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Financial Instruments - Risk Management - Summary of Risk Categories of Borrower Internal Grades (Detail)
$ in Millions
Oct. 31, 2025
CAD ($)
Oct. 31, 2024
CAD ($)
Investment grade [member] | Equivalent external rating standard and poors AA to A plus [member]    
Disclosure of internal credit grades [line items]    
Internal grade rating [1] 95  
Investment grade [member] | Equivalent external rating standard and poors-A to-A minus [member]    
Disclosure of internal credit grades [line items]    
Internal grade rating [1] 90  
Investment grade [member] | Equivalent external rating standard and poors BBB plus [member]    
Disclosure of internal credit grades [line items]    
Internal grade rating [1] 87  
Investment grade [member] | Equivalent external rating standard and poors BBB [member]    
Disclosure of internal credit grades [line items]    
Internal grade rating [1] 85  
Investment grade [member] | Equivalent external rating standard and poors BBB minus[member]    
Disclosure of internal credit grades [line items]    
Internal grade rating [1] 83  
Non investment grade [member] | Equivalent external rating standard and poors BB plus [member]    
Disclosure of internal credit grades [line items]    
Internal grade rating [1] 80  
Non investment grade [member] | Equivalent external rating standard and poors BB [member]    
Disclosure of internal credit grades [line items]    
Internal grade rating [1] 77  
Non investment grade [member] | Equivalent external rating standard and poors BB minus [member]    
Disclosure of internal credit grades [line items]    
Internal grade rating [1] 75  
Non investment grade [member] | Equivalent external rating standard and poors-B plus [member]    
Disclosure of internal credit grades [line items]    
Internal grade rating [1] 73  
Non investment grade [member] | Equivalent external rating standard and poors-B to-B minus [member]    
Disclosure of internal credit grades [line items]    
Internal grade rating [1] 70  
Watch list [member]    
Disclosure of internal credit grades [line items]    
Internal grade rating [1] 30  
Watch list [member] | Equivalent external rating standard and poors CCC plus [member]    
Disclosure of internal credit grades [line items]    
Internal grade rating [1] 65  
Watch list [member] | Equivalent external rating standard and poors CCC [member]    
Disclosure of internal credit grades [line items]    
Internal grade rating [1] 60  
Watch list [member] | Equivalent external rating standard and poors CCC- to CC [Member]    
Disclosure of internal credit grades [line items]    
Internal grade rating [1] 40  
Default [member]    
Disclosure of internal credit grades [line items]    
Internal grade rating [1] 21  
Non retail [member] | IRB portfolio [member] | Revised Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Credit risk exposure at default drawn [2] $ 443,258  
Credit risk exposure at default undrawn commitments [2] 87,081  
Credit risk exposure at default other exposure [2],[3] 147,788  
Credit risk exposure default amount [2] 678,127  
Non retail [member] | IRB portfolio [member] | Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Credit risk exposure default amount [2]   $ 673,106
Non retail [member] | IRB portfolio [member] | Excluding residential mortgages [member] | Revised Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Credit risk exposure at default drawn [2] 392,413  
Credit risk exposure at default undrawn commitments [2] 87,081  
Credit risk exposure at default other exposure [2],[3] 147,788  
Credit risk exposure default amount [2] 627,282  
Non retail [member] | IRB portfolio [member] | Excluding residential mortgages [member] | Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Credit risk exposure default amount [2]   619,787
Non retail [member] | IRB portfolio [member] | Government guaranteed residential mortgages [Member] | Revised Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Credit risk exposure at default drawn [2],[4] 50,845  
Credit risk exposure default amount [2],[4] 50,845  
Non retail [member] | IRB portfolio [member] | Government guaranteed residential mortgages [Member] | Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Credit risk exposure default amount [2],[4]   53,319
Non retail [member] | IRB portfolio [member] | Investment grade [member] | Equivalent external rating standard and poors AAA to AA plus [member] | Revised Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Credit risk exposure at default drawn [2] 144,086  
Credit risk exposure at default undrawn commitments [2] 1,557  
Credit risk exposure at default other exposure [2],[3] 39,788  
Credit risk exposure default amount [2] $ 185,431  
Non retail [member] | IRB portfolio [member] | Investment grade [member] | Equivalent external rating standard and poors AAA to AA plus [member] | Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Credit risk exposure default amount [2]   174,122
Non retail [member] | IRB portfolio [member] | Investment grade [member] | Equivalent external rating standard and poors AA to A plus [member] | Revised Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Internal grade rating [2] 95  
Credit risk exposure at default drawn [2] $ 36,203  
Credit risk exposure at default undrawn commitments [2] 13,422  
Credit risk exposure at default other exposure [2],[3] 30,882  
Credit risk exposure default amount [2] $ 80,507  
