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Fair Value Measurement - Additional Information (Detail) - CAD ($)
$ in Millions
 3 Months Ended
Jan. 31, 2025
Oct. 31, 2024
Jan. 31, 2024
Held for Trading for Trading Purpose [member]      
Disclosure of detailed information about financial instruments [line items]      
Transfers out of Level 1 into Level 2 of fair value hierarchy, assets held at end of reporting period $ 457 $ 1,576  
Transfers out of Level 2 into Level 1 of fair value hierarchy, assets held at end of reporting period 292 575  
Obligations related to securities sold short [member]      
Disclosure of detailed information about financial instruments [line items]      
Transfers out of Level 1 into Level 2 of fair value hierarchy, assets held at end of reporting period 307 2,854  
Transfers out of Level 2 into Level 1 of fair value hierarchy, assets held at end of reporting period 132 429  
Level 3 of fair value hierarchy [member]      
Disclosure of detailed information about financial instruments [line items]      
Net gain (loss) net of hedges was realized for FVTPL assets and FVTPL liabilities $ 32 $ 25 $ (7)