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IFRS 7 - Disclosure - Liquidity Risk - Summary of Encumbered and Unencumbered Assets from On- and Off-Balance Sheet Sources (Detail) - CAD ($) $ in Millions | Apr. 30, 2025 | Oct. 31, 2024
--- | --- | ---
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | $ 536,339 | $ 499,897
Encumbered liquid assets | 278,314 | 234,751
Unencumbered liquid assets | 258,025 | 265,146
Cash and deposits with banks [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 49,586 | 48,064
Encumbered liquid assets | 482 | 560
Unencumbered liquid assets | 49,104 | 47,504
Securities issued or guaranteed by sovereigns, central banks, and multilateral development banks [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 306,406 | 286,823
Encumbered liquid assets | 179,119 | 146,992
Unencumbered liquid assets | 127,287 | 139,831
Other debt securities [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 19,881 | 17,421
Encumbered liquid assets | 5,863 | 3,696
Unencumbered liquid assets | 14,018 | 13,725
Equities [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 95,015 | 91,526
Encumbered liquid assets | 59,146 | 54,269
Unencumbered liquid assets | 35,869 | 37,257
Canadian government guaranteed National Housing Act mortgage-backed securities [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 37,695 | 37,193
Encumbered liquid assets | 23,557 | 20,263
Unencumbered liquid assets | 14,138 | 16,930
Other liquid assets [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 27,756 | 18,870
Encumbered liquid assets | 10,147 | 8,971
Unencumbered liquid assets | 17,609 | 9,899
Bank owned liquid assets [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 360,720 | 341,759
Bank owned liquid assets [member] | Cash and deposits with banks [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 49,586 | 48,064
Bank owned liquid assets [member] | Securities issued or guaranteed by sovereigns, central banks, and multilateral development banks [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 186,105 | 178,324
Bank owned liquid assets [member] | Other debt securities [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 5,947 | 6,093
Bank owned liquid assets [member] | Equities [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 64,770 | 58,102
Bank owned liquid assets [member] | Canadian government guaranteed National Housing Act mortgage-backed securities [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 32,431 | 35,155
Bank owned liquid assets [member] | Other liquid assets [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 21,881 | 16,021
Securities received as collateral [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 175,619 | 158,138
Securities received as collateral [member] | Cash and deposits with banks [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 0 |
Securities received as collateral [member] | Securities issued or guaranteed by sovereigns, central banks, and multilateral development banks [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 120,301 | 108,499
Securities received as collateral [member] | Other debt securities [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 13,934 | 11,328
Securities received as collateral [member] | Equities [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 30,245 | 33,424
Securities received as collateral [member] | Canadian government guaranteed National Housing Act mortgage-backed securities [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 5,264 | 2,038
Securities received as collateral [member] | Other liquid assets [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | $ 5,875 | $ 2,849

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