v3.22.2.2
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
Oct. 31, 2022
Oct. 31, 2021
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment $ 264,957 $ 245,944
Low risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 248,661 230,090
Medium risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 9,267 9,608
High risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 1,243 1,302
Not rated [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 5,786 4,944
Stage one exposure [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 263,185 245,050
Stage one exposure [member] | Low risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 247,620 229,516
Stage one exposure [member] | Medium risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 9,021 9,475
Stage one exposure [member] | High risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 876 1,205
Stage one exposure [member] | Not rated [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 5,668 4,854
Stage two exposure [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 1,772 894
Stage two exposure [member] | Low risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 1,041 574
Stage two exposure [member] | Medium risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 246 133
Stage two exposure [member] | High risk [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment 367 97
Stage two exposure [member] | Not rated [member]    
Disclosure of credit risk exposure [line items]    
Gross carrying amount of financial assets subject to impairment $ 118 $ 90