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Fair Value Measurement - Additional Information (Detail) - CAD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2025
Jan. 31, 2025
Apr. 30, 2024
Apr. 30, 2025
Apr. 30, 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 $ 1,989 $ 457      
Transfers out of Level 2 into Level 1 of fair value hierarchy, assets held at end of reporting period 1,647 292      
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 1,764 307      
Transfers out of Level 2 into Level 1 of fair value hierarchy, assets held at end of reporting period 122 132      
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 FVO assets and FVO liabilities $ 20 $ 32 $ 7 $ 52 $ 0