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Fair Value Measurements (Summary of Quantitative Information about Fair Value Measurements Using Significant Unobservable Inputs (Level 3 Instruments)) (Parenthetical) (Details) - CAD ($)
$ in Billions
Oct. 31, 2025
Oct. 31, 2024
Other equity securities [member] | Federal reserve stock and federal home loan bank stock [member]    
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurement Of Assets And Liabilities [Line Items]    
Securities not subject to sensitivity analysis $ 1.7 $ 3.2