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Financial instruments - disclosures - Schedule of Balance Sheet Exposure Credit Risk under Different Basel Approaches (Detail) - CAD ($) $ in Millions | Oct. 31, 2025 | Oct. 31, 2024
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Disclosure of detailed information about financial instruments [line items] |  |
Cash and deposits with banks | $ 44,003 |
Securities | 283,235 | $ 254,345
Cash collateral on securities borrowed | 21,697 | 17,028
Securities purchased under resale agreements | 86,695 | 83,721
Loans | 593,896 |
Allowance for credit losses | (4,392) | (3,917)
Derivative instruments | 38,352 | 36,435
Other assets | 53,452 |
Total credit exposures | 1,116,938 | 1,041,985
Subject to credit risk [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Cash and deposits with banks | 44,003 |
Securities | 159,839 |
Cash collateral on securities borrowed | 21,697 |
Securities purchased under resale agreements | 69,044 |
Loans | 591,037 |
Allowance for credit losses | (4,392) |
Derivative instruments | 38,352 |
Other assets | 36,856 |
Total credit exposures | 956,436 | 899,752
Subject to credit risk [member] | IRB approach [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Cash and deposits with banks | 38,725 |
Securities | 150,549 |
Cash collateral on securities borrowed | 21,694 |
Securities purchased under resale agreements | 66,181 |
Loans | 548,529 |
Allowance for credit losses | (4,085) |
Derivative instruments | 38,352 |
Other assets | 25,125 |
Total credit exposures | 885,070 | 839,643
Subject to credit risk [member] | Standardized approach [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Cash and deposits with banks | 2,864 |
Securities | 5,594 |
Cash collateral on securities borrowed | 3 |
Loans | 16,267 |
Allowance for credit losses | (307) |
Other assets | 1,832 |
Total credit exposures | 26,253 | 24,493
Subject to credit risk [member] | Other credit risk [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Cash and deposits with banks | 2,414 |
Loans | 1,155 |
Other assets | 9,769 |
Total credit exposures | 13,338 | 12,107
Subject to credit risk [member] | Securitization Approach [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Securities | 3,696 |
Securities purchased under resale agreements | 2,863 |
Loans | 25,086 |
Other assets | 130 |
Total credit exposures | 31,775 | 23,509
Not subject to credit risk [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Securities | 123,396 |
Securities purchased under resale agreements | 17,651 |
Loans | 2,859 |
Other assets | 16,596 |
Total credit exposures | $ 160,502 | $ 142,233

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