v3.26.1
Loans and Allowance for Credit Losses - Summary of Gross Carrying Amount of Loans Measured at Amortized Cost - Residential Mortgage (Detail) - Residential mortgages [member] - Retail loans [member] - CAD ($)
$ in Millions
Jul. 31, 2026
Oct. 31, 2025
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment $ 513,035 $ 492,285
Items not subject to impairment 1,382 1,128
Gross carrying amount of financial assets 514,417 493,413
Low risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 415,975 402,555
Medium risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 24,778 23,193
High risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 11,787 8,663
Not rated [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 58,307 56,193
Impaired [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 2,188 1,681
Stage one loan [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 494,236 463,066
Stage one loan [member] | Low risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 415,012 386,060
Stage one loan [member] | Medium risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 19,585 20,622
Stage one loan [member] | High risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 3,096 2,131
Stage one loan [member] | Not rated [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 56,543 54,253
Stage two loan [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 16,611 27,538
Stage two loan [member] | Low risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 963 16,495
Stage two loan [member] | Medium risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 5,193 2,571
Stage two loan [member] | High risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 8,691 6,532
Stage two loan [member] | Not rated [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 1,764 1,940
Stage three loan [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 2,188 1,681
Stage three loan [member] | Impaired [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment $ 2,188 $ 1,681