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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 | Jul. 31, 2025 | Oct. 31, 2024
--- | --- | ---
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | $ 542,623 | $ 499,897
Encumbered liquid assets | 293,037 | 234,751
Unencumbered liquid assets | 249,586 | 265,146
Cash and deposits with banks [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 55,187 | 48,064
Encumbered liquid assets | 282 | 560
Unencumbered liquid assets | 54,905 | 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 | 302,289 | 286,823
Encumbered liquid assets | 187,527 | 146,992
Unencumbered liquid assets | 114,762 | 139,831
Other debt securities [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 20,185 | 17,421
Encumbered liquid assets | 9,103 | 3,696
Unencumbered liquid assets | 11,082 | 13,725
Equities [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 106,501 | 91,526
Encumbered liquid assets | 65,016 | 54,269
Unencumbered liquid assets | 41,485 | 37,257
Canadian government guaranteed National Housing Act mortgage-backed securities [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 35,107 | 37,193
Encumbered liquid assets | 22,990 | 20,263
Unencumbered liquid assets | 12,117 | 16,930
Other liquid assets [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 23,354 | 18,870
Encumbered liquid assets | 8,119 | 8,971
Unencumbered liquid assets | 15,235 | 9,899
Bank owned liquid assets [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 366,621 | 341,759
Bank owned liquid assets [member] | Cash and deposits with banks [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 55,187 | 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 | 184,041 | 178,324
Bank owned liquid assets [member] | Other debt securities [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 6,934 | 6,093
Bank owned liquid assets [member] | Equities [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 70,459 | 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 | 31,334 | 35,155
Bank owned liquid assets [member] | Other liquid assets [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 18,666 | 16,021
Securities received as collateral [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 176,002 | 158,138
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 | 118,248 | 108,499
Securities received as collateral [member] | Other debt securities [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 13,251 | 11,328
Securities received as collateral [member] | Equities [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 36,042 | 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 | 3,773 | 2,038
Securities received as collateral [member] | Other liquid assets [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | $ 4,688 | $ 2,849

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