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Financial Instruments - Risk Management - Summary of Risk Categories of Borrower Internal Grades (Detail) $ in Millions | Oct. 31, 2025 CAD ($) | Oct. 31, 2024 CAD ($)
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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.

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