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 9 Months Ended
Jul. 31, 2026
Jul. 31, 2025
Jul. 31, 2026
Jul. 31, 2025
Disclosure of financial assets [line items]        
Balance at beginning of period $ (38) $ (35) $ (40) $ (35)
Provision for credit losses        
Purchases 2 1 6 5
Sales and maturities (1) (1) (3) (3)
Changes in risk, parameters and exposures (2) (4) (6) (12)
Exchange rate and other 1   5 6
Balance at end of period (38) (39) (38) (39)
Performing Stage one [member]        
Disclosure of financial assets [line items]        
Balance at beginning of period 5 5 5 6
Provision for credit losses        
Purchases 2 1 6 5
Sales and maturities (1) (1) (3) (3)
Changes in risk, parameters and exposures (1)   (2) (4)
Exchange rate and other 2 (1) 1  
Balance at end of period 7 4 7 4
Impaired Stage three [member]        
Disclosure of financial assets [line items]        
Balance at beginning of period (43) (40) (45) (41)
Provision for credit losses        
Changes in risk, parameters and exposures (1) (4) (4) (8)
Exchange rate and other (1) 1 4 6
Balance at end of period $ (45) $ (43) $ (45) $ (43)