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Commitments, Guarantees, Pledged Assets, Provisions and Contingent Liabilities - Summary of Pledged Assets collateral and Activities (Detail) - CAD ($) $ in Millions | Oct. 31, 2025 | Oct. 31, 2024
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Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items] |  |  |
Pledged assets and collateral |  | $ 430,416 | $ 371,350
Bank assets [member] |  |  |
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items] |  |  |
Pledged assets and collateral |  | 245,657 | 221,366
Bank assets [member] | Cash and due from banks [member] |  |  |
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items] |  |  |
Pledged assets and collateral |  | 108 | 80
Bank assets [member] | Securities [member] |  |  |
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items] |  |  |
Pledged assets and collateral | [1] | 174,514 | 139,553
Bank assets [member] | Loans [member] |  |  |
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items] |  |  |
Pledged assets and collateral |  | 59,886 | 71,419
Bank assets [member] | Other assets [member] |  |  |
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items] |  |  |
Pledged assets and collateral |  | 11,149 | 10,314
Third-party Assets [member] |  |  |
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items] |  |  |
Collateral received and available for sale or re-pledging | [2] | 232,840 | 195,071
Less: Collateral not sold or re-pledged | [2] | (48,081) | (45,087)
Pledged assets and collateral | [2] | 184,759 | 149,984
Clearing systems, payment systems and depositories [member] |  |  |
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items] |  |  |
Pledged assets and collateral |  | 18,136 | 26,203
Foreign governments and central banks [member] |  |  |
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items] |  |  |
Pledged assets and collateral |  | 38 | 46
Obligations related to securities sold short [member] |  |  |
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items] |  |  |
Pledged assets and collateral |  | 54,876 | 35,030
Obligations related to securities sold under repurchase agreements [member] |  |  |
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items] |  |  |
Pledged assets and collateral |  | 119,956 | 97,878
Securities borrowing and lending [member] |  |  |
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items] |  |  |
Pledged assets and collateral | [3] | 122,729 | 99,405
Derivative transactions [member] |  |  |
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items] |  |  |
Pledged assets and collateral |  | 21,870 | 19,224
Securitization [member] |  |  |
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items] |  |  |
Pledged assets and collateral |  | 21,873 | 23,739
Covered bonds [member] |  |  |
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items] |  |  |
Pledged assets and collateral |  | 23,125 | 27,235
Other [member] |  |  |
Disclosure commitments guarantees pledged assets provisions and contingent liabilities [line items] |  |  |
Pledged assets and collateral | [4] | $ 47,813 | $ 42,590
[1] | Includes NHA MBS of $6,690 million, which are included in loans in our Consolidated Balance Sheet ($5,492 million as at October 31, 2024).
[2] | Includes on-balance sheet securities borrowed or purchased under resale agreements and off-balance sheet collateral received.
[3] | Includes off-balance sheet securities borrowing and lending.
[4] | Includes $16,734 million of assets that have been pledged to support Federal Home Loan Bank activity ($21,235 million as at October 31, 2024).

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