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Cumulative Preferred Stock (Summary of Cumulative Preferred Stock Authorized) (Details) - CAD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Class of Stock [Line Items]    
Issued and Outstanding 58,000,000 58,000,000
Net Proceeds $ 1,422 $ 1,422
Series A Preferred Stock    
Class of Stock [Line Items]    
Annual Dividend Per Share $ 0.5456  
Preferred Stock, Redemption Price Per Share $ 25.00  
Issued and Outstanding 4,866,814 4,866,814
Net Proceeds $ 119 $ 119
Series B Preferred Stock    
Class of Stock [Line Items]    
Preferred Stock, Redemption Price Per Share $ 25.00  
Issued and Outstanding 1,133,186 1,133,186
Net Proceeds $ 28 $ 28
Preferred Stock Dividend Payment Rate Variable Floating  
Series C Preferred Stock    
Class of Stock [Line Items]    
Annual Dividend Per Share $ 1.6085  
Preferred Stock, Redemption Price Per Share $ 25.00  
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 $ 1.1250  
Preferred Stock, Redemption Price Per Share $ 25.00  
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  
Preferred Stock, Redemption Price Per Share $ 25.00  
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 $ 1.5810  
Preferred Stock, Redemption Price Per Share $ 25.00  
Issued and Outstanding 12,000,000 12,000,000
Net Proceeds $ 295 $ 295
Series J Preferred Stock    
Class of Stock [Line Items]    
Annual Dividend Per Share $ 1.0625  
Preferred Stock, Redemption Price Per Share $ 25.00  
Issued and Outstanding 8,000,000 8,000,000
Net Proceeds $ 196 $ 196
Series L Preferred Stock    
Class of Stock [Line Items]    
Annual Dividend Per Share $ 1.1500  
Preferred Stock, Redemption Price Per Share $ 26.00  
Issued and Outstanding 9,000,000 9,000,000
Net Proceeds $ 222 $ 222