v3.26.1
Loans and Allowance for Credit Losses - Summary of Gross Carrying Amount of Loans Measured at Amortized Cost - Credit Cards (Detail) - Credit cards [member] - Retail loans [member] - CAD ($)
$ in Millions
Apr. 30, 2026
Oct. 31, 2025
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment $ 27,702 $ 26,789
Low risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 20,446 18,440
Medium risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 3,376 4,414
High risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 2,861 2,493
Not rated [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 1,019 1,442
Stage one loan [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 21,979 21,605
Stage one loan [member] | Low risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 19,633 18,279
Stage one loan [member] | Medium risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 1,479 2,123
Stage one loan [member] | High risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 87 70
Stage one loan [member] | Not rated [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 780 1,133
Stage two loan [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 5,723 5,184
Stage two loan [member] | Low risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 813 161
Stage two loan [member] | Medium risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 1,897 2,291
Stage two loan [member] | High risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 2,774 2,423
Stage two loan [member] | Not rated [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 239 $ 309
Stage three loan [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 0  
Stage three loan [member] | Low risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 0  
Stage three loan [member] | Medium risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 0  
Stage three loan [member] | High risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 0  
Stage three loan [member] | Not rated [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment $ 0