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Offsetting of Financial Assets and Financial Liabilities - Summary of Amounts Offset and Not Offset in the Consolidated Balance Sheet (Detail) - CAD ($) $ in Millions | Oct. 31, 2025 | Oct. 31, 2024
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Disclosure of offsetting of financial assets and financial liabilities [Line Items] |  |  |
Gross amounts (Financial Assets) |  | $ 215,850 | $ 182,944
Amounts offset in the balance sheet |  | 29,278 | 24,784
Net amounts presented in balance sheet |  | 186,572 | 158,160
Impact of master netting agreements |  | 50,153 | 37,314
Securities received as collateral | [1],[2] | 124,201 | 106,108
Cash collateral |  | 5,714 | 3,874
Net amount | [3] | 6,504 | 10,864
Gross amounts (Financial Liabilities) |  | 222,974 | 193,878
Amounts offset in the balance sheet |  | 29,278 | 24,784
Net amounts presented in balance sheet |  | 193,696 | 169,094
Impact of master netting agreements |  | 50,153 | 37,314
Securities pledged as collateral | [1],[2] | 130,183 | 115,132
Cash collateral |  | 7,739 | 7,636
Net amount | [3] | 5,621 | 9,012
Securities purchased under resale agreements and securities borrowed [member] |  |  |
Disclosure of offsetting of financial assets and financial liabilities [Line Items] |  |  |
Gross amounts (Financial Assets) |  | 158,361 | 135,282
Amounts offset in the balance sheet |  | 28,940 | 24,375
Net amounts presented in balance sheet |  | 129,421 | 110,907
Impact of master netting agreements |  | 6,899 | 5,738
Securities received as collateral | [1],[2] | 121,546 | 103,814
Cash collateral |  | 49 | 72
Net amount | [3] | 927 | 1,283
Derivative financial instruments assets 1 [member] |  |  |
Disclosure of offsetting of financial assets and financial liabilities [Line Items] |  |  |
Gross amounts (Financial Assets) |  | 57,489 | 47,662
Amounts offset in the balance sheet |  | 338 | 409
Net amounts presented in balance sheet |  | 57,151 | 47,253
Impact of master netting agreements |  | 43,254 | 31,576
Securities received as collateral | [1],[2] | 2,655 | 2,294
Cash collateral |  | 5,665 | 3,802
Net amount | [3] | 5,577 | 9,581
Derivative financial instruments liabilities 1 [member] |  |  |
Disclosure of offsetting of financial assets and financial liabilities [Line Items] |  |  |
Gross amounts (Financial Liabilities) |  | 59,067 | 58,712
Amounts offset in the balance sheet |  | 338 | 409
Net amounts presented in balance sheet |  | 58,729 | 58,303
Impact of master netting agreements |  | 43,254 | 31,576
Securities pledged as collateral | [1],[2] | 2,657 | 10,866
Cash collateral |  | 7,613 | 7,378
Net amount | [3] | 5,205 | 8,483
Obligations related to securities sold under repurchase agreements and securities lent [member] |  |  |
Disclosure of offsetting of financial assets and financial liabilities [Line Items] |  |  |
Gross amounts (Financial Liabilities) |  | 163,907 | 135,166
Amounts offset in the balance sheet |  | 28,940 | 24,375
Net amounts presented in balance sheet |  | 134,967 | 110,791
Impact of master netting agreements |  | 6,899 | 5,738
Securities pledged as collateral | [1],[2] | 127,526 | 104,266
Cash collateral |  | 126 | 258
Net amount | [3] | $ 416 | $ 529
[1] | Certain amounts of collateral are restricted from being sold or repledged except in the event of default or the occurrence of other predetermined events.
[2] | Financial assets received/pledged as collateral are disclosed at fair value and limited to the net balance sheet exposure (i.e. any over-collateralization is excluded from the table).
[3] | Not intended to represent our actual exposure to credit risk.

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