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Financial Instruments - Risk Management - Summary of Credit Risk Exposures (Detail) - CAD ($) $ in Millions | Oct. 31, 2025 | Oct. 31, 2024
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Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total | [1],[2] |  | $ 1,305,445
Revised Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Drawn | [1],[2],[3] | $ 952,601 |
Undrawn commitments | [1],[2] | 231,693 |
Other exposures | [1],[2],[4] | 172,034 |
Total | [1],[2] | 1,356,328 |
Canada [member] | Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total | [1],[2] |  | 783,178
Canada [member] | Revised Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Drawn | [1],[2],[3] | 587,309 |
Undrawn commitments | [1],[2] | 175,314 |
Other exposures | [1],[2],[4] | 49,503 |
Total | [1],[2] | 812,126 |
United States [member] | Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total | [1],[2] |  | 238,201
United States [member] | Revised Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Drawn | [1],[2],[3] | 137,005 |
Undrawn commitments | [1],[2] | 31,646 |
Other exposures | [1],[2],[4] | 83,209 |
Total | [1],[2] | 251,860 |
Chile [member] | Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total | [1],[2] |  | 60,179
Chile [member] | Revised Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Drawn | [1],[2],[3] | 54,340 |
Undrawn commitments | [1],[2] | 4,645 |
Other exposures | [1],[2],[4] | 3,588 |
Total | [1],[2] | 62,573 |
Mexico [member] | Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total | [1],[2] |  | 58,439
Mexico [member] | Revised Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Drawn | [1],[2],[3] | 52,283 |
Undrawn commitments | [1],[2] | 3,901 |
Other exposures | [1],[2],[4] | 3,183 |
Total | [1],[2] | 59,367 |
Peru [member] | Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total | [1],[2] |  | 32,609
Peru [member] | Revised Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Drawn | [1],[2],[3] | 29,386 |
Undrawn commitments | [1],[2] | 2,187 |
Other exposures | [1],[2],[4] | 2,194 |
Total | [1],[2] | 33,767 |
Colombia [member] | Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total | [1],[2] |  | 15,015
Colombia [member] | Revised Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Drawn | [1],[2],[3] | 15,435 |
Undrawn commitments | [1],[2] | 1,777 |
Other exposures | [1],[2],[4] | 941 |
Total | [1],[2] | 18,153 |
Europe [member] | Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total | [1],[2] |  | 38,776
Europe [member] | Revised Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Drawn | [1],[2],[3] | 17,423 |
Undrawn commitments | [1],[2] | 6,241 |
Other exposures | [1],[2],[4] | 22,195 |
Total | [1],[2] | 45,859 |
Caribbean [member] | Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total | [1],[2] |  | 36,170
Caribbean [member] | Revised Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Drawn | [1],[2],[3] | 32,841 |
Undrawn commitments | [1],[2] | 2,152 |
Other exposures | [1],[2],[4] | 1,250 |
Total | [1],[2] | 36,243 |
Latin America (other) [member] | Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total | [1],[2] |  | 17,742
Latin America (other) [member] | Revised Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Drawn | [1],[2],[3] | 15,218 |
Undrawn commitments | [1],[2] | 948 |
Other exposures | [1],[2],[4] | 1,080 |
Total | [1],[2] | 17,246 |
All other countries [member] | Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total | [1],[2] |  | 25,136
All other countries [member] | Revised Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Drawn | [1],[2],[3] | 11,361 |
Undrawn commitments | [1],[2] | 2,882 |
Other exposures | [1],[2],[4] | 4,891 |
Total | [1],[2] | 19,134 |
Non retail [member] | Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total | [1] |  | 766,014
Non retail [member] | Revised Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Drawn | [1],[3] | 518,634 |
Undrawn commitments | [1] | 92,574 |
Other exposures | [1],[4] | 171,958 |
Total | [1] | 783,166 |
Non retail [member] | IRB portfolio [member] | Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total | [1] |  | 673,106
Non retail [member] | IRB portfolio [member] | Revised Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Drawn | [1],[3] | 443,258 |
Undrawn commitments | [1] | 87,081 |
Other exposures | [1],[4] | 147,788 |
Total | [1] | 678,127 |
Non retail [member] | IRB portfolio [member] | Corporate segment [Member] | Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total | [1] |  | 357,600
Non retail [member] | IRB portfolio [member] | Corporate segment [Member] | Revised Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Drawn | [1],[3] | 189,918 |
Undrawn commitments | [1] | 71,341 |
Other exposures | [1],[4] | 113,508 |
Total | [1] | 374,767 |
Non retail [member] | IRB portfolio [member] | Bank [member] | Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total | [1] |  | 56,648
Non retail [member] | IRB portfolio [member] | Bank [member] | Revised Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Drawn | [1],[3] | 12,924 |
Undrawn commitments | [1] | 12,253 |
Other exposures | [1],[4] | 23,194 |
Total | [1] | 48,371 |
Non retail [member] | IRB portfolio [member] | Sovereign [member] | Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total | [1] |  | 258,858
Non retail [member] | IRB portfolio [member] | Sovereign [member] | Revised Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Drawn | [1],[3] | 240,416 |
Undrawn commitments | [1] | 3,487 |
Other exposures | [1],[4] | 11,086 |
Total | [1] | 254,989 |
Non retail [member] | Standardized portfolio [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total |  | 105,000 | 93,000
