v3.26.1
IFRS 7 Disclosure (Market Risk - Portfolio Market Risk Measures) (Details) - CAD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2026
Jan. 31, 2026
Apr. 30, 2025
Apr. 30, 2026
Apr. 30, 2025
Market Risk [Line Items]          
Total VaR (one-day measure) $ 36.0        
Interest rate risk [member]          
Market Risk [Line Items]          
Total VaR (one-day measure) 11.7        
Credit risk [member]          
Market Risk [Line Items]          
Total VaR (one-day measure) 18.0        
Equity price risk [member]          
Market Risk [Line Items]          
Total VaR (one-day measure) 27.9        
Currency risk [member]          
Market Risk [Line Items]          
Total VaR (one-day measure) 2.1        
Commodity price risk [member]          
Market Risk [Line Items]          
Total VaR (one-day measure) 25.1        
Idiosyncratic debt specific risk [member]          
Market Risk [Line Items]          
Total VaR (one-day measure) 16.2        
Risk diversification effect [member]          
Market Risk [Line Items]          
Total VaR (one-day measure) (65.0)        
Average risk [member]          
Market Risk [Line Items]          
Total VaR (one-day measure) 40.1 $ 42.2 $ 35.9 $ 41.1 $ 32.1
Average risk [member] | Interest rate risk [member]          
Market Risk [Line Items]          
Total VaR (one-day measure) 15.3 12.6 12.8 14.0 12.6
Average risk [member] | Credit risk [member]          
Market Risk [Line Items]          
Total VaR (one-day measure) 19.6 14.8 20.1 17.2 19.9
Average risk [member] | Equity price risk [member]          
Market Risk [Line Items]          
Total VaR (one-day measure) 17.6 16.1 9.6 16.8 8.9
Average risk [member] | Currency risk [member]          
Market Risk [Line Items]          
Total VaR (one-day measure) 4.1 5.1 3.8 4.6 3.9
Average risk [member] | Commodity price risk [member]          
Market Risk [Line Items]          
Total VaR (one-day measure) 35.5 37.1 23.1 36.3 14.5
Average risk [member] | Idiosyncratic debt specific risk [member]          
Market Risk [Line Items]          
Total VaR (one-day measure) 17.1 15.3 23.4 16.2 21.5
Average risk [member] | Risk diversification effect [member]          
Market Risk [Line Items]          
Total VaR (one-day measure) (69.1) $ (58.8) $ (56.9) $ (64.0) $ (49.2)
High risk [member]          
Market Risk [Line Items]          
Total VaR (one-day measure) 54.1        
High risk [member] | Interest rate risk [member]          
Market Risk [Line Items]          
Total VaR (one-day measure) 23.5        
High risk [member] | Credit risk [member]          
Market Risk [Line Items]          
Total VaR (one-day measure) 26.0        
High risk [member] | Equity price risk [member]          
Market Risk [Line Items]          
Total VaR (one-day measure) 36.9        
High risk [member] | Currency risk [member]          
Market Risk [Line Items]          
Total VaR (one-day measure) 8.2        
High risk [member] | Commodity price risk [member]          
Market Risk [Line Items]          
Total VaR (one-day measure) 49.6        
High risk [member] | Idiosyncratic debt specific risk [member]          
Market Risk [Line Items]          
Total VaR (one-day measure) 20.0        
Low risk [member]          
Market Risk [Line Items]          
Total VaR (one-day measure) 32.0        
Low risk [member] | Interest rate risk [member]          
Market Risk [Line Items]          
Total VaR (one-day measure) 9.8        
Low risk [member] | Credit risk [member]          
Market Risk [Line Items]          
Total VaR (one-day measure) 13.5        
Low risk [member] | Equity price risk [member]          
Market Risk [Line Items]          
Total VaR (one-day measure) 7.3        
Low risk [member] | Currency risk [member]          
Market Risk [Line Items]          
Total VaR (one-day measure) 1.3        
Low risk [member] | Commodity price risk [member]          
Market Risk [Line Items]          
Total VaR (one-day measure) 25.1        
Low risk [member] | Idiosyncratic debt specific risk [member]          
Market Risk [Line Items]          
Total VaR (one-day measure) $ 14.3