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Interest Income and Expense (Summary of Interest Income and Expense by Basis of Accounting Classification) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Disclosure Of Interest Income (Expense) [Line Items]    
Interest income $ 87,621 $ 93,389
Interest expense 54,559 62,917
Equity instruments measured at fair value through other comprehensive income [member]    
Disclosure Of Interest Income (Expense) [Line Items]    
Interest income 338 323
Financial instruments measure at amortized cost and FVOCI [member]    
Disclosure Of Interest Income (Expense) [Line Items]    
Interest income 79,001 84,324
Financial assets amortized cost [member]    
Disclosure Of Interest Income (Expense) [Line Items]    
Interest income 74,659 80,581
Interest expense 43,268 50,382
Financial assets measured at fair value through other comprehensive income, category [member]    
Disclosure Of Interest Income (Expense) [Line Items]    
Interest income 4,342 3,743
Financial Instruments Measured Or Designated At FairValue Through Profit Or Loss [Member]    
Disclosure Of Interest Income (Expense) [Line Items]    
Interest income 8,282 8,742
Interest expense $ 11,291 $ 12,535