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Securities (Summary of Equity Securities Net Realized Gains (Losses) Explanatory) (Details) - CAD ($)
$ in Millions
12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Equity Securities [member]    
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]    
Fair value $ 273 $ 643
Cumulative realized gain/(loss) 13 121
FHLB Stock [Member]    
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]    
Fair value 1,483 187
Cumulative realized gain/(loss) $ 0 $ 0