v3.26.1
Securities - Summary of Credit Risk Exposure by Internal Risk Rating (Detail) - CAD ($)
$ in Millions
Jul. 31, 2026
Oct. 31, 2025
Disclosure of credit risk exposure [line items]    
Amortized cost $ 289,998 $ 241,789
Securities measured at fair value through other comprehensive income [member]    
Disclosure of credit risk exposure [line items]    
Investment grade 287,851 239,375
Non-investment grade 871 790
Impaired 122 134
Carrying amount of securities measured at FVOCI subject to impairment 288,844 240,299
Items not subject to impairment [1] 1,659 1,496
Carrying amount of securities measured at FVOCI 290,503 241,795
Securities measured at amortized cost [member]    
Disclosure of credit risk exposure [line items]    
Investment grade 102,154 99,673
Non-investment grade 1,312 1,267
Amount before allowance for credit losses 103,466 100,940
Allowance for credit losses 17 14
Amortized cost 103,449 100,926
Performing Stage one [member] | Securities measured at fair value through other comprehensive income [member]    
Disclosure of credit risk exposure [line items]    
Investment grade 287,851 239,375
Non-investment grade 867 786
Impaired 0  
Carrying amount of securities measured at FVOCI subject to impairment 288,718 240,161
Performing Stage one [member] | Securities measured at amortized cost [member]    
Disclosure of credit risk exposure [line items]    
Investment grade 102,154 99,673
Non-investment grade 1,197 1,098
Amount before allowance for credit losses 103,351 100,771
Allowance for credit losses 12 8
Amortized cost 103,339 100,763
Performing Stage two [member] | Securities measured at fair value through other comprehensive income [member]    
Disclosure of credit risk exposure [line items]    
Investment grade 0  
Non-investment grade 4 4
Impaired 0  
Carrying amount of securities measured at FVOCI subject to impairment 4 4
Performing Stage two [member] | Securities measured at amortized cost [member]    
Disclosure of credit risk exposure [line items]    
Investment grade 0  
Non-investment grade 115 169
Amount before allowance for credit losses 115 169
Allowance for credit losses 5 6
Amortized cost 110 163
Impaired Stage three [member] | Securities measured at fair value through other comprehensive income [member]    
Disclosure of credit risk exposure [line items]    
Investment grade 0  
Non-investment grade 0  
Impaired [2] 122 134
Carrying amount of securities measured at FVOCI subject to impairment [2] 122 $ 134
Impaired Stage three [member] | Securities measured at amortized cost [member]    
Disclosure of credit risk exposure [line items]    
Investment grade 0  
Non-investment grade 0  
Amount before allowance for credit losses 0  
Allowance for credit losses 0  
Amortized cost $ 0  
[1] Investment securities at FVOCI not subject to impairment represent equity securities designated as FVOCI.
[2] Reflects $0 million of purchased credit-impaired securities (October 31, 2025 – $134 million).