemption Price Per Share $ 25    
Preferred stock, dividend rate, percentage 4.90%    
Preferred Stock, Shares Outstanding 12,000,000    
Proceeds From Issuance Of Preferred Stock And Preference Stock Net $ 295 $ 0