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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 | Jan. 31, 2025 | Oct. 31, 2024
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Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | $ 545,114 | $ 499,897
Encumbered liquid assets | 287,668 | 234,751
Unencumbered liquid assets | 257,446 | 265,146
Cash and deposits with banks [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 47,811 | 48,064
Encumbered liquid assets | 593 | 560
Unencumbered liquid assets | 47,218 | 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 | 314,334 | 286,823
Encumbered liquid assets | 178,768 | 146,992
Unencumbered liquid assets | 135,566 | 139,831
Other debt securities [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 19,898 | 17,421
Encumbered liquid assets | 4,351 | 3,696
Unencumbered liquid assets | 15,547 | 13,725
Equities [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 103,090 | 91,526
Encumbered liquid assets | 69,700 | 54,269
Unencumbered liquid assets | 33,390 | 37,257
Canadian government guaranteed National Housing Act mortgage-backed securities [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 36,955 | 37,193
Encumbered liquid assets | 23,107 | 20,263
Unencumbered liquid assets | 13,848 | 16,930
Other liquid assets [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 23,026 | 18,870
Encumbered liquid assets | 11,149 | 8,971
Unencumbered liquid assets | 11,877 | 9,899
Bank owned liquid assets [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 361,712 | 341,759
Bank owned liquid assets [member] | Cash and deposits with banks [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 47,811 | 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 | 186,503 | 178,324
Bank owned liquid assets [member] | Other debt securities [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 6,373 | 6,093
Bank owned liquid assets [member] | Equities [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 67,475 | 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 | 34,198 | 35,155
Bank owned liquid assets [member] | Other liquid assets [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 19,352 | 16,021
Securities received as collateral [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 183,402 | 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 | 127,831 | 108,499
Securities received as collateral [member] | Other debt securities [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 13,525 | 11,328
Securities received as collateral [member] | Equities [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 35,615 | 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 | 2,757 | 2,038
Securities received as collateral [member] | Other liquid assets [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | $ 3,674 | $ 2,849

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