v3.26.1
Loans and Allowance for Credit Losses - Summary of Gross Carrying Amount of Loans Measured at Amortized Cost - Undrawn Loan Commitments Retail (Detail) - Undrawn loan commitments - retail [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 $ 334,230 $ 325,679
Low risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 307,668 297,000
Medium risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 14,235 12,878
High risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 2,960 1,563
Not rated [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 9,367 14,238
Stage one exposure [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 331,836 320,520
Stage one exposure [member] | Low risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 307,529 293,300
Stage one exposure [member] | Medium risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 14,009 12,451
Stage one exposure [member] | High risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 1,175 805
Stage one exposure [member] | Not rated [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 9,123 13,964
Stage two exposure [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 2,394 5,159
Stage two exposure [member] | Low risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 139 3,700
Stage two exposure [member] | Medium risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 226 427
Stage two exposure [member] | High risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 1,785 758
Stage two exposure [member] | Not rated [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 244 $ 274
Stage three exposure [Member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 0  
Stage three exposure [Member] | Low risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 0  
Stage three exposure [Member] | Medium risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 0  
Stage three exposure [Member] | High risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 0  
Stage three exposure [Member] | Not rated [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment $ 0