v3.22.4
Securities - Summary of Allowance for Losses measured at FVOCI (Detail) - CAD ($)
$ in Millions
 3 Months Ended
Jan. 31, 2023
Oct. 31, 2022
Jan. 31, 2022
Disclosure of financial assets [line items]      
Balance at beginning of period $ 3,276    
Balance at end of period 3,371 $ 3,276 $ 2,958
Debt securities measured at FVOCI [member]      
Disclosure of financial assets [line items]      
Balance at beginning of period 24 23 19
Provision for (reversal of) credit losses   (1) 3
Foreign exchange and other (1) 2 1
Balance at end of period 23 24 23
Stage 1 [member] | Debt securities measured at FVOCI [member] | Financial instruments performing [member] | 12-month expected credit losses [member]      
Disclosure of financial assets [line items]      
Balance at beginning of period 4 4 4
Balance at end of period 4 4 4
Stage 2 [member] | Debt securities measured at FVOCI [member] | Financial instruments performing [member] | Lifetime expected credit losses [member]      
Disclosure of financial assets [line items]      
Balance at beginning of period 20 19 15
Provision for (reversal of) credit losses   (1) 3
Foreign exchange and other (1) 2 1
Balance at end of period $ 19 $ 20 $ 19