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Preferred Shares - Issued and Outstanding (Details) - CAD ($)
shares in Millions, $ in Millions
Dec. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Preferred Shares      
Disclosure of classes of share capital [line items]      
Number of shares outstanding (in shares) 38.6 38.6  
Number of shares issued (in shares) 38.6 38.6  
Amount $ 942 $ 942  
Series A      
Disclosure of classes of share capital [line items]      
Number of shares outstanding (in shares) 9.6 9.6  
Number of shares issued (in shares) 9.6 9.6  
Amount $ 235 $ 235  
Series B      
Disclosure of classes of share capital [line items]      
Number of shares outstanding (in shares) 2.4 2.4  
Number of shares issued (in shares) 2.4 2.4  
Amount $ 58 $ 58  
Series C      
Disclosure of classes of share capital [line items]      
Number of shares outstanding (in shares) 10.0 10.0 11.0
Number of shares issued (in shares) 10.0 10.0 11.0
Amount $ 243 $ 243  
Series D      
Disclosure of classes of share capital [line items]      
Number of shares outstanding (in shares) 1.0 1.0  
Number of shares issued (in shares) 1.0 1.0  
Amount $ 26 $ 26  
Series E      
Disclosure of classes of share capital [line items]      
Number of shares outstanding (in shares) 9.0 9.0  
Number of shares issued (in shares) 9.0 9.0  
Amount $ 219 $ 219  
Series G      
Disclosure of classes of share capital [line items]      
Number of shares outstanding (in shares) 6.6 6.6  
Number of shares issued (in shares) 6.6 6.6  
Amount $ 161 $ 161