Derecognition of Financial Assets - Summary of Carrying Amount of Transferred Other Financial Assets Do Not Qualify for Derecognition and Associated Liabilities (Detail) - Other Financial Assets [Member] - CAD ($) $ in Millions		Jan. 31, 2025	Oct. 31, 2024
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]
Carrying value of assets	[1]	$ 234,994	$ 232,811
Carrying value of associated liabilities	[1],[2]	182,259	190,449
Repurchase agreement [member]
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]
Carrying value of assets	[1],[3]	163,805	174,334
Securities lending [member]
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]
Carrying value of assets	[1]	$ 71,189	$ 58,477

[1] The fair value of transferred assets is $234,994 (October 31, 2024 – $232,811) and the fair value of the associated liabilities is $182,259 (October 31, 2024 – $190,449) for a net position of $52,735 (October 31, 2024 – $42,362).

[2] Liabilities for securities lending arrangements only include amounts related to cash collateral received. In most cases, securities are received as collateral.

[3] Does not include over-collateralization of assets pledged.