v3.22.2.2
Securities - Summary of Credit Risk Exposure by Internal Risk Rating (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2022
Oct. 31, 2021
Disclosure of credit risk exposure [line items]    
Amortized cost $ 95,630 $ 78,180
Securities measured at fair value through other comprehensive income [member]    
Disclosure of credit risk exposure [line items]    
Investment grade 91,233 77,229
Non-investment grade 680 423
Impaired 150 150
Carrying amount of securities measured at FVOCI subject to impairment 92,063 77,802
Items not subject to impairment 828 533
Carrying amount of securities measured at FVOCI 92,891 78,335
Securities measured at amortized cost [member]    
Disclosure of credit risk exposure [line items]    
Investment grade 76,035 66,033
Non-investment grade 1,114 1,139
Amount before allowance for credit losses 77,149 67,172
Allowance for credit losses 22 23
Amortized cost 77,127 67,149
Performing Stage one [member] | Securities measured at fair value through other comprehensive income [member]    
Disclosure of credit risk exposure [line items]    
Investment grade 91,177 77,147
Non-investment grade 680 423
Carrying amount of securities measured at FVOCI subject to impairment 91,857 77,570
Performing Stage one [member] | Securities measured at amortized cost [member]    
Disclosure of credit risk exposure [line items]    
Investment grade 76,035 66,033
Non-investment grade 898 928
Amount before allowance for credit losses 76,933 66,961
Allowance for credit losses 8 5
Amortized cost 76,925 66,956
Performing Stage two [member] | Securities measured at fair value through other comprehensive income [member]    
Disclosure of credit risk exposure [line items]    
Investment grade 56 82
Carrying amount of securities measured at FVOCI subject to impairment 56 82
Performing Stage two [member] | Securities measured at amortized cost [member]    
Disclosure of credit risk exposure [line items]    
Non-investment grade 216 211
Amount before allowance for credit losses 216 211
Allowance for credit losses 14 18
Amortized cost 202 193
Impaired Stage three [member] | Securities measured at fair value through other comprehensive income [member]    
Disclosure of credit risk exposure [line items]    
Impaired 150 150
Carrying amount of securities measured at FVOCI subject to impairment $ 150 $ 150