Fair Value of Financial Instruments - Fair Value of Financial Liabilities Designated at Fair Value Through Profit or Loss and Changes in Fair Value (Detail) - Senior note liabilities [member] - CAD ($) $ in Millions		3 Months Ended
		Jan. 31, 2026	Oct. 31, 2025	Jan. 31, 2025
Disclosure of detailed information about financial instruments [line items]
Fair value	[1]	$ 47,740	$ 47,165	$ 39,594
Change in Fair value Gains/(Losses)	[1],[2]	(105)	(1,334)	486
Cumulative change in FV Gains/(Losses)	[1],[3]	$ 3,165	$ 3,270	$ 4,626

[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.