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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
Jan. 31, 2025
Oct. 31, 2024
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items]    
Deposits designated at FVTPL $ 39,610 $ 39,008
Derivative instrument liabilities 587 521
Other liabilities designated at FVTPL 3 19
Other financial liabilities measured at fair value $ 163 $ 158