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IFRS 7 - Disclosure - Market Risk - Summary of Incremental Risk Charge (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
Market Risk [line items]          
Total VaR (one-day measure) $ 10.6 $ 11.1 $ 15.0    
Interest rate risk [member]          
Market Risk [line items]          
Total VaR (one-day measure) 6.6 7.0 11.7    
Credit spread risk [member]          
Market Risk [line items]          
Total VaR (one-day measure) 1.4 1.3 2.4    
Equity risk [member]          
Market Risk [line items]          
Total VaR (one-day measure) 10.0 8.9 4.9    
Foreign exchange risk [member]          
Market Risk [line items]          
Total VaR (one-day measure) 1.1 1.3 2.7    
Commodity risk [member]          
Market Risk [line items]          
Total VaR (one-day measure) 2.3 5.9 3.1    
Diversification effect [member]          
Market Risk [line items]          
Total VaR (one-day measure) (10.8) (13.3) (9.8)    
High [Member]          
Market Risk [line items]          
Total VaR (one-day measure) 16.1        
High [Member] | Interest rate risk [member]          
Market Risk [line items]          
Total VaR (one-day measure) 10.2        
High [Member] | Credit spread risk [member]          
Market Risk [line items]          
Total VaR (one-day measure) 2.9        
High [Member] | Equity risk [member]          
Market Risk [line items]          
Total VaR (one-day measure) 15.9        
High [Member] | Foreign exchange risk [member]          
Market Risk [line items]          
Total VaR (one-day measure) 3.0        
High [Member] | Commodity risk [member]          
Market Risk [line items]          
Total VaR (one-day measure) 9.0        
Low [Member]          
Market Risk [line items]          
Total VaR (one-day measure) 10.6        
Low [Member] | Interest rate risk [member]          
Market Risk [line items]          
Total VaR (one-day measure) 4.1        
Low [Member] | Credit spread risk [member]          
Market Risk [line items]          
Total VaR (one-day measure) 1.2        
Low [Member] | Equity risk [member]          
Market Risk [line items]          
Total VaR (one-day measure) 8.4        
Low [Member] | Foreign exchange risk [member]          
Market Risk [line items]          
Total VaR (one-day measure) 0.5        
Low [Member] | Commodity risk [member]          
Market Risk [line items]          
Total VaR (one-day measure) 2.0        
Average risk [member]          
Market Risk [line items]          
Total VaR (one-day measure) 13.8 10.9 13.0 $ 12.3 $ 11.2
Average risk [member] | Interest rate risk [member]          
Market Risk [line items]          
Total VaR (one-day measure) 7.0 8.9 10.6 7.9 9.0
Average risk [member] | Credit spread risk [member]          
Market Risk [line items]          
Total VaR (one-day measure) 1.6 2.1 2.4 1.9 2.4
Average risk [member] | Equity risk [member]          
Market Risk [line items]          
Total VaR (one-day measure) 12.2 7.9 6.4 10.0 6.0
Average risk [member] | Foreign exchange risk [member]          
Market Risk [line items]          
Total VaR (one-day measure) 1.1 1.6 1.5 1.3 1.2
Average risk [member] | Commodity risk [member]          
Market Risk [line items]          
Total VaR (one-day measure) 5.0 2.8 2.4 3.9 2.5
Average risk [member] | Diversification effect [member]          
Market Risk [line items]          
Total VaR (one-day measure) $ (13.1) $ (12.4) $ (10.3) $ (12.7) $ (9.9)