Non retail [member] | Standardized portfolio [Member] | Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total | [1] |  | 92,908
Non retail [member] | Standardized portfolio [Member] | Revised Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Drawn | [1],[3] | 75,376 |
Undrawn commitments | [1] | 5,493 |
Other exposures | [1],[4] | 24,170 |
Total | [1] | 105,039 |
Non retail [member] | Standardized portfolio [Member] | Corporate segment [Member] | Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total | [1] |  | 65,375
Non retail [member] | Standardized portfolio [Member] | Corporate segment [Member] | Revised Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Drawn | [1],[3] | 49,395 |
Undrawn commitments | [1] | 4,901 |
Other exposures | [1],[4] | 23,786 |
Total | [1] | 78,082 |
Non retail [member] | Standardized portfolio [Member] | Bank [member] | Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total | [1] |  | 3,213
Non retail [member] | Standardized portfolio [Member] | Bank [member] | Revised Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Drawn | [1],[3] | 1,609 |
Undrawn commitments | [1] | 69 |
Other exposures | [1],[4] | 141 |
Total | [1] | 1,819 |
Non retail [member] | Standardized portfolio [Member] | Sovereign [member] | Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total | [1] |  | 24,320
Non retail [member] | Standardized portfolio [Member] | Sovereign [member] | Revised Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Drawn | [1],[3] | 24,372 |
Undrawn commitments | [1] | 523 |
Other exposures | [1],[4] | 243 |
Total | [1] | 25,138 |
Retail [member] | Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total | [1] |  | 539,431
Retail [member] | Revised Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Drawn | [1],[3] | 433,967 |
Undrawn commitments | [1] | 139,119 |
Other exposures | [1],[4] | 76 |
Total | [1] | 573,162 |
Retail [member] | IRB portfolio [member] | Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total | [1],[5] |  | 412,645
Retail [member] | IRB portfolio [member] | Revised Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Drawn | [1],[3] | 314,236 |
Undrawn commitments | [1] | 128,704 |
Total | [1],[5] | 442,940 |
Retail [member] | IRB portfolio [member] | Real estate secured [member] | Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total | [1] |  | 306,395
Retail [member] | IRB portfolio [member] | Real estate secured [member] | Revised Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Drawn | [1],[3] | 267,856 |
Undrawn commitments | [1] | 60,485 |
Total | [1] | 328,341 |
Retail [member] | IRB portfolio [member] | Qualifying revolving [member] | Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total | [1] |  | 67,585
Retail [member] | IRB portfolio [member] | Qualifying revolving [member] | Revised Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Drawn | [1],[3] | 18,710 |
Undrawn commitments | [1] | 63,595 |
Total | [1],[5] | 82,305 |
Retail [member] | IRB portfolio [member] | Other retail [member] | Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total | [1] |  | 38,665
Retail [member] | IRB portfolio [member] | Other retail [member] | Revised Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Drawn | [1],[3] | 27,670 |
Undrawn commitments | [1] | 4,624 |
Total | [1],[5] | 32,294 |
Retail [member] | Standardized portfolio [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total |  | 130,000 | 127,000
Retail [member] | Standardized portfolio [Member] | Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total | [1] |  | 126,786
Retail [member] | Standardized portfolio [Member] | Revised Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Drawn | [1],[3] | 119,731 |
Undrawn commitments | [1] | 10,415 |
Other exposures | [1],[4] | 76 |
Total | [1] | 130,222 |
Retail [member] | Standardized portfolio [Member] | Real estate secured [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total |  | 67,000 | 64,000
Retail [member] | Standardized portfolio [Member] | Real estate secured [member] | Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total | [1] |  | 63,572
Retail [member] | Standardized portfolio [Member] | Real estate secured [member] | Revised Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Drawn | [1],[3] | 67,179 |
Undrawn commitments | [1] | 102 |
Total | [1] | 67,281 |
Retail [member] | Standardized portfolio [Member] | Other retail [member] | Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total | [1] |  | $ 63,214
Retail [member] | Standardized portfolio [Member] | Other retail [member] | Revised Basel Three Norms [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Drawn | [1],[3] | 52,552 |
Undrawn commitments | [1] | 10,313 |
Other exposures | [1],[4] | 76 |
Total | [1] | $ 62,941 |
[1] | Exposure at default is presented after credit risk mitigation. Exposures exclude equity securities and other assets. Portfolios under the Standardized Approach are reported net of specific allowances for credit losses and net of collateral amounts treated under the Comprehensive Approach.
[2] | Geographic segmentation is based upon the location of the ultimate risk of the credit exposure.
[3] | Non-retail drawn includes loans, acceptances, deposits with financial institutions and FVOCI debt securities. Retail drawn includes residential mortgages, credit cards, lines of credit, other personal loans and small business treated as other regulatory retail.
[4] | Other exposures include off-balance sheet lending instruments such as letters of credit, letters of guarantees, securitizations, derivatives and repo-style transactions (reverse repurchase agreements, repurchase agreements, securities lending and securities borrowing), net of related collateral.
[5] | After credit risk mitigation.

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