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Preferred Shares - Issued and Outstanding (Details) - CAD ($)
shares in Millions, $ in Millions
Dec. 31, 2024
Sep. 30, 2024
Dec. 31, 2023
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 6.6 10.0
Number of shares issued (in shares) 10.0   10.0
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