Derecognition of Financial Assets - Summary of Carrying Amount of Transferred Other Financial Assets Do Not Qualify for Derecognition and Associated Liabilities (Parenthetical) (Detail) - Other Financial Assets [Member] - CAD ($) $ in Millions	Apr. 30, 2022	Jan. 31, 2022	Oct. 31, 2021
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]
Fair value of transferred assets	$ 166,119	$ 160,384	$ 159,589
Fair value of the associated liabilities	131,978	122,878	123,469
Net position	$ 34,141	$ 37,506	$ 36,120