Financial Instruments Designated at Fair Value Through Profit or Loss - Fair Value Of Financial Assets And Liabilities Designated At Fair Value Through Profit Or Loss And Their Changes In Fair Value (Detail) - Senior note liabilities [member] - CAD ($) $ in Millions		12 Months Ended
		Oct. 31, 2025	Oct. 31, 2024
Disclosure of detailed information about financial instruments [line items]
Fair value	[1]	$ 47,165	$ 36,341
Change in Fair value Gains/(losses)	[1],[2]	(870)	(4,515)
Cumulative change in FV Gains/(losses)	[1],[3]	$ 3,270	$ 4,140

[1] Changes in fair value attributable to changes in the Bank’s own credit risk are recorded in other comprehensive income. Other changes in fair value are recorded in non-interest income – trading revenues. The offsetting fair value changes from associated derivatives is also recorded in non-interest income – trading revenues.

[2] Change in the difference between the contractual maturity amount and the carrying value.

[3] The cumulative change in fair value is measured from the instrument’s date of initial recognition.