v3.26.1
Loans and Allowance for Credit Losses - Summary of Gross Carrying Amount of Loans Measured at Amortized Cost - Undrawn Loan Commitments Wholesale (Detail) - Wholesale [member] - Undrawn loan commitments [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 $ 584,729 $ 594,569
Investment grade [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 389,835 394,760
Non investment grade [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 193,224 198,381
Not rated [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 1,670 1,428
Stage one exposure [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 569,014 576,797
Stage one exposure [member] | Investment grade [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 388,395 393,167
Stage one exposure [member] | Non investment grade [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 178,968 182,223
Stage one exposure [member] | Not rated [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 1,651 1,407
Stage two exposure [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 15,715 17,772
Stage two exposure [member] | Investment grade [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 1,440 1,593
Stage two exposure [member] | Non investment grade [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 14,256 16,158
Stage two exposure [member] | Not rated [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 19 $ 21
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] | Investment grade [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 0  
Stage three exposure [Member] | Non investment grade [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