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Preference Shares - Issued and Outstanding (Details) - CAD ($)
shares in Thousands, $ in Millions
Dec. 31, 2024
Dec. 31, 2023
Class of Stock [Line Items]    
Preferred stock issued (shares) 66,200 66,200
Preferred stock outstanding (shares) 66,200 66,200
Preferred stock issued $ 1,623 $ 1,623
Preferred stock outstanding $ 1,623 $ 1,623
Series F    
Class of Stock [Line Items]    
Preferred stock issued (shares) 5,000 5,000
Preferred stock outstanding (shares) 5,000 5,000
Preferred stock issued $ 122 $ 122
Preferred stock outstanding $ 122 $ 122
Series G    
Class of Stock [Line Items]    
Preferred stock issued (shares) 9,200 9,200
Preferred stock outstanding (shares) 9,200 9,200
Preferred stock issued $ 225 $ 225
Preferred stock outstanding $ 225 $ 225
Series H    
Class of Stock [Line Items]    
Preferred stock issued (shares) 7,665 7,665
Preferred stock outstanding (shares) 7,665 7,665
Preferred stock issued $ 188 $ 188
Preferred stock outstanding $ 188 $ 188
Series I    
Class of Stock [Line Items]    
Preferred stock issued (shares) 2,335 2,335
Preferred stock outstanding (shares) 2,335 2,335
Preferred stock issued $ 57 $ 57
Preferred stock outstanding $ 57 $ 57
Series J    
Class of Stock [Line Items]    
Preferred stock issued (shares) 8,000 8,000
Preferred stock outstanding (shares) 8,000 8,000
Preferred stock issued $ 196 $ 196
Preferred stock outstanding $ 196 $ 196
Series K    
Class of Stock [Line Items]    
Preferred stock issued (shares) 10,000 10,000
Preferred stock outstanding (shares) 10,000 10,000
Preferred stock issued $ 244 $ 244
Preferred stock outstanding $ 244 $ 244
Series M    
Class of Stock [Line Items]    
Preferred stock issued (shares) 24,000 24,000
Preferred stock outstanding (shares) 24,000 24,000
Preferred stock issued $ 591 $ 591
Preferred stock outstanding $ 591 $ 591