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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 | Oct. 31, 2025 | Oct. 31, 2024
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Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | $ 552,198 | $ 499,897
Encumbered liquid assets | 290,034 | 234,751
Unencumbered liquid assets | 262,164 | 265,146
Cash and deposits with banks [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 44,003 | 48,064
Encumbered liquid assets | 285 | 560
Unencumbered liquid assets | 43,718 | 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 | 308,087 | 286,823
Encumbered liquid assets | 167,774 | 146,992
Unencumbered liquid assets | 140,313 | 139,831
Other debt securities [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 21,948 | 17,421
Encumbered liquid assets | 11,065 | 3,696
Unencumbered liquid assets | 10,883 | 13,725
Equities [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 116,967 | 91,526
Encumbered liquid assets | 76,927 | 54,269
Unencumbered liquid assets | 40,040 | 37,257
Canadian government guaranteed National Housing Act mortgage-backed securities [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 35,743 | 37,193
Encumbered liquid assets | 23,275 | 20,263
Unencumbered liquid assets | 12,468 | 16,930
Other liquid assets [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 25,450 | 18,870
Encumbered liquid assets | 10,708 | 8,971
Unencumbered liquid assets | 14,742 | 9,899
Bank owned liquid assets [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 365,181 | 341,759
Bank owned liquid assets [member] | Cash and deposits with banks [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 44,003 | 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 | 188,603 | 178,324
Bank owned liquid assets [member] | Other debt securities [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 7,273 | 6,093
Bank owned liquid assets [member] | Equities [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 72,778 | 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 | 31,690 | 35,155
Bank owned liquid assets [member] | Other liquid assets [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 20,834 | 16,021
Securities received as collateral [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 187,017 | 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 | 119,484 | 108,499
Securities received as collateral [member] | Other debt securities [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 14,675 | 11,328
Securities received as collateral [member] | Equities [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | 44,189 | 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 | 4,053 | 2,038
Securities received as collateral [member] | Other liquid assets [member] |  |
Disclosure Of Encumbered and Unencumbered Assets [line items] |  |
Total liquid assets | $ 4,616 | $ 2,849

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