Non retail [member] | IRB portfolio [member] | Investment grade [member] | Equivalent external rating standard and poors AA to A plus [member] | Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Credit risk exposure default amount [2]   71,282
Non retail [member] | IRB portfolio [member] | Investment grade [member] | Equivalent external rating standard and poors-A to-A minus [member] | Revised Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Internal grade rating [2] 90  
Credit risk exposure at default drawn [2] $ 15,314  
Credit risk exposure at default undrawn commitments [2] 12,067  
Credit risk exposure at default other exposure [2],[3] 28,875  
Credit risk exposure default amount [2] $ 56,256  
Non retail [member] | IRB portfolio [member] | Investment grade [member] | Equivalent external rating standard and poors-A to-A minus [member] | Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Credit risk exposure default amount [2]   49,596
Non retail [member] | IRB portfolio [member] | Investment grade [member] | Equivalent external rating standard and poors BBB plus [member] | Revised Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Internal grade rating [2] 87  
Credit risk exposure at default drawn [2] $ 26,472  
Credit risk exposure at default undrawn commitments [2] 13,771  
Credit risk exposure at default other exposure [2],[3] 16,458  
Credit risk exposure default amount [2] $ 56,701  
Non retail [member] | IRB portfolio [member] | Investment grade [member] | Equivalent external rating standard and poors BBB plus [member] | Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Credit risk exposure default amount [2]   63,699
Non retail [member] | IRB portfolio [member] | Investment grade [member] | Equivalent external rating standard and poors BBB [member] | Revised Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Internal grade rating [2] 85  
Credit risk exposure at default drawn [2] $ 25,166  
Credit risk exposure at default undrawn commitments [2] 10,987  
Credit risk exposure at default other exposure [2],[3] 8,758  
Credit risk exposure default amount [2] $ 44,911  
Non retail [member] | IRB portfolio [member] | Investment grade [member] | Equivalent external rating standard and poors BBB [member] | Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Credit risk exposure default amount [2]   49,980
Non retail [member] | IRB portfolio [member] | Investment grade [member] | Equivalent external rating standard and poors BBB minus[member] | Revised Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Internal grade rating [2] 83  
Credit risk exposure at default drawn [2] $ 43,384  
Credit risk exposure at default undrawn commitments [2] 11,155  
Credit risk exposure at default other exposure [2],[3] 5,924  
Credit risk exposure default amount [2] $ 60,463  
Non retail [member] | IRB portfolio [member] | Investment grade [member] | Equivalent external rating standard and poors BBB minus[member] | Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Credit risk exposure default amount [2]   69,342
Non retail [member] | IRB portfolio [member] | Non investment grade [member] | Equivalent external rating standard and poors BB plus [member] | Revised Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Internal grade rating [2] 80  
Credit risk exposure at default drawn [2] $ 39,476  
Credit risk exposure at default undrawn commitments [2] 10,262  
Credit risk exposure at default other exposure [2],[3] 5,810  
Credit risk exposure default amount [2] $ 55,548  
Non retail [member] | IRB portfolio [member] | Non investment grade [member] | Equivalent external rating standard and poors BB plus [member] | Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Credit risk exposure default amount [2]   54,770
Non retail [member] | IRB portfolio [member] | Non investment grade [member] | Equivalent external rating standard and poors BB [member] | Revised Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Internal grade rating [2] 77  
Credit risk exposure at default drawn [2] $ 25,637  
Credit risk exposure at default undrawn commitments [2] 6,542  
Credit risk exposure at default other exposure [2],[3] 4,824  
Credit risk exposure default amount [2] $ 37,003  
Non retail [member] | IRB portfolio [member] | Non investment grade [member] | Equivalent external rating standard and poors BB [member] | Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Credit risk exposure default amount [2]   40,729
Non retail [member] | IRB portfolio [member] | Non investment grade [member] | Equivalent external rating standard and poors BB minus [member] | Revised Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Internal grade rating [2] 75  
Credit risk exposure at default drawn [2] $ 20,174  
Credit risk exposure at default undrawn commitments [2] 4,373  
Credit risk exposure at default other exposure [2],[3] 4,556  
Credit risk exposure default amount [2] $ 29,103  
Non retail [member] | IRB portfolio [member] | Non investment grade [member] | Equivalent external rating standard and poors BB minus [member] | Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Credit risk exposure default amount [2]   27,324
Non retail [member] | IRB portfolio [member] | Non investment grade [member] | Equivalent external rating standard and poors-B plus [member] | Revised Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Internal grade rating [2] 73  
Credit risk exposure at default drawn [2] $ 7,913  
Credit risk exposure at default undrawn commitments [2] 1,464  
Credit risk exposure at default other exposure [2],[3] 756  
Credit risk exposure default amount [2] $ 10,133  
