Trading Assets - Summary of Geographic Breakdown Trading Loans (Parenthetical) (Detail) - CAD ($) $ in Millions	Oct. 31, 2021	Oct. 31, 2020
Disclosure of financial assets [line items]
Trading loans	$ 8,113	$ 8,352
Hedge To Loan-based Credit Total Return Swaps [member]
Disclosure of financial assets [line items]
Trading loans	$ 5,203	$ 5,396

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