v3.26.1
Securities - Summary of Allowance for Credit Losses - Securities at FVOCI (Detail) - Debt securities at fair value through other comprehensive income [member] - CAD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2026
Apr. 30, 2025
Apr. 30, 2026
Apr. 30, 2025
Disclosure of financial assets [line items]        
Balance at beginning of period $ (38) $ (38) $ (40) $ (35)
Provision for credit losses        
Purchases 2 2 4 4
Sales and maturities (1) (1) (2) (2)
Changes in risk, parameters and exposures (2) (3) (4) (8)
Exchange rate and other 1 5 4 6
Balance at end of period (38) (35) (38) (35)
Performing Stage one [member]        
Disclosure of financial assets [line items]        
Balance at beginning of period 5 4 5 6
Provision for credit losses        
Purchases 2 2 4 4
Sales and maturities (1) (1) (2) (2)
Changes in risk, parameters and exposures   (1) (1) (4)
Exchange rate and other (1) 1 (1) 1
Balance at end of period 5 5 5 5
Impaired Stage three [member]        
Disclosure of financial assets [line items]        
Balance at beginning of period (43) (42) (45) (41)
Provision for credit losses        
Changes in risk, parameters and exposures (2) (2) (3) (4)
Exchange rate and other 2 4 5 5
Balance at end of period $ (43) $ (40) $ (43) $ (40)