Non retail [member] | IRB portfolio [member] | Non investment grade [member] | Equivalent external rating standard and poors-B plus [member] | Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Credit risk exposure default amount [2]   10,140
Non retail [member] | IRB portfolio [member] | Non investment grade [member] | Equivalent external rating standard and poors-B to-B minus [member] | Revised Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Internal grade rating [2] 70  
Credit risk exposure at default drawn [2] $ 4,137  
Credit risk exposure at default undrawn commitments [2] 1,216  
Credit risk exposure at default other exposure [2],[3] 707  
Credit risk exposure default amount [2] $ 6,060  
Non retail [member] | IRB portfolio [member] | Non investment grade [member] | Equivalent external rating standard and poors-B to-B minus [member] | Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Credit risk exposure default amount [2]   3,791
Non retail [member] | IRB portfolio [member] | Watch list [member] | Equivalent external rating standard and poors CCC plus [member] | Revised Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Internal grade rating [2] 65  
Credit risk exposure at default drawn [2] $ 907  
Credit risk exposure at default undrawn commitments [2] 60  
Credit risk exposure at default other exposure [2],[3] 43  
Credit risk exposure default amount [2] $ 1,010  
Non retail [member] | IRB portfolio [member] | Watch list [member] | Equivalent external rating standard and poors CCC plus [member] | Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Credit risk exposure default amount [2]   1,592
Non retail [member] | IRB portfolio [member] | Watch list [member] | Equivalent external rating standard and poors CCC [member] | Revised Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Internal grade rating [2] 60  
Credit risk exposure at default drawn [2] $ 876  
Credit risk exposure at default undrawn commitments [2] 109  
Credit risk exposure at default other exposure [2],[3] 171  
Credit risk exposure default amount [2] $ 1,156  
Non retail [member] | IRB portfolio [member] | Watch list [member] | Equivalent external rating standard and poors CCC [member] | Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Credit risk exposure default amount [2]   986
Non retail [member] | IRB portfolio [member] | Watch list [member] | Equivalent external rating standard and poors CCC- to CC [Member] | Revised Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Internal grade rating [2] 40  
Credit risk exposure at default drawn [2] $ 910  
Credit risk exposure at default undrawn commitments [2] 75  
Credit risk exposure at default other exposure [2],[3] 134  
Credit risk exposure default amount [2] $ 1,119  
Non retail [member] | IRB portfolio [member] | Watch list [member] | Equivalent external rating standard and poors CCC- to CC [Member] | Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Credit risk exposure default amount [2]   889
Non retail [member] | IRB portfolio [member] | Watch list [member] | Equivalent external rating standard and poors default [member] | Revised Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Internal grade rating [2] 30  
Credit risk exposure at default drawn [2] $ 276  
Credit risk exposure at default undrawn commitments [2] 9  
Credit risk exposure at default other exposure [2],[3] 2  
Credit risk exposure default amount [2] $ 287  
Non retail [member] | IRB portfolio [member] | Watch list [member] | Equivalent external rating standard and poors default [member] | Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Credit risk exposure default amount [2]   232
Non retail [member] | IRB portfolio [member] | Default [member] | Revised Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Internal grade rating [2] 21  
Credit risk exposure at default drawn [2] $ 1,482  
Credit risk exposure at default undrawn commitments [2] 12  
Credit risk exposure at default other exposure [2],[3] 100  
Credit risk exposure default amount [2] $ 1,594  
Non retail [member] | IRB portfolio [member] | Default [member] | Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Credit risk exposure default amount [2]   $ 1,313
Top of range [member] | Investment grade [member] | Equivalent external rating standard and poors AAA to AA plus [member]    
Disclosure of internal credit grades [line items]    
Internal grade rating [1] 99  
Top of range [member] | Non retail [member] | IRB portfolio [member] | Investment grade [member] | Equivalent external rating standard and poors AAA to AA plus [member] | Revised Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Internal grade rating [2] 99  
Bottom of range [member] | Investment grade [member] | Equivalent external rating standard and poors AAA to AA plus [member]    
Disclosure of internal credit grades [line items]    
Internal grade rating [1] 98  
Bottom of range [member] | Non retail [member] | IRB portfolio [member] | Investment grade [member] | Equivalent external rating standard and poors AAA to AA plus [member] | Revised Basel Three Norms [Member]    
Disclosure of internal credit grades [line items]    
Internal grade rating [2] 98  
[1] Applies to non-retail portfolio.
[2] After credit risk mitigation.
[3] Includes off-balance sheet lending instruments such as letters of credit, letters of guarantees, securitizations, derivatives and repo-style transactions (reverse repurchase agreements, repurchase agreements and securities lending and borrowing), net of related collateral.
[4] These exposures are classified as sovereign exposures and are included in the non-retail category.