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Fair Value Measurement - Summary of Financial Instruments Carried On Consolidated Balance Sheet at Fair Value (Parenthetical) (Detail) - At fair value [member] - CAD ($) $ in Millions	Jul. 31, 2025	Oct. 31, 2024
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items]
Deposits designated at FVTPL	$ 41,997	$ 39,008
Derivative instrument liabilities	261	521
Other liabilities designated at FVTPL	21	19
Other financial liabilities measured at fair value	$ 175	$ 158