v3.24.3
Securities - Summary of Allowance for Credit Losses - Securities at FVOCI (Detail) - Debt securities at fair value through other comprehensive income [member] - CAD ($)
$ in Millions
12 Months Ended
Oct. 31, 2024
Oct. 31, 2023
Disclosure of financial assets [line items]    
Balance at beginning of period $ (33) $ (19)
Provision for credit losses    
Purchases 10 7
Sales and maturities (4) (2)
Changes in risk, parameters and exposures (12) (22)
Exchange rate and other 4 3
Balance at end of period (35) (33)
Performing Stage one [member]    
Disclosure of financial assets [line items]    
Balance at beginning of period 4 3
Provision for credit losses    
Transfers to stage 1   1
Purchases 10 7
Sales and maturities (4) (2)
Changes in risk, parameters and exposures (4) (5)
Balance at end of period 6 4
Performing Stage two [member]    
Disclosure of financial assets [line items]    
Balance at beginning of period   1
Provision for credit losses    
Transfers to stage 1   (1)
Impaired Stage three [member]    
Disclosure of financial assets [line items]    
Balance at beginning of period (37) (23)
Provision for credit losses    
Changes in risk, parameters and exposures (8) (17)
Exchange rate and other 4 3
Balance at end of period $ (41) $ (37)