v3.24.3
Securities - Summary of Allowance for Credit Losses - Securities at Amortized Cost (Detail) - Debt securities at amortized cost [member] - CAD ($)
$ in Millions
12 Months Ended
Oct. 31, 2024
Oct. 31, 2023
Disclosure of credit risk exposure [line items]    
Balance at beginning of period $ 23 $ 22
Provision for credit losses    
Purchases 7 10
Sales and maturities (2) (1)
Changes in risk, parameters and exposures (14) (9)
Exchange rate and other   1
Balance at end of period 14 23
Performing Stage one [member]    
Disclosure of credit risk exposure [line items]    
Balance at beginning of period 8 8
Provision for credit losses    
Purchases 7 10
Sales and maturities (2) (1)
Changes in risk, parameters and exposures (8) (9)
Exchange rate and other 1  
Balance at end of period 6 8
Performing Stage two [member]    
Disclosure of credit risk exposure [line items]    
Balance at beginning of period 15 14
Provision for credit losses    
Changes in risk, parameters and exposures (6)  
Exchange rate and other (1) 1
Balance at end of period $ 8 $ 15